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Support deferrable uniqueness constraints.

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The current implementation fires an AFTER ROW trigger for each tuple that
looks like it might be non-unique according to the index contents at the
time of insertion.  This works well as long as there aren't many conflicts,
but won't scale to massive unique-key reassignments.  Improving that case
is a TODO item.

Dean Rasheed
This commit is contained in:
Tom Lane
2009-07-29 20:56:21 +00:00
parent 8504905793
commit 25d9bf2e3e
51 changed files with 1241 additions and 245 deletions
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10
src/include/commands/trigger.h
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/trigger.h,v 1.74 2009/07/28 02:56:31 tgl Exp $
* $PostgreSQL: pgsql/src/include/commands/trigger.h,v 1.75 2009/07/29 20:56:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -105,7 +105,7 @@ extern PGDLLIMPORT int SessionReplicationRole;
#define TRIGGER_DISABLED 'D'
extern Oid CreateTrigger(CreateTrigStmt *stmt,
Oid constraintOid, Oid indexOid,
Oid constraintOid, Oid indexOid, const char *prefix,
bool checkPermissions);
extern void DropTrigger(Oid relid, const char *trigname,
@ -132,7 +132,8 @@ extern HeapTuple ExecBRInsertTriggers(EState *estate,
HeapTuple trigtuple);
extern void ExecARInsertTriggers(EState *estate,
ResultRelInfo *relinfo,
HeapTuple trigtuple);
HeapTuple trigtuple,
List *recheckIndexes);
extern void ExecBSDeleteTriggers(EState *estate,
ResultRelInfo *relinfo);
extern void ExecASDeleteTriggers(EState *estate,
@ -154,7 +155,8 @@ extern HeapTuple ExecBRUpdateTriggers(EState *estate,
extern void ExecARUpdateTriggers(EState *estate,
ResultRelInfo *relinfo,
ItemPointer tupleid,
HeapTuple newtuple);
HeapTuple newtuple,
List *recheckIndexes);
extern void ExecBSTruncateTriggers(EState *estate,
ResultRelInfo *relinfo);
extern void ExecASTruncateTriggers(EState *estate,