/*
** Call from within the xCreate() or xConnect() methods to provide
** the SQLite core with additional information about the behavior
** of the virtual table being implemented.
*/
int sqlite3_vtab_config(sqlite3 *db, int op, ...){
va_list ap;
int rc = SQLITE_OK;
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
#endif
sqlite3_mutex_enter(db->mutex);
va_start(ap, op);
switch( op ){
case SQLITE_VTAB_CONSTRAINT_SUPPORT: {
VtabCtx *p = db->pVtabCtx;
if( !p ){
rc = SQLITE_MISUSE_BKPT;
}else{
assert( p->pTab==0 || (p->pTab->tabFlags & TF_Virtual)!=0 );
p->pVTable->bConstraint = (u8)va_arg(ap, int);
}
break;
}
default:
rc = SQLITE_MISUSE_BKPT;
break;
}
va_end(ap);
if( rc!=SQLITE_OK ) sqlite3Error(db, rc);
sqlite3_mutex_leave(db->mutex);
return rc;
}
static int sqlite3LockAndPrepare(
sqlite3 *db, /* Database handle. */
const char *zSql, /* UTF-8 encoded SQL statement. */
int nBytes, /* Length of zSql in bytes. */
int saveSqlFlag, /* True to copy SQL text into the sqlite3_stmt */
Vdbe *pOld, /* VM being reprepared */
sqlite3_stmt **ppStmt, /* OUT: A pointer to the prepared statement */
const char **pzTail /* OUT: End of parsed string */
){
int rc;
assert( ppStmt!=0 );
*ppStmt = 0;
if( !sqlite3SafetyCheckOk(db) ){
return SQLITE_MISUSE;
}
sqlite3_mutex_enter(db->mutex);
sqlite3BtreeEnterAll(db);
rc = sqlite3Prepare(db, zSql, nBytes, saveSqlFlag, pOld, ppStmt, pzTail);
if( rc==SQLITE_SCHEMA ){
sqlite3_finalize(*ppStmt);
rc = sqlite3Prepare(db, zSql, nBytes, saveSqlFlag, pOld, ppStmt, pzTail);
}
sqlite3BtreeLeaveAll(db);
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** Decrement the ref-count on a virtual table object. When the ref-count
** reaches zero, call the xDisconnect() method to delete the object.
*/
void sqlite3VtabUnlock(VTable *pVTab){
sqlite3 *db = pVTab->db;
assert( db );
assert( pVTab->nRef>0 );
assert( sqlite3SafetyCheckOk(db) );
pVTab->nRef--;
if( pVTab->nRef==0 ){
sqlite3_vtab *p = pVTab->pVtab;
if( p ){
#ifdef SQLITE_DEBUG
if( pVTab->db->magic==SQLITE_MAGIC_BUSY ){
(void)sqlite3SafetyOff(db);
p->pModule->xDisconnect(p);
(void)sqlite3SafetyOn(db);
} else
#endif
{
p->pModule->xDisconnect(p);
}
}
sqlite3DbFree(db, pVTab);
}
}
/* Convert zSchema to a MemDB and initialize its content.
*/
int sqlite3_deserialize(
sqlite3 *db, /* The database connection */
const char *zSchema, /* Which DB to reopen with the deserialization */
unsigned char *pData, /* The serialized database content */
sqlite3_int64 szDb, /* Number bytes in the deserialization */
sqlite3_int64 szBuf, /* Total size of buffer pData[] */
unsigned mFlags /* Zero or more SQLITE_DESERIALIZE_* flags */
){
MemFile *p;
char *zSql;
sqlite3_stmt *pStmt = 0;
int rc;
int iDb;
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) ){
return SQLITE_MISUSE_BKPT;
}
if( szDb<0 ) return SQLITE_MISUSE_BKPT;
if( szBuf<0 ) return SQLITE_MISUSE_BKPT;
#endif
sqlite3_mutex_enter(db->mutex);
if( zSchema==0 ) zSchema = db->aDb[0].zDbSName;
iDb = sqlite3FindDbName(db, zSchema);
if( iDb<0 ){
rc = SQLITE_ERROR;
goto end_deserialize;
}
zSql = sqlite3_mprintf("ATTACH x AS %Q", zSchema);
rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
sqlite3_free(zSql);
if( rc ) goto end_deserialize;
db->init.iDb = (u8)iDb;
db->init.reopenMemdb = 1;
rc = sqlite3_step(pStmt);
db->init.reopenMemdb = 0;
if( rc!=SQLITE_DONE ){
rc = SQLITE_ERROR;
goto end_deserialize;
}
p = memdbFromDbSchema(db, zSchema);
if( p==0 ){
rc = SQLITE_ERROR;
}else{
p->aData = pData;
p->sz = szDb;
p->szMax = szBuf;
p->mFlags = mFlags;
rc = SQLITE_OK;
}
end_deserialize:
sqlite3_finalize(pStmt);
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** External API function used to create a new virtual-table module.
*/
int sqlite3_create_module(
sqlite3 *db, /* Database in which module is registered */
const char *zName, /* Name assigned to this module */
const sqlite3_module *pModule, /* The definition of the module */
void *pAux /* Context pointer for xCreate/xConnect */
){
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) || zName==0 ) return SQLITE_MISUSE_BKPT;
#endif
return createModule(db, zName, pModule, pAux, 0);
}
/*
** Return the ON CONFLICT resolution mode in effect for the virtual
** table update operation currently in progress.
**
** The results of this routine are undefined unless it is called from
** within an xUpdate method.
*/
int sqlite3_vtab_on_conflict(sqlite3 *db){
static const unsigned char aMap[] = {
SQLITE_ROLLBACK, SQLITE_ABORT, SQLITE_FAIL, SQLITE_IGNORE, SQLITE_REPLACE
};
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
#endif
assert( OE_Rollback==1 && OE_Abort==2 && OE_Fail==3 );
assert( OE_Ignore==4 && OE_Replace==5 );
assert( db->vtabOnConflict>=1 && db->vtabOnConflict<=5 );
return (int)aMap[db->vtabOnConflict-1];
}
/*
** Unlock a virtual table. When the last lock is removed,
** disconnect the virtual table.
*/
void sqlite3VtabUnlock(sqlite3 *db, sqlite3_vtab *pVtab){
pVtab->nRef--;
assert(db);
assert( sqlite3SafetyCheckOk(db) );
if( pVtab->nRef==0 ){
if( db->magic==SQLITE_MAGIC_BUSY ){
(void)sqlite3SafetyOff(db);
pVtab->pModule->xDisconnect(pVtab);
(void)sqlite3SafetyOn(db);
} else {
pVtab->pModule->xDisconnect(pVtab);
