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7de307f96c
divide backend/commands by object type, let's try to pay at least minimal attention to respecting that structure, eh? Also reorder the contents of tablecmds.c; it seems odd to me to put ALTER commands before creation/deletion commands.
185 lines
5.3 KiB
C
185 lines
5.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* trigger.h
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* Declarations for trigger handling.
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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: trigger.h,v 1.35 2002/04/26 19:29:47 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef TRIGGER_H
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#define TRIGGER_H
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#include "nodes/execnodes.h"
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#include "nodes/parsenodes.h"
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/*
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* TriggerData is the node type that is passed as fmgr "context" info
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* when a function is called by the trigger manager.
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*/
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#define CALLED_AS_TRIGGER(fcinfo) \
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((fcinfo)->context != NULL && IsA((fcinfo)->context, TriggerData))
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typedef uint32 TriggerEvent;
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typedef struct TriggerData
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{
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NodeTag type;
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TriggerEvent tg_event;
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Relation tg_relation;
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HeapTuple tg_trigtuple;
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HeapTuple tg_newtuple;
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Trigger *tg_trigger;
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} TriggerData;
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/* TriggerEvent bit flags */
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#define TRIGGER_EVENT_INSERT 0x00000000
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#define TRIGGER_EVENT_DELETE 0x00000001
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#define TRIGGER_EVENT_UPDATE 0x00000002
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#define TRIGGER_EVENT_OPMASK 0x00000003
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#define TRIGGER_EVENT_ROW 0x00000004
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#define TRIGGER_EVENT_BEFORE 0x00000008
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#define TRIGGER_DEFERRED_DONE 0x00000010
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#define TRIGGER_DEFERRED_CANCELED 0x00000020
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#define TRIGGER_DEFERRED_DEFERRABLE 0x00000040
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#define TRIGGER_DEFERRED_INITDEFERRED 0x00000080
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#define TRIGGER_DEFERRED_HAS_BEFORE 0x00000100
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#define TRIGGER_FIRED_BY_INSERT(event) \
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(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
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TRIGGER_EVENT_INSERT)
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#define TRIGGER_FIRED_BY_DELETE(event) \
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(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
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TRIGGER_EVENT_DELETE)
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#define TRIGGER_FIRED_BY_UPDATE(event) \
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(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
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TRIGGER_EVENT_UPDATE)
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#define TRIGGER_FIRED_FOR_ROW(event) \
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((TriggerEvent) (event) & TRIGGER_EVENT_ROW)
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#define TRIGGER_FIRED_FOR_STATEMENT(event) \
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(!TRIGGER_FIRED_FOR_ROW (event))
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#define TRIGGER_FIRED_BEFORE(event) \
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((TriggerEvent) (event) & TRIGGER_EVENT_BEFORE)
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#define TRIGGER_FIRED_AFTER(event) \
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(!TRIGGER_FIRED_BEFORE (event))
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/*
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* RI trigger function arguments are stored in pg_trigger.tgargs bytea
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*
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* constrname\0fkrel\0pkrel\0matchtype\0fkatt\0pkatt\0fkatt\0pkatt\0...
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*
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* There are one or more pairs of fkatt/pkatt names.
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*
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* The relation names are no longer of much use since they are not
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* guaranteed unique; they are present only for backwards compatibility.
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* Use the tgrelid and tgconstrrelid fields to identify the referenced
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* relations, instead. (But note that which is which will depend on which
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* trigger you are looking at!)
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*/
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#define RI_CONSTRAINT_NAME_ARGNO 0
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#define RI_FK_RELNAME_ARGNO 1
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#define RI_PK_RELNAME_ARGNO 2
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#define RI_MATCH_TYPE_ARGNO 3
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#define RI_FIRST_ATTNAME_ARGNO 4 /* first attname pair starts here */
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#define RI_KEYPAIR_FK_IDX 0
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#define RI_KEYPAIR_PK_IDX 1
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#define RI_MAX_NUMKEYS INDEX_MAX_KEYS
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#define RI_MAX_ARGUMENTS (RI_FIRST_ATTNAME_ARGNO + (RI_MAX_NUMKEYS * 2))
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extern void CreateTrigger(CreateTrigStmt *stmt);
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extern void DropTrigger(Oid relid, const char *trigname);
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extern void RelationRemoveTriggers(Relation rel);
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extern void renametrig(Oid relid, const char *oldname, const char *newname);
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extern void RelationBuildTriggers(Relation relation);
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extern void FreeTriggerDesc(TriggerDesc *trigdesc);
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extern bool equalTriggerDescs(TriggerDesc *trigdesc1, TriggerDesc *trigdesc2);
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extern HeapTuple ExecBRInsertTriggers(EState *estate,
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ResultRelInfo *relinfo,
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HeapTuple trigtuple);
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extern void ExecARInsertTriggers(EState *estate,
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ResultRelInfo *relinfo,
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HeapTuple trigtuple);
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extern bool ExecBRDeleteTriggers(EState *estate,
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ResultRelInfo *relinfo,
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ItemPointer tupleid);
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extern void ExecARDeleteTriggers(EState *estate,
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ResultRelInfo *relinfo,
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ItemPointer tupleid);
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extern HeapTuple ExecBRUpdateTriggers(EState *estate,
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ResultRelInfo *relinfo,
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ItemPointer tupleid,
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HeapTuple newtuple);
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extern void ExecARUpdateTriggers(EState *estate,
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ResultRelInfo *relinfo,
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ItemPointer tupleid,
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HeapTuple newtuple);
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/*
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* Deferred trigger stuff
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*/
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typedef struct DeferredTriggerStatusData
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{
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Oid dts_tgoid;
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bool dts_tgisdeferred;
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} DeferredTriggerStatusData;
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typedef struct DeferredTriggerStatusData *DeferredTriggerStatus;
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typedef struct DeferredTriggerEventItem
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{
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Oid dti_tgoid;
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int32 dti_state;
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} DeferredTriggerEventItem;
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typedef struct DeferredTriggerEventData *DeferredTriggerEvent;
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typedef struct DeferredTriggerEventData
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{
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DeferredTriggerEvent dte_next; /* list link */
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int32 dte_event;
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Oid dte_relid;
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ItemPointerData dte_oldctid;
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ItemPointerData dte_newctid;
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int32 dte_n_items;
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/* dte_item is actually a variable-size array, of length dte_n_items */
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DeferredTriggerEventItem dte_item[1];
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} DeferredTriggerEventData;
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extern void DeferredTriggerInit(void);
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extern void DeferredTriggerBeginXact(void);
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extern void DeferredTriggerEndQuery(void);
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extern void DeferredTriggerEndXact(void);
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extern void DeferredTriggerAbortXact(void);
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extern void DeferredTriggerSetState(ConstraintsSetStmt *stmt);
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/*
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* in utils/adt/ri_triggers.c
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*/
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extern bool RI_FKey_keyequal_upd(TriggerData *trigdata);
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#endif /* TRIGGER_H */
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