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

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
doc/src/sgml/catalogs.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.209 2009/10/07 22:14:14 alvherre Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.210 2009/10/14 22:14:21 tgl Exp $ -->
<!--
Documentation of the system catalogs, directed toward PostgreSQL developers
-->
@ -4745,8 +4745,9 @@
<row>
<entry><structfield>tgattr</structfield></entry>
<entry><type>int2vector</type></entry>
<entry></entry>
<entry>Currently unused</entry>
<entry><literal><link linkend="catalog-pg-attribute"><structname>pg_attribute</structname></link>.attnum</literal></entry>
<entry>column numbers, if trigger is column-specific; otherwise an
empty array</entry>
</row>
<row>
@ -4759,6 +4760,14 @@
</tgroup>
</table>
<para>
Currently, column-specific triggering is supported only for
<literal>UPDATE</> events, and so <structfield>tgattr</> is relevant
only for that event type. <structfield>tgtype</structfield> might
contain bits for other event types as well, but those are presumed
to be table-wide regardless of what is in <structfield>tgattr</>.
</para>
<note>
<para>
When <structfield>tgconstraint</> is nonzero,

44
doc/src/sgml/ref/create_trigger.sgml
View File

@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/create_trigger.sgml,v 1.50 2009/09/19 10:23:27 petere Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/create_trigger.sgml,v 1.51 2009/10/14 22:14:21 tgl Exp $
PostgreSQL documentation
-->
@ -49,7 +49,7 @@ CREATE TRIGGER <replaceable class="PARAMETER">name</replaceable> { BEFORE | AFTE
current row, or change the row being inserted (for
<command>INSERT</command> and <command>UPDATE</command> operations
only). If the trigger fires after the event, all changes, including
the last insertion, update, or deletion, are <quote>visible</quote>
the effects of other triggers, are <quote>visible</quote>
to the trigger.
</para>
@ -122,6 +122,16 @@ CREATE TRIGGER <replaceable class="PARAMETER">name</replaceable> { BEFORE | AFTE
this specifies the event that will fire the trigger. Multiple
events can be specified using <literal>OR</literal>.
</para>
<para>
For <command>UPDATE</command> triggers, it is possible to
specify a list of columns using this syntax:
<synopsis>
UPDATE OF <replaceable>column_name1</replaceable> [, <replaceable>column_name2</replaceable> ... ]
</synopsis>
The trigger will only fire if at least one of the listed columns
is mentioned as a target of the update.
</para>
</listitem>
</varlistentry>
@ -169,8 +179,8 @@ CREATE TRIGGER <replaceable class="PARAMETER">name</replaceable> { BEFORE | AFTE
literal string constants. Simple names and numeric constants
can be written here, too, but they will all be converted to
strings. Please check the description of the implementation
language of the trigger function about how the trigger arguments
are accessible within the function; it might be different from
language of the trigger function to find out how these arguments
can be accessed within the function; it might be different from
normal function arguments.
</para>
</listitem>
@ -191,6 +201,18 @@ CREATE TRIGGER <replaceable class="PARAMETER">name</replaceable> { BEFORE | AFTE
endterm="sql-droptrigger-title"> to remove a trigger.
</para>
<para>
A column-specific trigger (<literal>FOR UPDATE OF
<replaceable>column_name</replaceable></literal>) will fire when any
of its columns are listed as targets in the <command>UPDATE</>
command's <literal>SET</> list. It is possible for a column's value
to change even when the trigger is not fired, because changes made to the
row's contents by <literal>BEFORE UPDATE</> triggers are not considered.
Conversely, a command such as <literal>UPDATE ... SET x = x ...</>
will fire a trigger on column <literal>x</>, even though the column's
value did not change.
</para>
<para>
In <productname>PostgreSQL</productname> versions before 7.3, it was
necessary to declare trigger functions as returning the placeholder
@ -218,13 +240,6 @@ CREATE TRIGGER <replaceable class="PARAMETER">name</replaceable> { BEFORE | AFTE
<acronym>SQL</> standard. The following functionality is currently missing:
<itemizedlist>
<listitem>
<para>
SQL allows triggers to fire on updates to specific columns
(e.g., <literal>AFTER UPDATE OF col1, col2</literal>).
</para>
</listitem>
<listitem>
<para>
SQL allows you to define aliases for the <quote>old</quote>
@ -264,9 +279,10 @@ CREATE TRIGGER <replaceable class="PARAMETER">name</replaceable> { BEFORE | AFTE
The <productname>PostgreSQL</productname> behavior is for <literal>BEFORE
DELETE</literal> to always fire before the delete action, even a cascading
one. This is considered more consistent. There is also unpredictable
behavior when <literal>BEFORE</literal> triggers modify rows that are later
to be modified by referential actions. This can lead to constraint violations
or stored data that does not honor the referential constraint.
behavior when <literal>BEFORE</literal> triggers modify rows or prevent
updates during an update that is caused by a referential action. This can
lead to constraint violations or stored data that does not honor the
referential constraint.
</para>
<para>

