blob: 323a6160fd0a027280242c483042865ef3cfb786 [file] [log] [blame]
/*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the SQLite parser
** when syntax rules are reduced. The routines in this file handle the
** following kinds of SQL syntax:
**
** CREATE TABLE
** DROP TABLE
** CREATE INDEX
** DROP INDEX
** creating ID lists
** BEGIN TRANSACTION
** COMMIT
** ROLLBACK
*/
#include "sqliteInt.h"
#include "pager.h"
#include "btree.h"
/*
** This routine is called when a new SQL statement is beginning to
** be parsed. Initialize the pParse structure as needed.
*/
void sqlite3BeginParse(Parse *pParse, int explainFlag){
pParse->explain = (u8)explainFlag;
pParse->nVar = 0;
}
#ifndef SQLITE_OMIT_SHARED_CACHE
/*
** The TableLock structure is only used by the sqlite3TableLock() and
** codeTableLocks() functions.
*/
struct TableLock {
int iDb; /* The database containing the table to be locked */
int iTab; /* The root page of the table to be locked */
u8 isWriteLock; /* True for write lock. False for a read lock */
const char *zName; /* Name of the table */
};
/*
** Record the fact that we want to lock a table at run-time.
**
** The table to be locked has root page iTab and is found in database iDb.
** A read or a write lock can be taken depending on isWritelock.
**
** This routine just records the fact that the lock is desired. The
** code to make the lock occur is generated by a later call to
** codeTableLocks() which occurs during sqlite3FinishCoding().
*/
void sqlite3TableLock(
Parse *pParse, /* Parsing context */
int iDb, /* Index of the database containing the table to lock */
int iTab, /* Root page number of the table to be locked */
u8 isWriteLock, /* True for a write lock */
const char *zName /* Name of the table to be locked */
){
Parse *pToplevel = sqlite3ParseToplevel(pParse);
int i;
int nBytes;
TableLock *p;
assert( iDb>=0 );
for(i=0; i<pToplevel->nTableLock; i++){
p = &pToplevel->aTableLock[i];
if( p->iDb==iDb && p->iTab==iTab ){
p->isWriteLock = (p->isWriteLock || isWriteLock);
return;
}
}
nBytes = sizeof(TableLock) * (pToplevel->nTableLock+1);
pToplevel->aTableLock =
sqlite3DbReallocOrFree(pToplevel->db, pToplevel->aTableLock, nBytes);
if( pToplevel->aTableLock ){
p = &pToplevel->aTableLock[pToplevel->nTableLock++];
p->iDb = iDb;
p->iTab = iTab;
p->isWriteLock = isWriteLock;
p->zName = zName;
}else{
pToplevel->nTableLock = 0;
pToplevel->db->mallocFailed = 1;
}
}
/*
** Code an OP_TableLock instruction for each table locked by the
** statement (configured by calls to sqlite3TableLock()).
*/
static void codeTableLocks(Parse *pParse){
int i;
Vdbe *pVdbe;
pVdbe = sqlite3GetVdbe(pParse);
assert( pVdbe!=0 ); /* sqlite3GetVdbe cannot fail: VDBE already allocated */
for(i=0; i<pParse->nTableLock; i++){
TableLock *p = &pParse->aTableLock[i];
int p1 = p->iDb;
sqlite3VdbeAddOp4(pVdbe, OP_TableLock, p1, p->iTab, p->isWriteLock,
p->zName, P4_STATIC);
}
}
#else
#define codeTableLocks(x)
#endif
/*
** This routine is called after a single SQL statement has been
** parsed and a VDBE program to execute that statement has been
** prepared. This routine puts the finishing touches on the
** VDBE program and resets the pParse structure for the next
** parse.
**
** Note that if an error occurred, it might be the case that
** no VDBE code was generated.
*/
void sqlite3FinishCoding(Parse *pParse){
sqlite3 *db;
Vdbe *v;
db = pParse->db;
if( db->mallocFailed ) return;
if( pParse->nested ) return;
if( pParse->nErr ) return;
/* Begin by generating some termination code at the end of the
** vdbe program
*/
v = sqlite3GetVdbe(pParse);
assert( !pParse->isMultiWrite
|| sqlite3VdbeAssertMayAbort(v, pParse->mayAbort));
if( v ){
sqlite3VdbeAddOp0(v, OP_Halt);
/* The cookie mask contains one bit for each database file open.
** (Bit 0 is for main, bit 1 is for temp, and so forth.) Bits are
** set for each database that is used. Generate code to start a
** transaction on each used database and to verify the schema cookie
** on each used database.
*/
if( pParse->cookieGoto>0 ){
yDbMask mask;
int iDb;
sqlite3VdbeJumpHere(v, pParse->cookieGoto-1);
for(iDb=0, mask=1; iDb<db->nDb; mask<<=1, iDb++){
if( (mask & pParse->cookieMask)==0 ) continue;
sqlite3VdbeUsesBtree(v, iDb);
sqlite3VdbeAddOp2(v,OP_Transaction, iDb, (mask & pParse->writeMask)!=0);
if( db->init.busy==0 ){
assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
sqlite3VdbeAddOp3(v, OP_VerifyCookie,
iDb, pParse->cookieValue[iDb],
db->aDb[iDb].pSchema->iGeneration);
}
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
{
int i;
for(i=0; i<pParse->nVtabLock; i++){
char *vtab = (char *)sqlite3GetVTable(db, pParse->apVtabLock[i]);
sqlite3VdbeAddOp4(v, OP_VBegin, 0, 0, 0, vtab, P4_VTAB);
}
pParse->nVtabLock = 0;
}
#endif
/* Once all the cookies have been verified and transactions opened,
** obtain the required table-locks. This is a no-op unless the
** shared-cache feature is enabled.
*/
codeTableLocks(pParse);
/* Initialize any AUTOINCREMENT data structures required.
*/
sqlite3AutoincrementBegin(pParse);
/* Finally, jump back to the beginning of the executable code. */
sqlite3VdbeAddOp2(v, OP_Goto, 0, pParse->cookieGoto);
}
}
/* Get the VDBE program ready for execution
*/
if( v && ALWAYS(pParse->nErr==0) && !db->mallocFailed ){
#ifdef SQLITE_DEBUG
FILE *trace = (db->flags & SQLITE_VdbeTrace)!=0 ? stdout : 0;
sqlite3VdbeTrace(v, trace);
#endif
assert( pParse->iCacheLevel==0 ); /* Disables and re-enables match */
/* A minimum of one cursor is required if autoincrement is used
* See ticket [a696379c1f08866] */
if( pParse->pAinc!=0 && pParse->nTab==0 ) pParse->nTab = 1;
sqlite3VdbeMakeReady(v, pParse->nVar, pParse->nMem,
pParse->nTab, pParse->nMaxArg, pParse->explain,
pParse->isMultiWrite && pParse->mayAbort);
pParse->rc = SQLITE_DONE;
pParse->colNamesSet = 0;
}else{
pParse->rc = SQLITE_ERROR;
}
pParse->nTab = 0;
pParse->nMem = 0;
pParse->nSet = 0;
pParse->nVar = 0;
pParse->cookieMask = 0;
pParse->cookieGoto = 0;
}
/*
** Run the parser and code generator recursively in order to generate
** code for the SQL statement given onto the end of the pParse context
** currently under construction. When the parser is run recursively
** this way, the final OP_Halt is not appended and other initialization
** and finalization steps are omitted because those are handling by the
** outermost parser.
**
** Not everything is nestable. This facility is designed to permit
** INSERT, UPDATE, and DELETE operations against SQLITE_MASTER. Use
** care if you decide to try to use this routine for some other purposes.
*/
void sqlite3NestedParse(Parse *pParse, const char *zFormat, ...){
va_list ap;
char *zSql;
char *zErrMsg = 0;
sqlite3 *db = pParse->db;
# define SAVE_SZ (sizeof(Parse) - offsetof(Parse,nVar))
char saveBuf[SAVE_SZ];
if( pParse->nErr ) return;
assert( pParse->nested<10 ); /* Nesting should only be of limited depth */
va_start(ap, zFormat);
zSql = sqlite3VMPrintf(db, zFormat, ap);
va_end(ap);
if( zSql==0 ){
return; /* A malloc must have failed */
}
pParse->nested++;
memcpy(saveBuf, &pParse->nVar, SAVE_SZ);
memset(&pParse->nVar, 0, SAVE_SZ);
sqlite3RunParser(pParse, zSql, &zErrMsg);
sqlite3DbFree(db, zErrMsg);
sqlite3DbFree(db, zSql);
memcpy(&pParse->nVar, saveBuf, SAVE_SZ);
pParse->nested--;
}
/*
** Locate the in-memory structure that describes a particular database
** table given the name of that table and (optionally) the name of the
** database containing the table. Return NULL if not found.
**
** If zDatabase is 0, all databases are searched for the table and the
** first matching table is returned. (No checking for duplicate table
** names is done.) The search order is TEMP first, then MAIN, then any
** auxiliary databases added using the ATTACH command.
**
** See also sqlite3LocateTable().
*/
Table *sqlite3FindTable(sqlite3 *db, const char *zName, const char *zDatabase){
Table *p = 0;
int i;
int nName;
assert( zName!=0 );
nName = sqlite3Strlen30(zName);
/* All mutexes are required for schema access. Make sure we hold them. */
assert( zDatabase!=0 || sqlite3BtreeHoldsAllMutexes(db) );
for(i=OMIT_TEMPDB; i<db->nDb; i++){
int j = (i<2) ? i^1 : i; /* Search TEMP before MAIN */
if( zDatabase!=0 && sqlite3StrICmp(zDatabase, db->aDb[j].zName) ) continue;
assert( sqlite3SchemaMutexHeld(db, j, 0) );
p = sqlite3HashFind(&db->aDb[j].pSchema->tblHash, zName, nName);
if( p ) break;
}
return p;
}
/*
** Locate the in-memory structure that describes a particular database
** table given the name of that table and (optionally) the name of the
** database containing the table. Return NULL if not found. Also leave an
** error message in pParse->zErrMsg.
**
** The difference between this routine and sqlite3FindTable() is that this
** routine leaves an error message in pParse->zErrMsg where
** sqlite3FindTable() does not.
*/
Table *sqlite3LocateTable(
Parse *pParse, /* context in which to report errors */
int isView, /* True if looking for a VIEW rather than a TABLE */
const char *zName, /* Name of the table we are looking for */
const char *zDbase /* Name of the database. Might be NULL */
){
Table *p;
/* Read the database schema. If an error occurs, leave an error message
** and code in pParse and return NULL. */
if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){
return 0;
}
p = sqlite3FindTable(pParse->db, zName, zDbase);
if( p==0 ){
const char *zMsg = isView ? "no such view" : "no such table";
if( zDbase ){
sqlite3ErrorMsg(pParse, "%s: %s.%s", zMsg, zDbase, zName);
}else{
sqlite3ErrorMsg(pParse, "%s: %s", zMsg, zName);
}
pParse->checkSchema = 1;
}
return p;
}
/*
** Locate the in-memory structure that describes
** a particular index given the name of that index
** and the name of the database that contains the index.
** Return NULL if not found.
**
** If zDatabase is 0, all databases are searched for the
** table and the first matching index is returned. (No checking
** for duplicate index names is done.) The search order is
** TEMP first, then MAIN, then any auxiliary databases added
** using the ATTACH command.
*/
Index *sqlite3FindIndex(sqlite3 *db, const char *zName, const char *zDb){
Index *p = 0;
int i;
int nName = sqlite3Strlen30(zName);
/* All mutexes are required for schema access. Make sure we hold them. */
assert( zDb!=0 || sqlite3BtreeHoldsAllMutexes(db) );
for(i=OMIT_TEMPDB; i<db->nDb; i++){
int j = (i<2) ? i^1 : i; /* Search TEMP before MAIN */
Schema *pSchema = db->aDb[j].pSchema;
assert( pSchema );
if( zDb && sqlite3StrICmp(zDb, db->aDb[j].zName) ) continue;
assert( sqlite3SchemaMutexHeld(db, j, 0) );
p = sqlite3HashFind(&pSchema->idxHash, zName, nName);
if( p ) break;
}
return p;
}
/*
** Reclaim the memory used by an index
*/
static void freeIndex(sqlite3 *db, Index *p){
#ifndef SQLITE_OMIT_ANALYZE
sqlite3DeleteIndexSamples(db, p);
#endif
sqlite3DbFree(db, p->zColAff);
sqlite3DbFree(db, p);
}
/*
** For the index called zIdxName which is found in the database iDb,
** unlike that index from its Table then remove the index from
** the index hash table and free all memory structures associated
** with the index.
*/
void sqlite3UnlinkAndDeleteIndex(sqlite3 *db, int iDb, const char *zIdxName){
Index *pIndex;
int len;
Hash *pHash;
assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
pHash = &db->aDb[iDb].pSchema->idxHash;
len = sqlite3Strlen30(zIdxName);
pIndex = sqlite3HashInsert(pHash, zIdxName, len, 0);
if( ALWAYS(pIndex) ){
if( pIndex->pTable->pIndex==pIndex ){
pIndex->pTable->pIndex = pIndex->pNext;
}else{
Index *p;
/* Justification of ALWAYS(); The index must be on the list of
** indices. */
p = pIndex->pTable->pIndex;
while( ALWAYS(p) && p->pNext!=pIndex ){ p = p->pNext; }
if( ALWAYS(p && p->pNext==pIndex) ){
p->pNext = pIndex->pNext;
}
}
freeIndex(db, pIndex);
}
db->flags |= SQLITE_InternChanges;
