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195 lines
4.6 KiB
C
195 lines
4.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* rel.h--
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* POSTGRES relation descriptor definitions.
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: rel.h,v 1.14 1997/11/21 19:12:32 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef REL_H
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#define REL_H
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#include <catalog/pg_am.h>
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#include <catalog/pg_class.h>
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#include <access/strat.h>
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#include <access/tupdesc.h>
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#include <rewrite/prs2lock.h>
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#include <storage/fd.h>
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typedef struct Trigger
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{
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char *tgname;
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Oid tgfoid;
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func_ptr tgfunc;
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func_ptr tgplfunc;
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int16 tgtype;
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int16 tgnargs;
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int16 tgattr[8];
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char **tgargs;
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} Trigger;
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typedef struct TriggerDesc
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{
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uint16 n_before_statement[4];
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uint16 n_before_row[4];
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uint16 n_after_row[4];
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uint16 n_after_statement[4];
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Trigger **tg_before_statement[4];
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Trigger **tg_before_row[4];
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Trigger **tg_after_row[4];
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Trigger **tg_after_statement[4];
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Trigger *triggers;
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} TriggerDesc;
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typedef struct RelationData
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{
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File rd_fd; /* open file descriptor */
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int rd_nblocks; /* number of blocks in rel */
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uint16 rd_refcnt; /* reference count */
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bool rd_islocal; /* uses the local buffer mgr */
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bool rd_isnailed; /* rel is nailed in cache */
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bool rd_istemp; /* rel is a temp rel */
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bool rd_tmpunlinked; /* temp rel already unlinked */
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Form_pg_am rd_am; /* AM tuple */
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Form_pg_class rd_rel; /* RELATION tuple */
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Oid rd_id; /* relations's object id */
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Pointer lockInfo; /* ptr. to misc. info. */
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TupleDesc rd_att; /* tuple desciptor */
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RuleLock *rd_rules; /* rewrite rules */
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IndexStrategy rd_istrat;
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RegProcedure *rd_support;
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TriggerDesc *trigdesc;
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} RelationData;
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typedef RelationData *Relation;
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/* ----------------
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* RelationPtr is used in the executor to support index scans
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* where we have to keep track of several index relations in an
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* array. -cim 9/10/89
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* ----------------
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*/
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typedef Relation *RelationPtr;
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#define InvalidRelation ((Relation)NULL)
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/*
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* RelationIsValid --
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* True iff relation descriptor is valid.
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*/
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#define RelationIsValid(relation) PointerIsValid(relation)
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/*
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* RelationGetSystemPort --
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* Returns system port of a relation.
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*
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* Note:
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* Assumes relation descriptor is valid.
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*/
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#define RelationGetSystemPort(relation) ((relation)->rd_fd)
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/*
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* RelationGetLockInfo --
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* Returns the lock information structure in the reldesc
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*
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*/
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#define RelationGetLockInfo(relation) ((relation)->lockInfo)
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/*
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* RelationHasReferenceCountZero --
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* True iff relation reference count is zero.
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*
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* Note:
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* Assumes relation descriptor is valid.
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*/
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#define RelationHasReferenceCountZero(relation) \
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((bool)((relation)->rd_refcnt == 0))
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/*
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* RelationSetReferenceCount --
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* Sets relation reference count.
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*/
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#define RelationSetReferenceCount(relation,count) ((relation)->rd_refcnt = count)
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/*
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* RelationIncrementReferenceCount --
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* Increments relation reference count.
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*/
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#define RelationIncrementReferenceCount(relation) ((relation)->rd_refcnt += 1);
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/*
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* RelationDecrementReferenceCount --
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* Decrements relation reference count.
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*/
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#define RelationDecrementReferenceCount(relation) ((relation)->rd_refcnt -= 1)
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/*
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* RelationGetAccessMethodTupleForm --
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* Returns access method attribute values for a relation.
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*
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* Note:
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* Assumes relation descriptor is valid.
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*/
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#define RelationGetAccessMethodTupleForm(relation) ((relation)->rd_am)
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/*
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* RelationGetRelationTupleForm --
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* Returns relation attribute values for a relation.
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*
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* Note:
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* Assumes relation descriptor is valid.
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*/
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#define RelationGetRelationTupleForm(relation) ((relation)->rd_rel)
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/*
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* RelationGetRelationId --
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*
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* returns the object id of the relation
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*
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*/
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#define RelationGetRelationId(relation) ((relation)->rd_id)
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/*
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* RelationGetFile --
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*
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* Returns the open File decscriptor
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*/
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#define RelationGetFile(relation) ((relation)->rd_fd)
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/*
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* RelationGetRelationName --
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*
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* Returns a Relation Name
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*/
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#define RelationGetRelationName(relation) (&(relation)->rd_rel->relname)
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/*
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* RelationGetRelationName --
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*
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* Returns a the number of attributes.
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*/
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#define RelationGetNumberOfAttributes(relation) ((relation)->rd_rel->relnatts)
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/*
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* RelationGetTupleDescriptor --
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* Returns tuple descriptor for a relation.
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*
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* Note:
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* Assumes relation descriptor is valid.
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*/
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#define RelationGetTupleDescriptor(relation) ((relation)->rd_att)
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extern IndexStrategy RelationGetIndexStrategy(Relation relation);
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extern void
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RelationSetIndexSupport(Relation relation, IndexStrategy strategy,
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RegProcedure *support);
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#endif /* REL_H */
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