13
doc/src/sgml/trigger.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/trigger.sgml,v 1.58 2009/08/04 22:04:37 petere Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/trigger.sgml,v 1.59 2009/10/14 22:14:21 tgl Exp $ -->
<chapter id="triggers">
<title>Triggers</title>
@ -36,10 +36,13 @@
performed. Triggers can be defined to execute either before or after any
<command>INSERT</command>, <command>UPDATE</command>, or
<command>DELETE</command> operation, either once per modified row,
or once per <acronym>SQL</acronym> statement. Triggers can also fire
for <command>TRUNCATE</command> statements. If a trigger event occurs,
the trigger's function is called at the appropriate time to handle the
event.
or once per <acronym>SQL</acronym> statement.
<command>UPDATE</command> triggers can moreover be set to fire only if
certain columns are mentioned in the <literal>SET</literal> clause of the
<command>UPDATE</command> statement.
Triggers can also fire for <command>TRUNCATE</command> statements.
If a trigger event occurs, the trigger's function is called at the
appropriate time to handle the event.
</para>
<para>

3
src/backend/catalog/index.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/catalog/index.c,v 1.322 2009/10/05 19:24:35 tgl Exp $
* $PostgreSQL: pgsql/src/backend/catalog/index.c,v 1.323 2009/10/14 22:14:21 tgl Exp $
*
*
* INTERFACE ROUTINES
@ -792,6 +792,7 @@ index_create(Oid heapRelationId,
trigger->before = false;
trigger->row = true;
trigger->events = TRIGGER_TYPE_INSERT | TRIGGER_TYPE_UPDATE;
trigger->columns = NIL;
trigger->isconstraint = true;
trigger->deferrable = true;
trigger->initdeferred = initdeferred;

5
src/backend/commands/tablecmds.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.303 2009/10/13 00:53:07 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.304 2009/10/14 22:14:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -5441,6 +5441,7 @@ CreateFKCheckTrigger(RangeVar *myRel, Constraint *fkconstraint,
fk_trigger->events = TRIGGER_TYPE_UPDATE;
}
fk_trigger->columns = NIL;
fk_trigger->isconstraint = true;
fk_trigger->deferrable = fkconstraint->deferrable;
fk_trigger->initdeferred = fkconstraint->initdeferred;
@ -5491,6 +5492,7 @@ createForeignKeyTriggers(Relation rel, Constraint *fkconstraint,
fk_trigger->before = false;
fk_trigger->row = true;
fk_trigger->events = TRIGGER_TYPE_DELETE;
fk_trigger->columns = NIL;
fk_trigger->isconstraint = true;
fk_trigger->constrrel = myRel;
switch (fkconstraint->fk_del_action)
@ -5543,6 +5545,7 @@ createForeignKeyTriggers(Relation rel, Constraint *fkconstraint,
fk_trigger->before = false;
fk_trigger->row = true;
fk_trigger->events = TRIGGER_TYPE_UPDATE;
fk_trigger->columns = NIL;
fk_trigger->isconstraint = true;
fk_trigger->constrrel = myRel;
switch (fkconstraint->fk_upd_action)

