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Overview
| Comment: | Allow read transactions to be freely opened and closed by SQL statements run from within the implementation of user-functions if the user-function is called by a SELECT statement that does not access any database tables (e.g. "SELECT user_function();"). |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
f308c4851726b4b75636f714466f2314 |
| User & Date: | dan 2013-06-28 19:41:43 |
Context
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2013-06-28
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| 21:12 | Add the SQLITE_DEFAULT_AUTOMATIC_INDEX compile-time option, which if set to zero turns automatic indices off by default. Increase the estimated cost of an automatic index. Additional minor refactoring of the automatic index code. check-in: 459b3179 user: drh tags: trunk | |
| 19:41 | Allow read transactions to be freely opened and closed by SQL statements run from within the implementation of user-functions if the user-function is called by a SELECT statement that does not access any database tables (e.g. "SELECT user_function();"). check-in: f308c485 user: dan tags: trunk | |
| 17:29 | Add a bit to the SQLITE_TESTCTRL_OPTIMIZATIONS option for sqlite3_file_control() that will disable the use of SQLITE_STAT3 information in the query planner. check-in: 60c19b86 user: drh tags: trunk | |
Changes
Changes to src/btree.c.
3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 |
BtShared *pBt = p->pBt;
sqlite3 *db = p->db;
assert( sqlite3BtreeHoldsMutex(p) );
#ifndef SQLITE_OMIT_AUTOVACUUM
pBt->bDoTruncate = 0;
#endif
if( p->inTrans>TRANS_NONE && db->nVdbeActive>1 ){
/* If there are other active statements that belong to this database
** handle, downgrade to a read-only transaction. The other statements
** may still be reading from the database. */
downgradeAllSharedCacheTableLocks(p);
p->inTrans = TRANS_READ;
}else{
/* If the handle had any kind of transaction open, decrement the
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| |
3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 |
BtShared *pBt = p->pBt;
sqlite3 *db = p->db;
assert( sqlite3BtreeHoldsMutex(p) );
#ifndef SQLITE_OMIT_AUTOVACUUM
pBt->bDoTruncate = 0;
#endif
if( p->inTrans>TRANS_NONE && db->nVdbeRead>1 ){
/* If there are other active statements that belong to this database
** handle, downgrade to a read-only transaction. The other statements
** may still be reading from the database. */
downgradeAllSharedCacheTableLocks(p);
p->inTrans = TRANS_READ;
}else{
/* If the handle had any kind of transaction open, decrement the
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Changes to src/vdbe.c.
2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 .... 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 .... 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 .... 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 .... 5568 5569 5570 5571 5572 5573 5574 5575 5576 5577 5578 5579 5580 5581 5582 |
/* Assert that the p1 parameter is valid. Also that if there is no open
** transaction, then there cannot be any savepoints.
*/
assert( db->pSavepoint==0 || db->autoCommit==0 );
assert( p1==SAVEPOINT_BEGIN||p1==SAVEPOINT_RELEASE||p1==SAVEPOINT_ROLLBACK );
assert( db->pSavepoint || db->isTransactionSavepoint==0 );
assert( checkSavepointCount(db) );
if( p1==SAVEPOINT_BEGIN ){
if( db->nVdbeWrite>0 ){
/* A new savepoint cannot be created if there are active write
** statements (i.e. open read/write incremental blob handles).
*/
sqlite3SetString(&p->zErrMsg, db, "cannot open savepoint - "
................................................................................
desiredAutoCommit = pOp->p1;
iRollback = pOp->p2;
turnOnAC = desiredAutoCommit && !db->autoCommit;
assert( desiredAutoCommit==1 || desiredAutoCommit==0 );
assert( desiredAutoCommit==1 || iRollback==0 );
assert( db->nVdbeActive>0 ); /* At least this one VM is active */
#if 0
if( turnOnAC && iRollback && db->nVdbeActive>1 ){
/* If this instruction implements a ROLLBACK and other VMs are
** still running, and a transaction is active, return an error indicating
** that the other VMs must complete first.
*/
................................................................................
goto vdbe_return;
}
if( rc!=SQLITE_OK ){
goto abort_due_to_error;
}
if( pOp->p2 && p->usesStmtJournal
&& (db->autoCommit==0 || db->nVdbeActive>1)
){
assert( sqlite3BtreeIsInTrans(pBt) );
if( p->iStatement==0 ){
assert( db->nStatement>=0 && db->nSavepoint>=0 );
db->nStatement++;
p->iStatement = db->nSavepoint + db->nStatement;
}
................................................................................
