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@ -1,6 +1,7 @@ |
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/*-------------------------------------------------------------------------
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* |
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* catalog.c |
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* routines concerned with catalog naming conventions |
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* |
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* |
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group |
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@ -8,7 +9,7 @@ |
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* |
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* |
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* IDENTIFICATION |
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* $Header: /cvsroot/pgsql/src/backend/catalog/catalog.c,v 1.44 2001/11/16 23:30:35 tgl Exp $ |
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* $Header: /cvsroot/pgsql/src/backend/catalog/catalog.c,v 1.45 2002/04/12 20:38:18 tgl Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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@ -18,9 +19,9 @@ |
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#include "access/transam.h" |
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#include "catalog/catalog.h" |
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#include "catalog/catname.h" |
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#include "catalog/pg_type.h" |
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#include "catalog/pg_namespace.h" |
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#include "miscadmin.h" |
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#include "utils/lsyscache.h" |
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/*
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* relpath - construct path to a relation's file |
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@ -74,54 +75,121 @@ GetDatabasePath(Oid tblNode) |
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/*
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* IsSystemRelationName |
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* True iff name is the name of a system catalog relation. |
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* IsSystemRelation |
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* True iff the relation is a system catalog relation. |
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* |
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* NB: TOAST relations are considered system relations by this test. |
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* NB: TOAST relations are considered system relations by this test |
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* for compatibility with the old IsSystemRelationName function. |
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* This is appropriate in many places but not all. Where it's not, |
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* also check IsToastRelationName. |
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* also check IsToastRelation. |
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* |
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* We now make a new requirement where system catalog relns must begin |
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* with pg_ while user relns are forbidden to do so. Make the test |
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* trivial and instantaneous. |
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* We now just test if the relation is in the system catalog namespace; |
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* so it's no longer necessary to forbid user relations from having |
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* names starting with pg_. Now only schema names have the pg_ |
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* distinction/requirement. |
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*/ |
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bool |
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IsSystemRelation(Relation relation) |
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{ |
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return IsSystemNamespace(RelationGetNamespace(relation)) || |
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IsToastNamespace(RelationGetNamespace(relation)); |
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} |
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/*
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* IsSystemClass |
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* Like the above, but takes a Form_pg_class as argument. |
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* Used when we do not want to open the relation and have to |
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* search pg_class directly. |
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*/ |
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bool |
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IsSystemClass(Form_pg_class reltuple) |
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{ |
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Oid relnamespace = reltuple->relnamespace; |
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return IsSystemNamespace(relnamespace) || |
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IsToastNamespace(relnamespace); |
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} |
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/*
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* IsToastRelation |
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* True iff relation is a TOAST support relation (or index). |
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*/ |
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bool |
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IsToastRelation(Relation relation) |
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{ |
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return IsToastNamespace(RelationGetNamespace(relation)); |
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} |
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/*
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* IsToastClass |
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* Like the above, but takes a Form_pg_class as argument. |
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* Used when we do not want to open the relation and have to |
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* search pg_class directly. |
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*/ |
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bool |
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IsToastClass(Form_pg_class reltuple) |
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{ |
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Oid relnamespace = reltuple->relnamespace; |
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return IsToastNamespace(relnamespace); |
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} |
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/*
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* IsSystemNamespace |
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* True iff namespace is pg_catalog. |
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* |
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* XXX this is way bogus. -- pma |
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* NOTE: the reason this isn't a macro is to avoid having to include |
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* catalog/pg_namespace.h in a lot of places. |
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*/ |
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bool |
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IsSystemRelationName(const char *relname) |
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IsSystemNamespace(Oid namespaceId) |
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{ |
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/* ugly coding for speed */ |
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return (relname[0] == 'p' && |
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relname[1] == 'g' && |
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relname[2] == '_'); |
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return namespaceId == PG_CATALOG_NAMESPACE; |
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} |
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/*
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* IsToastNamespace |
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* True iff namespace is pg_toast. |
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* |
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* NOTE: the reason this isn't a macro is to avoid having to include |
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* catalog/pg_namespace.h in a lot of places. |
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*/ |
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bool |
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IsToastNamespace(Oid namespaceId) |
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{ |
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return namespaceId == PG_TOAST_NAMESPACE; |
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} |
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/*
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* IsToastRelationName |
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* True iff name is the name of a TOAST support relation (or index). |
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* IsReservedName |
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* True iff name starts with the pg_ prefix. |
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* |
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* For some classes of objects, the prefix pg_ is reserved |
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* for system objects only. |
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*/ |
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bool |
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IsToastRelationName(const char *relname) |
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IsReservedName(const char *name) |
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{ |
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return strncmp(relname, "pg_toast_", 9) == 0; |
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/* ugly coding for speed */ |
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return (name[0] == 'p' && |
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name[1] == 'g' && |
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name[2] == '_'); |
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} |
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/*
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* IsSharedSystemRelationName |
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* True iff name is the name of a shared system catalog relation. |
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* |
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* Note: This function assumes that this is a system relation |
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* in the first place. If that is not known, check the namespace |
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* (with IsSystemNamespace) before calling this function. |
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*/ |
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bool |
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IsSharedSystemRelationName(const char *relname) |
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{ |
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int i; |
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/*
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* Quick out: if it's not a system relation, it can't be a shared |
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* system relation. |
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*/ |
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if (!IsSystemRelationName(relname)) |
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return FALSE; |
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i = 0; |
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while (SharedSystemRelationNames[i] != NULL) |
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{ |
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@ -132,6 +200,7 @@ IsSharedSystemRelationName(const char *relname) |
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return FALSE; |
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} |
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/*
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* newoid - returns a unique identifier across all catalogs. |
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* |
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Tom Lane
24 years ago