261
src/backend/commands/trigger.c
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/trigger.c,v 1.253 2009/10/10 01:43:45 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/trigger.c,v 1.254 2009/10/14 22:14:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -30,8 +30,11 @@
#include "executor/executor.h"
#include "executor/instrument.h"
#include "miscadmin.h"
#include "nodes/bitmapset.h"
#include "nodes/makefuncs.h"
#include "parser/parse_func.h"
#include "parser/parse_relation.h"
#include "parser/parsetree.h"
#include "pgstat.h"
#include "storage/bufmgr.h"
#include "tcop/utility.h"
@ -51,6 +54,9 @@
int SessionReplicationRole = SESSION_REPLICATION_ROLE_ORIGIN;
#define GetModifiedColumns(relinfo, estate) \
(rt_fetch((relinfo)->ri_RangeTableIndex, (estate)->es_range_table)->modifiedCols)
/* Local function prototypes */
static void ConvertTriggerToFK(CreateTrigStmt *stmt, Oid funcoid);
static void InsertTrigger(TriggerDesc *trigdesc, Trigger *trigger, int indx);
@ -59,6 +65,8 @@ static HeapTuple GetTupleForTrigger(EState *estate,
ResultRelInfo *relinfo,
ItemPointer tid,
TupleTableSlot **newSlot);
static bool TriggerEnabled(Trigger *trigger, TriggerEvent event,
Bitmapset *modifiedCols);
static HeapTuple ExecCallTriggerFunc(TriggerData *trigdata,
int tgindx,
FmgrInfo *finfo,
@ -66,7 +74,7 @@ static HeapTuple ExecCallTriggerFunc(TriggerData *trigdata,
MemoryContext per_tuple_context);
static void AfterTriggerSaveEvent(ResultRelInfo *relinfo, int event,
bool row_trigger, HeapTuple oldtup, HeapTuple newtup,
List *recheckIndexes);
List *recheckIndexes, Bitmapset *modifiedCols);
/*
@ -98,6 +106,8 @@ CreateTrigger(CreateTrigStmt *stmt,
bool checkPermissions)
{
int16 tgtype;
int ncolumns;
int2 *columns;
int2vector *tgattr;
Datum values[Natts_pg_trigger];
bool nulls[Natts_pg_trigger];
@ -337,8 +347,44 @@ CreateTrigger(CreateTrigStmt *stmt,
CStringGetDatum(""));
}
/* tgattr is currently always a zero-length array */
tgattr = buildint2vector(NULL, 0);
/* build column number array if it's a column-specific trigger */
ncolumns = list_length(stmt->columns);
if (ncolumns == 0)
columns = NULL;
else
{
ListCell *cell;
int i = 0;
columns = (int2 *) palloc(ncolumns * sizeof(int2));
foreach(cell, stmt->columns)
{
char *name = strVal(lfirst(cell));
int2 attnum;
int j;
/* Lookup column name. System columns are not allowed */
attnum = attnameAttNum(rel, name, false);
if (attnum == InvalidAttrNumber)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("column \"%s\" of relation \"%s\" does not exist",
name, RelationGetRelationName(rel))));
/* Check for duplicates */
for (j = i - 1; j >= 0; j--)
{
if (columns[j] == attnum)
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_COLUMN),
errmsg("column \"%s\" specified more than once",
name)));
}
columns[i++] = attnum;
}
}
tgattr = buildint2vector(columns, ncolumns);
values[Anum_pg_trigger_tgattr - 1] = PointerGetDatum(tgattr);
tuple = heap_form_tuple(tgrel->rd_att, values, nulls);
@ -358,6 +404,7 @@ CreateTrigger(CreateTrigStmt *stmt,
pfree(DatumGetPointer(values[Anum_pg_trigger_tgname - 1]));
pfree(DatumGetPointer(values[Anum_pg_trigger_tgargs - 1]));
pfree(DatumGetPointer(values[Anum_pg_trigger_tgattr - 1]));
/*
* Update relation's pg_class entry. Crucial side-effect: other backends
@ -434,6 +481,20 @@ CreateTrigger(CreateTrigStmt *stmt,
Assert(!OidIsValid(indexOid));
}
/* If column-specific trigger, add normal dependencies on columns */
if (columns != NULL)
{
int i;
referenced.classId = RelationRelationId;
referenced.objectId = RelationGetRelid(rel);
for (i = 0; i < ncolumns; i++)
{
referenced.objectSubId = columns[i];
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
}
/* Keep lock on target rel until end of xact */
heap_close(rel, NoLock);
@ -1626,18 +1687,9 @@ ExecBSInsertTriggers(EState *estate, ResultRelInfo *relinfo)
Trigger *trigger = &trigdesc->triggers[tgindx[i]];
HeapTuple newtuple;
if (SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA)
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_ORIGIN ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
else /* ORIGIN or LOCAL role */
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_REPLICA ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
if (!TriggerEnabled(trigger, LocTriggerData.tg_event, NULL))
continue;
LocTriggerData.tg_trigger = trigger;
newtuple = ExecCallTriggerFunc(&LocTriggerData,
tgindx[i],
@ -1659,7 +1711,7 @@ ExecASInsertTriggers(EState *estate, ResultRelInfo *relinfo)
if (trigdesc && trigdesc->n_after_statement[TRIGGER_EVENT_INSERT] > 0)
AfterTriggerSaveEvent(relinfo, TRIGGER_EVENT_INSERT,
false, NULL, NULL, NIL);
false, NULL, NULL, NIL, NULL);
}
HeapTuple
@ -1685,18 +1737,9 @@ ExecBRInsertTriggers(EState *estate, ResultRelInfo *relinfo,
{
Trigger *trigger = &trigdesc->triggers[tgindx[i]];
if (SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA)
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_ORIGIN ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
else /* ORIGIN or LOCAL role */
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_REPLICA ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
if (!TriggerEnabled(trigger, LocTriggerData.tg_event, NULL))
continue;
LocTriggerData.tg_trigtuple = oldtuple = newtuple;
LocTriggerData.tg_trigtuplebuf = InvalidBuffer;
LocTriggerData.tg_trigger = trigger;
@ -1721,7 +1764,7 @@ ExecARInsertTriggers(EState *estate, ResultRelInfo *relinfo,
if (trigdesc && trigdesc->n_after_row[TRIGGER_EVENT_INSERT] > 0)
AfterTriggerSaveEvent(relinfo, TRIGGER_EVENT_INSERT,
true, NULL, trigtuple, recheckIndexes);
true, NULL, trigtuple, recheckIndexes, NULL);
}
void
@ -1757,18 +1800,9 @@ ExecBSDeleteTriggers(EState *estate, ResultRelInfo *relinfo)
Trigger *trigger = &trigdesc->triggers[tgindx[i]];
HeapTuple newtuple;
if (SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA)
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_ORIGIN ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
else /* ORIGIN or LOCAL role */
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_REPLICA ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
if (!TriggerEnabled(trigger, LocTriggerData.tg_event, NULL))
continue;
LocTriggerData.tg_trigger = trigger;
newtuple = ExecCallTriggerFunc(&LocTriggerData,
tgindx[i],
@ -1790,7 +1824,7 @@ ExecASDeleteTriggers(EState *estate, ResultRelInfo *relinfo)
if (trigdesc && trigdesc->n_after_statement[TRIGGER_EVENT_DELETE] > 0)
AfterTriggerSaveEvent(relinfo, TRIGGER_EVENT_DELETE,
false, NULL, NULL, NIL);
false, NULL, NULL, NIL, NULL);
}
bool
@ -1824,18 +1858,9 @@ ExecBRDeleteTriggers(EState *estate, PlanState *subplanstate,
{
Trigger *trigger = &trigdesc->triggers[tgindx[i]];
if (SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA)
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_ORIGIN ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