}
/*
** Erase all schema information from the in-memory hash tables of
** a single database. This routine is called to reclaim memory
** before the database closes. It is also called during a rollback
** if there were schema changes during the transaction or if a
** schema-cookie mismatch occurs.
**
** If iDb<0 then reset the internal schema tables for all database
** files. If iDb>=0 then reset the internal schema for only the
** single file indicated.
*/
void sqlite3ResetInternalSchema(sqlite3 *db, int iDb){
int i, j;
assert( iDb<db->nDb );
if( iDb>=0 ){
/* Case 1: Reset the single schema identified by iDb */
Db *pDb = &db->aDb[iDb];
assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
assert( pDb->pSchema!=0 );
sqlite3SchemaClear(pDb->pSchema);
/* If any database other than TEMP is reset, then also reset TEMP
** since TEMP might be holding triggers that reference tables in the
** other database.
*/
if( iDb!=1 ){
pDb = &db->aDb[1];
assert( pDb->pSchema!=0 );
sqlite3SchemaClear(pDb->pSchema);
}
return;
}
/* Case 2 (from here to the end): Reset all schemas for all attached
** databases. */
assert( iDb<0 );
sqlite3BtreeEnterAll(db);
for(i=0; i<db->nDb; i++){
Db *pDb = &db->aDb[i];
if( pDb->pSchema ){
sqlite3SchemaClear(pDb->pSchema);
}
}
db->flags &= ~SQLITE_InternChanges;
sqlite3VtabUnlockList(db);
sqlite3BtreeLeaveAll(db);
/* If one or more of the auxiliary database files has been closed,
** then remove them from the auxiliary database list. We take the
** opportunity to do this here since we have just deleted all of the
** schema hash tables and therefore do not have to make any changes
** to any of those tables.
*/
for(i=j=2; i<db->nDb; i++){
struct Db *pDb = &db->aDb[i];
if( pDb->pBt==0 ){
sqlite3DbFree(db, pDb->zName);
pDb->zName = 0;
continue;
}
if( j<i ){
db->aDb[j] = db->aDb[i];
}
j++;
}
memset(&db->aDb[j], 0, (db->nDb-j)*sizeof(db->aDb[j]));
db->nDb = j;
if( db->nDb<=2 && db->aDb!=db->aDbStatic ){
memcpy(db->aDbStatic, db->aDb, 2*sizeof(db->aDb[0]));
sqlite3DbFree(db, db->aDb);
db->aDb = db->aDbStatic;
}
}
/*
** This routine is called when a commit occurs.
*/
void sqlite3CommitInternalChanges(sqlite3 *db){
db->flags &= ~SQLITE_InternChanges;
}
/*
** Delete memory allocated for the column names of a table or view (the
** Table.aCol[] array).
*/
static void sqliteDeleteColumnNames(sqlite3 *db, Table *pTable){
int i;
Column *pCol;
assert( pTable!=0 );
if( (pCol = pTable->aCol)!=0 ){
for(i=0; i<pTable->nCol; i++, pCol++){
sqlite3DbFree(db, pCol->zName);
sqlite3ExprDelete(db, pCol->pDflt);
sqlite3DbFree(db, pCol->zDflt);
sqlite3DbFree(db, pCol->zType);
sqlite3DbFree(db, pCol->zColl);
}
sqlite3DbFree(db, pTable->aCol);
}
}
/*
** Remove the memory data structures associated with the given
** Table. No changes are made to disk by this routine.
**
** This routine just deletes the data structure. It does not unlink
** the table data structure from the hash table. But it does destroy
** memory structures of the indices and foreign keys associated with
** the table.
*/
void sqlite3DeleteTable(sqlite3 *db, Table *pTable){
Index *pIndex, *pNext;
assert( !pTable || pTable->nRef>0 );
/* Do not delete the table until the reference count reaches zero. */
if( !pTable ) return;
if( ((!db || db->pnBytesFreed==0) && (--pTable->nRef)>0) ) return;
/* Delete all indices associated with this table. */
for(pIndex = pTable->pIndex; pIndex; pIndex=pNext){
pNext = pIndex->pNext;
assert( pIndex->pSchema==pTable->pSchema );
if( !db || db->pnBytesFreed==0 ){
char *zName = pIndex->zName;
TESTONLY ( Index *pOld = ) sqlite3HashInsert(
&pIndex->pSchema->idxHash, zName, sqlite3Strlen30(zName), 0
);
assert( db==0 || sqlite3SchemaMutexHeld(db, 0, pIndex->pSchema) );
assert( pOld==pIndex || pOld==0 );
}
freeIndex(db, pIndex);
}
/* Delete any foreign keys attached to this table. */
sqlite3FkDelete(db, pTable);
/* Delete the Table structure itself.
*/
sqliteDeleteColumnNames(db, pTable);
sqlite3DbFree(db, pTable->zName);
sqlite3DbFree(db, pTable->zColAff);
sqlite3SelectDelete(db, pTable->pSelect);
#ifndef SQLITE_OMIT_CHECK
sqlite3ExprDelete(db, pTable->pCheck);
#endif
#ifndef SQLITE_OMIT_VIRTUALTABLE
sqlite3VtabClear(db, pTable);
#endif
sqlite3DbFree(db, pTable);
}
/*
** Unlink the given table from the hash tables and the delete the
** table structure with all its indices and foreign keys.
*/
void sqlite3UnlinkAndDeleteTable(sqlite3 *db, int iDb, const char *zTabName){
Table *p;
Db *pDb;
assert( db!=0 );
assert( iDb>=0 && iDb<db->nDb );
assert( zTabName );
assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
testcase( zTabName[0]==0 ); /* Zero-length table names are allowed */
pDb = &db->aDb[iDb];
p = sqlite3HashInsert(&pDb->pSchema->tblHash, zTabName,
sqlite3Strlen30(zTabName),0);
sqlite3DeleteTable(db, p);
db->flags |= SQLITE_InternChanges;
}
/*
** Given a token, return a string that consists of the text of that
** token. Space to hold the returned string
** is obtained from sqliteMalloc() and must be freed by the calling
** function.
**
** Any quotation marks (ex: "name", 'name', [name], or `name`) that
** surround the body of the token are removed.
**
** Tokens are often just pointers into the original SQL text and so
** are not \000 terminated and are not persistent. The returned string
** is \000 terminated and is persistent.
*/
char *sqlite3NameFromToken(sqlite3 *db, Token *pName){
char *zName;
if( pName ){
zName = sqlite3DbStrNDup(db, (char*)pName->z, pName->n);
sqlite3Dequote(zName);
}else{
zName = 0;
}
return zName;
}
/*
** Open the sqlite_master table stored in database number iDb for
** writing. The table is opened using cursor 0.
*/
void sqlite3OpenMasterTable(Parse *p, int iDb){
Vdbe *v = sqlite3GetVdbe(p);
sqlite3TableLock(p, iDb, MASTER_ROOT, 1, SCHEMA_TABLE(iDb));
sqlite3VdbeAddOp3(v, OP_OpenWrite, 0, MASTER_ROOT, iDb);
sqlite3VdbeChangeP4(v, -1, (char *)5, P4_INT32); /* 5 column table */
if( p->nTab==0 ){
p->nTab = 1;
}
}
/*
** Parameter zName points to a nul-terminated buffer containing the name
** of a database ("main", "temp" or the name of an attached db). This
** function returns the index of the named database in db->aDb[], or
** -1 if the named db cannot be found.
*/
int sqlite3FindDbName(sqlite3 *db, const char *zName){
int i = -1; /* Database number */
if( zName ){
Db *pDb;
int n = sqlite3Strlen30(zName);
for(i=(db->nDb-1), pDb=&db->aDb[i]; i>=0; i--, pDb--){
if( (!OMIT_TEMPDB || i!=1 ) && n==sqlite3Strlen30(pDb->zName) &&
0==sqlite3StrICmp(pDb->zName, zName) ){
break;
}
}
}
return i;
}
/*
** The token *pName contains the name of a database (either "main" or
** "temp" or the name of an attached db). This routine returns the
** index of the named database in db->aDb[], or -1 if the named db
** does not exist.
*/
int sqlite3FindDb(sqlite3 *db, Token *pName){
int i; /* Database number */
char *zName; /* Name we are searching for */
zName = sqlite3NameFromToken(db, pName);
i = sqlite3FindDbName(db, zName);
sqlite3DbFree(db, zName);
return i;
}
/* The table or view or trigger name is passed to this routine via tokens
** pName1 and pName2. If the table name was fully qualified, for example:
**
** CREATE TABLE xxx.yyy (...);
**
** Then pName1 is set to "xxx" and pName2 "yyy". On the other hand if
** the table name is not fully qualified, i.e.:
**
** CREATE TABLE yyy(...);
**
** Then pName1 is set to "yyy" and pName2 is "".
**
** This routine sets the *ppUnqual pointer to point at the token (pName1 or
** pName2) that stores the unqualified table name. The index of the
** database "xxx" is returned.
*/
int sqlite3TwoPartName(
Parse *pParse, /* Parsing and code generating context */
Token *pName1, /* The "xxx" in the name "xxx.yyy" or "xxx" */
Token *pName2, /* The "yyy" in the name "xxx.yyy" */
Token **pUnqual /* Write the unqualified object name here */
){
int iDb; /* Database holding the object */
sqlite3 *db = pParse->db;
if( ALWAYS(pName2!=0) && pName2->n>0 ){
if( db->init.busy ) {
sqlite3ErrorMsg(pParse, "corrupt database");
pParse->nErr++;
return -1;
}
*pUnqual = pName2;
iDb = sqlite3FindDb(db, pName1);
if( iDb<0 ){
sqlite3ErrorMsg(pParse, "unknown database %T", pName1);
pParse->nErr++;
return -1;
}
}else{
assert( db->init.iDb==0 || db->init.busy );
iDb = db->init.iDb;
*pUnqual = pName1;
}
return iDb;
}
/*
** This routine is used to check if the UTF-8 string zName is a legal
** unqualified name for a new schema object (table, index, view or
** trigger). All names are legal except those that begin with the string
** "sqlite_" (in upper, lower or mixed case). This portion of the namespace
** is reserved for internal use.
*/
int sqlite3CheckObjectName(Parse *pParse, const char *zName){
if( !pParse->db->init.busy && pParse->nested==0
&& (pParse->db->flags & SQLITE_WriteSchema)==0
&& 0==sqlite3StrNICmp(zName, "sqlite_", 7) ){
sqlite3ErrorMsg(pParse, "object name reserved for internal use: %s", zName);
return SQLITE_ERROR;
}
return SQLITE_OK;
}
/*
** Begin constructing a new table representation in memory. This is
** the first of several action routines that get called in response
** to a CREATE TABLE statement. In particular, this routine is called
** after seeing tokens "CREATE" and "TABLE" and the table name. The isTemp
** flag is true if the table should be stored in the auxiliary database
** file instead of in the main database file. This is normally the case
** when the "TEMP" or "TEMPORARY" keyword occurs in between
** CREATE and TABLE.
**
** The new table record is initialized and put in pParse->pNewTable.
** As more of the CREATE TABLE statement is parsed, additional action
** routines will be called to add more information to this record.
** At the end of the CREATE TABLE statement, the sqlite3EndTable() routine
** is called to complete the construction of the new table record.
*/
void sqlite3StartTable(
Parse *pParse, /* Parser context */
Token *pName1, /* First part of the name of the table or view */
Token *pName2, /* Second part of the name of the table or view */
int isTemp, /* True if this is a TEMP table */
int isView, /* True if this is a VIEW */
int isVirtual, /* True if this is a VIRTUAL table */
int noErr /* Do nothing if table already exists */
){
Table *pTable;
char *zName = 0; /* The name of the new table */
sqlite3 *db = pParse->db;
Vdbe *v;
