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Prevent an infinite loop when deleting a table that has a TEMP trigger. (CVS 984)

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FossilOrigin-Name: c8c823b068916711857fa67db10fb479999b55c2
This commit is contained in:
drh
2003-05-17 19:04:03 +00:00
parent 24f1eb74c8
commit 79a519c047
7 changed files with 90 additions and 35 deletions
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42
src/trigger.c
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@@ -127,6 +127,7 @@ void sqliteBeginTrigger(
nt->table = sqliteStrDup(pTableName->a[0].zName);
if( sqlite_malloc_failed ) goto trigger_cleanup;
nt->iDb = iDb;
nt->iTabDb = tab->iDb;
nt->op = op;
nt->tr_tm = tr_tm;
nt->pWhen = sqliteExprDup(pWhen);
@@ -184,7 +185,7 @@ void sqliteFinishTrigger(
v = sqliteGetVdbe(pParse);
if( v==0 ) goto triggerfinish_cleanup;
sqliteBeginWriteOperation(pParse, 0, 0);
sqliteOpenMasterTable(v, nt->iDb==1);
sqliteOpenMasterTable(v, nt->iDb);
addr = sqliteVdbeAddOpList(v, ArraySize(insertTrig), insertTrig);
sqliteVdbeChangeP3(v, addr+2, nt->name, 0);
sqliteVdbeChangeP3(v, addr+3, nt->table, 0);
@@ -359,18 +360,18 @@ void sqliteDeleteTrigger(Trigger *pTrigger){
/*
* This function is called to drop a trigger from the database schema.
*
* This may be called directly from the parser, or from within
* sqliteDropTable(). In the latter case the "nested" argument is true.
* This may be called directly from the parser and therefore identifies
* the trigger by name. The sqliteDropTriggerPtr() routine does the
* same job as this routine except it take a spointer to the trigger
* instead of the trigger name.
*
* Note that this function does not delete the trigger entirely. Instead it
* removes it from the internal schema and places it in the trigDrop hash
* table. This is so that the trigger can be restored into the database schema
* if the transaction is rolled back.
*/
void sqliteDropTrigger(Parse *pParse, SrcList *pName, int nested){
void sqliteDropTrigger(Parse *pParse, SrcList *pName){
Trigger *pTrigger;
Table *pTable;
Vdbe *v;
int i;
const char *zDb;
const char *zName;
@@ -392,13 +393,29 @@ void sqliteDropTrigger(Parse *pParse, SrcList *pName, int nested){
sqliteErrorMsg(pParse, "no such trigger: %S", pName, 0);
goto drop_trigger_cleanup;
}
sqliteDropTriggerPtr(pParse, pTrigger, 0);
drop_trigger_cleanup:
sqliteSrcListDelete(pName);
}
/*
** Drop a trigger given a pointer to that trigger. If nested is false,
** then also generate code to remove the trigger from the SQLITE_MASTER
** table.
*/
void sqliteDropTriggerPtr(Parse *pParse, Trigger *pTrigger, int nested){
Table *pTable;
Vdbe *v;
sqlite *db = pParse->db;
assert( pTrigger->iDb<db->nDb );
if( pTrigger->iDb>=2 ){
sqliteErrorMsg(pParse, "triggers may not be removed from "
"auxiliary database %s", db->aDb[pTrigger->iDb].zName);
goto drop_trigger_cleanup;
return;
}
pTable = sqliteFindTable(db, pTrigger->table, db->aDb[pTrigger->iDb].zName);
pTable = sqliteFindTable(db, pTrigger->table,db->aDb[pTrigger->iTabDb].zName);
assert(pTable);
assert( pTable->iDb==pTrigger->iDb || pTrigger->iDb==1 );
#ifndef SQLITE_OMIT_AUTHORIZATION
@@ -409,7 +426,7 @@ void sqliteDropTrigger(Parse *pParse, SrcList *pName, int nested){
if( pTrigger->iDb ) code = SQLITE_DROP_TEMP_TRIGGER;
if( sqliteAuthCheck(pParse, code, pTrigger->name, pTable->zName, zDb) ||
sqliteAuthCheck(pParse, SQLITE_DELETE, zTab, 0, zDb) ){
goto drop_trigger_cleanup;
return;
}
}
#endif
@@ -432,7 +449,7 @@ void sqliteDropTrigger(Parse *pParse, SrcList *pName, int nested){
sqliteBeginWriteOperation(pParse, 0, 0);
sqliteOpenMasterTable(v, pTrigger->iDb);
base = sqliteVdbeAddOpList(v, ArraySize(dropTrigger), dropTrigger);
sqliteVdbeChangeP3(v, base+1, zName, 0);
sqliteVdbeChangeP3(v, base+1, pTrigger->name, 0);
if( pTrigger->iDb==0 ){
sqliteChangeCookie(db, v);
}
@@ -444,6 +461,8 @@ void sqliteDropTrigger(Parse *pParse, SrcList *pName, int nested){
* If this is not an "explain", then delete the trigger structure.
*/
if( !pParse->explain ){
const char *zName = pTrigger->name;
int nName = strlen(zName);
if( pTable->pTrigger == pTrigger ){
pTable->pTrigger = pTrigger->pNext;
}else{
@@ -460,9 +479,6 @@ void sqliteDropTrigger(Parse *pParse, SrcList *pName, int nested){
sqliteHashInsert(&(db->aDb[pTrigger->iDb].trigHash), zName, nName+1, 0);
sqliteDeleteTrigger(pTrigger);
}
drop_trigger_cleanup:
sqliteSrcListDelete(pName);
}
/*