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Fix for [b1d3a2e531].

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FossilOrigin-Name: 3f3acee465a6e390301f9dc588dd1d8e0bd646bd
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dan
2011-08-22 09:54:26 +00:00
parent bd1e50c920
commit 3098dc5c8a
4 changed files with 135 additions and 8 deletions
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17
src/fkey.c
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@@ -734,7 +734,24 @@ void sqlite3FkCheck(
pTo = sqlite3LocateTable(pParse, 0, pFKey->zTo, zDb);
}
if( !pTo || locateFkeyIndex(pParse, pTo, pFKey, &pIdx, &aiFree) ){
assert( isIgnoreErrors==0 || (regOld!=0 && regNew==0) );
if( !isIgnoreErrors || db->mallocFailed ) return;
if( isIgnoreErrors && pTo==0 ){
/* If isIgnoreErrors is true, then a table is being dropped. In this
** case SQLite runs a "DELETE FROM xxx" on the table being dropped
** before actually dropping it in order to check FK constraints.
** If the parent table of an FK constraint on the current table is
** missing, behave as if it is empty. i.e. decrement the relevant
** FK counter for each row of the current table with non-NULL keys.
*/
Vdbe *v = sqlite3GetVdbe(pParse);
int iJump = sqlite3VdbeCurrentAddr(v) + pFKey->nCol + 1;
for(i=0; i<pFKey->nCol; i++){
int iReg = pFKey->aCol[i].iFrom + regOld + 1;
sqlite3VdbeAddOp2(v, OP_IsNull, iReg, iJump);
}
sqlite3VdbeAddOp2(v, OP_FkCounter, pFKey->isDeferred, -1);
}
continue;
}
assert( pFKey->nCol==1 || (aiFree && pIdx) );