}
}
}
/*
** Set or clear the access authorization function.
**
** The access authorization function is be called during the compilation
** phase to verify that the user has read and/or write access permission on
** various fields of the database. The first argument to the auth function
** is a copy of the 3rd argument to this routine. The second argument
** to the auth function is one of these constants:
**
** SQLITE_CREATE_INDEX
** SQLITE_CREATE_TABLE
** SQLITE_CREATE_TEMP_INDEX
** SQLITE_CREATE_TEMP_TABLE
** SQLITE_CREATE_TEMP_TRIGGER
** SQLITE_CREATE_TEMP_VIEW
** SQLITE_CREATE_TRIGGER
** SQLITE_CREATE_VIEW
** SQLITE_DELETE
** SQLITE_DROP_INDEX
** SQLITE_DROP_TABLE
** SQLITE_DROP_TEMP_INDEX
** SQLITE_DROP_TEMP_TABLE
** SQLITE_DROP_TEMP_TRIGGER
** SQLITE_DROP_TEMP_VIEW
** SQLITE_DROP_TRIGGER
** SQLITE_DROP_VIEW
** SQLITE_INSERT
** SQLITE_PRAGMA
** SQLITE_READ
** SQLITE_SELECT
** SQLITE_TRANSACTION
** SQLITE_UPDATE
**
** The third and fourth arguments to the auth function are the name of
** the table and the column that are being accessed. The auth function
** should return either SQLITE_OK, SQLITE_DENY, or SQLITE_IGNORE. If
** SQLITE_OK is returned, it means that access is allowed. SQLITE_DENY
** means that the SQL statement will never-run - the sqlite3_exec() call
** will return with an error. SQLITE_IGNORE means that the SQL statement
** should run but attempts to read the specified column will return NULL
** and attempts to write the column will be ignored.
**
** Setting the auth function to NULL disables this hook. The default
** setting of the auth function is NULL.
*/
int sqlite3_set_authorizer(
sqlite3 *db,
int (*xAuth)(void*,int,const char*,const char*,const char*,const char*),
void *pArg
){
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
#endif
sqlite3_mutex_enter(db->mutex);
db->xAuth = (sqlite3_xauth)xAuth;
db->pAuthArg = pArg;
sqlite3ExpirePreparedStatements(db);
sqlite3_mutex_leave(db->mutex);
return SQLITE_OK;
}
/*
** Decrement the ref-count on a virtual table object. When the ref-count
** reaches zero, call the xDisconnect() method to delete the object.
*/
void sqlite3VtabUnlock(VTable *pVTab){
sqlite3 *db = pVTab->db;
assert( db );
assert( pVTab->nRef>0 );
assert( sqlite3SafetyCheckOk(db) );
pVTab->nRef--;
if( pVTab->nRef==0 ){
sqlite3_vtab *p = pVTab->pVtab;
if( p ){
p->pModule->xDisconnect(p);
}
sqlite3DbFree(db, pVTab);
}
}
/*
** Return a pointer to the next prepared statement after pStmt associated
** with database connection pDb. If pStmt is NULL, return the first
** prepared statement for the database connection. Return NULL if there
** are no more.
*/
sqlite3_stmt *sqlite3_next_stmt(sqlite3 *pDb, sqlite3_stmt *pStmt){
sqlite3_stmt *pNext;
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(pDb) ){
(void)SQLITE_MISUSE_BKPT;
return 0;
}
#endif
sqlite3_mutex_enter(pDb->mutex);
if( pStmt==0 ){
pNext = (sqlite3_stmt*)pDb->pVdbe;
}else{
pNext = (sqlite3_stmt*)((Vdbe*)pStmt)->pNext;
}
sqlite3_mutex_leave(pDb->mutex);
return pNext;
}
/*
** This routine sets the progress callback for an Sqlite database to the
** given callback function with the given argument. The progress callback will
** be invoked every nOps opcodes.
*/
void sqlite3_progress_handler(
sqlite3 *db,
int nOps,
int (*xProgress)(void*),
void *pArg
){
if( sqlite3SafetyCheckOk(db) ){
sqlite3_mutex_enter(db->mutex);
if( nOps>0 ){
db->xProgress = xProgress;
db->nProgressOps = nOps;
db->pProgressArg = pArg;
}else{
db->xProgress = 0;
db->nProgressOps = 0;
db->pProgressArg = 0;
}
sqlite3_mutex_leave(db->mutex);
}
}
/*
** Compile the UTF-16 encoded SQL statement zSql into a statement handle.
*/
static int sqlite3Prepare16(
sqlite3 *db, /* Database handle. */
const void *zSql, /* UTF-8 encoded SQL statement. */
int nBytes, /* Length of zSql in bytes. */
int saveSqlFlag, /* True to save SQL text into the sqlite3_stmt */
sqlite3_stmt **ppStmt, /* OUT: A pointer to the prepared statement */
const void **pzTail /* OUT: End of parsed string */
){
/* This function currently works by first transforming the UTF-16
** encoded string to UTF-8, then invoking sqlite3_prepare(). The
** tricky bit is figuring out the pointer to return in *pzTail.
*/
char *zSql8;
const char *zTail8 = 0;
int rc = SQLITE_OK;
assert( ppStmt );
*ppStmt = 0;
if( !sqlite3SafetyCheckOk(db) ){
return SQLITE_MISUSE;
}
sqlite3_mutex_enter(db->mutex);
zSql8 = sqlite3Utf16to8(db, zSql, nBytes);
if( zSql8 ){
rc = sqlite3LockAndPrepare(db, zSql8, -1, saveSqlFlag, 0, ppStmt, &zTail8);
}
if( zTail8 && pzTail ){
/* If sqlite3_prepare returns a tail pointer, we calculate the
** equivalent pointer into the UTF-16 string by counting the unicode
** characters between zSql8 and zTail8, and then returning a pointer
** the same number of characters into the UTF-16 string.
*/
int chars_parsed = sqlite3Utf8CharLen(zSql8, (int)(zTail8-zSql8));
*pzTail = (u8 *)zSql + sqlite3Utf16ByteLen(zSql, chars_parsed);
}
sqlite3DbFree(db, zSql8);
rc = sqlite3ApiExit(db, rc);
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** Execute SQL code.