Vdbe *pVdbe;
int iDb;
assert( p->readOnly==0 );
#ifndef SQLITE_OMIT_VIRTUALTABLE
iCnt = 0;
for(pVdbe=db->pVdbe; pVdbe; pVdbe = pVdbe->pNext){
if( pVdbe->magic==VDBE_MAGIC_RUN && pVdbe->inVtabMethod<2 && pVdbe->pc>=0 ){
iCnt++;
}
}
#else
iCnt = db->nVdbeActive;
#endif
pOut->flags = MEM_Null;
if( iCnt>1 ){
rc = SQLITE_LOCKED;
p->errorAction = OE_Abort;
}else{
iDb = pOp->p3;
................................................................................
){
eNew = eOld;
}
if( (eNew!=eOld)
&& (eOld==PAGER_JOURNALMODE_WAL || eNew==PAGER_JOURNALMODE_WAL)
){
if( !db->autoCommit || db->nVdbeActive>1 ){
rc = SQLITE_ERROR;
sqlite3SetString(&p->zErrMsg, db,
"cannot change %s wal mode from within a transaction",
(eNew==PAGER_JOURNALMODE_WAL ? "into" : "out of")
);
break;
}else{
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> > | > | > | | |
2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 .... 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 .... 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 .... 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 .... 5572 5573 5574 5575 5576 5577 5578 5579 5580 5581 5582 5583 5584 5585 5586 |
/* Assert that the p1 parameter is valid. Also that if there is no open ** transaction, then there cannot be any savepoints. */ assert( db->pSavepoint==0 || db->autoCommit==0 ); assert( p1==SAVEPOINT_BEGIN||p1==SAVEPOINT_RELEASE||p1==SAVEPOINT_ROLLBACK ); assert( db->pSavepoint || db->isTransactionSavepoint==0 ); assert( checkSavepointCount(db) ); assert( p->bIsReader ); if( p1==SAVEPOINT_BEGIN ){ if( db->nVdbeWrite>0 ){ /* A new savepoint cannot be created if there are active write ** statements (i.e. open read/write incremental blob handles). */ sqlite3SetString(&p->zErrMsg, db, "cannot open savepoint - " ................................................................................ desiredAutoCommit = pOp->p1; iRollback = pOp->p2; turnOnAC = desiredAutoCommit && !db->autoCommit; assert( desiredAutoCommit==1 || desiredAutoCommit==0 ); assert( desiredAutoCommit==1 || iRollback==0 ); assert( db->nVdbeActive>0 ); /* At least this one VM is active */ assert( p->bIsReader ); #if 0 if( turnOnAC && iRollback && db->nVdbeActive>1 ){ /* If this instruction implements a ROLLBACK and other VMs are ** still running, and a transaction is active, return an error indicating ** that the other VMs must complete first. */ ................................................................................ goto vdbe_return; } if( rc!=SQLITE_OK ){ goto abort_due_to_error; } if( pOp->p2 && p->usesStmtJournal && (db->autoCommit==0 || db->nVdbeRead>1) ){ assert( sqlite3BtreeIsInTrans(pBt) ); if( p->iStatement==0 ){ assert( db->nStatement>=0 && db->nSavepoint>=0 ); db->nStatement++; p->iStatement = db->nSavepoint + db->nStatement; } ................................................................................ Vdbe *pVdbe; int iDb; assert( p->readOnly==0 ); #ifndef SQLITE_OMIT_VIRTUALTABLE iCnt = 0; for(pVdbe=db->pVdbe; pVdbe; pVdbe = pVdbe->pNext){ if( pVdbe->magic==VDBE_MAGIC_RUN && pVdbe->bIsReader && pVdbe->inVtabMethod<2 && pVdbe->pc>=0 ){ iCnt++; } } #else iCnt = db->nVdbeRead; #endif pOut->flags = MEM_Null; if( iCnt>1 ){ rc = SQLITE_LOCKED; p->errorAction = OE_Abort; }else{ iDb = pOp->p3; ................................................................................ ){ eNew = eOld; } if( (eNew!=eOld) && (eOld==PAGER_JOURNALMODE_WAL || eNew==PAGER_JOURNALMODE_WAL) ){ if( !db->autoCommit || db->nVdbeRead>1 ){ rc = SQLITE_ERROR; sqlite3SetString(&p->zErrMsg, db, "cannot change %s wal mode from within a transaction", (eNew==PAGER_JOURNALMODE_WAL ? "into" : "out of") ); break; }else{ |
Changes to src/vdbeaux.c.
