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Allow extracting machine-readable object identity

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Introduce pg_identify_object(oid,oid,int4), which is similar in spirit
to pg_describe_object but instead produces a row of machine-readable
information to uniquely identify the given object, without resorting to
OIDs or other internal representation.  This is intended to be used in
the event trigger implementation, to report objects being operated on;
but it has usefulness of its own.

Catalog version bumped because of the new function.
This commit is contained in:
Alvaro Herrera
2013-03-20 18:19:19 -03:00
parent a7921f71a3
commit f8348ea32e
12 changed files with 2141 additions and 955 deletions
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52
src/backend/commands/alter.c
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@ -752,58 +752,6 @@ ExecAlterOwnerStmt(AlterOwnerStmt *stmt)
}
}
/*
* Return a copy of the tuple for the object with the given object OID, from
* the given catalog (which must have been opened by the caller and suitably
* locked). NULL is returned if the OID is not found.
*
* We try a syscache first, if available.
*
* XXX this function seems general in possible usage. Given sufficient callers
* elsewhere, we should consider moving it to a more appropriate place.
*/
static HeapTuple
get_catalog_object_by_oid(Relation catalog, Oid objectId)
{
HeapTuple tuple;
Oid classId = RelationGetRelid(catalog);
int oidCacheId = get_object_catcache_oid(classId);
if (oidCacheId > 0)
{
tuple = SearchSysCacheCopy1(oidCacheId, ObjectIdGetDatum(objectId));
if (!HeapTupleIsValid(tuple)) /* should not happen */
return NULL;
}
else
{
Oid oidIndexId = get_object_oid_index(classId);
SysScanDesc scan;
ScanKeyData skey;
Assert(OidIsValid(oidIndexId));
ScanKeyInit(&skey,
ObjectIdAttributeNumber,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(objectId));
scan = systable_beginscan(catalog, oidIndexId, true,
SnapshotNow, 1, &skey);
tuple = systable_getnext(scan);
if (!HeapTupleIsValid(tuple))
{
systable_endscan(scan);
return NULL;
}
tuple = heap_copytuple(tuple);
systable_endscan(scan);
}
return tuple;
}
/*
* Generic function to change the ownership of a given object, for simple
* cases (won't work for tables, nor other cases where we need to do more than