** Return one of the SQLITE_ success/failure codes.
** Also write an error message into memory obtained from malloc() and make *pzErrMsg point to that message.
**
** If the SQL is a query, then for each row in the query result the xCallback() function is called.
** pArg becomes the first argument to xCallback().
** If xCallback=NULL then no callback is invoked, even for queries.
*/
int sqlite3_exec(
sqlite3 *db, /* The database on which the SQL executes */
const char *zSql, /* The SQL to be executed */
sqlite3_callback xCallback, /* Invoke this callback routine */
void *pArg, /* First argument to xCallback() */
char **pzErrMsg /* Write error messages here */
){
int rc = SQLITE_OK; /* Return code */
const char *zLeftover; /* Tail of unprocessed SQL */
sqlite3_stmt *pStmt = 0; /* The current SQL statement */
char **azCols = 0; /* Names of result columns */
int callbackIsInit; /* True if callback data is initialized */
if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
if( zSql==0 ) zSql = "";
sqlite3_mutex_enter(db->mutex);
sqlite3Error(db, SQLITE_OK);
while( rc==SQLITE_OK && zSql[0] ){
int nCol;
char **azVals = 0;
pStmt = 0;
rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, &zLeftover);
assert( rc==SQLITE_OK || pStmt==0 );
if( rc!=SQLITE_OK ){
continue;
}
if( !pStmt ){
/* this happens for a comment or white-space */
zSql = zLeftover;
continue;
}
callbackIsInit = 0;
nCol = sqlite3_column_count(pStmt);
while( 1 ){
int i;
rc = sqlite3_step(pStmt);
/* Invoke the callback function if required */
if( xCallback && (SQLITE_ROW==rc ||
(SQLITE_DONE==rc
&& !callbackIsInit
&& db->flags&SQLITE_NullCallback)) ){
if( !callbackIsInit ){
azCols = sqlite3DbMallocRaw(db, (2*nCol+1)*sizeof(const char*));
if( azCols==0 ){
goto exec_out;
}
for(i=0; i<nCol; i++){
azCols[i] = (char *)sqlite3_column_name(pStmt, i);
/* sqlite3VdbeSetColName() installs column names as UTF8
** strings so there is no way for sqlite3_column_name() to fail. */
assert( azCols[i]!=0 );
}
callbackIsInit = 1;
}
if( rc==SQLITE_ROW ){
azVals = &azCols[nCol];
for(i=0; i<nCol; i++){
azVals[i] = (char *)sqlite3_column_text(pStmt, i);
if( !azVals[i] && sqlite3_column_type(pStmt, i)!=SQLITE_NULL ){
sqlite3OomFault(db);
goto exec_out;
}
}
azVals[i] = 0;
}
if( xCallback(pArg, nCol, azVals, azCols) ){
/* EVIDENCE-OF: R-38229-40159 If the callback function to
** sqlite3_exec() returns non-zero, then sqlite3_exec() will
** return SQLITE_ABORT. */
rc = SQLITE_ABORT;
sqlite3VdbeFinalize((Vdbe *)pStmt);
pStmt = 0;
sqlite3Error(db, SQLITE_ABORT);
goto exec_out;
}
}
if( rc!=SQLITE_ROW ){
rc = sqlite3VdbeFinalize((Vdbe *)pStmt);
pStmt = 0;
zSql = zLeftover;
while( sqlite3Isspace(zSql[0]) ) zSql++;
break;
}
}
sqlite3DbFree(db, azCols);
azCols = 0;
}
exec_out:
if( pStmt ) sqlite3VdbeFinalize((Vdbe *)pStmt);
sqlite3DbFree(db, azCols);
rc = sqlite3ApiExit(db, rc);
if( rc!=SQLITE_OK && pzErrMsg ){
*pzErrMsg = sqlite3DbStrDup(0, sqlite3_errmsg(db));
if( *pzErrMsg==0 ){
rc = SQLITE_NOMEM_BKPT;
sqlite3Error(db, SQLITE_NOMEM);
}
}else if( pzErrMsg ){
*pzErrMsg = 0;
}
assert( (rc&db->errMask)==rc );
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** Execute SQL code. Return one of the SQLITE_ success/failure
** codes. Also write an error message into memory obtained from
** malloc() and make *pzErrMsg point to that message.
**
** If the SQL is a query, then for each row in the query result
** the xCallback() function is called. pArg becomes the first
** argument to xCallback(). If xCallback=NULL then no callback
** is invoked, even for queries.
*/
int sqlite3_exec(
sqlite3 *db, /* The database on which the SQL executes */
const char *zSql, /* The SQL to be executed */
sqlite3_callback xCallback, /* Invoke this callback routine */
void *pArg, /* First argument to xCallback() */
char **pzErrMsg /* Write error messages here */
){
int rc = SQLITE_OK; /* Return code */
const char *zLeftover; /* Tail of unprocessed SQL */
sqlite3_stmt *pStmt = 0; /* The current SQL statement */
char **azCols = 0; /* Names of result columns */
int nRetry = 0; /* Number of retry attempts */
int callbackIsInit; /* True if callback data is initialized */
if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
if( zSql==0 ) zSql = "";
#ifdef SQLITE_ENABLE_SQLRR
SRRecExec(db, zSql);
#endif
sqlite3_mutex_enter(db->mutex);
sqlite3Error(db, SQLITE_OK, 0);
while( (rc==SQLITE_OK || (rc==SQLITE_SCHEMA && (++nRetry)<2)) && zSql[0] ){
int nCol;
char **azVals = 0;
pStmt = 0;
rc = sqlite3_prepare(db, zSql, -1, &pStmt, &zLeftover);
assert( rc==SQLITE_OK || pStmt==0 );
if( rc!=SQLITE_OK ){
continue;
}
if( !pStmt ){
/* this happens for a comment or white-space */
zSql = zLeftover;
continue;
}
callbackIsInit = 0;
nCol = sqlite3_column_count(pStmt);
while( 1 ){
int i;
rc = sqlite3_step(pStmt);
/* Invoke the callback function if required */
if( xCallback && (SQLITE_ROW==rc ||
(SQLITE_DONE==rc && !callbackIsInit
&& db->flags&SQLITE_NullCallback)) ){
if( !callbackIsInit ){
azCols = sqlite3DbMallocZero(db, 2*nCol*sizeof(const char*) + 1);
if( azCols==0 ){
goto exec_out;
}
for(i=0; i<nCol; i++){
azCols[i] = (char *)sqlite3_column_name(pStmt, i);
/* sqlite3VdbeSetColName() installs column names as UTF8
** strings so there is no way for sqlite3_column_name() to fail. */
assert( azCols[i]!=0 );
}
callbackIsInit = 1;
}
if( rc==SQLITE_ROW ){
azVals = &azCols[nCol];
for(i=0; i<nCol; i++){
azVals[i] = (char *)sqlite3_column_text(pStmt, i);
if( !azVals[i] && sqlite3_column_type(pStmt, i)!=SQLITE_NULL ){
db->mallocFailed = 1;
goto exec_out;
}
}
}
if( xCallback(pArg, nCol, azVals, azCols) ){
rc = SQLITE_ABORT;
sqlite3VdbeFinalize((Vdbe *)pStmt);
pStmt = 0;
sqlite3Error(db, SQLITE_ABORT, 0);
goto exec_out;
}
}
if( rc!=SQLITE_ROW ){
rc = sqlite3VdbeFinalize((Vdbe *)pStmt);
pStmt = 0;
if( rc!=SQLITE_SCHEMA ){
nRetry = 0;
zSql = zLeftover;
while( sqlite3Isspace(zSql[0]) ) zSql++;
}
break;
}
}
sqlite3DbFree(db, azCols);
azCols = 0;
}
exec_out:
if( pStmt ) sqlite3VdbeFinalize((Vdbe *)pStmt);
sqlite3DbFree(db, azCols);
#ifdef SQLITE_ENABLE_SQLRR
SRRecExecEnd(db);
#endif
rc = sqlite3ApiExit(db, rc);
if( rc!=SQLITE_OK && ALWAYS(rc==sqlite3_errcode(db)) && pzErrMsg ){
int nErrMsg = 1 + sqlite3Strlen30(sqlite3_errmsg(db));
*pzErrMsg = sqlite3Malloc(nErrMsg);
if( *pzErrMsg ){
memcpy(*pzErrMsg, sqlite3_errmsg(db), nErrMsg);
}else{
rc = SQLITE_NOMEM;
sqlite3Error(db, SQLITE_NOMEM, 0);
}
}else if( pzErrMsg ){
*pzErrMsg = 0;
}
assert( (rc&db->errMask)==rc );
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** Create an sqlite3_backup process to copy the contents of zSrcDb from