int iDb; /* Database number to create the table in */
Token *pName; /* Unqualified name of the table to create */
/* The table or view name to create is passed to this routine via tokens
** pName1 and pName2. If the table name was fully qualified, for example:
**
** CREATE TABLE xxx.yyy (...);
**
** Then pName1 is set to "xxx" and pName2 "yyy". On the other hand if
** the table name is not fully qualified, i.e.:
**
** CREATE TABLE yyy(...);
**
** Then pName1 is set to "yyy" and pName2 is "".
**
** The call below sets the pName pointer to point at the token (pName1 or
** pName2) that stores the unqualified table name. The variable iDb is
** set to the index of the database that the table or view is to be
** created in.
*/
iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pName);
if( iDb<0 ) return;
if( !OMIT_TEMPDB && isTemp && pName2->n>0 && iDb!=1 ){
/* If creating a temp table, the name may not be qualified. Unless
** the database name is "temp" anyway. */
sqlite3ErrorMsg(pParse, "temporary table name must be unqualified");
return;
}
if( !OMIT_TEMPDB && isTemp ) iDb = 1;
pParse->sNameToken = *pName;
zName = sqlite3NameFromToken(db, pName);
if( zName==0 ) return;
if( SQLITE_OK!=sqlite3CheckObjectName(pParse, zName) ){
goto begin_table_error;
}
if( db->init.iDb==1 ) isTemp = 1;
#ifndef SQLITE_OMIT_AUTHORIZATION
assert( (isTemp & 1)==isTemp );
{
int code;
char *zDb = db->aDb[iDb].zName;
if( sqlite3AuthCheck(pParse, SQLITE_INSERT, SCHEMA_TABLE(isTemp), 0, zDb) ){
goto begin_table_error;
}
if( isView ){
if( !OMIT_TEMPDB && isTemp ){
code = SQLITE_CREATE_TEMP_VIEW;
}else{
code = SQLITE_CREATE_VIEW;
}
}else{
if( !OMIT_TEMPDB && isTemp ){
code = SQLITE_CREATE_TEMP_TABLE;
}else{
code = SQLITE_CREATE_TABLE;
}
}
if( !isVirtual && sqlite3AuthCheck(pParse, code, zName, 0, zDb) ){
goto begin_table_error;
}
}
#endif
/* Make sure the new table name does not collide with an existing
** index or table name in the same database. Issue an error message if
** it does. The exception is if the statement being parsed was passed
** to an sqlite3_declare_vtab() call. In that case only the column names
** and types will be used, so there is no need to test for namespace
** collisions.
*/
if( !IN_DECLARE_VTAB ){
char *zDb = db->aDb[iDb].zName;
if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){
goto begin_table_error;
}
pTable = sqlite3FindTable(db, zName, zDb);
if( pTable ){
if( !noErr ){
sqlite3ErrorMsg(pParse, "table %T already exists", pName);
}else{
assert( !db->init.busy );
sqlite3CodeVerifySchema(pParse, iDb);
}
goto begin_table_error;
}
if( sqlite3FindIndex(db, zName, zDb)!=0 ){
sqlite3ErrorMsg(pParse, "there is already an index named %s", zName);
goto begin_table_error;
}
}
pTable = sqlite3DbMallocZero(db, sizeof(Table));
if( pTable==0 ){
db->mallocFailed = 1;
pParse->rc = SQLITE_NOMEM;
pParse->nErr++;
goto begin_table_error;
}
pTable->zName = zName;
pTable->iPKey = -1;
pTable->pSchema = db->aDb[iDb].pSchema;
pTable->nRef = 1;
pTable->nRowEst = 1000000;
assert( pParse->pNewTable==0 );
pParse->pNewTable = pTable;
/* If this is the magic sqlite_sequence table used by autoincrement,
** then record a pointer to this table in the main database structure
** so that INSERT can find the table easily.
*/
#ifndef SQLITE_OMIT_AUTOINCREMENT
if( !pParse->nested && strcmp(zName, "sqlite_sequence")==0 ){
assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
pTable->pSchema->pSeqTab = pTable;
}
#endif
/* Begin generating the code that will insert the table record into
** the SQLITE_MASTER table. Note in particular that we must go ahead
** and allocate the record number for the table entry now. Before any
** PRIMARY KEY or UNIQUE keywords are parsed. Those keywords will cause
** indices to be created and the table record must come before the
** indices. Hence, the record number for the table must be allocated
** now.
*/
if( !db->init.busy && (v = sqlite3GetVdbe(pParse))!=0 ){
int j1;
int fileFormat;
int reg1, reg2, reg3;
sqlite3BeginWriteOperation(pParse, 0, iDb);
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( isVirtual ){
sqlite3VdbeAddOp0(v, OP_VBegin);
}
#endif
/* If the file format and encoding in the database have not been set,
** set them now.
*/
reg1 = pParse->regRowid = ++pParse->nMem;
reg2 = pParse->regRoot = ++pParse->nMem;
reg3 = ++pParse->nMem;
sqlite3VdbeAddOp3(v, OP_ReadCookie, iDb, reg3, BTREE_FILE_FORMAT);
sqlite3VdbeUsesBtree(v, iDb);
j1 = sqlite3VdbeAddOp1(v, OP_If, reg3);
fileFormat = (db->flags & SQLITE_LegacyFileFmt)!=0 ?
1 : SQLITE_MAX_FILE_FORMAT;
sqlite3VdbeAddOp2(v, OP_Integer, fileFormat, reg3);
sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_FILE_FORMAT, reg3);
sqlite3VdbeAddOp2(v, OP_Integer, ENC(db), reg3);
sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_TEXT_ENCODING, reg3);
sqlite3VdbeJumpHere(v, j1);
/* This just creates a place-holder record in the sqlite_master table.
** The record created does not contain anything yet. It will be replaced
** by the real entry in code generated at sqlite3EndTable().
**
** The rowid for the new entry is left in register pParse->regRowid.
** The root page number of the new table is left in reg pParse->regRoot.
** The rowid and root page number values are needed by the code that
** sqlite3EndTable will generate.
*/
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE)
if( isView || isVirtual ){
sqlite3VdbeAddOp2(v, OP_Integer, 0, reg2);
}else
#endif
{
sqlite3VdbeAddOp2(v, OP_CreateTable, iDb, reg2);
}
sqlite3OpenMasterTable(pParse, iDb);
sqlite3VdbeAddOp2(v, OP_NewRowid, 0, reg1);
sqlite3VdbeAddOp2(v, OP_Null, 0, reg3);
sqlite3VdbeAddOp3(v, OP_Insert, 0, reg3, reg1);
sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
sqlite3VdbeAddOp0(v, OP_Close);
}
/* Normal (non-error) return. */
return;
/* If an error occurs, we jump here */
begin_table_error:
sqlite3DbFree(db, zName);
return;
}
/*
** This macro is used to compare two strings in a case-insensitive manner.
** It is slightly faster than calling sqlite3StrICmp() directly, but
** produces larger code.
**
** WARNING: This macro is not compatible with the strcmp() family. It
** returns true if the two strings are equal, otherwise false.
*/
#define STRICMP(x, y) (\
sqlite3UpperToLower[*(unsigned char *)(x)]== \
sqlite3UpperToLower[*(unsigned char *)(y)] \
&& sqlite3StrICmp((x)+1,(y)+1)==0 )
/*
** Add a new column to the table currently being constructed.
**
** The parser calls this routine once for each column declaration
** in a CREATE TABLE statement. sqlite3StartTable() gets called
** first to get things going. Then this routine is called for each
** column.
*/
void sqlite3AddColumn(Parse *pParse, Token *pName){
Table *p;
int i;
char *z;
Column *pCol;
sqlite3 *db = pParse->db;
if( (p = pParse->pNewTable)==0 ) return;
#if SQLITE_MAX_COLUMN
if( p->nCol+1>db->aLimit[SQLITE_LIMIT_COLUMN] ){
sqlite3ErrorMsg(pParse, "too many columns on %s", p->zName);
return;
}
#endif
z = sqlite3NameFromToken(db, pName);
if( z==0 ) return;
for(i=0; i<p->nCol; i++){
if( STRICMP(z, p->aCol[i].zName) ){
sqlite3ErrorMsg(pParse, "duplicate column name: %s", z);
sqlite3DbFree(db, z);
return;
}
}
if( (p->nCol & 0x7)==0 ){
Column *aNew;
aNew = sqlite3DbRealloc(db,p->aCol,(p->nCol+8)*sizeof(p->aCol[0]));
if( aNew==0 ){
sqlite3DbFree(db, z);
return;
}
p->aCol = aNew;
}
pCol = &p->aCol[p->nCol];
memset(pCol, 0, sizeof(p->aCol[0]));
pCol->zName = z;
/* If there is no type specified, columns have the default affinity
** 'NONE'. If there is a type specified, then sqlite3AddColumnType() will
** be called next to set pCol->affinity correctly.
*/
pCol->affinity = SQLITE_AFF_NONE;
p->nCol++;
}
/*
** This routine is called by the parser while in the middle of
** parsing a CREATE TABLE statement. A "NOT NULL" constraint has
** been seen on a column. This routine sets the notNull flag on
** the column currently under construction.
*/
void sqlite3AddNotNull(Parse *pParse, int onError){
Table *p;
p = pParse->pNewTable;
if( p==0 || NEVER(p->nCol<1) ) return;
p->aCol[p->nCol-1].notNull = (u8)onError;
}
/*
** Scan the column type name zType (length nType) and return the
** associated affinity type.
**
** This routine does a case-independent search of zType for the
** substrings in the following table. If one of the substrings is
** found, the corresponding affinity is returned. If zType contains
** more than one of the substrings, entries toward the top of
** the table take priority. For example, if zType is 'BLOBINT',
** SQLITE_AFF_INTEGER is returned.
**
** Substring | Affinity
** --------------------------------
** 'INT' | SQLITE_AFF_INTEGER
** 'CHAR' | SQLITE_AFF_TEXT
** 'CLOB' | SQLITE_AFF_TEXT
** 'TEXT' | SQLITE_AFF_TEXT
** 'BLOB' | SQLITE_AFF_NONE
** 'REAL' | SQLITE_AFF_REAL
** 'FLOA' | SQLITE_AFF_REAL
** 'DOUB' | SQLITE_AFF_REAL
**
** If none of the substrings in the above table are found,
** SQLITE_AFF_NUMERIC is returned.
*/
char sqlite3AffinityType(const char *zIn){
u32 h = 0;
char aff = SQLITE_AFF_NUMERIC;
if( zIn ) while( zIn[0] ){
h = (h<<8) + sqlite3UpperToLower[(*zIn)&0xff];
zIn++;
if( h==(('c'<<24)+('h'<<16)+('a'<<8)+'r') ){ /* CHAR */
aff = SQLITE_AFF_TEXT;
}else if( h==(('c'<<24)+('l'<<16)+('o'<<8)+'b') ){ /* CLOB */
aff = SQLITE_AFF_TEXT;
}else if( h==(('t'<<24)+('e'<<16)+('x'<<8)+'t') ){ /* TEXT */
aff = SQLITE_AFF_TEXT;
}else if( h==(('b'<<24)+('l'<<16)+('o'<<8)+'b') /* BLOB */
&& (aff==SQLITE_AFF_NUMERIC || aff==SQLITE_AFF_REAL) ){
aff = SQLITE_AFF_NONE;
#ifndef SQLITE_OMIT_FLOATING_POINT
}else if( h==(('r'<<24)+('e'<<16)+('a'<<8)+'l') /* REAL */
&& aff==SQLITE_AFF_NUMERIC ){
aff = SQLITE_AFF_REAL;
}else if( h==(('f'<<24)+('l'<<16)+('o'<<8)+'a') /* FLOA */
&& aff==SQLITE_AFF_NUMERIC ){
aff = SQLITE_AFF_REAL;
}else if( h==(('d'<<24)+('o'<<16)+('u'<<8)+'b') /* DOUB */
&& aff==SQLITE_AFF_NUMERIC ){
aff = SQLITE_AFF_REAL;
#endif
}else if( (h&0x00FFFFFF)==(('i'<<16)+('n'<<8)+'t') ){ /* INT */
aff = SQLITE_AFF_INTEGER;
break;
}
}
return aff;
}
/*
** This routine is called by the parser while in the middle of
** parsing a CREATE TABLE statement. The pFirst token is the first
** token in the sequence of tokens that describe the type of the
** column currently under construction. pLast is the last token
** in the sequence. Use this information to construct a string
** that contains the typename of the column and store that string
** in zType.
*/
void sqlite3AddColumnType(Parse *pParse, Token *pType){
Table *p;
Column *pCol;
p = pParse->pNewTable;
if( p==0 || NEVER(p->nCol<1) ) return;
pCol = &p->aCol[p->nCol-1];
assert( pCol->zType==0 );
pCol->zType = sqlite3NameFromToken(pParse->db, pType);
pCol->affinity = sqlite3AffinityType(pCol->zType);
}
/*
** The expression is the default value for the most recently added column
** of the table currently under construction.
**
** Default value expressions must be constant. Raise an exception if this
** is not the case.
**
** This routine is called by the parser while in the middle of
** parsing a CREATE TABLE statement.
*/
void sqlite3AddDefaultValue(Parse *pParse, ExprSpan *pSpan){
Table *p;
Column *pCol;
sqlite3 *db = pParse->db;
p = pParse->pNewTable;
if( p!=0 ){
pCol = &(p->aCol[p->nCol-1]);
if( !sqlite3ExprIsConstantOrFunction(pSpan->pExpr) ){
sqlite3ErrorMsg(pParse, "default value of column [%s] is not constant",
pCol->zName);
}else{
/* A copy of pExpr is used instead of the original, as pExpr contains
** tokens that point to volatile memory. The 'span' of the expression
** is required by pragma table_info.
*/
sqlite3ExprDelete(db, pCol->pDflt);
pCol->pDflt = sqlite3ExprDup(db, pSpan->pExpr, EXPRDUP_REDUCE);
sqlite3DbFree(db, pCol->zDflt);
pCol->zDflt = sqlite3DbStrNDup(db, (char*)pSpan->zStart,
(int)(pSpan->zEnd - pSpan->zStart));
}
}
sqlite3ExprDelete(db, pSpan->pExpr);
