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/*-------------------------------------------------------------------------
*
* rel.h
* POSTGRES relation descriptor definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: rel.h,v 1.25 1999/07/16 17:07:40 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef REL_H
#define REL_H
#include "access/strat.h"
#include "access/tupdesc.h"
#include "catalog/pg_am.h"
#include "catalog/pg_class.h"
#include "rewrite/prs2lock.h"
#include "storage/fd.h"
typedef struct Trigger
{
char *tgname;
Oid tgfoid;
FmgrInfo tgfunc;
int16 tgtype;
int16 tgnargs;
int16 tgattr[8];
char **tgargs;
} Trigger;
typedef struct TriggerDesc
{
uint16 n_before_statement[4];
uint16 n_before_row[4];
uint16 n_after_row[4];
uint16 n_after_statement[4];
Trigger **tg_before_statement[4];
Trigger **tg_before_row[4];
Trigger **tg_after_row[4];
Trigger **tg_after_statement[4];
Trigger *triggers;
} TriggerDesc;
typedef struct RelationData
{
File rd_fd; /* open file descriptor */
int rd_nblocks; /* number of blocks in rel */
uint16 rd_refcnt; /* reference count */
bool rd_myxactonly; /* uses the local buffer mgr */
bool rd_isnailed; /* rel is nailed in cache */
bool rd_isnoname; /* rel has no name */
bool rd_nonameunlinked; /* noname rel already unlinked */
Form_pg_am rd_am; /* AM tuple */
Form_pg_class rd_rel; /* RELATION tuple */
Oid rd_id; /* relations's object id */
Pointer lockInfo; /* ptr. to misc. info. */
TupleDesc rd_att; /* tuple desciptor */
RuleLock *rd_rules; /* rewrite rules */
IndexStrategy rd_istrat;
RegProcedure *rd_support;
TriggerDesc *trigdesc;
} RelationData;
typedef RelationData *Relation;
/* ----------------
* RelationPtr is used in the executor to support index scans
* where we have to keep track of several index relations in an
* array. -cim 9/10/89
* ----------------
*/
typedef Relation *RelationPtr;
#define InvalidRelation ((Relation)NULL)
/*
* RelationIsValid
* True iff relation descriptor is valid.
*/
#define RelationIsValid(relation) PointerIsValid(relation)
/*
* RelationGetSystemPort
* Returns system port of a relation.
*
* Note:
* Assumes relation descriptor is valid.
*/
#define RelationGetSystemPort(relation) ((relation)->rd_fd)
/*
* RelationGetLockInfo
* Returns the lock information structure in the reldesc
*
*/
#define RelationGetLockInfo(relation) ((relation)->lockInfo)
/*
* RelationHasReferenceCountZero
* True iff relation reference count is zero.
*
* Note:
* Assumes relation descriptor is valid.
*/
#define RelationHasReferenceCountZero(relation) \
((bool)((relation)->rd_refcnt == 0))
/*
* RelationSetReferenceCount
* Sets relation reference count.
*/
#define RelationSetReferenceCount(relation,count) ((relation)->rd_refcnt = count)
/*
* RelationIncrementReferenceCount
* Increments relation reference count.
*/
#define RelationIncrementReferenceCount(relation) ((relation)->rd_refcnt += 1);
/*
* RelationDecrementReferenceCount
* Decrements relation reference count.
*/
#define RelationDecrementReferenceCount(relation) ((relation)->rd_refcnt -= 1)
/*
* RelationGetForm
* Returns relation attribute values for a relation.
*
* Note:
* Assumes relation descriptor is valid.
*/
#define RelationGetForm(relation) ((relation)->rd_rel)
/*
* RelationGetRelid
*
* returns the object id of the relation
*
*/
#define RelationGetRelid(relation) ((relation)->rd_id)
/*
* RelationGetFile
*
* Returns the open File decscriptor
*/
#define RelationGetFile(relation) ((relation)->rd_fd)
/*
* RelationGetRelationName
*
* Returns a Relation Name
*/
#define RelationGetRelationName(relation) (&(relation)->rd_rel->relname)
/*
* RelationGetRelationName
*
* Returns a the number of attributes.
*/
#define RelationGetNumberOfAttributes(relation) ((relation)->rd_rel->relnatts)
/*
* RelationGetDescr
* Returns tuple descriptor for a relation.
*
* Note:
* Assumes relation descriptor is valid.
*/
#define RelationGetDescr(relation) ((relation)->rd_att)
extern IndexStrategy RelationGetIndexStrategy(Relation relation);
extern void RelationSetIndexSupport(Relation relation, IndexStrategy strategy,
RegProcedure *support);
#endif /* REL_H */
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