** connection handle pSrcDb to zDestDb in pDestDb. If successful, return
** a pointer to the new sqlite3_backup object.
**
** If an error occurs, NULL is returned and an error code and error message
** stored in database handle pDestDb.
*/
sqlite3_backup *sqlite3_backup_init(
sqlite3* pDestDb, /* Database to write to */
const char *zDestDb, /* Name of database within pDestDb */
sqlite3* pSrcDb, /* Database connection to read from */
const char *zSrcDb /* Name of database within pSrcDb */
){
sqlite3_backup *p; /* Value to return */
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(pSrcDb)||!sqlite3SafetyCheckOk(pDestDb) ){
(void)SQLITE_MISUSE_BKPT;
return 0;
}
#endif
/* BEGIN SQLCIPHER */
#ifdef SQLITE_HAS_CODEC
{
extern int sqlcipher_find_db_index(sqlite3*, const char*);
extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);
int srcNKey, destNKey;
void *zKey;
sqlite3CodecGetKey(pSrcDb, sqlcipher_find_db_index(pSrcDb, zSrcDb), &zKey, &srcNKey);
sqlite3CodecGetKey(pDestDb, sqlcipher_find_db_index(pDestDb, zDestDb), &zKey, &destNKey);
zKey = NULL;
if(srcNKey || destNKey) {
sqlite3ErrorWithMsg(pDestDb, SQLITE_ERROR, "backup is not supported with encrypted databases");
return NULL;
}
}
#endif
/* END SQLCIPHER */
/* Lock the source database handle. The destination database
** handle is not locked in this routine, but it is locked in
** sqlite3_backup_step(). The user is required to ensure that no
** other thread accesses the destination handle for the duration
** of the backup operation. Any attempt to use the destination
** database connection while a backup is in progress may cause
** a malfunction or a deadlock.
*/
sqlite3_mutex_enter(pSrcDb->mutex);
sqlite3_mutex_enter(pDestDb->mutex);
if( pSrcDb==pDestDb ){
sqlite3ErrorWithMsg(
pDestDb, SQLITE_ERROR, "source and destination must be distinct"
);
p = 0;
}else {
/* Allocate space for a new sqlite3_backup object...
** EVIDENCE-OF: R-64852-21591 The sqlite3_backup object is created by a
** call to sqlite3_backup_init() and is destroyed by a call to
** sqlite3_backup_finish(). */
p = (sqlite3_backup *)sqlite3MallocZero(sizeof(sqlite3_backup));
if( !p ){
sqlite3Error(pDestDb, SQLITE_NOMEM_BKPT);
}
}
/* If the allocation succeeded, populate the new object. */
if( p ){
p->pSrc = findBtree(pDestDb, pSrcDb, zSrcDb);
p->pDest = findBtree(pDestDb, pDestDb, zDestDb);
p->pDestDb = pDestDb;
p->pSrcDb = pSrcDb;
p->iNext = 1;
p->isAttached = 0;
if( 0==p->pSrc || 0==p->pDest
|| checkReadTransaction(pDestDb, p->pDest)!=SQLITE_OK
){
/* One (or both) of the named databases did not exist or an OOM
** error was hit. Or there is a transaction open on the destination
** database. The error has already been written into the pDestDb
** handle. All that is left to do here is free the sqlite3_backup
** structure. */
sqlite3_free(p);
p = 0;
}
}
if( p ){
p->pSrc->nBackup++;
}
sqlite3_mutex_leave(pDestDb->mutex);
sqlite3_mutex_leave(pSrcDb->mutex);
return p;
}
/*
** Query status information for a single database connection
*/
int sqlite3_db_status(
sqlite3 *db, /* The database connection whose status is desired */
int op, /* Status verb */
int *pCurrent, /* Write current value here */
int *pHighwater, /* Write high-water mark here */
int resetFlag /* Reset high-water mark if true */
){
int rc = SQLITE_OK; /* Return code */
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) || pCurrent==0|| pHighwater==0 ){
return SQLITE_MISUSE_BKPT;
}
#endif
sqlite3_mutex_enter(db->mutex);
switch( op ){
case SQLITE_DBSTATUS_LOOKASIDE_USED: {
*pCurrent = db->lookaside.nOut;
*pHighwater = db->lookaside.mxOut;
if( resetFlag ){
db->lookaside.mxOut = db->lookaside.nOut;
}
break;
}
case SQLITE_DBSTATUS_LOOKASIDE_HIT:
case SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE:
case SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL: {
testcase( op==SQLITE_DBSTATUS_LOOKASIDE_HIT );
testcase( op==SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE );
testcase( op==SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL );
assert( (op-SQLITE_DBSTATUS_LOOKASIDE_HIT)>=0 );
assert( (op-SQLITE_DBSTATUS_LOOKASIDE_HIT)<3 );
*pCurrent = 0;
*pHighwater = db->lookaside.anStat[op - SQLITE_DBSTATUS_LOOKASIDE_HIT];
if( resetFlag ){
db->lookaside.anStat[op - SQLITE_DBSTATUS_LOOKASIDE_HIT] = 0;
}
break;