else /* ORIGIN or LOCAL role */
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_REPLICA ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
if (!TriggerEnabled(trigger, LocTriggerData.tg_event, NULL))
continue;
LocTriggerData.tg_trigtuple = trigtuple;
LocTriggerData.tg_trigtuplebuf = InvalidBuffer;
LocTriggerData.tg_trigger = trigger;
@ -1869,7 +1894,7 @@ ExecARDeleteTriggers(EState *estate, ResultRelInfo *relinfo,
tupleid, NULL);
AfterTriggerSaveEvent(relinfo, TRIGGER_EVENT_DELETE,
true, trigtuple, NULL, NIL);
true, trigtuple, NULL, NIL, NULL);
heap_freetuple(trigtuple);
}
}
@ -1882,6 +1907,7 @@ ExecBSUpdateTriggers(EState *estate, ResultRelInfo *relinfo)
int *tgindx;
int i;
TriggerData LocTriggerData;
Bitmapset *modifiedCols;
trigdesc = relinfo->ri_TrigDesc;
@ -1894,6 +1920,8 @@ ExecBSUpdateTriggers(EState *estate, ResultRelInfo *relinfo)
if (ntrigs == 0)
return;
modifiedCols = GetModifiedColumns(relinfo, estate);
LocTriggerData.type = T_TriggerData;
LocTriggerData.tg_event = TRIGGER_EVENT_UPDATE |
TRIGGER_EVENT_BEFORE;
@ -1907,18 +1935,9 @@ ExecBSUpdateTriggers(EState *estate, ResultRelInfo *relinfo)
Trigger *trigger = &trigdesc->triggers[tgindx[i]];
HeapTuple newtuple;
if (SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA)
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_ORIGIN ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
else /* ORIGIN or LOCAL role */
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_REPLICA ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
if (!TriggerEnabled(trigger, LocTriggerData.tg_event, modifiedCols))
continue;
LocTriggerData.tg_trigger = trigger;
newtuple = ExecCallTriggerFunc(&LocTriggerData,
tgindx[i],
@ -1940,7 +1959,8 @@ ExecASUpdateTriggers(EState *estate, ResultRelInfo *relinfo)
if (trigdesc && trigdesc->n_after_statement[TRIGGER_EVENT_UPDATE] > 0)
AfterTriggerSaveEvent(relinfo, TRIGGER_EVENT_UPDATE,
false, NULL, NULL, NIL);
false, NULL, NULL, NIL,
GetModifiedColumns(relinfo, estate));
}
HeapTuple
@ -1957,6 +1977,7 @@ ExecBRUpdateTriggers(EState *estate, PlanState *subplanstate,
HeapTuple intuple = newtuple;
TupleTableSlot *newSlot;
int i;
Bitmapset *modifiedCols;
trigtuple = GetTupleForTrigger(estate, subplanstate, relinfo, tupleid,
&newSlot);
@ -1971,6 +1992,8 @@ ExecBRUpdateTriggers(EState *estate, PlanState *subplanstate,
if (newSlot != NULL)
intuple = newtuple = ExecRemoveJunk(relinfo->ri_junkFilter, newSlot);
modifiedCols = GetModifiedColumns(relinfo, estate);
LocTriggerData.type = T_TriggerData;
LocTriggerData.tg_event = TRIGGER_EVENT_UPDATE |
TRIGGER_EVENT_ROW |
@ -1980,18 +2003,9 @@ ExecBRUpdateTriggers(EState *estate, PlanState *subplanstate,
{
Trigger *trigger = &trigdesc->triggers[tgindx[i]];
if (SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA)
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_ORIGIN ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
else /* ORIGIN or LOCAL role */
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_REPLICA ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
if (!TriggerEnabled(trigger, LocTriggerData.tg_event, modifiedCols))
continue;
LocTriggerData.tg_trigtuple = trigtuple;
LocTriggerData.tg_newtuple = oldtuple = newtuple;
LocTriggerData.tg_trigtuplebuf = InvalidBuffer;
@ -2024,7 +2038,8 @@ ExecARUpdateTriggers(EState *estate, ResultRelInfo *relinfo,
tupleid, NULL);
AfterTriggerSaveEvent(relinfo, TRIGGER_EVENT_UPDATE,
true, trigtuple, newtuple, recheckIndexes);
true, trigtuple, newtuple, recheckIndexes,
GetModifiedColumns(relinfo, estate));
heap_freetuple(trigtuple);
}
}
@ -2062,18 +2077,9 @@ ExecBSTruncateTriggers(EState *estate, ResultRelInfo *relinfo)
Trigger *trigger = &trigdesc->triggers[tgindx[i]];
HeapTuple newtuple;
if (SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA)
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_ORIGIN ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
else /* ORIGIN or LOCAL role */
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_REPLICA ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
if (!TriggerEnabled(trigger, LocTriggerData.tg_event, NULL))
continue;
LocTriggerData.tg_trigger = trigger;
newtuple = ExecCallTriggerFunc(&LocTriggerData,
tgindx[i],
@ -2095,7 +2101,7 @@ ExecASTruncateTriggers(EState *estate, ResultRelInfo *relinfo)
if (trigdesc && trigdesc->n_after_statement[TRIGGER_EVENT_TRUNCATE] > 0)
AfterTriggerSaveEvent(relinfo, TRIGGER_EVENT_TRUNCATE,
false, NULL, NULL, NIL);
false, NULL, NULL, NIL, NULL);
}
@ -2201,6 +2207,52 @@ ltrmark:;
return result;
}
/*
* Is trigger enabled to fire?
*/
static bool
TriggerEnabled(Trigger *trigger, TriggerEvent event, Bitmapset *modifiedCols)
{
/* Check replication-role-dependent enable state */
if (SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA)
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_ORIGIN ||
trigger->tgenabled == TRIGGER_DISABLED)
return false;
}
else /* ORIGIN or LOCAL role */
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_REPLICA ||
trigger->tgenabled == TRIGGER_DISABLED)
return false;
}
/*
* Check for column-specific trigger (only possible for UPDATE, and in
* fact we *must* ignore tgattr for other event types)
*/
if (trigger->tgnattr > 0 && TRIGGER_FIRED_BY_UPDATE(event))
{
int i;
bool modified;
modified = false;
for (i = 0; i < trigger->tgnattr; i++)
{
if (bms_is_member(trigger->tgattr[i] - FirstLowInvalidHeapAttributeNumber,
modifiedCols))
{
modified = true;
break;
}
}
if (!modified)
return false;
}
return true;
}
/* ----------
* After-trigger stuff
@ -3825,7 +3877,7 @@ AfterTriggerPendingOnRel(Oid relid)
static void
AfterTriggerSaveEvent(ResultRelInfo *relinfo, int event, bool row_trigger,
HeapTuple oldtup, HeapTuple newtup,
List *recheckIndexes)
List *recheckIndexes, Bitmapset *modifiedCols)
{
Relation rel = relinfo->ri_RelationDesc;
TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
@ -3927,26 +3979,15 @@ AfterTriggerSaveEvent(ResultRelInfo *relinfo, int event, bool row_trigger,
{
Trigger *trigger = &trigdesc->triggers[tgindx[i]];
/* Ignore disabled triggers */
if (SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA)
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_ORIGIN ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
else /* ORIGIN or LOCAL role */
{
if (trigger->tgenabled == TRIGGER_FIRES_ON_REPLICA ||
trigger->tgenabled == TRIGGER_DISABLED)
continue;
}
if (!TriggerEnabled(trigger, event, modifiedCols))
continue;
/*
* If this is an UPDATE of a PK table or FK table that does not change
* the PK or FK respectively, we can skip queuing the event: there is
* no need to fire the trigger.
*/
if ((event & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_UPDATE)
if (TRIGGER_FIRED_BY_UPDATE(event))
{
switch (RI_FKey_trigger_type(trigger->tgfoid))
{

