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Support triggers on views.

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This patch adds the SQL-standard concept of an INSTEAD OF trigger, which
is fired instead of performing a physical insert/update/delete.  The
trigger function is passed the entire old and/or new rows of the view,
and must figure out what to do to the underlying tables to implement
the update.  So this feature can be used to implement updatable views
using trigger programming style rather than rule hacking.

In passing, this patch corrects the names of some columns in the
information_schema.triggers view.  It seems the SQL committee renamed
them somewhere between SQL:99 and SQL:2003.

Dean Rasheed, reviewed by Bernd Helmle; some additional hacking by me.
This commit is contained in:
Tom Lane
2010-10-10 13:43:33 -04:00
parent f7b15b5098
commit 2ec993a7cb
47 changed files with 2815 additions and 759 deletions
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58
src/include/commands/trigger.h
View File

@ -51,44 +51,48 @@ typedef struct TriggerData
#define TRIGGER_EVENT_UPDATE 0x00000002
#define TRIGGER_EVENT_TRUNCATE 0x00000003
#define TRIGGER_EVENT_OPMASK 0x00000003
#define TRIGGER_EVENT_ROW 0x00000004
#define TRIGGER_EVENT_BEFORE 0x00000008
#define TRIGGER_EVENT_AFTER 0x00000000
#define TRIGGER_EVENT_INSTEAD 0x00000010
#define TRIGGER_EVENT_TIMINGMASK 0x00000018
/* More TriggerEvent flags, used only within trigger.c */
#define AFTER_TRIGGER_DEFERRABLE 0x00000010
#define AFTER_TRIGGER_INITDEFERRED 0x00000020
#define AFTER_TRIGGER_DEFERRABLE 0x00000020
#define AFTER_TRIGGER_INITDEFERRED 0x00000040
#define TRIGGER_FIRED_BY_INSERT(event) \
(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
TRIGGER_EVENT_INSERT)
#define TRIGGER_FIRED_BY_INSERT(event) \
(((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_DELETE(event) \
(((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_DELETE)
#define TRIGGER_FIRED_BY_UPDATE(event) \
(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
TRIGGER_EVENT_UPDATE)
#define TRIGGER_FIRED_BY_UPDATE(event) \
(((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_UPDATE)
#define TRIGGER_FIRED_BY_TRUNCATE(event) \
(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
TRIGGER_EVENT_TRUNCATE)
(((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_TRUNCATE)
#define TRIGGER_FIRED_FOR_ROW(event) \
((TriggerEvent) (event) & TRIGGER_EVENT_ROW)
#define TRIGGER_FIRED_FOR_ROW(event) \
((event) & TRIGGER_EVENT_ROW)
#define TRIGGER_FIRED_FOR_STATEMENT(event) \
(!TRIGGER_FIRED_FOR_ROW (event))
#define TRIGGER_FIRED_FOR_STATEMENT(event) \
(!TRIGGER_FIRED_FOR_ROW(event))
#define TRIGGER_FIRED_BEFORE(event) \
((TriggerEvent) (event) & TRIGGER_EVENT_BEFORE)
#define TRIGGER_FIRED_BEFORE(event) \
(((event) & TRIGGER_EVENT_TIMINGMASK) == TRIGGER_EVENT_BEFORE)
#define TRIGGER_FIRED_AFTER(event) \
(!TRIGGER_FIRED_BEFORE (event))
#define TRIGGER_FIRED_AFTER(event) \
(((event) & TRIGGER_EVENT_TIMINGMASK) == TRIGGER_EVENT_AFTER)
#define TRIGGER_FIRED_INSTEAD(event) \
(((event) & TRIGGER_EVENT_TIMINGMASK) == TRIGGER_EVENT_INSTEAD)
/*
* Definitions for the replication role based firing.
* Definitions for replication role based firing.
*/
#define SESSION_REPLICATION_ROLE_ORIGIN 0
#define SESSION_REPLICATION_ROLE_REPLICA 1
@ -135,6 +139,9 @@ extern void ExecARInsertTriggers(EState *estate,
ResultRelInfo *relinfo,
HeapTuple trigtuple,
List *recheckIndexes);
extern HeapTuple ExecIRInsertTriggers(EState *estate,
ResultRelInfo *relinfo,
HeapTuple trigtuple);
extern void ExecBSDeleteTriggers(EState *estate,
ResultRelInfo *relinfo);
extern void ExecASDeleteTriggers(EState *estate,
@ -146,6 +153,9 @@ extern bool ExecBRDeleteTriggers(EState *estate,
extern void ExecARDeleteTriggers(EState *estate,
ResultRelInfo *relinfo,
ItemPointer tupleid);
extern bool ExecIRDeleteTriggers(EState *estate,
ResultRelInfo *relinfo,
HeapTuple trigtuple);
extern void ExecBSUpdateTriggers(EState *estate,
ResultRelInfo *relinfo);
extern void ExecASUpdateTriggers(EState *estate,
@ -160,6 +170,10 @@ extern void ExecARUpdateTriggers(EState *estate,
ItemPointer tupleid,
HeapTuple newtuple,
List *recheckIndexes);
extern HeapTuple ExecIRUpdateTriggers(EState *estate,
ResultRelInfo *relinfo,
HeapTuple oldtuple,
HeapTuple newtuple);
extern void ExecBSTruncateTriggers(EState *estate,
ResultRelInfo *relinfo);
extern void ExecASTruncateTriggers(EState *estate,