}
/*
** Return an approximation for the amount of memory currently used
** by all pagers associated with the given database connection. The
** highwater mark is meaningless and is returned as zero.
*/
case SQLITE_DBSTATUS_CACHE_USED_SHARED:
case SQLITE_DBSTATUS_CACHE_USED: {
int totalUsed = 0;
int i;
sqlite3BtreeEnterAll(db);
for(i=0; i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
Pager *pPager = sqlite3BtreePager(pBt);
int nByte = sqlite3PagerMemUsed(pPager);
if( op==SQLITE_DBSTATUS_CACHE_USED_SHARED ){
nByte = nByte / sqlite3BtreeConnectionCount(pBt);
}
totalUsed += nByte;
}
}
sqlite3BtreeLeaveAll(db);
*pCurrent = totalUsed;
*pHighwater = 0;
break;
}
/*
** *pCurrent gets an accurate estimate of the amount of memory used
** to store the schema for all databases (main, temp, and any ATTACHed
** databases. *pHighwater is set to zero.
*/
case SQLITE_DBSTATUS_SCHEMA_USED: {
int i; /* Used to iterate through schemas */
int nByte = 0; /* Used to accumulate return value */
sqlite3BtreeEnterAll(db);
db->pnBytesFreed = &nByte;
for(i=0; i<db->nDb; i++){
Schema *pSchema = db->aDb[i].pSchema;
if( ALWAYS(pSchema!=0) ){
HashElem *p;
nByte += sqlite3GlobalConfig.m.xRoundup(sizeof(HashElem)) * (
pSchema->tblHash.count
+ pSchema->trigHash.count
+ pSchema->idxHash.count
+ pSchema->fkeyHash.count
);
nByte += sqlite3_msize(pSchema->tblHash.ht);
nByte += sqlite3_msize(pSchema->trigHash.ht);
nByte += sqlite3_msize(pSchema->idxHash.ht);
nByte += sqlite3_msize(pSchema->fkeyHash.ht);
for(p=sqliteHashFirst(&pSchema->trigHash); p; p=sqliteHashNext(p)){
sqlite3DeleteTrigger(db, (Trigger*)sqliteHashData(p));
}
for(p=sqliteHashFirst(&pSchema->tblHash); p; p=sqliteHashNext(p)){
sqlite3DeleteTable(db, (Table *)sqliteHashData(p));
}
}
}
db->pnBytesFreed = 0;
sqlite3BtreeLeaveAll(db);
*pHighwater = 0;
*pCurrent = nByte;
break;
}
/*
** *pCurrent gets an accurate estimate of the amount of memory used
** to store all prepared statements.
** *pHighwater is set to zero.
*/
case SQLITE_DBSTATUS_STMT_USED: {
struct Vdbe *pVdbe; /* Used to iterate through VMs */
int nByte = 0; /* Used to accumulate return value */
db->pnBytesFreed = &nByte;
for(pVdbe=db->pVdbe; pVdbe; pVdbe=pVdbe->pNext){
sqlite3VdbeClearObject(db, pVdbe);
sqlite3DbFree(db, pVdbe);
}
db->pnBytesFreed = 0;
*pHighwater = 0; /* IMP: R-64479-57858 */
*pCurrent = nByte;
break;
}
/*
** Set *pCurrent to the total cache hits or misses encountered by all
** pagers the database handle is connected to. *pHighwater is always set
** to zero.
*/
case SQLITE_DBSTATUS_CACHE_HIT:
case SQLITE_DBSTATUS_CACHE_MISS:
case SQLITE_DBSTATUS_CACHE_WRITE:{
int i;
int nRet = 0;
assert( SQLITE_DBSTATUS_CACHE_MISS==SQLITE_DBSTATUS_CACHE_HIT+1 );
assert( SQLITE_DBSTATUS_CACHE_WRITE==SQLITE_DBSTATUS_CACHE_HIT+2 );
for(i=0; i<db->nDb; i++){
if( db->aDb[i].pBt ){
Pager *pPager = sqlite3BtreePager(db->aDb[i].pBt);
sqlite3PagerCacheStat(pPager, op, resetFlag, &nRet);
}
}
*pHighwater = 0; /* IMP: R-42420-56072 */
/* IMP: R-54100-20147 */
/* IMP: R-29431-39229 */
*pCurrent = nRet;
break;