}
/*
** Designate the PRIMARY KEY for the table. pList is a list of names
** of columns that form the primary key. If pList is NULL, then the
** most recently added column of the table is the primary key.
**
** A table can have at most one primary key. If the table already has
** a primary key (and this is the second primary key) then create an
** error.
**
** If the PRIMARY KEY is on a single column whose datatype is INTEGER,
** then we will try to use that column as the rowid. Set the Table.iPKey
** field of the table under construction to be the index of the
** INTEGER PRIMARY KEY column. Table.iPKey is set to -1 if there is
** no INTEGER PRIMARY KEY.
**
** If the key is not an INTEGER PRIMARY KEY, then create a unique
** index for the key. No index is created for INTEGER PRIMARY KEYs.
*/
void sqlite3AddPrimaryKey(
Parse *pParse, /* Parsing context */
ExprList *pList, /* List of field names to be indexed */
int onError, /* What to do with a uniqueness conflict */
int autoInc, /* True if the AUTOINCREMENT keyword is present */
int sortOrder /* SQLITE_SO_ASC or SQLITE_SO_DESC */
){
Table *pTab = pParse->pNewTable;
char *zType = 0;
int iCol = -1, i;
if( pTab==0 || IN_DECLARE_VTAB ) goto primary_key_exit;
if( pTab->tabFlags & TF_HasPrimaryKey ){
sqlite3ErrorMsg(pParse,
"table \"%s\" has more than one primary key", pTab->zName);
goto primary_key_exit;
}
pTab->tabFlags |= TF_HasPrimaryKey;
if( pList==0 ){
iCol = pTab->nCol - 1;
pTab->aCol[iCol].isPrimKey = 1;
}else{
for(i=0; i<pList->nExpr; i++){
for(iCol=0; iCol<pTab->nCol; iCol++){
if( sqlite3StrICmp(pList->a[i].zName, pTab->aCol[iCol].zName)==0 ){
break;
}
}
if( iCol<pTab->nCol ){
pTab->aCol[iCol].isPrimKey = 1;
}
}
if( pList->nExpr>1 ) iCol = -1;
}
if( iCol>=0 && iCol<pTab->nCol ){
zType = pTab->aCol[iCol].zType;
}
if( zType && sqlite3StrICmp(zType, "INTEGER")==0
&& sortOrder==SQLITE_SO_ASC ){
pTab->iPKey = iCol;
pTab->keyConf = (u8)onError;
assert( autoInc==0 || autoInc==1 );
pTab->tabFlags |= autoInc*TF_Autoincrement;
}else if( autoInc ){
#ifndef SQLITE_OMIT_AUTOINCREMENT
sqlite3ErrorMsg(pParse, "AUTOINCREMENT is only allowed on an "
"INTEGER PRIMARY KEY");
#endif
}else{
Index *p;
p = sqlite3CreateIndex(pParse, 0, 0, 0, pList, onError, 0, 0, sortOrder, 0);
if( p ){
p->autoIndex = 2;
}
pList = 0;
}
primary_key_exit:
sqlite3ExprListDelete(pParse->db, pList);
return;
}
/*
** Add a new CHECK constraint to the table currently under construction.
*/
void sqlite3AddCheckConstraint(
Parse *pParse, /* Parsing context */
Expr *pCheckExpr /* The check expression */
){
sqlite3 *db = pParse->db;
#ifndef SQLITE_OMIT_CHECK
Table *pTab = pParse->pNewTable;
if( pTab && !IN_DECLARE_VTAB ){
pTab->pCheck = sqlite3ExprAnd(db, pTab->pCheck, pCheckExpr);
}else
#endif
{
sqlite3ExprDelete(db, pCheckExpr);
}
}
/*
** Set the collation function of the most recently parsed table column
** to the CollSeq given.
*/
void sqlite3AddCollateType(Parse *pParse, Token *pToken){
Table *p;
int i;
char *zColl; /* Dequoted name of collation sequence */
sqlite3 *db;
if( (p = pParse->pNewTable)==0 ) return;
i = p->nCol-1;
db = pParse->db;
zColl = sqlite3NameFromToken(db, pToken);
if( !zColl ) return;
if( sqlite3LocateCollSeq(pParse, zColl) ){
Index *pIdx;
p->aCol[i].zColl = zColl;
/* If the column is declared as "<name> PRIMARY KEY COLLATE <type>",
** then an index may have been created on this column before the
** collation type was added. Correct this if it is the case.
*/
for(pIdx=p->pIndex; pIdx; pIdx=pIdx->pNext){
assert( pIdx->nColumn==1 );
if( pIdx->aiColumn[0]==i ){
pIdx->azColl[0] = p->aCol[i].zColl;
}
}
}else{
sqlite3DbFree(db, zColl);
}
}
/*
** This function returns the collation sequence for database native text
** encoding identified by the string zName, length nName.
**
** If the requested collation sequence is not available, or not available
** in the database native encoding, the collation factory is invoked to
** request it. If the collation factory does not supply such a sequence,
** and the sequence is available in another text encoding, then that is
** returned instead.
**
** If no versions of the requested collations sequence are available, or
** another error occurs, NULL is returned and an error message written into
** pParse.
**
** This routine is a wrapper around sqlite3FindCollSeq(). This routine
** invokes the collation factory if the named collation cannot be found
** and generates an error message.
**
** See also: sqlite3FindCollSeq(), sqlite3GetCollSeq()
*/
CollSeq *sqlite3LocateCollSeq(Parse *pParse, const char *zName){
sqlite3 *db = pParse->db;
u8 enc = ENC(db);
u8 initbusy = db->init.busy;
CollSeq *pColl;
pColl = sqlite3FindCollSeq(db, enc, zName, initbusy);
if( !initbusy && (!pColl || !pColl->xCmp) ){
pColl = sqlite3GetCollSeq(db, enc, pColl, zName);
if( !pColl ){
sqlite3ErrorMsg(pParse, "no such collation sequence: %s", zName);
}
}
return pColl;
}
/*
** Generate code that will increment the schema cookie.
**
** The schema cookie is used to determine when the schema for the
** database changes. After each schema change, the cookie value
** changes. When a process first reads the schema it records the
** cookie. Thereafter, whenever it goes to access the database,
** it checks the cookie to make sure the schema has not changed
** since it was last read.
**
** This plan is not completely bullet-proof. It is possible for
** the schema to change multiple times and for the cookie to be
** set back to prior value. But schema changes are infrequent
** and the probability of hitting the same cookie value is only
** 1 chance in 2^32. So we're safe enough.
*/
void sqlite3ChangeCookie(Parse *pParse, int iDb){
int r1 = sqlite3GetTempReg(pParse);
sqlite3 *db = pParse->db;
Vdbe *v = pParse->pVdbe;
assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
sqlite3VdbeAddOp2(v, OP_Integer, db->aDb[iDb].pSchema->schema_cookie+1, r1);
sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_SCHEMA_VERSION, r1);
sqlite3ReleaseTempReg(pParse, r1);
}
/*
** Measure the number of characters needed to output the given
** identifier. The number returned includes any quotes used
** but does not include the null terminator.
**
** The estimate is conservative. It might be larger that what is
** really needed.
*/
static int identLength(const char *z){
int n;
for(n=0; *z; n++, z++){
if( *z=='"' ){ n++; }
}
return n + 2;
}
/*
** The first parameter is a pointer to an output buffer. The second
** parameter is a pointer to an integer that contains the offset at
** which to write into the output buffer. This function copies the
** nul-terminated string pointed to by the third parameter, zSignedIdent,
** to the specified offset in the buffer and updates *pIdx to refer
** to the first byte after the last byte written before returning.
**
** If the string zSignedIdent consists entirely of alpha-numeric
** characters, does not begin with a digit and is not an SQL keyword,
** then it is copied to the output buffer exactly as it is. Otherwise,
** it is quoted using double-quotes.
*/
static void identPut(char *z, int *pIdx, char *zSignedIdent){
unsigned char *zIdent = (unsigned char*)zSignedIdent;
int i, j, needQuote;
i = *pIdx;
for(j=0; zIdent[j]; j++){
if( !sqlite3Isalnum(zIdent[j]) && zIdent[j]!='_' ) break;
}
needQuote = sqlite3Isdigit(zIdent[0]) || sqlite3KeywordCode(zIdent, j)!=TK_ID;
if( !needQuote ){
needQuote = zIdent[j];
}
if( needQuote ) z[i++] = '"';
for(j=0; zIdent[j]; j++){
z[i++] = zIdent[j];
if( zIdent[j]=='"' ) z[i++] = '"';
}
if( needQuote ) z[i++] = '"';
z[i] = 0;
*pIdx = i;
}
/*
** Generate a CREATE TABLE statement appropriate for the given
** table. Memory to hold the text of the statement is obtained
** from sqliteMalloc() and must be freed by the calling function.
*/
static char *createTableStmt(sqlite3 *db, Table *p){
int i, k, n;
char *zStmt;
char *zSep, *zSep2, *zEnd;
Column *pCol;
n = 0;
for(pCol = p->aCol, i=0; i<p->nCol; i++, pCol++){
n += identLength(pCol->zName) + 5;
}
n += identLength(p->zName);
if( n<50 ){
zSep = "";
zSep2 = ",";
zEnd = ")";
}else{
zSep = "\n ";
zSep2 = ",\n ";
zEnd = "\n)";
}
n += 35 + 6*p->nCol;
zStmt = sqlite3DbMallocRaw(0, n);
if( zStmt==0 ){
db->mallocFailed = 1;
return 0;
}
sqlite3_snprintf(n, zStmt, "CREATE TABLE ");
k = sqlite3Strlen30(zStmt);
identPut(zStmt, &k, p->zName);
zStmt[k++] = '(';
for(pCol=p->aCol, i=0; i<p->nCol; i++, pCol++){
static const char * const azType[] = {
/* SQLITE_AFF_TEXT */ " TEXT",
/* SQLITE_AFF_NONE */ "",
/* SQLITE_AFF_NUMERIC */ " NUM",
/* SQLITE_AFF_INTEGER */ " INT",
/* SQLITE_AFF_REAL */ " REAL"
};
int len;
const char *zType;
sqlite3_snprintf(n-k, &zStmt[k], zSep);
k += sqlite3Strlen30(&zStmt[k]);
zSep = zSep2;
identPut(zStmt, &k, pCol->zName);
assert( pCol->affinity-SQLITE_AFF_TEXT >= 0 );
assert( pCol->affinity-SQLITE_AFF_TEXT < ArraySize(azType) );
testcase( pCol->affinity==SQLITE_AFF_TEXT );
testcase( pCol->affinity==SQLITE_AFF_NONE );
testcase( pCol->affinity==SQLITE_AFF_NUMERIC );
testcase( pCol->affinity==SQLITE_AFF_INTEGER );
testcase( pCol->affinity==SQLITE_AFF_REAL );
zType = azType[pCol->affinity - SQLITE_AFF_TEXT];
len = sqlite3Strlen30(zType);
assert( pCol->affinity==SQLITE_AFF_NONE
|| pCol->affinity==sqlite3AffinityType(zType) );
memcpy(&zStmt[k], zType, len);
k += len;
assert( k<=n );
}
sqlite3_snprintf(n-k, &zStmt[k], "%s", zEnd);
return zStmt;
}
/*
** This routine is called to report the final ")" that terminates
** a CREATE TABLE statement.
**
** The table structure that other action routines have been building
** is added to the internal hash tables, assuming no errors have
** occurred.
**
** An entry for the table is made in the master table on disk, unless
** this is a temporary table or db->init.busy==1. When db->init.busy==1
** it means we are reading the sqlite_master table because we just
** connected to the database or because the sqlite_master table has
** recently changed, so the entry for this table already exists in
** the sqlite_master table. We do not want to create it again.
**
** If the pSelect argument is not NULL, it means that this routine
** was called to create a table generated from a
** "CREATE TABLE ... AS SELECT ..." statement. The column names of
** the new table will match the result set of the SELECT.
*/
void sqlite3EndTable(
Parse *pParse, /* Parse context */
Token *pCons, /* The ',' token after the last column defn. */
Token *pEnd, /* The final ')' token in the CREATE TABLE */
Select *pSelect /* Select from a "CREATE ... AS SELECT" */
){
Table *p;
sqlite3 *db = pParse->db;
int iDb;
if( (pEnd==0 && pSelect==0) || db->mallocFailed ){
return;
}
p = pParse->pNewTable;
if( p==0 ) return;
assert( !db->init.busy || !pSelect );
iDb = sqlite3SchemaToIndex(db, p->pSchema);
#ifndef SQLITE_OMIT_CHECK
/* Resolve names in all CHECK constraint expressions.
