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@ -8,7 +8,7 @@ |
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* Portions Copyright (c) 1994, Regents of the University of California |
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* |
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* IDENTIFICATION |
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* $PostgreSQL: pgsql/src/backend/catalog/dependency.c,v 1.52 2006/04/29 16:43:54 momjian Exp $ |
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* $PostgreSQL: pgsql/src/backend/catalog/dependency.c,v 1.53 2006/04/30 01:08:06 momjian Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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@ -1931,89 +1931,3 @@ getRelationDescription(StringInfo buffer, Oid relid) |
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ReleaseSysCache(relTup); |
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} |
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/* Recursively travel and search for the default sequence. Finally detach it */ |
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void performSequenceDefaultDeletion(const ObjectAddress *object, |
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DropBehavior behavior, int deleteFlag) |
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{
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ScanKeyData key[3]; |
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int nkeys; |
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SysScanDesc scan; |
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HeapTuple tup; |
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ObjectAddress otherObject;
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Relation depRel; |
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depRel = heap_open(DependRelationId, RowExclusiveLock); |
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ScanKeyInit(&key[0], |
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Anum_pg_depend_classid, |
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BTEqualStrategyNumber, F_OIDEQ, |
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ObjectIdGetDatum(object->classId)); |
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ScanKeyInit(&key[1], |
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Anum_pg_depend_objid, |
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BTEqualStrategyNumber, F_OIDEQ, |
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ObjectIdGetDatum(object->objectId)); |
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if (object->objectSubId != 0) |
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{ |
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ScanKeyInit(&key[2], |
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Anum_pg_depend_objsubid, |
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BTEqualStrategyNumber, F_INT4EQ, |
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Int32GetDatum(object->objectSubId)); |
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nkeys = 3; |
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} |
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else |
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nkeys = 2; |
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scan = systable_beginscan(depRel, DependDependerIndexId, true, |
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SnapshotNow, nkeys, key); |
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while (HeapTupleIsValid(tup = systable_getnext(scan))) |
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{ |
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Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(tup); |
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otherObject.classId = foundDep->refclassid; |
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otherObject.objectId = foundDep->refobjid; |
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otherObject.objectSubId = foundDep->refobjsubid; |
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/* Detach the default sequence from the relation */ |
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if(deleteFlag == 1)
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{
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simple_heap_delete(depRel, &tup->t_self);
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break; |
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} |
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switch (foundDep->deptype) |
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{ |
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case DEPENDENCY_NORMAL:
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{ |
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if(getObjectClass(&otherObject) == OCLASS_CLASS) |
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{ |
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/* Dont allow to change the default sequence */ |
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if(deleteFlag == 2)
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{
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systable_endscan(scan); |
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heap_close(depRel, RowExclusiveLock); |
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elog(ERROR, "%s is a SERIAL sequence. Can't alter the relation", getObjectDescription(&otherObject)); |
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return; |
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} |
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else /* Detach the default sequence from the relation */ |
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{ |
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performSequenceDefaultDeletion(&otherObject, behavior, 1); |
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systable_endscan(scan); |
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heap_close(depRel, RowExclusiveLock); |
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return;
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} |
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} |
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} |
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} |
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} |
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systable_endscan(scan); |
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heap_close(depRel, RowExclusiveLock);
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} |
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Bruce Momjian
20 years ago