}
/* Set *pCurrent to non-zero if there are unresolved deferred foreign
** key constraints. Set *pCurrent to zero if all foreign key constraints
** have been satisfied. The *pHighwater is always set to zero.
*/
case SQLITE_DBSTATUS_DEFERRED_FKS: {
*pHighwater = 0; /* IMP: R-11967-56545 */
*pCurrent = db->nDeferredImmCons>0 || db->nDeferredCons>0;
break;
}
default: {
rc = SQLITE_ERROR;
}
}
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** Return the serialization of a database
*/
unsigned char *sqlite3_serialize(
sqlite3 *db, /* The database connection */
const char *zSchema, /* Which database within the connection */
sqlite3_int64 *piSize, /* Write size here, if not NULL */
unsigned int mFlags /* Maybe SQLITE_SERIALIZE_NOCOPY */
){
MemFile *p;
int iDb;
Btree *pBt;
sqlite3_int64 sz;
int szPage = 0;
sqlite3_stmt *pStmt = 0;
unsigned char *pOut;
char *zSql;
int rc;
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) ){
(void)SQLITE_MISUSE_BKPT;
return 0;
}
#endif
if( zSchema==0 ) zSchema = db->aDb[0].zDbSName;
p = memdbFromDbSchema(db, zSchema);
iDb = sqlite3FindDbName(db, zSchema);
if( piSize ) *piSize = -1;
if( iDb<0 ) return 0;
if( p ){
if( piSize ) *piSize = p->sz;
if( mFlags & SQLITE_SERIALIZE_NOCOPY ){
pOut = p->aData;
}else{
pOut = sqlite3_malloc64( p->sz );
if( pOut ) memcpy(pOut, p->aData, p->sz);
}
return pOut;
}
pBt = db->aDb[iDb].pBt;
if( pBt==0 ) return 0;
szPage = sqlite3BtreeGetPageSize(pBt);
zSql = sqlite3_mprintf("PRAGMA \"%w\".page_count", zSchema);
rc = zSql ? sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0) : SQLITE_NOMEM;
sqlite3_free(zSql);
if( rc ) return 0;
rc = sqlite3_step(pStmt);
if( rc!=SQLITE_ROW ){
pOut = 0;
}else{
sz = sqlite3_column_int64(pStmt, 0)*szPage;
if( piSize ) *piSize = sz;
if( mFlags & SQLITE_SERIALIZE_NOCOPY ){
pOut = 0;
}else{
pOut = sqlite3_malloc64( sz );
if( pOut ){
int nPage = sqlite3_column_int(pStmt, 0);
Pager *pPager = sqlite3BtreePager(pBt);
int pgno;
for(pgno=1; pgno<=nPage; pgno++){
DbPage *pPage = 0;
unsigned char *pTo = pOut + szPage*(sqlite3_int64)(pgno-1);
rc = sqlite3PagerGet(pPager, pgno, (DbPage**)&pPage, 0);
if( rc==SQLITE_OK ){
memcpy(pTo, sqlite3PagerGetData(pPage), szPage);
}else{
memset(pTo, 0, szPage);
}
sqlite3PagerUnref(pPage);
}
}
}
}
sqlite3_finalize(pStmt);
return pOut;
}
int sqlite3_exec(
sqlite3 *db,
const char *zSql,
sqlite3_callback xCallback,
void *pArg,
char **pzErrMsg
){
int rc = SQLITE_OK;
const char *zLeftover;
sqlite3_stmt *pStmt = 0;
char **azCols = 0;
int nRetry = 0;
int callbackIsInit;
if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
if( zSql==0 ) zSql = "";
sqlite3_mutex_enter(db->mutex);
sqlite3Error(db, SQLITE_OK, 0);
while( (rc==SQLITE_OK || (rc==SQLITE_SCHEMA && (++nRetry)<2)) && zSql[0] ){
int nCol;
char **azVals = 0;
pStmt = 0;
rc = sqlite3_prepare(db, zSql, -1, &pStmt, &zLeftover);
assert( rc==SQLITE_OK || pStmt==0 );
if( rc!=SQLITE_OK ){
continue;
}
if( !pStmt ){
zSql = zLeftover;
continue;
}
callbackIsInit = 0;
nCol = sqlite3_column_count(pStmt);
while( 1 ){
int i;
rc = sqlite3_step(pStmt);
if( xCallback && (SQLITE_ROW==rc ||
(SQLITE_DONE==rc && !callbackIsInit
&& db->flags&SQLITE_NullCallback)) ){
if( !callbackIsInit ){
azCols = sqlite3DbMallocZero(db, 2*nCol*sizeof(const char*) + 1);
if( azCols==0 ){
goto exec_out;
}
for(i=0; i<nCol; i++){
azCols[i] = (char *)sqlite3_column_name(pStmt, i);
assert( azCols[i]!=0 );
}
callbackIsInit = 1;
}
if( rc==SQLITE_ROW ){
azVals = &azCols[nCol];
for(i=0; i<nCol; i++){
azVals[i] = (char *)sqlite3_column_text(pStmt, i);
if( !azVals[i] && sqlite3_column_type(pStmt, i)!=SQLITE_NULL ){
db->mallocFailed = 1;
goto exec_out;
}
}
}
if( xCallback(pArg, nCol, azVals, azCols) ){
rc = SQLITE_ABORT;
sqlite3VdbeFinalize((Vdbe *)pStmt);
pStmt = 0;
sqlite3Error(db, SQLITE_ABORT, 0);
goto exec_out;
}
}
if( rc!=SQLITE_ROW ){
rc = sqlite3VdbeFinalize((Vdbe *)pStmt);
pStmt = 0;
if( rc!=SQLITE_SCHEMA ){
nRetry = 0;
zSql = zLeftover;
while( sqlite3Isspace(zSql[0]) ) zSql++;
}
break;
}
}
sqlite3DbFree(db, azCols);
azCols = 0;
}
exec_out:
if( pStmt ) sqlite3VdbeFinalize((Vdbe *)pStmt);
sqlite3DbFree(db, azCols);
rc = sqlite3ApiExit(db, rc);
if( rc!=SQLITE_OK && ALWAYS(rc==sqlite3_errcode(db)) && pzErrMsg ){
int nErrMsg = 1 + sqlite3Strlen30(sqlite3_errmsg(db));
*pzErrMsg = sqlite3Malloc(nErrMsg);
if( *pzErrMsg ){
memcpy(*pzErrMsg, sqlite3_errmsg(db), nErrMsg);
}else{
rc = SQLITE_NOMEM;
sqlite3Error(db, SQLITE_NOMEM, 0);
}
}else if( pzErrMsg ){
*pzErrMsg = 0;
}
assert( (rc&db->errMask)==rc );
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** Query the database. But instead of invoking a callback for each row,
** malloc() for space to hold the result and return the entire results
** at the conclusion of the call.
**
** The result that is written to ***pazResult is held in memory obtained
** from malloc(). But the caller cannot free this memory directly.
** Instead, the entire table should be passed to sqlite3_free_table() when
** the calling procedure is finished using it.
*/
int sqlite3_get_table(
sqlite3 *db, /* The database on which the SQL executes */
const char *zSql, /* The SQL to be executed */
char ***pazResult, /* Write the result table here */
int *pnRow, /* Write the number of rows in the result here */
int *pnColumn, /* Write the number of columns of result here */
char **pzErrMsg /* Write error messages here */
){
int rc;
TabResult res;
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) || pazResult==0 ) return SQLITE_MISUSE_BKPT;
#endif
*pazResult = 0;
if( pnColumn ) *pnColumn = 0;
if( pnRow ) *pnRow = 0;
if( pzErrMsg ) *pzErrMsg = 0;
res.zErrMsg = 0;
res.nRow = 0;
res.nColumn = 0;
res.nData = 1;
res.nAlloc = 20;
res.rc = SQLITE_OK;
res.azResult = sqlite3_malloc64(sizeof(char*)*res.nAlloc );
if( res.azResult==0 ){
db->errCode = SQLITE_NOMEM;
return SQLITE_NOMEM_BKPT;
}
res.azResult[0] = 0;
rc = sqlite3_exec(db, zSql, sqlite3_get_table_cb, &res, pzErrMsg);
assert( sizeof(res.azResult[0])>= sizeof(res.nData) );
res.azResult[0] = SQLITE_INT_TO_PTR(res.nData);
if( (rc&0xff)==SQLITE_ABORT ){
sqlite3_free_table(&res.azResult[1]);
if( res.zErrMsg ){
if( pzErrMsg ){
sqlite3_free(*pzErrMsg);
*pzErrMsg = sqlite3_mprintf("%s",res.zErrMsg);
}
sqlite3_free(res.zErrMsg);
}
db->errCode = res.rc; /* Assume 32-bit assignment is atomic */
return res.rc;
}
sqlite3_free(res.zErrMsg);
if( rc!=SQLITE_OK ){
sqlite3_free_table(&res.azResult[1]);
return rc;
}
if( res.nAlloc>res.nData ){
char **azNew;
azNew = sqlite3_realloc64( res.azResult, sizeof(char*)*res.nData );
if( azNew==0 ){
sqlite3_free_table(&res.azResult[1]);
db->errCode = SQLITE_NOMEM;
return SQLITE_NOMEM_BKPT;
}
res.azResult = azNew;
}
*pazResult = &res.azResult[1];
if( pnColumn ) *pnColumn = res.nColumn;
if( pnRow ) *pnRow = res.nRow;
return rc;