*/
if( p->pCheck ){
SrcList sSrc; /* Fake SrcList for pParse->pNewTable */
NameContext sNC; /* Name context for pParse->pNewTable */
memset(&sNC, 0, sizeof(sNC));
memset(&sSrc, 0, sizeof(sSrc));
sSrc.nSrc = 1;
sSrc.a[0].zName = p->zName;
sSrc.a[0].pTab = p;
sSrc.a[0].iCursor = -1;
sNC.pParse = pParse;
sNC.pSrcList = &sSrc;
sNC.isCheck = 1;
if( sqlite3ResolveExprNames(&sNC, p->pCheck) ){
return;
}
}
#endif /* !defined(SQLITE_OMIT_CHECK) */
/* If the db->init.busy is 1 it means we are reading the SQL off the
** "sqlite_master" or "sqlite_temp_master" table on the disk.
** So do not write to the disk again. Extract the root page number
** for the table from the db->init.newTnum field. (The page number
** should have been put there by the sqliteOpenCb routine.)
*/
if( db->init.busy ){
p->tnum = db->init.newTnum;
}
/* If not initializing, then create a record for the new table
** in the SQLITE_MASTER table of the database.
**
** If this is a TEMPORARY table, write the entry into the auxiliary
** file instead of into the main database file.
*/
if( !db->init.busy ){
int n;
Vdbe *v;
char *zType; /* "view" or "table" */
char *zType2; /* "VIEW" or "TABLE" */
char *zStmt; /* Text of the CREATE TABLE or CREATE VIEW statement */
v = sqlite3GetVdbe(pParse);
if( NEVER(v==0) ) return;
sqlite3VdbeAddOp1(v, OP_Close, 0);
/*
** Initialize zType for the new view or table.
*/
if( p->pSelect==0 ){
/* A regular table */
zType = "table";
zType2 = "TABLE";
#ifndef SQLITE_OMIT_VIEW
}else{
/* A view */
zType = "view";
zType2 = "VIEW";
#endif
}
/* If this is a CREATE TABLE xx AS SELECT ..., execute the SELECT
** statement to populate the new table. The root-page number for the
** new table is in register pParse->regRoot.
**
** Once the SELECT has been coded by sqlite3Select(), it is in a
** suitable state to query for the column names and types to be used
** by the new table.
**
** A shared-cache write-lock is not required to write to the new table,
** as a schema-lock must have already been obtained to create it. Since
** a schema-lock excludes all other database users, the write-lock would
** be redundant.
*/
if( pSelect ){
SelectDest dest;
Table *pSelTab;
assert(pParse->nTab==1);
sqlite3VdbeAddOp3(v, OP_OpenWrite, 1, pParse->regRoot, iDb);
sqlite3VdbeChangeP5(v, 1);
pParse->nTab = 2;
sqlite3SelectDestInit(&dest, SRT_Table, 1);
sqlite3Select(pParse, pSelect, &dest);
sqlite3VdbeAddOp1(v, OP_Close, 1);
if( pParse->nErr==0 ){
pSelTab = sqlite3ResultSetOfSelect(pParse, pSelect);
if( pSelTab==0 ) return;
assert( p->aCol==0 );
p->nCol = pSelTab->nCol;
p->aCol = pSelTab->aCol;
pSelTab->nCol = 0;
pSelTab->aCol = 0;
sqlite3DeleteTable(db, pSelTab);
}
}
/* Compute the complete text of the CREATE statement */
if( pSelect ){
zStmt = createTableStmt(db, p);
}else{
n = (int)(pEnd->z - pParse->sNameToken.z) + 1;
zStmt = sqlite3MPrintf(db,
"CREATE %s %.*s", zType2, n, pParse->sNameToken.z
);
}
/* A slot for the record has already been allocated in the
** SQLITE_MASTER table. We just need to update that slot with all
** the information we've collected.
*/
sqlite3NestedParse(pParse,
"UPDATE %Q.%s "
"SET type='%s', name=%Q, tbl_name=%Q, rootpage=#%d, sql=%Q "
"WHERE rowid=#%d",
db->aDb[iDb].zName, SCHEMA_TABLE(iDb),
zType,
p->zName,
p->zName,
pParse->regRoot,
zStmt,
pParse->regRowid
);
sqlite3DbFree(db, zStmt);
sqlite3ChangeCookie(pParse, iDb);
#ifndef SQLITE_OMIT_AUTOINCREMENT
/* Check to see if we need to create an sqlite_sequence table for
** keeping track of autoincrement keys.
*/
if( p->tabFlags & TF_Autoincrement ){
Db *pDb = &db->aDb[iDb];
assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
if( pDb->pSchema->pSeqTab==0 ){
sqlite3NestedParse(pParse,
"CREATE TABLE %Q.sqlite_sequence(name,seq)",
pDb->zName
);
}
}
#endif
/* Reparse everything to update our internal data structures */
sqlite3VdbeAddOp4(v, OP_ParseSchema, iDb, 0, 0,
sqlite3MPrintf(db, "tbl_name='%q'",p->zName), P4_DYNAMIC);
}
/* Add the table to the in-memory representation of the database.
*/
if( db->init.busy ){
Table *pOld;
Schema *pSchema = p->pSchema;
assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
pOld = sqlite3HashInsert(&pSchema->tblHash, p->zName,
sqlite3Strlen30(p->zName),p);
if( pOld ){
assert( p==pOld ); /* Malloc must have failed inside HashInsert() */
db->mallocFailed = 1;
return;
}
pParse->pNewTable = 0;
db->nTable++;
db->flags |= SQLITE_InternChanges;
#ifndef SQLITE_OMIT_ALTERTABLE
if( !p->pSelect ){
const char *zName = (const char *)pParse->sNameToken.z;
int nName;
assert( !pSelect && pCons && pEnd );
if( pCons->z==0 ){
pCons = pEnd;
}
nName = (int)((const char *)pCons->z - zName);
p->addColOffset = 13 + sqlite3Utf8CharLen(zName, nName);
}
#endif
}
}
#ifndef SQLITE_OMIT_VIEW
/*
** The parser calls this routine in order to create a new VIEW
*/
void sqlite3CreateView(
Parse *pParse, /* The parsing context */
Token *pBegin, /* The CREATE token that begins the statement */
Token *pName1, /* The token that holds the name of the view */
Token *pName2, /* The token that holds the name of the view */
Select *pSelect, /* A SELECT statement that will become the new view */
int isTemp, /* TRUE for a TEMPORARY view */
int noErr /* Suppress error messages if VIEW already exists */
){
Table *p;
int n;
const char *z;
Token sEnd;
DbFixer sFix;
Token *pName;
int iDb;
sqlite3 *db = pParse->db;
if( pParse->nVar>0 ){
sqlite3ErrorMsg(pParse, "parameters are not allowed in views");
sqlite3SelectDelete(db, pSelect);
return;
}
sqlite3StartTable(pParse, pName1, pName2, isTemp, 1, 0, noErr);
p = pParse->pNewTable;
if( p==0 || pParse->nErr ){
sqlite3SelectDelete(db, pSelect);
return;
}
sqlite3TwoPartName(pParse, pName1, pName2, &pName);
iDb = sqlite3SchemaToIndex(db, p->pSchema);
if( sqlite3FixInit(&sFix, pParse, iDb, "view", pName)
&& sqlite3FixSelect(&sFix, pSelect)
){
sqlite3SelectDelete(db, pSelect);
return;
}
/* Make a copy of the entire SELECT statement that defines the view.
** This will force all the Expr.token.z values to be dynamically
** allocated rather than point to the input string - which means that
** they will persist after the current sqlite3_exec() call returns.
*/
p->pSelect = sqlite3SelectDup(db, pSelect, EXPRDUP_REDUCE);
sqlite3SelectDelete(db, pSelect);
if( db->mallocFailed ){
return;
}
if( !db->init.busy ){
sqlite3ViewGetColumnNames(pParse, p);
}
/* Locate the end of the CREATE VIEW statement. Make sEnd point to
** the end.
*/
sEnd = pParse->sLastToken;
if( ALWAYS(sEnd.z[0]!=0) && sEnd.z[0]!=';' ){
sEnd.z += sEnd.n;
}
sEnd.n = 0;
n = (int)(sEnd.z - pBegin->z);
z = pBegin->z;
while( ALWAYS(n>0) && sqlite3Isspace(z[n-1]) ){ n--; }
sEnd.z = &z[n-1];
sEnd.n = 1;
/* Use sqlite3EndTable() to add the view to the SQLITE_MASTER table */
sqlite3EndTable(pParse, 0, &sEnd, 0);
return;
}
#endif /* SQLITE_OMIT_VIEW */
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE)
/*
** The Table structure pTable is really a VIEW. Fill in the names of
** the columns of the view in the pTable structure. Return the number
** of errors. If an error is seen leave an error message in pParse->zErrMsg.
*/
int sqlite3ViewGetColumnNames(Parse *pParse, Table *pTable){
Table *pSelTab; /* A fake table from which we get the result set */
Select *pSel; /* Copy of the SELECT that implements the view */
int nErr = 0; /* Number of errors encountered */
int n; /* Temporarily holds the number of cursors assigned */
sqlite3 *db = pParse->db; /* Database connection for malloc errors */
int (*xAuth)(void*,int,const char*,const char*,const char*,const char*);
assert( pTable );
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( sqlite3VtabCallConnect(pParse, pTable) ){
return SQLITE_ERROR;
}
if( IsVirtual(pTable) ) return 0;
#endif
#ifndef SQLITE_OMIT_VIEW
/* A positive nCol means the columns names for this view are
** already known.
*/
if( pTable->nCol>0 ) return 0;
/* A negative nCol is a special marker meaning that we are currently
** trying to compute the column names. If we enter this routine with
** a negative nCol, it means two or more views form a loop, like this:
**
** CREATE VIEW one AS SELECT * FROM two;
** CREATE VIEW two AS SELECT * FROM one;
**
** Actually, the error above is now caught prior to reaching this point.
** But the following test is still important as it does come up
** in the following:
**
** CREATE TABLE main.ex1(a);
** CREATE TEMP VIEW ex1 AS SELECT a FROM ex1;
** SELECT * FROM temp.ex1;
*/
if( pTable->nCol<0 ){
sqlite3ErrorMsg(pParse, "view %s is circularly defined", pTable->zName);
return 1;
}
assert( pTable->nCol>=0 );
/* If we get this far, it means we need to compute the table names.
** Note that the call to sqlite3ResultSetOfSelect() will expand any
** "*" elements in the results set of the view and will assign cursors
** to the elements of the FROM clause. But we do not want these changes
** to be permanent. So the computation is done on a copy of the SELECT
** statement that defines the view.
*/
assert( pTable->pSelect );
pSel = sqlite3SelectDup(db, pTable->pSelect, 0);
if( pSel ){
u8 enableLookaside = db->lookaside.bEnabled;
n = pParse->nTab;
sqlite3SrcListAssignCursors(pParse, pSel->pSrc);
pTable->nCol = -1;
db->lookaside.bEnabled = 0;
#ifndef SQLITE_OMIT_AUTHORIZATION
xAuth = db->xAuth;
db->xAuth = 0;
pSelTab = sqlite3ResultSetOfSelect(pParse, pSel);
db->xAuth = xAuth;
#else
pSelTab = sqlite3ResultSetOfSelect(pParse, pSel);
#endif
db->lookaside.bEnabled = enableLookaside;
pParse->nTab = n;
if( pSelTab ){
assert( pTable->aCol==0 );
pTable->nCol = pSelTab->nCol;
pTable->aCol = pSelTab->aCol;
pSelTab->nCol = 0;
pSelTab->aCol = 0;
sqlite3DeleteTable(db, pSelTab);
assert( sqlite3SchemaMutexHeld(db, 0, pTable->pSchema) );
pTable->pSchema->flags |= DB_UnresetViews;
}else{
pTable->nCol = 0;
nErr++;
}
sqlite3SelectDelete(db, pSel);
} else {
nErr++;
}
#endif /* SQLITE_OMIT_VIEW */
return nErr;
}
#endif /* !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE) */
#ifndef SQLITE_OMIT_VIEW
/*
** Clear the column names from every VIEW in database idx.
*/
static void sqliteViewResetAll(sqlite3 *db, int idx){
HashElem *i;
assert( sqlite3SchemaMutexHeld(db, idx, 0) );
if( !DbHasProperty(db, idx, DB_UnresetViews) ) return;
for(i=sqliteHashFirst(&db->aDb[idx].pSchema->tblHash); i;i=sqliteHashNext(i)){
Table *pTab = sqliteHashData(i);
if( pTab->pSelect ){
sqliteDeleteColumnNames(db, pTab);
pTab->aCol = 0;
pTab->nCol = 0;
}
}
DbClearProperty(db, idx, DB_UnresetViews);
}
#else
# define sqliteViewResetAll(A,B)
#endif /* SQLITE_OMIT_VIEW */
/*
** This function is called by the VDBE to adjust the internal schema
** used by SQLite when the btree layer moves a table root page. The
** root-page of a table or index in database iDb has changed from iFrom
** to iTo.
**
** Ticket #1728: The symbol table might still contain information
** on tables and/or indices that are the process of being deleted.
** If you are unlucky, one of those deleted indices or tables might
** have the same rootpage number as the real table or index that is
** being moved. So we cannot stop searching after the first match
** because the first match might be for one of the deleted indices
** or tables and not the table/index that is actually being moved.
** We must continue looping until all tables and indices with
** rootpage==iFrom have been converted to have a rootpage of iTo
** in order to be certain that we got the right one.
*/
#ifndef SQLITE_OMIT_AUTOVACUUM
void sqlite3RootPageMoved(sqlite3 *db, int iDb, int iFrom, int iTo){
HashElem *pElem;
Hash *pHash;
Db *pDb;
assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
pDb = &db->aDb[iDb];
pHash = &pDb->pSchema->tblHash;
for(pElem=sqliteHashFirst(pHash); pElem; pElem=sqliteHashNext(pElem)){
Table *pTab = sqliteHashData(pElem);
if( pTab->tnum==iFrom ){
pTab->tnum = iTo;
}
}
pHash = &pDb->pSchema->idxHash;
for(pElem=sqliteHashFirst(pHash); pElem; pElem=sqliteHashNext(pElem)){
Index *pIdx = sqliteHashData(pElem);
if( pIdx->tnum==iFrom ){
pIdx->tnum = iTo;
