80559fa9e9
of HeapTupleSatisfiesItself() to trigger a hint-bit update on the tuple: if the row was updated or deleted by a subtransaction of my own transaction that was later rolled back. This cannot occur in pre-8.0 of course, so the hint-bit patch applied a couple weeks ago is OK for existing releases. But for 8.0 it seems we had better fix things so that RI_FKey_check can pass the correct buffer number to HeapTupleSatisfiesItself. Accordingly, add fields to the TriggerData struct to carry the buffer ID(s) for the old and new tuple(s). There are other possible solutions but this one seems cleanest; it will allow other AFTER-trigger functions to safely do tqual.c calls if they want to. Put new fields at end of struct so that there is no API breakage.
177 lines
5.4 KiB
C
177 lines
5.4 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* trigger.h
|
|
* Declarations for trigger handling.
|
|
*
|
|
* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
* $PostgreSQL: pgsql/src/include/commands/trigger.h,v 1.50 2004/10/30 20:53:06 tgl Exp $
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifndef TRIGGER_H
|
|
#define TRIGGER_H
|
|
|
|
#include "nodes/execnodes.h"
|
|
#include "nodes/parsenodes.h"
|
|
|
|
/*
|
|
* TriggerData is the node type that is passed as fmgr "context" info
|
|
* when a function is called by the trigger manager.
|
|
*/
|
|
|
|
#define CALLED_AS_TRIGGER(fcinfo) \
|
|
((fcinfo)->context != NULL && IsA((fcinfo)->context, TriggerData))
|
|
|
|
typedef uint32 TriggerEvent;
|
|
|
|
typedef struct TriggerData
|
|
{
|
|
NodeTag type;
|
|
TriggerEvent tg_event;
|
|
Relation tg_relation;
|
|
HeapTuple tg_trigtuple;
|
|
HeapTuple tg_newtuple;
|
|
Trigger *tg_trigger;
|
|
Buffer tg_trigtuplebuf;
|
|
Buffer tg_newtuplebuf;
|
|
} TriggerData;
|
|
|
|
/* TriggerEvent bit flags */
|
|
|
|
#define TRIGGER_EVENT_INSERT 0x00000000
|
|
#define TRIGGER_EVENT_DELETE 0x00000001
|
|
#define TRIGGER_EVENT_UPDATE 0x00000002
|
|
#define TRIGGER_EVENT_OPMASK 0x00000003
|
|
#define TRIGGER_EVENT_ROW 0x00000004
|
|
#define TRIGGER_EVENT_BEFORE 0x00000008
|
|
|
|
/* More TriggerEvent flags, used only within trigger.c */
|
|
|
|
#define AFTER_TRIGGER_DONE 0x00000010
|
|
#define AFTER_TRIGGER_IN_PROGRESS 0x00000020
|
|
#define AFTER_TRIGGER_DEFERRABLE 0x00000040
|
|
#define AFTER_TRIGGER_INITDEFERRED 0x00000080
|
|
|
|
#define TRIGGER_FIRED_BY_INSERT(event) \
|
|
(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
|
|
TRIGGER_EVENT_INSERT)
|
|
|
|
#define TRIGGER_FIRED_BY_DELETE(event) \
|
|
(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
|
|
TRIGGER_EVENT_DELETE)
|
|
|
|
#define TRIGGER_FIRED_BY_UPDATE(event) \
|
|
(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
|
|
TRIGGER_EVENT_UPDATE)
|
|
|
|
#define TRIGGER_FIRED_FOR_ROW(event) \
|
|
((TriggerEvent) (event) & TRIGGER_EVENT_ROW)
|
|
|
|
#define TRIGGER_FIRED_FOR_STATEMENT(event) \
|
|
(!TRIGGER_FIRED_FOR_ROW (event))
|
|
|
|
#define TRIGGER_FIRED_BEFORE(event) \
|
|
((TriggerEvent) (event) & TRIGGER_EVENT_BEFORE)
|
|
|
|
#define TRIGGER_FIRED_AFTER(event) \
|
|
(!TRIGGER_FIRED_BEFORE (event))
|
|
|
|
/*
|
|
* RI trigger function arguments are stored in pg_trigger.tgargs bytea
|
|
*
|
|
* constrname\0fkrel\0pkrel\0matchtype\0fkatt\0pkatt\0fkatt\0pkatt\0...
|
|
*
|
|
* There are one or more pairs of fkatt/pkatt names.
