219 lines
5.0 KiB
C
219 lines
5.0 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 1.30 1999/11/16 04:14:03 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 "access/strat.h"
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#include "access/tupdesc.h"
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#include "catalog/pg_am.h"
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#include "catalog/pg_class.h"
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#include "rewrite/prs2lock.h"
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#include "storage/fd.h"
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/*
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* LockRelId and LockInfo really belong to lmgr.h, but it's more convenient
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* to declare them here so we can have a LockInfoData field in a Relation.
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*/
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typedef struct LockRelId
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{
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Oid relId; /* a relation identifier */
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Oid dbId; /* a database identifier */
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} LockRelId;
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typedef struct LockInfoData
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{
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LockRelId lockRelId;
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} LockInfoData;
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typedef LockInfoData *LockInfo;
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typedef struct Trigger
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{
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Oid tgoid;
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char *tgname;
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Oid tgfoid;
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FmgrInfo tgfunc;
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int16 tgtype;
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bool tgenabled;
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bool tgisconstraint;
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bool tgdeferrable;
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bool tginitdeferred;
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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_myxactonly; /* rel uses the local buffer mgr */
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bool rd_isnailed; /* rel is nailed in cache */
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bool rd_isnoname; /* rel has no name */
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bool rd_unlinked; /* rel already unlinked or not created yet */
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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; /* relation's object id */
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LockInfoData rd_lockInfo; /* lock manager's info for locking relation */
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TupleDesc rd_att; /* tuple descriptor */
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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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/*
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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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#define InvalidRelation ((Relation) NULL)
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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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* 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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* RelationGetForm
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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 RelationGetForm(relation) ((relation)->rd_rel)
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/*
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* RelationGetRelid
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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 RelationGetRelid(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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/* added to prevent circular dependency. bjm 1999/11/15 */
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char *get_temp_rel_by_physicalname(char *relname);
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#define RelationGetRelationName(relation) \
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(\
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(strncmp(RelationGetPhysicalRelationName(relation), \
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"pg_temp.", strlen("pg_temp.")) != 0) \
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? \
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RelationGetPhysicalRelationName(relation) \
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: \
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get_temp_rel_by_physicalname( \
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RelationGetPhysicalRelationName(relation)) \
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)
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/*
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* RelationGetPhysicalRelationName
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*
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* Returns a Relation Name
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*/
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#define RelationGetPhysicalRelationName(relation) (NameStr((relation)->rd_rel->relname))
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/*
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* RelationGetNumberOfAttributes
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*
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* Returns 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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* RelationGetDescr
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* Returns tuple descriptor for a relation.
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*/
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#define RelationGetDescr(relation) ((relation)->rd_att)
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extern IndexStrategy RelationGetIndexStrategy(Relation relation);
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extern void RelationSetIndexSupport(Relation relation, IndexStrategy strategy,
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RegProcedure *support);
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#endif /* REL_H */
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