409 410 411 412 413 414 415 416 417 418 419 420 421 422 ... 443 444 445 446 447 448 449 450 451 452 453 454 455 456 .... 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 |
pOp->opflags = sqlite3OpcodeProperty[opcode];
if( opcode==OP_Function || opcode==OP_AggStep ){
if( pOp->p5>nMaxArgs ) nMaxArgs = pOp->p5;
}else if( opcode==OP_Transaction ){
if( pOp->p2!=0 ) p->readOnly = 0;
p->bIsReader = 1;
}else if( opcode==OP_Vacuum
|| opcode==OP_JournalMode
#ifndef SQLITE_OMIT_VIRTUALTABLE
|| opcode==OP_Checkpoint
#endif
){
p->readOnly = 0;
................................................................................
assert( -1-pOp->p2<p->nLabel );
pOp->p2 = aLabel[-1-pOp->p2];
}
}
sqlite3DbFree(p->db, p->aLabel);
p->aLabel = 0;
*pMaxFuncArgs = nMaxArgs;
}
/*
** Return the address of the next instruction to be inserted.
*/
int sqlite3VdbeCurrentAddr(Vdbe *p){
assert( p->magic==VDBE_MAGIC_INIT );
................................................................................
if( p->aOnceFlag ) memset(p->aOnceFlag, 0, p->nOnceFlag);
closeAllCursors(p);
if( p->magic!=VDBE_MAGIC_RUN ){
return SQLITE_OK;
}
checkActiveVdbeCnt(db);
/* No commit or rollback needed if the program never started */
if( p->pc>=0 ){
int mrc; /* Primary error code from p->rc */
int eStatementOp = 0;
int isSpecialError; /* Set to true if a 'special' error */
/* Lock all btrees used by the statement */
sqlite3VdbeEnter(p);
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> > > | > | |
409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 ... 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 .... 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 |
pOp->opflags = sqlite3OpcodeProperty[opcode];
if( opcode==OP_Function || opcode==OP_AggStep ){
if( pOp->p5>nMaxArgs ) nMaxArgs = pOp->p5;
}else if( opcode==OP_Transaction ){
if( pOp->p2!=0 ) p->readOnly = 0;
p->bIsReader = 1;
}else if( opcode==OP_AutoCommit || opcode==OP_Savepoint ){
p->bIsReader = 1;
}else if( opcode==OP_Vacuum
|| opcode==OP_JournalMode
#ifndef SQLITE_OMIT_VIRTUALTABLE
|| opcode==OP_Checkpoint
#endif
){
p->readOnly = 0;
................................................................................
assert( -1-pOp->p2<p->nLabel );
pOp->p2 = aLabel[-1-pOp->p2];
}
}
sqlite3DbFree(p->db, p->aLabel);
p->aLabel = 0;
*pMaxFuncArgs = nMaxArgs;
assert( p->bIsReader!=0 || p->btreeMask==0 );
}
/*
** Return the address of the next instruction to be inserted.
*/
int sqlite3VdbeCurrentAddr(Vdbe *p){
assert( p->magic==VDBE_MAGIC_INIT );
................................................................................
if( p->aOnceFlag ) memset(p->aOnceFlag, 0, p->nOnceFlag);
closeAllCursors(p);
if( p->magic!=VDBE_MAGIC_RUN ){
return SQLITE_OK;
}
checkActiveVdbeCnt(db);
/* No commit or rollback needed if the program never started or if the
** SQL statement does not read or write a database file. */
if( p->pc>=0 && p->bIsReader ){
int mrc; /* Primary error code from p->rc */
int eStatementOp = 0;
int isSpecialError; /* Set to true if a 'special' error */
/* Lock all btrees used by the statement */
sqlite3VdbeEnter(p);
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Changes to test/wal6.test.
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do_execsql_test 2.5 {
SELECT * FROM t1;
COMMIT;
INSERT INTO t1 VALUES('x', 'x')
} {1 one 2 two}
if 0 {
proc test3 {prefix} {
do_test $prefix.1 {
execsql { SELECT count(*) FROM t1 }
} {0}
do_test $prefix.2 {
execsql { INSERT INTO t1 VALUES('x', 'x') } db2
} {}
................................................................................
do_execsql_test 2.6.1 { DELETE FROM t1 }
test3 2.6.2
db func test3 test3
do_execsql_test 2.6.3 { DELETE FROM t1 }
db eval {SELECT test3('2.6.4')}
}
do_test 2.x {
db2 close
} {}
#-------------------------------------------------------------------------
# Check that if BEGIN IMMEDIATE fails, it does not leave the user with
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<
<
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do_execsql_test 2.5 {
SELECT * FROM t1;
COMMIT;
INSERT INTO t1 VALUES('x', 'x')
} {1 one 2 two}
proc test3 {prefix} {
do_test $prefix.1 {
execsql { SELECT count(*) FROM t1 }
} {0}
do_test $prefix.2 {
execsql { INSERT INTO t1 VALUES('x', 'x') } db2
} {}
................................................................................
do_execsql_test 2.6.1 { DELETE FROM t1 }
test3 2.6.2
db func test3 test3
do_execsql_test 2.6.3 { DELETE FROM t1 }
db eval {SELECT test3('2.6.4')}
do_test 2.x {
db2 close
} {}
#-------------------------------------------------------------------------
# Check that if BEGIN IMMEDIATE fails, it does not leave the user with
|