|
|
*
|
|
* The relation names are no longer of much use since they are not
|
|
* guaranteed unique; they are present only for backwards compatibility.
|
|
* Use the tgrelid and tgconstrrelid fields to identify the referenced
|
|
* relations, instead. (But note that which is which will depend on which
|
|
* trigger you are looking at!)
|
|
*/
|
|
#define RI_CONSTRAINT_NAME_ARGNO 0
|
|
#define RI_FK_RELNAME_ARGNO 1
|
|
#define RI_PK_RELNAME_ARGNO 2
|
|
#define RI_MATCH_TYPE_ARGNO 3
|
|
#define RI_FIRST_ATTNAME_ARGNO 4 /* first attname pair
|
|
* starts here */
|
|
|
|
#define RI_KEYPAIR_FK_IDX 0
|
|
#define RI_KEYPAIR_PK_IDX 1
|
|
|
|
#define RI_MAX_NUMKEYS INDEX_MAX_KEYS
|
|
#define RI_MAX_ARGUMENTS (RI_FIRST_ATTNAME_ARGNO + (RI_MAX_NUMKEYS * 2))
|
|
|
|
|
|
extern Oid CreateTrigger(CreateTrigStmt *stmt, bool forConstraint);
|
|
|
|
extern void DropTrigger(Oid relid, const char *trigname,
|
|
DropBehavior behavior);
|
|
extern void RemoveTriggerById(Oid trigOid);
|
|
|
|
extern void renametrig(Oid relid, const char *oldname, const char *newname);
|
|
|
|
extern void RelationBuildTriggers(Relation relation);
|
|
|
|
extern TriggerDesc *CopyTriggerDesc(TriggerDesc *trigdesc);
|
|
|
|
extern void FreeTriggerDesc(TriggerDesc *trigdesc);
|
|
|
|
extern void ExecBSInsertTriggers(EState *estate,
|
|
ResultRelInfo *relinfo);
|
|
extern void ExecASInsertTriggers(EState *estate,
|
|
ResultRelInfo *relinfo);
|
|
extern HeapTuple ExecBRInsertTriggers(EState *estate,
|
|
ResultRelInfo *relinfo,
|
|
HeapTuple trigtuple);
|
|
extern void ExecARInsertTriggers(EState *estate,
|
|
ResultRelInfo *relinfo,
|
|
HeapTuple trigtuple);
|
|
extern void ExecBSDeleteTriggers(EState *estate,
|
|
ResultRelInfo *relinfo);
|
|
extern void ExecASDeleteTriggers(EState *estate,
|
|
ResultRelInfo *relinfo);
|
|
extern bool ExecBRDeleteTriggers(EState *estate,
|
|
ResultRelInfo *relinfo,
|
|
ItemPointer tupleid,
|
|
CommandId cid);
|
|
extern void ExecARDeleteTriggers(EState *estate,
|
|
ResultRelInfo *relinfo,
|
|
ItemPointer tupleid);
|
|
extern void ExecBSUpdateTriggers(EState *estate,
|
|
ResultRelInfo *relinfo);
|
|
extern void ExecASUpdateTriggers(EState *estate,
|
|
ResultRelInfo *relinfo);
|
|
extern HeapTuple ExecBRUpdateTriggers(EState *estate,
|
|
ResultRelInfo *relinfo,
|
|
ItemPointer tupleid,
|
|
HeapTuple newtuple,
|
|
CommandId cid);
|
|
extern void ExecARUpdateTriggers(EState *estate,
|
|
ResultRelInfo *relinfo,
|
|
ItemPointer tupleid,
|
|
HeapTuple newtuple);
|
|
|
|
extern void AfterTriggerBeginXact(void);
|
|
extern void AfterTriggerBeginQuery(void);
|
|
extern void AfterTriggerEndQuery(void);
|
|
extern void AfterTriggerEndXact(void);
|
|
extern void AfterTriggerAbortXact(void);
|
|
extern void AfterTriggerBeginSubXact(void);
|
|
extern void AfterTriggerEndSubXact(bool isCommit);
|
|
|
|
extern void AfterTriggerSetState(ConstraintsSetStmt *stmt);
|
|
|
|
|
|
/*
|
|
* in utils/adt/ri_triggers.c
|
|
*/
|
|
extern bool RI_FKey_keyequal_upd(TriggerData *trigdata);
|
|
extern bool RI_Initial_Check(FkConstraint *fkconstraint,
|
|
Relation rel,
|
|
Relation pkrel);
|
|
|
|
#endif /* TRIGGER_H */
|