}
/*
** This function is used to set the schema of a virtual table. It is only
** valid to call this function from within the xCreate() or xConnect() of a
** virtual table module.
*/
int sqlite3_declare_vtab(sqlite3 *db, const char *zCreateTable){
VtabCtx *pCtx;
Parse *pParse;
int rc = SQLITE_OK;
Table *pTab;
char *zErr = 0;
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) || zCreateTable==0 ){
return SQLITE_MISUSE_BKPT;
}
#endif
sqlite3_mutex_enter(db->mutex);
pCtx = db->pVtabCtx;
if( !pCtx || pCtx->bDeclared ){
sqlite3Error(db, SQLITE_MISUSE);
sqlite3_mutex_leave(db->mutex);
return SQLITE_MISUSE_BKPT;
}
pTab = pCtx->pTab;
assert( (pTab->tabFlags & TF_Virtual)!=0 );
pParse = sqlite3StackAllocZero(db, sizeof(*pParse));
if( pParse==0 ){
rc = SQLITE_NOMEM_BKPT;
}else{
pParse->declareVtab = 1;
pParse->db = db;
pParse->nQueryLoop = 1;
if( SQLITE_OK==sqlite3RunParser(pParse, zCreateTable, &zErr)
&& pParse->pNewTable
&& !db->mallocFailed
&& !pParse->pNewTable->pSelect
&& (pParse->pNewTable->tabFlags & TF_Virtual)==0
){
if( !pTab->aCol ){
Table *pNew = pParse->pNewTable;
Index *pIdx;
pTab->aCol = pNew->aCol;
pTab->nCol = pNew->nCol;
pTab->tabFlags |= pNew->tabFlags & (TF_WithoutRowid|TF_NoVisibleRowid);
pNew->nCol = 0;
pNew->aCol = 0;
assert( pTab->pIndex==0 );
if( !HasRowid(pNew) && pCtx->pVTable->pMod->pModule->xUpdate!=0 ){
rc = SQLITE_ERROR;
}
pIdx = pNew->pIndex;
if( pIdx ){
assert( pIdx->pNext==0 );
pTab->pIndex = pIdx;
pNew->pIndex = 0;
pIdx->pTable = pTab;
}
}
pCtx->bDeclared = 1;
}else{
sqlite3ErrorWithMsg(db, SQLITE_ERROR, (zErr ? "%s" : 0), zErr);
sqlite3DbFree(db, zErr);
rc = SQLITE_ERROR;
}
pParse->declareVtab = 0;
if( pParse->pVdbe ){
sqlite3VdbeFinalize(pParse->pVdbe);
}
sqlite3DeleteTable(db, pParse->pNewTable);
sqlite3ParserReset(pParse);
sqlite3StackFree(db, pParse);
}
assert( (rc&0xff)==rc );
rc = sqlite3ApiExit(db, rc);
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** Cause any pending operation to stop at its earliest opportunity.
*/
void sqlite3_interrupt(sqlite3 *db){
if( sqlite3SafetyCheckOk(db) ){
db->u1.isInterrupted = 1;
}
}
/*
** Open a blob handle.
*/
int sqlite3_blob_open(
sqlite3* db, /* The database connection */
const char *zDb, /* The attached database containing the blob */
const char *zTable, /* The table containing the blob */
const char *zColumn, /* The column containing the blob */
sqlite_int64 iRow, /* The row containing the glob */
int flags, /* True -> read/write access, false -> read-only */
sqlite3_blob **ppBlob /* Handle for accessing the blob returned here */
){
int nAttempt = 0;
