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Support SQL-compliant triggers on columns, ie fire only if certain columns

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are named in the UPDATE's SET list.

Note: the schema of pg_trigger has not actually changed; we've just started
to use a column that was there all along.  catversion bumped anyway so that
this commit is included in the history of potentially interesting changes
to system catalog contents.

Itagaki Takahiro
This commit is contained in:
Tom Lane
2009-10-14 22:14:25 +00:00
parent be922e8555
commit b2734a0d79
17 changed files with 433 additions and 183 deletions
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41
src/backend/parser/gram.y
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@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.685 2009/10/12 23:41:43 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.686 2009/10/14 22:14:22 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -251,7 +251,7 @@ static TypeName *TableFuncTypeName(List *columns);
%type <boolean> TriggerActionTime TriggerForSpec opt_trusted opt_restart_seqs
%type <ival> TriggerEvents TriggerOneEvent
%type <list> TriggerEvents TriggerOneEvent
%type <value> TriggerFuncArg
%type <str> relation_name copy_file_name
@@ -3240,7 +3240,8 @@ CreateTrigStmt:
n->args = $13;
n->before = $4;
n->row = $8;
n->events = $5;
n->events = intVal(linitial($5));
n->columns = (List *) lsecond($5);
n->isconstraint = FALSE;
n->deferrable = FALSE;
n->initdeferred = FALSE;
@@ -3260,7 +3261,8 @@ CreateTrigStmt:
n->args = $18;
n->before = FALSE;
n->row = TRUE;
n->events = $6;
n->events = intVal(linitial($6));
n->columns = (List *) lsecond($6);
n->isconstraint = TRUE;
n->deferrable = ($10 & 1) != 0;
n->initdeferred = ($10 & 2) != 0;
@@ -3279,17 +3281,36 @@ TriggerEvents:
{ $$ = $1; }
| TriggerEvents OR TriggerOneEvent
{
if ($1 & $3)
int events1 = intVal(linitial($1));
int events2 = intVal(linitial($3));
List *columns1 = (List *) lsecond($1);
List *columns2 = (List *) lsecond($3);
if (events1 & events2)
parser_yyerror("duplicate trigger events specified");
$$ = $1 | $3;
/*
* concat'ing the columns lists loses information about
* which columns went with which event, but so long as
* only UPDATE carries columns and we disallow multiple
* UPDATE items, it doesn't matter. Command execution
* should just ignore the columns for non-UPDATE events.
*/
$$ = list_make2(makeInteger(events1 | events2),
list_concat(columns1, columns2));
}
;
TriggerOneEvent:
INSERT { $$ = TRIGGER_TYPE_INSERT; }
| DELETE_P { $$ = TRIGGER_TYPE_DELETE; }
| UPDATE { $$ = TRIGGER_TYPE_UPDATE; }
| TRUNCATE { $$ = TRIGGER_TYPE_TRUNCATE; }
INSERT
{ $$ = list_make2(makeInteger(TRIGGER_TYPE_INSERT), NIL); }
| DELETE_P
{ $$ = list_make2(makeInteger(TRIGGER_TYPE_DELETE), NIL); }
| UPDATE
{ $$ = list_make2(makeInteger(TRIGGER_TYPE_UPDATE), NIL); }
| UPDATE OF columnList
{ $$ = list_make2(makeInteger(TRIGGER_TYPE_UPDATE), $3); }
| TRUNCATE
{ $$ = list_make2(makeInteger(TRIGGER_TYPE_TRUNCATE), NIL); }
;
TriggerForSpec: