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Overview
| Comment: | Changes to savepoint in virtual tables for simpler and more consistent operation. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
92f26a8b8f18832cb1f8ba7dd8e5b020 |
| User & Date: | drh 2011-05-25 01:16:42 |
Context
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2011-05-25
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| 15:54 | Fix a compiler warning. check-in: 6df99e52 user: drh tags: trunk | |
| 01:16 | Changes to savepoint in virtual tables for simpler and more consistent operation. check-in: 92f26a8b user: drh tags: trunk | |
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2011-05-24
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| 15:36 | Do not invoke the xRollbackTo or xRelease methods of a virtual table without having first invoked an appropriate xSavepoint method. Add assert() statements to FTS3/4 to verify that this is happening in all cases. check-in: 651ef242 user: drh tags: trunk | |
Changes
Changes to ext/fts3/fts3.c.
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TESTONLY( p->mxSavepoint = iSavepoint );
return sqlite3Fts3PendingTermsFlush(p);
}
static int fts3ReleaseMethod(sqlite3_vtab *pVtab, int iSavepoint){
TESTONLY( Fts3Table *p = (Fts3Table*)pVtab );
assert( p->inTransaction );
assert( p->mxSavepoint >= iSavepoint );
TESTONLY( p->mxSavepoint = iSavepoint>0 ? iSavepoint-1 : 0 );
return SQLITE_OK;
}
static int fts3RollbackToMethod(sqlite3_vtab *pVtab, int iSavepoint){
Fts3Table *p = (Fts3Table*)pVtab;
assert( p->inTransaction );
assert( p->mxSavepoint >= iSavepoint );
TESTONLY( p->mxSavepoint = iSavepoint );
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TESTONLY( p->mxSavepoint = iSavepoint );
return sqlite3Fts3PendingTermsFlush(p);
}
static int fts3ReleaseMethod(sqlite3_vtab *pVtab, int iSavepoint){
TESTONLY( Fts3Table *p = (Fts3Table*)pVtab );
assert( p->inTransaction );
assert( p->mxSavepoint >= iSavepoint );
TESTONLY( p->mxSavepoint = iSavepoint-1 );
return SQLITE_OK;
}
static int fts3RollbackToMethod(sqlite3_vtab *pVtab, int iSavepoint){
Fts3Table *p = (Fts3Table*)pVtab;
assert( p->inTransaction );
assert( p->mxSavepoint >= iSavepoint );
TESTONLY( p->mxSavepoint = iSavepoint );
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Changes to src/sqliteInt.h.
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*/
struct VTable {
sqlite3 *db; /* Database connection associated with this table */
Module *pMod; /* Pointer to module implementation */
sqlite3_vtab *pVtab; /* Pointer to vtab instance */
int nRef; /* Number of pointers to this structure */
u8 bConstraint; /* True if constraints are supported */
u8 bInSavepoint; /* True if within a SAVEPOINT */
VTable *pNext; /* Next in linked list (see above) */
};
/*
** Each SQL table is represented in memory by an instance of the
** following structure.
**
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*/
struct VTable {
sqlite3 *db; /* Database connection associated with this table */
Module *pMod; /* Pointer to module implementation */
sqlite3_vtab *pVtab; /* Pointer to vtab instance */
int nRef; /* Number of pointers to this structure */
u8 bConstraint; /* True if constraints are supported */
u32 iSavepoint; /* Depth of the SAVEPOINT stack */
VTable *pNext; /* Next in linked list (see above) */
};
/*
** Each SQL table is represented in memory by an instance of the
** following structure.
**
|
Changes to src/vdbe.c.
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assert( sqlite3BtreeIsInTrans(pBt) );
if( p->iStatement==0 ){
assert( db->nStatement>=0 && db->nSavepoint>=0 );
db->nStatement++;
p->iStatement = db->nSavepoint + db->nStatement;
}
rc = sqlite3VtabSavepoint(db, SAVEPOINT_BEGIN, p->iStatement);
if( rc==SQLITE_OK ){
rc = sqlite3BtreeBeginStmt(pBt, p->iStatement);
}
/* Store the current value of the database handles deferred constraint
** counter. If the statement transaction needs to be rolled back,
** the value of this counter needs to be restored too. */
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assert( sqlite3BtreeIsInTrans(pBt) );
if( p->iStatement==0 ){
assert( db->nStatement>=0 && db->nSavepoint>=0 );
db->nStatement++;
p->iStatement = db->nSavepoint + db->nStatement;
}
rc = sqlite3VtabSavepoint(db, SAVEPOINT_BEGIN, p->iStatement-1);
if( rc==SQLITE_OK ){
rc = sqlite3BtreeBeginStmt(pBt, p->iStatement);
}
/* Store the current value of the database handles deferred constraint
** counter. If the statement transaction needs to be rolled back,
** the value of this counter needs to be restored too. */
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Changes to src/vdbeaux.c.
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}
/* If eStatementOp is non-zero, then a statement transaction needs to
** be committed or rolled back. Call sqlite3VdbeCloseStatement() to
** do so. If this operation returns an error, and the current statement
** error code is SQLITE_OK or SQLITE_CONSTRAINT, then promote the
** current statement error code.
**
** Note that sqlite3VdbeCloseStatement() can only fail if eStatementOp
** is SAVEPOINT_ROLLBACK. But if p->rc==SQLITE_OK then eStatementOp
** must be SAVEPOINT_RELEASE. Hence the NEVER(p->rc==SQLITE_OK) in
** the following code.
*/
if( eStatementOp ){
rc = sqlite3VdbeCloseStatement(p, eStatementOp);
if( rc ){
assert( eStatementOp==SAVEPOINT_ROLLBACK );
if( NEVER(p->rc==SQLITE_OK) || p->rc==SQLITE_CONSTRAINT ){
p->rc = rc;
sqlite3DbFree(db, p->zErrMsg);
p->zErrMsg = 0;
}
invalidateCursorsOnModifiedBtrees(db);
sqlite3RollbackAll(db);
sqlite3CloseSavepoints(db);
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}
/* If eStatementOp is non-zero, then a statement transaction needs to
** be committed or rolled back. Call sqlite3VdbeCloseStatement() to
** do so. If this operation returns an error, and the current statement
** error code is SQLITE_OK or SQLITE_CONSTRAINT, then promote the
** current statement error code.
*/
if( eStatementOp ){
rc = sqlite3VdbeCloseStatement(p, eStatementOp);
if( rc ){
if( p->rc==SQLITE_OK || p->rc==SQLITE_CONSTRAINT ){
p->rc = rc;
sqlite3DbFree(db, p->zErrMsg);
p->zErrMsg = 0;
}
invalidateCursorsOnModifiedBtrees(db);
sqlite3RollbackAll(db);
sqlite3CloseSavepoints(db);
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Changes to src/vtab.c.
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VTable *pVTab = db->aVTrans[i];
sqlite3_vtab *p = pVTab->pVtab;
if( p ){
int (*x)(sqlite3_vtab *);
x = *(int (**)(sqlite3_vtab *))((char *)p->pModule + offset);
if( x ) x(p);
}
sqlite3VtabUnlock(pVTab);
}
sqlite3DbFree(db, db->aVTrans);
db->nVTrans = 0;
db->aVTrans = 0;
}
}
................................................................................
** function immediately. If all calls to virtual table methods are successful,
** SQLITE_OK is returned.
*/
int sqlite3VtabSavepoint(sqlite3 *db, int op, int iSavepoint){
int rc = SQLITE_OK;
assert( op==SAVEPOINT_RELEASE||op==SAVEPOINT_ROLLBACK||op==SAVEPOINT_BEGIN );
if( db->aVTrans ){
int i;
for(i=0; rc==SQLITE_OK && i<db->nVTrans; i++){
VTable *pVTab = db->aVTrans[i];
const sqlite3_module *pMod = pVTab->pMod->pModule;
if( pMod->iVersion>=2 && (pVTab->bInSavepoint || op==SAVEPOINT_BEGIN) ){
int (*xMethod)(sqlite3_vtab *, int);
switch( op ){
case SAVEPOINT_BEGIN:
xMethod = pMod->xSavepoint;
pVTab->bInSavepoint = 1;
break;
case SAVEPOINT_ROLLBACK:
xMethod = pMod->xRollbackTo;
break;
default:
xMethod = pMod->xRelease;
break;
}
if( xMethod ) rc = xMethod(db->aVTrans[i]->pVtab, iSavepoint);
}
}
}
return rc;
}
/*
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VTable *pVTab = db->aVTrans[i];
sqlite3_vtab *p = pVTab->pVtab;
if( p ){
int (*x)(sqlite3_vtab *);
x = *(int (**)(sqlite3_vtab *))((char *)p->pModule + offset);
if( x ) x(p);
}
pVTab->iSavepoint = 0;
sqlite3VtabUnlock(pVTab);
}
sqlite3DbFree(db, db->aVTrans);
db->nVTrans = 0;
db->aVTrans = 0;
}
}
................................................................................
** function immediately. If all calls to virtual table methods are successful,
** SQLITE_OK is returned.
*/
int sqlite3VtabSavepoint(sqlite3 *db, int op, int iSavepoint){
int rc = SQLITE_OK;
assert( op==SAVEPOINT_RELEASE||op==SAVEPOINT_ROLLBACK||op==SAVEPOINT_BEGIN );
assert( iSavepoint>=0 );
if( db->aVTrans ){
int i;
for(i=0; rc==SQLITE_OK && i<db->nVTrans; i++){
VTable *pVTab = db->aVTrans[i];
const sqlite3_module *pMod = pVTab->pMod->pModule;
if( pMod->iVersion>=2 ){
int (*xMethod)(sqlite3_vtab *, int);
switch( op ){
case SAVEPOINT_BEGIN:
xMethod = pMod->xSavepoint;
pVTab->iSavepoint = iSavepoint+1;
break;
case SAVEPOINT_ROLLBACK:
xMethod = pMod->xRollbackTo;
break;
default:
xMethod = pMod->xRelease;
break;
}
if( xMethod && pVTab->iSavepoint>iSavepoint ){
rc = xMethod(db->aVTrans[i]->pVtab, iSavepoint);
}
}
}
}
return rc;
}
/*
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