3
src/backend/nodes/copyfuncs.c
View File

@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.447 2009/10/13 00:53:08 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.448 2009/10/14 22:14:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -3160,6 +3160,7 @@ _copyCreateTrigStmt(CreateTrigStmt *from)
COPY_SCALAR_FIELD(before);
COPY_SCALAR_FIELD(row);
COPY_SCALAR_FIELD(events);
COPY_NODE_FIELD(columns);
COPY_SCALAR_FIELD(isconstraint);
COPY_SCALAR_FIELD(deferrable);
COPY_SCALAR_FIELD(initdeferred);

3
src/backend/nodes/equalfuncs.c
View File

@ -22,7 +22,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.369 2009/10/13 00:53:08 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.370 2009/10/14 22:14:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1671,6 +1671,7 @@ _equalCreateTrigStmt(CreateTrigStmt *a, CreateTrigStmt *b)
COMPARE_SCALAR_FIELD(before);
COMPARE_SCALAR_FIELD(row);
COMPARE_SCALAR_FIELD(events);
COMPARE_NODE_FIELD(columns);
COMPARE_SCALAR_FIELD(isconstraint);
COMPARE_SCALAR_FIELD(deferrable);
COMPARE_SCALAR_FIELD(initdeferred);

5
src/backend/optimizer/plan/setrefs.c
View File

@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.152 2009/10/12 18:10:48 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.153 2009/10/14 22:14:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -193,7 +193,8 @@ set_plan_references(PlannerGlobal *glob, Plan *plan,
* needed by the executor; this reduces the storage space and copying cost
* for cached plans. We keep only the alias and eref Alias fields, which
* are needed by EXPLAIN, and the selectedCols and modifiedCols bitmaps,
* which are needed for executor-startup permissions checking.
* which are needed for executor-startup permissions checking and for
* trigger event checking.
*/
foreach(lc, rtable)
{

41
src/backend/parser/gram.y
View File

@ -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:

19
src/backend/utils/adt/ruleutils.c
View File

@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.309 2009/10/10 01:43:49 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.310 2009/10/14 22:14:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -543,6 +543,23 @@ pg_get_triggerdef_worker(Oid trigid, bool pretty)
appendStringInfo(&buf, " OR UPDATE");
else
appendStringInfo(&buf, " UPDATE");
/* tgattr is first var-width field, so OK to access directly */
if (trigrec->tgattr.dim1 > 0)
{
int i;
appendStringInfoString(&buf, " OF ");
for (i = 0; i < trigrec->tgattr.dim1; i++)
{
char *attname;
if (i > 0)
appendStringInfoString(&buf, ", ");
attname = get_relid_attribute_name(trigrec->tgrelid,
trigrec->tgattr.values[i]);
appendStringInfoString(&buf, quote_identifier(attname));
}
}
}
if (TRIGGER_FOR_TRUNCATE(trigrec->tgtype))
{