int iCol; /* Index of zColumn in row-record */
/* This VDBE program seeks a btree cursor to the identified
** db/table/row entry. The reason for using a vdbe program instead
** of writing code to use the b-tree layer directly is that the
** vdbe program will take advantage of the various transaction,
** locking and error handling infrastructure built into the vdbe.
**
** After seeking the cursor, the vdbe executes an OP_ResultRow.
** Code external to the Vdbe then "borrows" the b-tree cursor and
** uses it to implement the blob_read(), blob_write() and
** blob_bytes() functions.
**
** The sqlite3_blob_close() function finalizes the vdbe program,
** which closes the b-tree cursor and (possibly) commits the
** transaction.
*/
static const int iLn = VDBE_OFFSET_LINENO(4);
static const VdbeOpList openBlob[] = {
/* {OP_Transaction, 0, 0, 0}, // 0: Inserted separately */
{OP_TableLock, 0, 0, 0}, /* 1: Acquire a read or write lock */
/* One of the following two instructions is replaced by an OP_Noop. */
{OP_OpenRead, 0, 0, 0}, /* 2: Open cursor 0 for reading */
{OP_OpenWrite, 0, 0, 0}, /* 3: Open cursor 0 for read/write */
{OP_Variable, 1, 1, 1}, /* 4: Push the rowid to the stack */
{OP_NotExists, 0, 10, 1}, /* 5: Seek the cursor */
{OP_Column, 0, 0, 1}, /* 6 */
{OP_ResultRow, 1, 0, 0}, /* 7 */
{OP_Goto, 0, 4, 0}, /* 8 */
{OP_Close, 0, 0, 0}, /* 9 */
{OP_Halt, 0, 0, 0}, /* 10 */
};
int rc = SQLITE_OK;
char *zErr = 0;
Table *pTab;
Parse *pParse = 0;
Incrblob *pBlob = 0;
#ifdef SQLITE_ENABLE_API_ARMOR
if( ppBlob==0 ){
return SQLITE_MISUSE_BKPT;
}
#endif
*ppBlob = 0;
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) || zTable==0 ){
return SQLITE_MISUSE_BKPT;
}
#endif
flags = !!flags; /* flags = (flags ? 1 : 0); */
sqlite3_mutex_enter(db->mutex);
pBlob = (Incrblob *)sqlite3DbMallocZero(db, sizeof(Incrblob));
if( !pBlob ) goto blob_open_out;
pParse = sqlite3StackAllocRaw(db, sizeof(*pParse));
if( !pParse ) goto blob_open_out;
do {
memset(pParse, 0, sizeof(Parse));
pParse->db = db;
sqlite3DbFree(db, zErr);
zErr = 0;
sqlite3BtreeEnterAll(db);
pTab = sqlite3LocateTable(pParse, 0, zTable, zDb);
if( pTab && IsVirtual(pTab) ){
pTab = 0;
sqlite3ErrorMsg(pParse, "cannot open virtual table: %s", zTable);
}
if( pTab && !HasRowid(pTab) ){
pTab = 0;
sqlite3ErrorMsg(pParse, "cannot open table without rowid: %s", zTable);
}
#ifndef SQLITE_OMIT_VIEW
if( pTab && pTab->pSelect ){
pTab = 0;
sqlite3ErrorMsg(pParse, "cannot open view: %s", zTable);
}
#endif
if( !pTab ){
if( pParse->zErrMsg ){
sqlite3DbFree(db, zErr);
zErr = pParse->zErrMsg;
pParse->zErrMsg = 0;
}
rc = SQLITE_ERROR;
sqlite3BtreeLeaveAll(db);
goto blob_open_out;
}
/* Now search pTab for the exact column. */
for(iCol=0; iCol<pTab->nCol; iCol++) {
if( sqlite3StrICmp(pTab->aCol[iCol].zName, zColumn)==0 ){
break;
}
}
if( iCol==pTab->nCol ){
sqlite3DbFree(db, zErr);
zErr = sqlite3MPrintf(db, "no such column: \"%s\"", zColumn);
rc = SQLITE_ERROR;
sqlite3BtreeLeaveAll(db);
goto blob_open_out;
}
/* If the value is being opened for writing, check that the
** column is not indexed, and that it is not part of a foreign key.
** It is against the rules to open a column to which either of these
** descriptions applies for writing. */
if( flags ){
const char *zFault = 0;
SIndex *pIdx;
#ifndef SQLITE_OMIT_FOREIGN_KEY
if( db->flags&SQLITE_ForeignKeys ){
/* Check that the column is not part of an FK child key definition. It
** is not necessary to check if it is part of a parent key, as parent
** key columns must be indexed. The check below will pick up this
** case. */
FKey *pFKey;
for(pFKey=pTab->pFKey; pFKey; pFKey=pFKey->pNextFrom){
int j;
for(j=0; j<pFKey->nCol; j++){
if( pFKey->aCol[j].iFrom==iCol ){
zFault = "foreign key";
}
}
}
}
#endif
for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
int j;
for(j=0; j<pIdx->nKeyCol; j++){
/* FIXME: Be smarter about indexes that use expressions */
if( pIdx->aiColumn[j]==iCol || pIdx->aiColumn[j]==XN_EXPR ){
zFault = "indexed";
}
}
}
if( zFault ){
sqlite3DbFree(db, zErr);
zErr = sqlite3MPrintf(db, "cannot open %s column for writing", zFault);
rc = SQLITE_ERROR;
sqlite3BtreeLeaveAll(db);
goto blob_open_out;
}
}
pBlob->pStmt = (sqlite3_stmt *)sqlite3VdbeCreate(pParse);
assert( pBlob->pStmt || db->mallocFailed );
if( pBlob->pStmt ){
Vdbe *v = (Vdbe *)pBlob->pStmt;
int iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
sqlite3VdbeAddOp4Int(v, OP_Transaction, iDb, flags,
pTab->pSchema->schema_cookie,
pTab->pSchema->iGeneration);
sqlite3VdbeChangeP5(v, 1);
sqlite3VdbeAddOpList(v, ArraySize(openBlob), openBlob, iLn);
/* Make sure a mutex is held on the table to be accessed */
sqlite3VdbeUsesBtree(v, iDb);
/* Configure the OP_TableLock instruction */
#ifdef SQLITE_OMIT_SHARED_CACHE
sqlite3VdbeChangeToNoop(v, 1);
#else
sqlite3VdbeChangeP1(v, 1, iDb);
sqlite3VdbeChangeP2(v, 1, pTab->tnum);
sqlite3VdbeChangeP3(v, 1, flags);
sqlite3VdbeChangeP4(v, 1, pTab->zName, P4_TRANSIENT);
#endif
/* Remove either the OP_OpenWrite or OpenRead. Set the P2
** parameter of the other to pTab->tnum. */
sqlite3VdbeChangeToNoop(v, 3 - flags);
sqlite3VdbeChangeP2(v, 2 + flags, pTab->tnum);
sqlite3VdbeChangeP3(v, 2 + flags, iDb);
/* Configure the number of columns. Configure the cursor to
** think that the table has one more column than it really
** does. An OP_Column to retrieve this imaginary column will
** always return an SQL NULL. This is useful because it means
** we can invoke OP_Column to fill in the vdbe cursors type
** and offset cache without causing any IO.
*/
sqlite3VdbeChangeP4(v, 2+flags, SQLITE_INT_TO_PTR(pTab->nCol+1),P4_INT32);
sqlite3VdbeChangeP2(v, 6, pTab->nCol);
if( !db->mallocFailed ){
pParse->nVar = 1;
pParse->nMem = 1;
pParse->nTab = 1;
sqlite3VdbeMakeReady(v, pParse);
}
}
pBlob->flags = flags;
pBlob->iCol = iCol;
pBlob->db = db;
sqlite3BtreeLeaveAll(db);
if( db->mallocFailed ){
goto blob_open_out;
}
sqlite3_bind_int64(pBlob->pStmt, 1, iRow);
rc = blobSeekToRow(pBlob, iRow, &zErr);
} while( (++nAttempt)<SQLITE_MAX_SCHEMA_RETRY && rc==SQLITE_SCHEMA );
blob_open_out:
if( rc==SQLITE_OK && db->mallocFailed==0 ){
*ppBlob = (sqlite3_blob *)pBlob;
}else{
if( pBlob && pBlob->pStmt ) sqlite3VdbeFinalize((Vdbe *)pBlob->pStmt);
sqlite3DbFree(db, pBlob);
}
sqlite3ErrorWithMsg(db, rc, (zErr ? "%s" : 0), zErr);
sqlite3DbFree(db, zErr);
sqlite3ParserReset(pParse);
sqlite3StackFree(db, pParse);
rc = sqlite3ApiExit(db, rc);
sqlite3_mutex_leave(db->mutex);
return rc;
}