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https://github.com/postgres/postgres.git
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Tom Lane
789ddcb5fe
depend on this rather than the trigger argument strings to locate the other relation to test. This makes RI triggers function properly in the presence of schemas and temp tables. Along the way, fix bogus lack of locking in RI triggers, handle quoting of names fully correctly, compute required sizes of query buffers with some semblance of accuracy.
262 lines
6.8 KiB
C
262 lines
6.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* rel.h
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* POSTGRES relation descriptor (a/k/a relcache entry) definitions.
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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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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: rel.h,v 1.59 2002/04/01 22:36:13 tgl 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 "catalog/pg_index.h"
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#include "rewrite/prs2lock.h"
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#include "storage/block.h"
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#include "storage/fd.h"
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#include "storage/relfilenode.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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/*
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* Likewise, this struct really belongs to trigger.h, but for convenience
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* we put it here.
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*/
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typedef struct Trigger
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{
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Oid tgoid; /* OID of trigger (pg_trigger row) */
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/* Remaining fields are copied from pg_trigger, see pg_trigger.h */
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char *tgname;
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Oid tgfoid;
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int16 tgtype;
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bool tgenabled;
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bool tgisconstraint;
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Oid tgconstrrelid;
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bool tgdeferrable;
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bool tginitdeferred;
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int16 tgnargs;
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int16 tgattr[FUNC_MAX_ARGS];
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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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/*
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* Index data to identify which triggers are which. Since each
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* trigger can appear in more than one class, for each class we
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* provide a list of integer indexes into the triggers array.
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*/
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#define TRIGGER_NUM_EVENT_CLASSES 4
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uint16 n_before_statement[TRIGGER_NUM_EVENT_CLASSES];
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uint16 n_before_row[TRIGGER_NUM_EVENT_CLASSES];
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uint16 n_after_row[TRIGGER_NUM_EVENT_CLASSES];
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uint16 n_after_statement[TRIGGER_NUM_EVENT_CLASSES];
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int *tg_before_statement[TRIGGER_NUM_EVENT_CLASSES];
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int *tg_before_row[TRIGGER_NUM_EVENT_CLASSES];
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int *tg_after_row[TRIGGER_NUM_EVENT_CLASSES];
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int *tg_after_statement[TRIGGER_NUM_EVENT_CLASSES];
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/* The actual array of triggers is here */
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Trigger *triggers;
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int numtriggers;
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} TriggerDesc;
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/* ----------
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* Same for the statistics collector data in Relation and scan data.
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* ----------
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*/
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typedef struct PgStat_Info
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{
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void *tabentry;
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bool no_stats;
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bool heap_scan_counted;
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bool index_scan_counted;
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} PgStat_Info;
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/*
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* Here are the contents of a relation cache entry.
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*/
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typedef struct RelationData
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{
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File rd_fd; /* open file descriptor, or -1 if none */
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RelFileNode rd_node; /* file node (physical identifier) */
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BlockNumber rd_nblocks; /* number of blocks in rel */
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BlockNumber rd_targblock; /* current insertion target block, or
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* InvalidBlockNumber */
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int 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_indexfound; /* true if rd_indexlist is valid */
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bool rd_uniqueindex; /* true if rel is a UNIQUE index */
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Form_pg_class rd_rel; /* RELATION tuple */
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TupleDesc rd_att; /* tuple descriptor */
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Oid rd_id; /* relation's object id */
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List *rd_indexlist; /* list of OIDs of indexes on relation */
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LockInfoData rd_lockInfo; /* lock mgr's info for locking relation */
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RuleLock *rd_rules; /* rewrite rules */
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MemoryContext rd_rulescxt; /* private memory cxt for rd_rules, if any */
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TriggerDesc *trigdesc; /* Trigger info, or NULL if rel has none */
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/* These are non-NULL only for an index relation: */
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Form_pg_index rd_index; /* pg_index tuple describing this index */
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Form_pg_am rd_am; /* pg_am tuple for index's AM */
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/* index access support info (used only for an index relation) */
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MemoryContext rd_indexcxt; /* private memory cxt for this stuff */
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IndexStrategy rd_istrat; /* operator strategy map */
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Oid *rd_operator; /* OIDs of index operators */
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RegProcedure *rd_support; /* OIDs of support procedures */
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struct FmgrInfo *rd_supportinfo; /* lookup info for support
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* procedures */
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/* "struct FmgrInfo" avoids need to include fmgr.h here */
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/* statistics collection area */
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PgStat_Info pgstat_info;
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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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* 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) \
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((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) \
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((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) \
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(AssertMacro((relation)->rd_refcnt > 0), \
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(relation)->rd_refcnt -= 1)
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/*
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* RelationGetForm
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* Returns pg_class tuple 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 OID of the relation
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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 descriptor for the rel
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*/
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#define RelationGetFile(relation) ((relation)->rd_fd)
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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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/*
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* RelationGetIndexStrategy
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* Returns index strategy 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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* Assumes relation descriptor is for an index relation.
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*/
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#define RelationGetIndexStrategy(relation) ((relation)->rd_istrat)
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/*
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* RelationGetRelationName
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*
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* Returns the rel's name.
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*
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* Note that the name is only unique within the containing namespace.
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*/
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#define RelationGetRelationName(relation) \
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(NameStr((relation)->rd_rel->relname))
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/*
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* RelationGetNamespace
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*
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* Returns the rel's namespace OID.
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*/
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#define RelationGetNamespace(relation) \
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((relation)->rd_rel->relnamespace)
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#endif /* REL_H */
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