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Overview
| Comment: | Ensure randomly generated rowids never go negative. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 631423677bd7043e99987edc633005443125181c |
| User & Date: | shaneh 2010-09-01 02:37:56 |
Context
|
2010-09-01
| ||
| 02:38 | Fix some compiler warnings under MSVC. check-in: afdc82a9 user: shaneh tags: trunk | |
| 02:37 | Ensure randomly generated rowids never go negative. check-in: 63142367 user: shaneh tags: trunk | |
|
2010-08-31
| ||
| 16:25 | Do not clear the internal "schema has changed" flag when performing a savepoint rollback. The schema changes may not have taken place within the savepoint being rolled back. check-in: c2a84430 user: dan tags: trunk | |
Changes
Changes to src/vdbe.c.
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/* IMPLEMENTATION-OF: R-48598-02938 If the largest ROWID is equal to the
** largest possible integer (9223372036854775807) then the database
** engine starts picking candidate ROWIDs at random until it finds one
** that is not previously used.
*/
assert( pOp->p3==0 ); /* We cannot be in random rowid mode if this is
** an AUTOINCREMENT table. */
v = db->lastRowid;
cnt = 0;
do{
if( cnt==0 && (v&0xffffff)==v ){
v++;
}else{
sqlite3_randomness(sizeof(v), &v);
if( cnt<5 ) v &= 0xffffff;
}
rc = sqlite3BtreeMovetoUnpacked(pC->pCursor, 0, (u64)v, 0, &res);
cnt++;
}while( cnt<100 && rc==SQLITE_OK && res==0 );
if( rc==SQLITE_OK && res==0 ){
rc = SQLITE_FULL; /* IMP: R-38219-53002 */
goto abort_due_to_error;
}
}
pC->rowidIsValid = 0;
pC->deferredMoveto = 0;
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/* IMPLEMENTATION-OF: R-48598-02938 If the largest ROWID is equal to the
** largest possible integer (9223372036854775807) then the database
** engine starts picking candidate ROWIDs at random until it finds one
** that is not previously used.
*/
assert( pOp->p3==0 ); /* We cannot be in random rowid mode if this is
** an AUTOINCREMENT table. */
/* on the first attempt, simply do one more than previous */
v = db->lastRowid;
v &= (MAX_ROWID>>1); /* ensure doesn't go negative */
v++; /* ensure non-zero */
cnt = 0;
while( ((rc = sqlite3BtreeMovetoUnpacked(pC->pCursor, 0, (u64)v, 0, &res))==SQLITE_OK)
&& (res==0)
&& (++cnt<100)){
/* collision - try another random rowid */
sqlite3_randomness(sizeof(v), &v);
if( cnt<5 ){
/* try "small" random rowids for the initial attempts */
v &= 0xffffff;
}else{
v &= (MAX_ROWID>>1); /* ensure doesn't go negative */
}
v++; /* ensure non-zero */
}
if( rc==SQLITE_OK && res==0 ){
rc = SQLITE_FULL; /* IMP: R-38219-53002 */
goto abort_due_to_error;
}
}
pC->rowidIsValid = 0;
pC->deferredMoveto = 0;
|