14
src/bin/pg_dump/pg_dump.c
View File

@ -12,7 +12,7 @@
* by PostgreSQL
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_dump.c,v 1.551 2009/10/12 23:41:43 tgl Exp $
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_dump.c,v 1.552 2009/10/14 22:14:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -4419,6 +4419,18 @@ getTriggers(TableInfo tblinfo[], int numTables)
if (i_tgdef >= 0)
{
tginfo[j].tgdef = strdup(PQgetvalue(res, j, i_tgdef));
/* remaining fields are not valid if we have tgdef */
tginfo[j].tgfname = NULL;
tginfo[j].tgtype = 0;
tginfo[j].tgnargs = 0;
tginfo[j].tgargs = NULL;
tginfo[j].tgisconstraint = false;
tginfo[j].tgdeferrable = false;
tginfo[j].tginitdeferred = false;
tginfo[j].tgconstrname = NULL;
tginfo[j].tgconstrrelid = InvalidOid;
tginfo[j].tgconstrrelname = NULL;
}
else
{

4
src/include/catalog/catversion.h
View File

@ -37,7 +37,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.545 2009/10/12 18:10:51 tgl Exp $
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.546 2009/10/14 22:14:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 200910121
#define CATALOG_VERSION_NO 200910141
#endif

6
src/include/catalog/pg_trigger.h
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/catalog/pg_trigger.h,v 1.34 2009/07/28 02:56:31 tgl Exp $
* $PostgreSQL: pgsql/src/include/catalog/pg_trigger.h,v 1.35 2009/10/14 22:14:24 tgl Exp $
*
* NOTES
* the genbki.sh script reads this file and generates .bki
@ -52,8 +52,8 @@ CATALOG(pg_trigger,2620)
bool tginitdeferred; /* constraint trigger is deferred initially */
int2 tgnargs; /* # of extra arguments in tgargs */
/* VARIABLE LENGTH FIELDS: */
int2vector tgattr; /* reserved for column-specific triggers */
/* VARIABLE LENGTH FIELDS (note: these are not supposed to be null) */
int2vector tgattr; /* column numbers, if trigger is on columns */
bytea tgargs; /* first\000second\000tgnargs\000 */
} FormData_pg_trigger;

8
src/include/nodes/parsenodes.h
View File

@ -13,7 +13,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.409 2009/10/13 00:53:08 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.410 2009/10/14 22:14:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1560,10 +1560,9 @@ typedef struct DropUserMappingStmt
} DropUserMappingStmt;
/* ----------------------
* Create/Drop TRIGGER Statements
* Create TRIGGER Statement
* ----------------------
*/
typedef struct CreateTrigStmt
{
NodeTag type;
@ -1575,6 +1574,7 @@ typedef struct CreateTrigStmt
bool row; /* ROW/STATEMENT */
/* events uses the TRIGGER_TYPE bits defined in catalog/pg_trigger.h */
int16 events; /* INSERT/UPDATE/DELETE/TRUNCATE */
List *columns; /* column names, or NIL for all columns */
/* The following are used for constraint triggers (RI and unique checks) */
bool isconstraint; /* This is a constraint trigger */
@ -1584,7 +1584,7 @@ typedef struct CreateTrigStmt
} CreateTrigStmt;
/* ----------------------
* Create/Drop PROCEDURAL LANGUAGE Statement
* Create/Drop PROCEDURAL LANGUAGE Statements
* ----------------------
*/
typedef struct CreatePLangStmt

