79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* sequence.c
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* Generic routines for sequence-related code.
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*
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* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/access/sequence/sequence.c
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*
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*
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* NOTES
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* This file contains sequence_ routines that implement access to sequences
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* (in contrast to other relation types like indexes).
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/relation.h"
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#include "access/sequence.h"
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#include "storage/lmgr.h"
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static inline void validate_relation_kind(Relation r);
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/* ----------------
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* sequence_open - open a sequence relation by relation OID
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*
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* This is essentially relation_open plus check that the relation
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* is a sequence.
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* ----------------
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*/
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Relation
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sequence_open(Oid relationId, LOCKMODE lockmode)
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{
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Relation r;
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r = relation_open(relationId, lockmode);
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validate_relation_kind(r);
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return r;
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}
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/* ----------------
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* sequence_close - close a sequence
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*
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* If lockmode is not "NoLock", we then release the specified lock.
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*
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* Note that it is often sensible to hold a lock beyond relation_close;
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* in that case, the lock is released automatically at xact end.
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* ----------------
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*/
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void
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sequence_close(Relation relation, LOCKMODE lockmode)
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{
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relation_close(relation, lockmode);
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}
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/* ----------------
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* validate_relation_kind - check the relation's kind
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*
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* Make sure relkind is from a sequence.
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* ----------------
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*/
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static inline void
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validate_relation_kind(Relation r)
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{
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if (r->rd_rel->relkind != RELKIND_SEQUENCE)
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ereport(ERROR,
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(errcode(ERRCODE_WRONG_OBJECT_TYPE),
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errmsg("cannot open relation \"%s\"",
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RelationGetRelationName(r)),
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errdetail_relkind_not_supported(r->rd_rel->relkind)));
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}
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