}
}
}
#endif
/*
** Write code to erase the table with root-page iTable from database iDb.
** Also write code to modify the sqlite_master table and internal schema
** if a root-page of another table is moved by the btree-layer whilst
** erasing iTable (this can happen with an auto-vacuum database).
*/
static void destroyRootPage(Parse *pParse, int iTable, int iDb){
Vdbe *v = sqlite3GetVdbe(pParse);
int r1 = sqlite3GetTempReg(pParse);
sqlite3VdbeAddOp3(v, OP_Destroy, iTable, r1, iDb);
sqlite3MayAbort(pParse);
#ifndef SQLITE_OMIT_AUTOVACUUM
/* OP_Destroy stores an in integer r1. If this integer
** is non-zero, then it is the root page number of a table moved to
** location iTable. The following code modifies the sqlite_master table to
** reflect this.
**
** The "#NNN" in the SQL is a special constant that means whatever value
** is in register NNN. See grammar rules associated with the TK_REGISTER
** token for additional information.
*/
sqlite3NestedParse(pParse,
"UPDATE %Q.%s SET rootpage=%d WHERE #%d AND rootpage=#%d",
pParse->db->aDb[iDb].zName, SCHEMA_TABLE(iDb), iTable, r1, r1);
#endif
sqlite3ReleaseTempReg(pParse, r1);
}
/*
** Write VDBE code to erase table pTab and all associated indices on disk.
** Code to update the sqlite_master tables and internal schema definitions
** in case a root-page belonging to another table is moved by the btree layer
** is also added (this can happen with an auto-vacuum database).
*/
static void destroyTable(Parse *pParse, Table *pTab){
#ifdef SQLITE_OMIT_AUTOVACUUM
Index *pIdx;
int iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
destroyRootPage(pParse, pTab->tnum, iDb);
for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
destroyRootPage(pParse, pIdx->tnum, iDb);
}
#else
/* If the database may be auto-vacuum capable (if SQLITE_OMIT_AUTOVACUUM
** is not defined), then it is important to call OP_Destroy on the
** table and index root-pages in order, starting with the numerically
** largest root-page number. This guarantees that none of the root-pages
** to be destroyed is relocated by an earlier OP_Destroy. i.e. if the
** following were coded:
**
** OP_Destroy 4 0
** ...
** OP_Destroy 5 0
**
** and root page 5 happened to be the largest root-page number in the
** database, then root page 5 would be moved to page 4 by the
** "OP_Destroy 4 0" opcode. The subsequent "OP_Destroy 5 0" would hit
** a free-list page.
*/
int iTab = pTab->tnum;
int iDestroyed = 0;
while( 1 ){
Index *pIdx;
int iLargest = 0;
if( iDestroyed==0 || iTab<iDestroyed ){
iLargest = iTab;
}
for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
int iIdx = pIdx->tnum;
assert( pIdx->pSchema==pTab->pSchema );
if( (iDestroyed==0 || (iIdx<iDestroyed)) && iIdx>iLargest ){
iLargest = iIdx;
}
}
if( iLargest==0 ){
return;
}else{
int iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
destroyRootPage(pParse, iLargest, iDb);
iDestroyed = iLargest;
}
}
#endif
}
/*
** This routine is called to do the work of a DROP TABLE statement.
** pName is the name of the table to be dropped.
*/
void sqlite3DropTable(Parse *pParse, SrcList *pName, int isView, int noErr){
Table *pTab;
Vdbe *v;
sqlite3 *db = pParse->db;
int iDb;
if( db->mallocFailed ){
goto exit_drop_table;
}
assert( pParse->nErr==0 );
assert( pName->nSrc==1 );
if( noErr ) db->suppressErr++;
pTab = sqlite3LocateTable(pParse, isView,
pName->a[0].zName, pName->a[0].zDatabase);
if( noErr ) db->suppressErr--;
if( pTab==0 ){
if( noErr ) sqlite3CodeVerifyNamedSchema(pParse, pName->a[0].zDatabase);
goto exit_drop_table;
}
iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
assert( iDb>=0 && iDb<db->nDb );
/* If pTab is a virtual table, call ViewGetColumnNames() to ensure
** it is initialized.
*/
if( IsVirtual(pTab) && sqlite3ViewGetColumnNames(pParse, pTab) ){
goto exit_drop_table;
}
#ifndef SQLITE_OMIT_AUTHORIZATION
{
int code;
const char *zTab = SCHEMA_TABLE(iDb);
const char *zDb = db->aDb[iDb].zName;
const char *zArg2 = 0;
if( sqlite3AuthCheck(pParse, SQLITE_DELETE, zTab, 0, zDb)){
goto exit_drop_table;
}
if( isView ){
if( !OMIT_TEMPDB && iDb==1 ){
code = SQLITE_DROP_TEMP_VIEW;
}else{
code = SQLITE_DROP_VIEW;
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
}else if( IsVirtual(pTab) ){
code = SQLITE_DROP_VTABLE;
zArg2 = sqlite3GetVTable(db, pTab)->pMod->zName;
#endif
}else{
if( !OMIT_TEMPDB && iDb==1 ){
code = SQLITE_DROP_TEMP_TABLE;
}else{
code = SQLITE_DROP_TABLE;
}
}
if( sqlite3AuthCheck(pParse, code, pTab->zName, zArg2, zDb) ){
goto exit_drop_table;
}
if( sqlite3AuthCheck(pParse, SQLITE_DELETE, pTab->zName, 0, zDb) ){
goto exit_drop_table;
}
}
#endif
if( sqlite3StrNICmp(pTab->zName, "sqlite_", 7)==0 ){
sqlite3ErrorMsg(pParse, "table %s may not be dropped", pTab->zName);
goto exit_drop_table;
}
#ifndef SQLITE_OMIT_VIEW
/* Ensure DROP TABLE is not used on a view, and DROP VIEW is not used
** on a table.
*/
if( isView && pTab->pSelect==0 ){
sqlite3ErrorMsg(pParse, "use DROP TABLE to delete table %s", pTab->zName);
goto exit_drop_table;
}
if( !isView && pTab->pSelect ){
sqlite3ErrorMsg(pParse, "use DROP VIEW to delete view %s", pTab->zName);
goto exit_drop_table;
}
#endif
/* Generate code to remove the table from the master table
** on disk.
*/
v = sqlite3GetVdbe(pParse);
if( v ){
Trigger *pTrigger;
Db *pDb = &db->aDb[iDb];
sqlite3BeginWriteOperation(pParse, 1, iDb);
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( IsVirtual(pTab) ){
sqlite3VdbeAddOp0(v, OP_VBegin);
}
#endif
sqlite3FkDropTable(pParse, pName, pTab);
/* Drop all triggers associated with the table being dropped. Code
** is generated to remove entries from sqlite_master and/or
** sqlite_temp_master if required.
*/
pTrigger = sqlite3TriggerList(pParse, pTab);
while( pTrigger ){
assert( pTrigger->pSchema==pTab->pSchema ||
pTrigger->pSchema==db->aDb[1].pSchema );
sqlite3DropTriggerPtr(pParse, pTrigger);
pTrigger = pTrigger->pNext;
}
#ifndef SQLITE_OMIT_AUTOINCREMENT
/* Remove any entries of the sqlite_sequence table associated with
** the table being dropped. This is done before the table is dropped
** at the btree level, in case the sqlite_sequence table needs to
** move as a result of the drop (can happen in auto-vacuum mode).
*/
if( pTab->tabFlags & TF_Autoincrement ){
sqlite3NestedParse(pParse,
"DELETE FROM %s.sqlite_sequence WHERE name=%Q",
pDb->zName, pTab->zName
);
}
#endif
/* Drop all SQLITE_MASTER table and index entries that refer to the
** table. The program name loops through the master table and deletes
** every row that refers to a table of the same name as the one being
** dropped. Triggers are handled seperately because a trigger can be
** created in the temp database that refers to a table in another
** database.
*/
sqlite3NestedParse(pParse,
"DELETE FROM %Q.%s WHERE tbl_name=%Q and type!='trigger'",
pDb->zName, SCHEMA_TABLE(iDb), pTab->zName);
/* Drop any statistics from the sqlite_stat1 table, if it exists */
if( sqlite3FindTable(db, "sqlite_stat1", db->aDb[iDb].zName) ){
sqlite3NestedParse(pParse,
"DELETE FROM %Q.sqlite_stat1 WHERE tbl=%Q", pDb->zName, pTab->zName
);
}
if( !isView && !IsVirtual(pTab) ){
destroyTable(pParse, pTab);
}
/* Remove the table entry from SQLite's internal schema and modify
** the schema cookie.
*/
if( IsVirtual(pTab) ){
sqlite3VdbeAddOp4(v, OP_VDestroy, iDb, 0, 0, pTab->zName, 0);
}
sqlite3VdbeAddOp4(v, OP_DropTable, iDb, 0, 0, pTab->zName, 0);
sqlite3ChangeCookie(pParse, iDb);
}
sqliteViewResetAll(db, iDb);
exit_drop_table:
sqlite3SrcListDelete(db, pName);
}
/*
** This routine is called to create a new foreign key on the table
** currently under construction. pFromCol determines which columns
** in the current table point to the foreign key. If pFromCol==0 then
** connect the key to the last column inserted. pTo is the name of
** the table referred to. pToCol is a list of tables in the other
** pTo table that the foreign key points to. flags contains all
** information about the conflict resolution algorithms specified
** in the ON DELETE, ON UPDATE and ON INSERT clauses.
**
** An FKey structure is created and added to the table currently
** under construction in the pParse->pNewTable field.
**
** The foreign key is set for IMMEDIATE processing. A subsequent call
** to sqlite3DeferForeignKey() might change this to DEFERRED.
*/
void sqlite3CreateForeignKey(
Parse *pParse, /* Parsing context */
ExprList *pFromCol, /* Columns in this table that point to other table */
Token *pTo, /* Name of the other table */
ExprList *pToCol, /* Columns in the other table */
int flags /* Conflict resolution algorithms. */
){
sqlite3 *db = pParse->db;
#ifndef SQLITE_OMIT_FOREIGN_KEY
FKey *pFKey = 0;
FKey *pNextTo;
Table *p = pParse->pNewTable;
int nByte;
int i;
int nCol;
char *z;
assert( pTo!=0 );
if( p==0 || IN_DECLARE_VTAB ) goto fk_end;
if( pFromCol==0 ){
int iCol = p->nCol-1;
if( NEVER(iCol<0) ) goto fk_end;
if( pToCol && pToCol->nExpr!=1 ){
sqlite3ErrorMsg(pParse, "foreign key on %s"
" should reference only one column of table %T",
p->aCol[iCol].zName, pTo);
goto fk_end;
}
nCol = 1;
}else if( pToCol && pToCol->nExpr!=pFromCol->nExpr ){
sqlite3ErrorMsg(pParse,
"number of columns in foreign key does not match the number of "
"columns in the referenced table");
goto fk_end;
}else{
nCol = pFromCol->nExpr;
}
nByte = sizeof(*pFKey) + (nCol-1)*sizeof(pFKey->aCol[0]) + pTo->n + 1;
if( pToCol ){
for(i=0; i<pToCol->nExpr; i++){
nByte += sqlite3Strlen30(pToCol->a[i].zName) + 1;
}
}
pFKey = sqlite3DbMallocZero(db, nByte );
if( pFKey==0 ){
goto fk_end;
}
pFKey->pFrom = p;
pFKey->pNextFrom = p->pFKey;
z = (char*)&pFKey->aCol[nCol];
pFKey->zTo = z;
memcpy(z, pTo->z, pTo->n);
z[pTo->n] = 0;
sqlite3Dequote(z);
z += pTo->n+1;
pFKey->nCol = nCol;
if( pFromCol==0 ){
pFKey->aCol[0].iFrom = p->nCol-1;
}else{
for(i=0; i<nCol; i++){
int j;
for(j=0; j<p->nCol; j++){
if( sqlite3StrICmp(p->aCol[j].zName, pFromCol->a[i].zName)==0 ){
pFKey->aCol[i].iFrom = j;
break;
}
}
if( j>=p->nCol ){
sqlite3ErrorMsg(pParse,
"unknown column \"%s\" in foreign key definition",
pFromCol->a[i].zName);
goto fk_end;
}
}
}
if( pToCol ){
for(i=0; i<nCol; i++){
int n = sqlite3Strlen30(pToCol->a[i].zName);
pFKey->aCol[i].zCol = z;
memcpy(z, pToCol->a[i].zName, n);
z[n] = 0;
z += n+1;
}
}
pFKey->isDeferred = 0;
pFKey->aAction[0] = (u8)(flags & 0xff); /* ON DELETE action */
pFKey->aAction[1] = (u8)((flags >> 8 ) & 0xff); /* ON UPDATE action */
assert( sqlite3SchemaMutexHeld(db, 0, p->pSchema) );
pNextTo = (FKey *)sqlite3HashInsert(&p->pSchema->fkeyHash,
pFKey->zTo, sqlite3Strlen30(pFKey->zTo), (void *)pFKey
);
if( pNextTo==pFKey ){
db->mallocFailed = 1;
goto fk_end;
}
if( pNextTo ){
assert( pNextTo->pPrevTo==0 );
pFKey->pNextTo = pNextTo;
pNextTo->pPrevTo = pFKey;
}
/* Link the foreign key to the table as the last step.