119
src/test/regress/expected/triggers.out
View File

@ -278,37 +278,37 @@ CREATE TABLE main_table (a int, b int);
COPY main_table (a,b) FROM stdin;
CREATE FUNCTION trigger_func() RETURNS trigger LANGUAGE plpgsql AS '
BEGIN
RAISE NOTICE ''trigger_func() called: action = %, when = %, level = %'', TG_OP, TG_WHEN, TG_LEVEL;
RAISE NOTICE ''trigger_func(%) called: action = %, when = %, level = %'', TG_ARGV[0], TG_OP, TG_WHEN, TG_LEVEL;
RETURN NULL;
END;';
CREATE TRIGGER before_ins_stmt_trig BEFORE INSERT ON main_table
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func();
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func('before_ins_stmt');
CREATE TRIGGER after_ins_stmt_trig AFTER INSERT ON main_table
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func();
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func('after_ins_stmt');
--
-- if neither 'FOR EACH ROW' nor 'FOR EACH STATEMENT' was specified,
-- CREATE TRIGGER should default to 'FOR EACH STATEMENT'
--
CREATE TRIGGER before_upd_stmt_trig AFTER UPDATE ON main_table
EXECUTE PROCEDURE trigger_func();
CREATE TRIGGER before_upd_row_trig AFTER UPDATE ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func();
CREATE TRIGGER after_upd_stmt_trig AFTER UPDATE ON main_table
EXECUTE PROCEDURE trigger_func('after_upd_stmt');
CREATE TRIGGER after_upd_row_trig AFTER UPDATE ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('after_upd_row');
INSERT INTO main_table DEFAULT VALUES;
NOTICE: trigger_func() called: action = INSERT, when = BEFORE, level = STATEMENT
NOTICE: trigger_func() called: action = INSERT, when = AFTER, level = STATEMENT
NOTICE: trigger_func(before_ins_stmt) called: action = INSERT, when = BEFORE, level = STATEMENT
NOTICE: trigger_func(after_ins_stmt) called: action = INSERT, when = AFTER, level = STATEMENT
UPDATE main_table SET a = a + 1 WHERE b < 30;
NOTICE: trigger_func() called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func() called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func() called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func() called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func() called: action = UPDATE, when = AFTER, level = STATEMENT
NOTICE: trigger_func(after_upd_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_stmt) called: action = UPDATE, when = AFTER, level = STATEMENT
-- UPDATE that effects zero rows should still call per-statement trigger
UPDATE main_table SET a = a + 2 WHERE b > 100;
NOTICE: trigger_func() called: action = UPDATE, when = AFTER, level = STATEMENT
NOTICE: trigger_func(after_upd_stmt) called: action = UPDATE, when = AFTER, level = STATEMENT
-- COPY should fire per-row and per-statement INSERT triggers
COPY main_table (a, b) FROM stdin;
NOTICE: trigger_func() called: action = INSERT, when = BEFORE, level = STATEMENT
NOTICE: trigger_func() called: action = INSERT, when = AFTER, level = STATEMENT
NOTICE: trigger_func(before_ins_stmt) called: action = INSERT, when = BEFORE, level = STATEMENT
NOTICE: trigger_func(after_ins_stmt) called: action = INSERT, when = AFTER, level = STATEMENT
SELECT * FROM main_table ORDER BY a, b;
a | b
----+----
@ -322,6 +322,91 @@ SELECT * FROM main_table ORDER BY a, b;
|
(8 rows)
-- Test column-level triggers
DROP TRIGGER after_upd_row_trig ON main_table;
CREATE TRIGGER before_upd_a_row_trig BEFORE UPDATE OF a ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('before_upd_a_row');
CREATE TRIGGER after_upd_b_row_trig AFTER UPDATE OF b ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('after_upd_b_row');
CREATE TRIGGER after_upd_a_b_row_trig AFTER UPDATE OF a, b ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('after_upd_a_b_row');
CREATE TRIGGER before_upd_a_stmt_trig BEFORE UPDATE OF a ON main_table
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func('before_upd_a_stmt');
CREATE TRIGGER after_upd_b_stmt_trig AFTER UPDATE OF b ON main_table
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func('after_upd_b_stmt');
SELECT pg_get_triggerdef(oid) FROM pg_trigger WHERE tgrelid = 'main_table'::regclass AND tgname = 'after_upd_a_b_row_trig';
pg_get_triggerdef
-------------------------------------------------------------------------------------------------------------------------------------------
CREATE TRIGGER after_upd_a_b_row_trig AFTER UPDATE OF a, b ON main_table FOR EACH ROW EXECUTE PROCEDURE trigger_func('after_upd_a_b_row')
(1 row)
SELECT pg_get_triggerdef(oid, true) FROM pg_trigger WHERE tgrelid = 'main_table'::regclass AND tgname = 'after_upd_a_b_row_trig';
pg_get_triggerdef
---------------------------------------------------------
CREATE TRIGGER after_upd_a_b_row_trig
AFTER UPDATE OF a, b ON main_table
FOR EACH ROW
EXECUTE PROCEDURE trigger_func('after_upd_a_b_row')
(1 row)
UPDATE main_table SET a = 50;
NOTICE: trigger_func(before_upd_a_stmt) called: action = UPDATE, when = BEFORE, level = STATEMENT
NOTICE: trigger_func(before_upd_a_row) called: action = UPDATE, when = BEFORE, level = ROW
NOTICE: trigger_func(before_upd_a_row) called: action = UPDATE, when = BEFORE, level = ROW
NOTICE: trigger_func(before_upd_a_row) called: action = UPDATE, when = BEFORE, level = ROW
NOTICE: trigger_func(before_upd_a_row) called: action = UPDATE, when = BEFORE, level = ROW
NOTICE: trigger_func(before_upd_a_row) called: action = UPDATE, when = BEFORE, level = ROW
NOTICE: trigger_func(before_upd_a_row) called: action = UPDATE, when = BEFORE, level = ROW
NOTICE: trigger_func(before_upd_a_row) called: action = UPDATE, when = BEFORE, level = ROW
NOTICE: trigger_func(before_upd_a_row) called: action = UPDATE, when = BEFORE, level = ROW
NOTICE: trigger_func(after_upd_stmt) called: action = UPDATE, when = AFTER, level = STATEMENT
UPDATE main_table SET b = 10;
NOTICE: trigger_func(after_upd_a_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_a_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_a_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_a_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_a_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_a_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_a_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_a_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_b_row) called: action = UPDATE, when = AFTER, level = ROW
NOTICE: trigger_func(after_upd_b_stmt) called: action = UPDATE, when = AFTER, level = STATEMENT
NOTICE: trigger_func(after_upd_stmt) called: action = UPDATE, when = AFTER, level = STATEMENT
-- bogus cases
CREATE TRIGGER error_upd_and_col BEFORE UPDATE OR UPDATE OF a ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('error_upd_and_col');
ERROR: duplicate trigger events specified at or near "ON"
LINE 1: ...ER error_upd_and_col BEFORE UPDATE OR UPDATE OF a ON main_ta...
^
CREATE TRIGGER error_upd_a_a BEFORE UPDATE OF a, a ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('error_upd_a_a');
ERROR: column "a" specified more than once
CREATE TRIGGER error_ins_a BEFORE INSERT OF a ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('error_ins_a');
ERROR: syntax error at or near "OF"
LINE 1: CREATE TRIGGER error_ins_a BEFORE INSERT OF a ON main_table
^
-- check dependency restrictions
ALTER TABLE main_table DROP COLUMN b;
ERROR: cannot drop table main_table column b because other objects depend on it
DETAIL: trigger after_upd_b_row_trig on table main_table depends on table main_table column b
trigger after_upd_a_b_row_trig on table main_table depends on table main_table column b
trigger after_upd_b_stmt_trig on table main_table depends on table main_table column b
HINT: Use DROP ... CASCADE to drop the dependent objects too.
-- this should succeed, but we'll roll it back to keep the triggers around
begin;
DROP TRIGGER after_upd_a_b_row_trig ON main_table;
DROP TRIGGER after_upd_b_row_trig ON main_table;
DROP TRIGGER after_upd_b_stmt_trig ON main_table;
ALTER TABLE main_table DROP COLUMN b;
rollback;
-- Test enable/disable triggers
create table trigtest (i serial primary key);
NOTICE: CREATE TABLE will create implicit sequence "trigtest_i_seq" for serial column "trigtest.i"