*/
p->pFKey = pFKey;
pFKey = 0;
fk_end:
sqlite3DbFree(db, pFKey);
#endif /* !defined(SQLITE_OMIT_FOREIGN_KEY) */
sqlite3ExprListDelete(db, pFromCol);
sqlite3ExprListDelete(db, pToCol);
}
/*
** This routine is called when an INITIALLY IMMEDIATE or INITIALLY DEFERRED
** clause is seen as part of a foreign key definition. The isDeferred
** parameter is 1 for INITIALLY DEFERRED and 0 for INITIALLY IMMEDIATE.
** The behavior of the most recently created foreign key is adjusted
** accordingly.
*/
void sqlite3DeferForeignKey(Parse *pParse, int isDeferred){
#ifndef SQLITE_OMIT_FOREIGN_KEY
Table *pTab;
FKey *pFKey;
if( (pTab = pParse->pNewTable)==0 || (pFKey = pTab->pFKey)==0 ) return;
assert( isDeferred==0 || isDeferred==1 ); /* EV: R-30323-21917 */
pFKey->isDeferred = (u8)isDeferred;
#endif
}
/*
** Generate code that will erase and refill index *pIdx. This is
** used to initialize a newly created index or to recompute the
** content of an index in response to a REINDEX command.
**
** if memRootPage is not negative, it means that the index is newly
** created. The register specified by memRootPage contains the
** root page number of the index. If memRootPage is negative, then
** the index already exists and must be cleared before being refilled and
** the root page number of the index is taken from pIndex->tnum.
*/
static void sqlite3RefillIndex(Parse *pParse, Index *pIndex, int memRootPage){
Table *pTab = pIndex->pTable; /* The table that is indexed */
int iTab = pParse->nTab++; /* Btree cursor used for pTab */
int iIdx = pParse->nTab++; /* Btree cursor used for pIndex */
int addr1; /* Address of top of loop */
int tnum; /* Root page of index */
Vdbe *v; /* Generate code into this virtual machine */
KeyInfo *pKey; /* KeyInfo for index */
int regIdxKey; /* Registers containing the index key */
int regRecord; /* Register holding assemblied index record */
sqlite3 *db = pParse->db; /* The database connection */
int iDb = sqlite3SchemaToIndex(db, pIndex->pSchema);
#ifndef SQLITE_OMIT_AUTHORIZATION
if( sqlite3AuthCheck(pParse, SQLITE_REINDEX, pIndex->zName, 0,
db->aDb[iDb].zName ) ){
return;
}
#endif
/* Require a write-lock on the table to perform this operation */
sqlite3TableLock(pParse, iDb, pTab->tnum, 1, pTab->zName);
v = sqlite3GetVdbe(pParse);
if( v==0 ) return;
if( memRootPage>=0 ){
tnum = memRootPage;
}else{
tnum = pIndex->tnum;
sqlite3VdbeAddOp2(v, OP_Clear, tnum, iDb);
}
pKey = sqlite3IndexKeyinfo(pParse, pIndex);
sqlite3VdbeAddOp4(v, OP_OpenWrite, iIdx, tnum, iDb,
(char *)pKey, P4_KEYINFO_HANDOFF);
if( memRootPage>=0 ){
sqlite3VdbeChangeP5(v, 1);
}
sqlite3OpenTable(pParse, iTab, iDb, pTab, OP_OpenRead);
addr1 = sqlite3VdbeAddOp2(v, OP_Rewind, iTab, 0);
regRecord = sqlite3GetTempReg(pParse);
regIdxKey = sqlite3GenerateIndexKey(pParse, pIndex, iTab, regRecord, 1);
if( pIndex->onError!=OE_None ){
const int regRowid = regIdxKey + pIndex->nColumn;
const int j2 = sqlite3VdbeCurrentAddr(v) + 2;
void * const pRegKey = SQLITE_INT_TO_PTR(regIdxKey);
/* The registers accessed by the OP_IsUnique opcode were allocated
** using sqlite3GetTempRange() inside of the sqlite3GenerateIndexKey()
** call above. Just before that function was freed they were released
** (made available to the compiler for reuse) using
** sqlite3ReleaseTempRange(). So in some ways having the OP_IsUnique
** opcode use the values stored within seems dangerous. However, since
** we can be sure that no other temp registers have been allocated
** since sqlite3ReleaseTempRange() was called, it is safe to do so.
*/
sqlite3VdbeAddOp4(v, OP_IsUnique, iIdx, j2, regRowid, pRegKey, P4_INT32);
sqlite3HaltConstraint(
pParse, OE_Abort, "indexed columns are not unique", P4_STATIC);
}
sqlite3VdbeAddOp2(v, OP_IdxInsert, iIdx, regRecord);
sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
sqlite3ReleaseTempReg(pParse, regRecord);
sqlite3VdbeAddOp2(v, OP_Next, iTab, addr1+1);
sqlite3VdbeJumpHere(v, addr1);
sqlite3VdbeAddOp1(v, OP_Close, iTab);
sqlite3VdbeAddOp1(v, OP_Close, iIdx);
}
/*
** Create a new index for an SQL table. pName1.pName2 is the name of the index
** and pTblList is the name of the table that is to be indexed. Both will
** be NULL for a primary key or an index that is created to satisfy a
** UNIQUE constraint. If pTable and pIndex are NULL, use pParse->pNewTable
** as the table to be indexed. pParse->pNewTable is a table that is
** currently being constructed by a CREATE TABLE statement.
**
** pList is a list of columns to be indexed. pList will be NULL if this
** is a primary key or unique-constraint on the most recent column added
** to the table currently under construction.
**
** If the index is created successfully, return a pointer to the new Index
** structure. This is used by sqlite3AddPrimaryKey() to mark the index
** as the tables primary key (Index.autoIndex==2).
*/
Index *sqlite3CreateIndex(
Parse *pParse, /* All information about this parse */
Token *pName1, /* First part of index name. May be NULL */
Token *pName2, /* Second part of index name. May be NULL */
SrcList *pTblName, /* Table to index. Use pParse->pNewTable if 0 */
ExprList *pList, /* A list of columns to be indexed */
int onError, /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */
Token *pStart, /* The CREATE token that begins this statement */
Token *pEnd, /* The ")" that closes the CREATE INDEX statement */
int sortOrder, /* Sort order of primary key when pList==NULL */
int ifNotExist /* Omit error if index already exists */
){
Index *pRet = 0; /* Pointer to return */
Table *pTab = 0; /* Table to be indexed */
Index *pIndex = 0; /* The index to be created */
char *zName = 0; /* Name of the index */
int nName; /* Number of characters in zName */
int i, j;
Token nullId; /* Fake token for an empty ID list */
DbFixer sFix; /* For assigning database names to pTable */
int sortOrderMask; /* 1 to honor DESC in index. 0 to ignore. */
sqlite3 *db = pParse->db;
Db *pDb; /* The specific table containing the indexed database */
int iDb; /* Index of the database that is being written */
Token *pName = 0; /* Unqualified name of the index to create */
struct ExprList_item *pListItem; /* For looping over pList */
int nCol;
int nExtra = 0;
char *zExtra;
assert( pStart==0 || pEnd!=0 ); /* pEnd must be non-NULL if pStart is */
assert( pParse->nErr==0 ); /* Never called with prior errors */
if( db->mallocFailed || IN_DECLARE_VTAB ){
goto exit_create_index;
}
if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){
goto exit_create_index;
}
/*
** Find the table that is to be indexed. Return early if not found.
*/
if( pTblName!=0 ){
/* Use the two-part index name to determine the database
** to search for the table. 'Fix' the table name to this db
** before looking up the table.
*/
assert( pName1 && pName2 );
iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pName);
if( iDb<0 ) goto exit_create_index;
#ifndef SQLITE_OMIT_TEMPDB
/* If the index name was unqualified, check if the the table
** is a temp table. If so, set the database to 1. Do not do this
** if initialising a database schema.
*/
if( !db->init.busy ){
pTab = sqlite3SrcListLookup(pParse, pTblName);
if( pName2->n==0 && pTab && pTab->pSchema==db->aDb[1].pSchema ){
iDb = 1;
}
}
#endif
if( sqlite3FixInit(&sFix, pParse, iDb, "index", pName) &&
sqlite3FixSrcList(&sFix, pTblName)
){
/* Because the parser constructs pTblName from a single identifier,
** sqlite3FixSrcList can never fail. */
assert(0);
}
pTab = sqlite3LocateTable(pParse, 0, pTblName->a[0].zName,
pTblName->a[0].zDatabase);
if( !pTab || db->mallocFailed ) goto exit_create_index;
assert( db->aDb[iDb].pSchema==pTab->pSchema );
}else{
assert( pName==0 );
pTab = pParse->pNewTable;
if( !pTab ) goto exit_create_index;
iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
}
pDb = &db->aDb[iDb];
assert( pTab!=0 );
assert( pParse->nErr==0 );
if( sqlite3StrNICmp(pTab->zName, "sqlite_", 7)==0
&& memcmp(&pTab->zName[7],"altertab_",9)!=0 ){
sqlite3ErrorMsg(pParse, "table %s may not be indexed", pTab->zName);
goto exit_create_index;
}
#ifndef SQLITE_OMIT_VIEW
if( pTab->pSelect ){
sqlite3ErrorMsg(pParse, "views may not be indexed");
goto exit_create_index;
}
#endif
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( IsVirtual(pTab) ){
sqlite3ErrorMsg(pParse, "virtual tables may not be indexed");
goto exit_create_index;
}
#endif
/*
** Find the name of the index. Make sure there is not already another
** index or table with the same name.
**
** Exception: If we are reading the names of permanent indices from the
** sqlite_master table (because some other process changed the schema) and
** one of the index names collides with the name of a temporary table or
** index, then we will continue to process this index.
**
** If pName==0 it means that we are
** dealing with a primary key or UNIQUE constraint. We have to invent our
** own name.
*/
if( pName ){
zName = sqlite3NameFromToken(db, pName);
if( zName==0 ) goto exit_create_index;
if( SQLITE_OK!=sqlite3CheckObjectName(pParse, zName) ){
goto exit_create_index;
}
if( !db->init.busy ){
if( sqlite3FindTable(db, zName, 0)!=0 ){
sqlite3ErrorMsg(pParse, "there is already a table named %s", zName);
goto exit_create_index;
}
}
if( sqlite3FindIndex(db, zName, pDb->zName)!=0 ){
if( !ifNotExist ){
sqlite3ErrorMsg(pParse, "index %s already exists", zName);
}else{
assert( !db->init.busy );
sqlite3CodeVerifySchema(pParse, iDb);
}
goto exit_create_index;
}
}else{
int n;
Index *pLoop;
for(pLoop=pTab->pIndex, n=1; pLoop; pLoop=pLoop->pNext, n++){}
zName = sqlite3MPrintf(db, "sqlite_autoindex_%s_%d", pTab->zName, n);
if( zName==0 ){
goto exit_create_index;
}
}
/* Check for authorization to create an index.
*/
#ifndef SQLITE_OMIT_AUTHORIZATION
{
const char *zDb = pDb->zName;
if( sqlite3AuthCheck(pParse, SQLITE_INSERT, SCHEMA_TABLE(iDb), 0, zDb) ){
goto exit_create_index;
}
i = SQLITE_CREATE_INDEX;
if( !OMIT_TEMPDB && iDb==1 ) i = SQLITE_CREATE_TEMP_INDEX;
if( sqlite3AuthCheck(pParse, i, zName, pTab->zName, zDb) ){
goto exit_create_index;
}
}
#endif
/* If pList==0, it means this routine was called to make a primary
** key out of the last column added to the table under construction.
** So create a fake list to simulate this.
*/
if( pList==0 ){
nullId.z = pTab->aCol[pTab->nCol-1].zName;
nullId.n = sqlite3Strlen30((char*)nullId.z);
pList = sqlite3ExprListAppend(pParse, 0, 0);
if( pList==0 ) goto exit_create_index;
sqlite3ExprListSetName(pParse, pList, &nullId, 0);
pList->a[0].sortOrder = (u8)sortOrder;
}
/* Figure out how many bytes of space are required to store explicitly
** specified collation sequence names.
*/
for(i=0; i<pList->nExpr; i++){
Expr *pExpr = pList->a[i].pExpr;
if( pExpr ){
CollSeq *pColl = pExpr->pColl;
/* Either pColl!=0 or there was an OOM failure. But if an OOM
** failure we have quit before reaching this point. */
if( ALWAYS(pColl) ){
nExtra += (1 + sqlite3Strlen30(pColl->zName));
}
}
}
/*
** Allocate the index structure.
*/
nName = sqlite3Strlen30(zName);
nCol = pList->nExpr;
pIndex = sqlite3DbMallocZero(db,
sizeof(Index) + /* Index structure */
sizeof(int)*nCol + /* Index.aiColumn */
sizeof(int)*(nCol+1) + /* Index.aiRowEst */
sizeof(char *)*nCol + /* Index.azColl */
sizeof(u8)*nCol + /* Index.aSortOrder */
nName + 1 + /* Index.zName */
nExtra /* Collation sequence names */
);
if( db->mallocFailed ){
goto exit_create_index;
}
pIndex->azColl = (char**)(&pIndex[1]);
pIndex->aiColumn = (int *)(&pIndex->azColl[nCol]);
pIndex->aiRowEst = (unsigned *)(&pIndex->aiColumn[nCol]);
pIndex->aSortOrder = (u8 *)(&pIndex->aiRowEst[nCol+1]);
pIndex->zName = (char *)(&pIndex->aSortOrder[nCol]);
zExtra = (char *)(&pIndex->zName[nName+1]);
memcpy(pIndex->zName, zName, nName+1);
pIndex->pTable = pTab;
pIndex->nColumn = pList->nExpr;
pIndex->onError = (u8)onError;
pIndex->autoIndex = (u8)(pName==0);
pIndex->pSchema = db->aDb[iDb].pSchema;
assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
/* Check to see if we should honor DESC requests on index columns
*/
if( pDb->pSchema->file_format>=4 ){
sortOrderMask = -1; /* Honor DESC */
}else{
sortOrderMask = 0; /* Ignore DESC */
}
/* Scan the names of the columns of the table to be indexed and
** load the column indices into the Index structure. Report an error
** if any column is not found.
**
** TODO: Add a test to make sure that the same column is not named
** more than once within the same index. Only the first instance of
** the column will ever be used by the optimizer. Note that using the
** same column more than once cannot be an error because that would
** break backwards compatibility - it needs to be a warning.
*/
for(i=0, pListItem=pList->a; i<pList->nExpr; i++, pListItem++){
const char *zColName = pListItem->zName;
Column *pTabCol;
int requestedSortOrder;
char *zColl; /* Collation sequence name */
for(j=0, pTabCol=pTab->aCol; j<pTab->nCol; j++, pTabCol++){
if( sqlite3StrICmp(zColName, pTabCol->zName)==0 ) break;
}
if( j>=pTab->nCol ){
sqlite3ErrorMsg(pParse, "table %s has no column named %s",
pTab->zName, zColName);
pParse->checkSchema = 1;
goto exit_create_index;
}
pIndex->aiColumn[i] = j;
/* Justification of the ALWAYS(pListItem->pExpr->pColl): Because of
** the way the "idxlist" non-terminal is constructed by the parser,
** if pListItem->pExpr is not null then either pListItem->pExpr->pColl
** must exist or else there must have been an OOM error. But if there
** was an OOM error, we would never reach this point. */
if( pListItem->pExpr && ALWAYS(pListItem->pExpr->pColl) ){
int nColl;
zColl = pListItem->pExpr->pColl->zName;
nColl = sqlite3Strlen30(zColl) + 1;
assert( nExtra>=nColl );
memcpy(zExtra, zColl, nColl);
zColl = zExtra;
zExtra += nColl;
nExtra -= nColl;
}else{
zColl = pTab->aCol[j].zColl;
if( !zColl ){
zColl = db->pDfltColl->zName;
}
}
if( !db->init.busy && !sqlite3LocateCollSeq(pParse, zColl) ){
goto exit_create_index;
}
pIndex->azColl[i] = zColl;
requestedSortOrder = pListItem->sortOrder & sortOrderMask;
pIndex->aSortOrder[i] = (u8)requestedSortOrder;
}
sqlite3DefaultRowEst(pIndex);
if( pTab==pParse->pNewTable ){
/* This routine has been called to create an automatic index as a
** result of a PRIMARY KEY or UNIQUE clause on a column definition, or
** a PRIMARY KEY or UNIQUE clause following the column definitions.
** i.e. one of:
**
** CREATE TABLE t(x PRIMARY KEY, y);
** CREATE TABLE t(x, y, UNIQUE(x, y));
**
** Either way, check to see if the table already has such an index. If
** so, don't bother creating this one. This only applies to
** automatically created indices. Users can do as they wish with
** explicit indices.
**
** Two UNIQUE or PRIMARY KEY constraints are considered equivalent
** (and thus suppressing the second one) even if they have different
** sort orders.
**
** If there are different collating sequences or if the columns of
** the constraint occur in different orders, then the constraints are
** considered distinct and both result in separate indices.
*/
Index *pIdx;
for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
int k;
assert( pIdx->onError!=OE_None );
assert( pIdx->autoIndex );
assert( pIndex->onError!=OE_None );
if( pIdx->nColumn!=pIndex->nColumn ) continue;
for(k=0; k<pIdx->nColumn; k++){
const char *z1;
const char *z2;
if( pIdx->aiColumn[k]!=pIndex->aiColumn[k] ) break;
z1 = pIdx->azColl[k];
z2 = pIndex->azColl[k];
if( z1!=z2 && sqlite3StrICmp(z1, z2) ) break;
}
if( k==pIdx->nColumn ){
if( pIdx->onError!=pIndex->onError ){
/* This constraint creates the same index as a previous
** constraint specified somewhere in the CREATE TABLE statement.
** However the ON CONFLICT clauses are different. If both this
** constraint and the previous equivalent constraint have explicit
** ON CONFLICT clauses this is an error. Otherwise, use the
** explicitly specified behaviour for the index.
*/
if( !(pIdx->onError==OE_Default || pIndex->onError==OE_Default) ){
sqlite3ErrorMsg(pParse,
"conflicting ON CONFLICT clauses specified", 0);
}
if( pIdx->onError==OE_Default ){
pIdx->onError = pIndex->onError;
}
}
goto exit_create_index;
}
}
}
/* Link the new Index structure to its table and to the other
** in-memory database structures.
*/
if( db->init.busy ){
Index *p;
assert( sqlite3SchemaMutexHeld(db, 0, pIndex->pSchema) );
p = sqlite3HashInsert(&pIndex->pSchema->idxHash,
pIndex->zName, sqlite3Strlen30(pIndex->zName),
pIndex);
if( p ){
assert( p==pIndex ); /* Malloc must have failed */
db->mallocFailed = 1;
goto exit_create_index;
}
db->flags |= SQLITE_InternChanges;
if( pTblName!=0 ){
pIndex->tnum = db->init.newTnum;
}
}
/* If the db->init.busy is 0 then create the index on disk. This
** involves writing the index into the master table and filling in the
** index with the current table contents.
**
** The db->init.busy is 0 when the user first enters a CREATE INDEX
** command. db->init.busy is 1 when a database is opened and
** CREATE INDEX statements are read out of the master table. In
** the latter case the index already exists on disk, which is why
** we don't want to recreate it.
**
** If pTblName==0 it means this index is generated as a primary key
** or UNIQUE constraint of a CREATE TABLE statement. Since the table
** has just been created, it contains no data and the index initialization
** step can be skipped.
*/
else{ /* if( db->init.busy==0 ) */
Vdbe *v;
char *zStmt;
int iMem = ++pParse->nMem;
v = sqlite3GetVdbe(pParse);
if( v==0 ) goto exit_create_index;
/* Create the rootpage for the index
*/
sqlite3BeginWriteOperation(pParse, 1, iDb);
sqlite3VdbeAddOp2(v, OP_CreateIndex, iDb, iMem);
/* Gather the complete text of the CREATE INDEX statement into
** the zStmt variable
*/
if( pStart ){
assert( pEnd!=0 );
/* A named index with an explicit CREATE INDEX statement */
zStmt = sqlite3MPrintf(db, "CREATE%s INDEX %.*s",
onError==OE_None ? "" : " UNIQUE",
pEnd->z - pName->z + 1,
pName->z);
}else{
/* An automatic index created by a PRIMARY KEY or UNIQUE constraint */
/* zStmt = sqlite3MPrintf(""); */
zStmt = 0;
}
/* Add an entry in sqlite_master for this index
*/
sqlite3NestedParse(pParse,
"INSERT INTO %Q.%s VALUES('index',%Q,%Q,#%d,%Q);",
db->aDb[iDb].zName, SCHEMA_TABLE(iDb),
pIndex->zName,
pTab->zName,
iMem,
zStmt
);
sqlite3DbFree(db, zStmt);
/* Fill the index with data and reparse the schema. Code an OP_Expire
** to invalidate all pre-compiled statements.
*/
if( pTblName ){
sqlite3RefillIndex(pParse, pIndex, iMem);
sqlite3ChangeCookie(pParse, iDb);
sqlite3VdbeAddOp4(v, OP_ParseSchema, iDb, 0, 0,
sqlite3MPrintf(db, "name='%q' AND type='index'", pIndex->zName),
P4_DYNAMIC);
sqlite3VdbeAddOp1(v, OP_Expire, 0);
}
}
/* When adding an index to the list of indices for a table, make
** sure all indices labeled OE_Replace come after all those labeled
** OE_Ignore. This is necessary for the correct constraint check
** processing (in sqlite3GenerateConstraintChecks()) as part of
** UPDATE and INSERT statements.
*/
if( db->init.busy || pTblName==0 ){
if( onError!=OE_Replace || pTab->pIndex==0
|| pTab->pIndex->onError==OE_Replace){
pIndex->pNext = pTab->pIndex;
pTab->pIndex = pIndex;
}else{
Index *pOther = pTab->pIndex;
while( pOther->pNext && pOther->pNext->onError!=OE_Replace ){
pOther = pOther->pNext;
}
pIndex->pNext = pOther->pNext;
pOther->pNext = pIndex;
}
pRet = pIndex;
pIndex = 0;
}
/* Clean up before exiting */
exit_create_index:
if( pIndex ){
sqlite3DbFree(db, pIndex->zColAff);
sqlite3DbFree(db, pIndex);
}
sqlite3ExprListDelete(db, pList);
sqlite3SrcListDelete(db, pTblName);
sqlite3DbFree(db, zName);
return pRet;
}
/*
** Fill the Index.aiRowEst[] array with default information - information
** to be used when we have not run the ANALYZE command.
**
** aiRowEst[0] is suppose to contain the number of elements in the index.
** Since we do not know, guess 1 million. aiRowEst[1] is an estimate of the
** number of rows in the table that match any particular value of the
** first column of the index. aiRowEst[2] is an estimate of the number
** of rows that match any particular combiniation of the first 2 columns
** of the index. And so forth. It must always be the case that
*
** aiRowEst[N]<=aiRowEst[N-1]
** aiRowEst[N]>=1
**
** Apart from that, we have little to go on besides intuition as to
** how aiRowEst[] should be initialized. The numbers generated here
** are based on typical values found in actual indices.
*/
void sqlite3DefaultRowEst(Index *pIdx){
unsigned *a = pIdx->aiRowEst;
int i;
unsigned n;
assert( a!=0 );
a[0] = pIdx->pTable->nRowEst;
if( a[0]<10 ) a[0] = 10;
n = 10;
for(i=1; i<=pIdx->nColumn; i++){
a[i] = n;
if( n>5 ) n--;
}
if( pIdx->onError!=OE_None ){
a[pIdx->nColumn] = 1;
}
}
/*
** This routine will drop an existing named index. This routine
** implements the DROP INDEX statement.
*/
void sqlite3DropIndex(Parse *pParse, SrcList *pName, int ifExists){
Index *pIndex;
Vdbe *v;
sqlite3 *db = pParse->db;
int iDb;
assert( pParse->nErr==0 ); /* Never called with prior errors */
if( db->mallocFailed ){
goto exit_drop_index;
}
assert( pName->nSrc==1 );
if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){
goto exit_drop_index;
}
pIndex = sqlite3FindIndex(db, pName->a[0].zName, pName->a[0].zDatabase);
if( pIndex==0 ){
if( !ifExists ){
sqlite3ErrorMsg(pParse, "no such index: %S", pName, 0);
}else{
sqlite3CodeVerifyNamedSchema(pParse, pName->a[0].zDatabase);
}
pParse->checkSchema = 1;
goto exit_drop_index;
}
if( pIndex->autoIndex ){
sqlite3ErrorMsg(pParse, "index associated with UNIQUE "
"or PRIMARY KEY constraint cannot be dropped", 0);
goto exit_drop_index;
}
iDb = sqlite3SchemaToIndex(db, pIndex->pSchema);
#ifndef SQLITE_OMIT_AUTHORIZATION
{
int code = SQLITE_DROP_INDEX;
Table *pTab = pIndex->pTable;
const char *zDb = db->aDb[iDb].zName;
const char *zTab = SCHEMA_TABLE(iDb);
if( sqlite3AuthCheck(pParse, SQLITE_DELETE, zTab, 0, zDb) ){
goto exit_drop_index;
}
if( !OMIT_TEMPDB && iDb ) code = SQLITE_DROP_TEMP_INDEX;
if( sqlite3AuthCheck(pParse, code, pIndex->zName, pTab->zName, zDb) ){
goto exit_drop_index;
}
}
#endif
/* Generate code to remove the index and from the master table */
v = sqlite3GetVdbe(pParse);
if( v ){
sqlite3BeginWriteOperation(pParse, 1, iDb);
sqlite3NestedParse(pParse,
"DELETE FROM %Q.%s WHERE name=%Q AND type='index'",
db->aDb[iDb].zName, SCHEMA_TABLE(iDb),
pIndex->zName
);
if( sqlite3FindTable(db, "sqlite_stat1", db->aDb[iDb].zName) ){
sqlite3NestedParse(pParse,
"DELETE FROM %Q.sqlite_stat1 WHERE idx=%Q",
db->aDb[iDb].zName, pIndex->zName
);
}
sqlite3ChangeCookie(pParse, iDb);
destroyRootPage(pParse, pIndex->tnum, iDb);
sqlite3VdbeAddOp4(v, OP_DropIndex, iDb, 0, 0, pIndex->zName, 0);
}
exit_drop_index:
sqlite3SrcListDelete(db, pName);
}
/*