53
src/test/regress/sql/triggers.sql
View File

@ -220,25 +220,25 @@ COPY main_table (a,b) FROM stdin;
CREATE FUNCTION trigger_func() RETURNS trigger LANGUAGE plpgsql AS '
BEGIN
RAISE NOTICE ''trigger_func() called: action = %, when = %, level = %'', TG_OP, TG_WHEN, TG_LEVEL;
RAISE NOTICE ''trigger_func(%) called: action = %, when = %, level = %'', TG_ARGV[0], TG_OP, TG_WHEN, TG_LEVEL;
RETURN NULL;
END;';
CREATE TRIGGER before_ins_stmt_trig BEFORE INSERT ON main_table
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func();
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func('before_ins_stmt');
CREATE TRIGGER after_ins_stmt_trig AFTER INSERT ON main_table
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func();
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func('after_ins_stmt');
--
-- if neither 'FOR EACH ROW' nor 'FOR EACH STATEMENT' was specified,
-- CREATE TRIGGER should default to 'FOR EACH STATEMENT'
--
CREATE TRIGGER before_upd_stmt_trig AFTER UPDATE ON main_table
EXECUTE PROCEDURE trigger_func();
CREATE TRIGGER after_upd_stmt_trig AFTER UPDATE ON main_table
EXECUTE PROCEDURE trigger_func('after_upd_stmt');
CREATE TRIGGER before_upd_row_trig AFTER UPDATE ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func();
CREATE TRIGGER after_upd_row_trig AFTER UPDATE ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('after_upd_row');
INSERT INTO main_table DEFAULT VALUES;
@ -254,6 +254,45 @@ COPY main_table (a, b) FROM stdin;
SELECT * FROM main_table ORDER BY a, b;
-- Test column-level triggers
DROP TRIGGER after_upd_row_trig ON main_table;
CREATE TRIGGER before_upd_a_row_trig BEFORE UPDATE OF a ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('before_upd_a_row');
CREATE TRIGGER after_upd_b_row_trig AFTER UPDATE OF b ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('after_upd_b_row');
CREATE TRIGGER after_upd_a_b_row_trig AFTER UPDATE OF a, b ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('after_upd_a_b_row');
CREATE TRIGGER before_upd_a_stmt_trig BEFORE UPDATE OF a ON main_table
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func('before_upd_a_stmt');
CREATE TRIGGER after_upd_b_stmt_trig AFTER UPDATE OF b ON main_table
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_func('after_upd_b_stmt');
SELECT pg_get_triggerdef(oid) FROM pg_trigger WHERE tgrelid = 'main_table'::regclass AND tgname = 'after_upd_a_b_row_trig';
SELECT pg_get_triggerdef(oid, true) FROM pg_trigger WHERE tgrelid = 'main_table'::regclass AND tgname = 'after_upd_a_b_row_trig';
UPDATE main_table SET a = 50;
UPDATE main_table SET b = 10;
-- bogus cases
CREATE TRIGGER error_upd_and_col BEFORE UPDATE OR UPDATE OF a ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('error_upd_and_col');
CREATE TRIGGER error_upd_a_a BEFORE UPDATE OF a, a ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('error_upd_a_a');
CREATE TRIGGER error_ins_a BEFORE INSERT OF a ON main_table
FOR EACH ROW EXECUTE PROCEDURE trigger_func('error_ins_a');
-- check dependency restrictions
ALTER TABLE main_table DROP COLUMN b;
-- this should succeed, but we'll roll it back to keep the triggers around
begin;
DROP TRIGGER after_upd_a_b_row_trig ON main_table;
DROP TRIGGER after_upd_b_row_trig ON main_table;
DROP TRIGGER after_upd_b_stmt_trig ON main_table;
ALTER TABLE main_table DROP COLUMN b;
rollback;
-- Test enable/disable triggers
create table trigtest (i serial primary key);