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Second round of fmgr changes: triggers are now invoked in new style,

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CurrentTriggerData is history.
This commit is contained in:
Tom Lane
2000-05-29 01:59:17 +00:00
parent 147ccf5c80
commit 18952f6744
41 changed files with 666 additions and 674 deletions
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46
contrib/noupdate/noup.c
View File

@ -6,7 +6,7 @@
#include "commands/trigger.h" /* -"- and triggers */
#include <ctype.h> /* tolower () */
HeapTuple noup(void);
extern Datum noup(PG_FUNCTION_ARGS);
/*
* noup () -- revoke permission on column
@ -16,9 +16,10 @@ HeapTuple noup(void);
* EXECUTE PROCEDURE noup ('col').
*/
HeapTuple /* have to return HeapTuple to Executor */
noup()
Datum
noup(PG_FUNCTION_ARGS)
{
TriggerData *trigdata = (TriggerData *) fcinfo->context;
Trigger *trigger; /* to get trigger name */
int nargs; /* # of args specified in CREATE TRIGGER */
char **args; /* arguments: column names and table name */
@ -36,42 +37,35 @@ noup()
*/
/* Called by trigger manager ? */
if (!CurrentTriggerData)
elog(WARN, "noup: triggers are not initialized");
if (!CALLED_AS_TRIGGER(fcinfo))
elog(ERROR, "noup: not fired by trigger manager");
/* Should be called for ROW trigger */
if (TRIGGER_FIRED_FOR_STATEMENT(CurrentTriggerData->tg_event))
elog(WARN, "noup: can't process STATEMENT events");
if (TRIGGER_FIRED_FOR_STATEMENT(trigdata->tg_event))
elog(ERROR, "noup: can't process STATEMENT events");
/* Not should be called for INSERT */
if (TRIGGER_FIRED_BY_INSERT(CurrentTriggerData->tg_event))
elog(WARN, "noup: can't process INSERT events");
if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
elog(ERROR, "noup: can't process INSERT events");
/* Not should be called for DELETE */
else if (TRIGGER_FIRED_BY_DELETE(CurrentTriggerData->tg_event))
elog(WARN, "noup: can't process DELETE events");
else if (TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
elog(ERROR, "noup: can't process DELETE events");
/* check new Tuple */
tuple = CurrentTriggerData->tg_newtuple;
tuple = trigdata->tg_newtuple;
trigger = CurrentTriggerData->tg_trigger;
trigger = trigdata->tg_trigger;
nargs = trigger->tgnargs;
args = trigger->tgargs;
nkeys = nargs;
rel = CurrentTriggerData->tg_relation;
rel = trigdata->tg_relation;
tupdesc = rel->rd_att;
/*
* Setting CurrentTriggerData to NULL prevents direct calls to trigger
* functions in queries. Normally, trigger functions have to be called
* by trigger manager code only.
*/
CurrentTriggerData = NULL;
/* Connect to SPI manager */
if ((ret = SPI_connect()) < 0)
elog(WARN, "noup: SPI_connect returned %d", ret);
elog(ERROR, "noup: SPI_connect returned %d", ret);
/*
* We use SPI plan preparation feature, so allocate space to place key
@ -87,7 +81,7 @@ noup()
/* Bad guys may give us un-existing column in CREATE TRIGGER */
if (fnumber < 0)
elog(WARN, "noup: there is no attribute %s in relation %s",
elog(ERROR, "noup: there is no attribute %s in relation %s",
args[i], SPI_getrelname(rel));
/* Well, get binary (in internal format) value of column */
@ -99,13 +93,13 @@ noup()
if (!isnull)
{
elog(WARN, "%s: update not allowed", args[i]);
elog(NOTICE, "%s: update not allowed", args[i]);
SPI_finish();
return NULL;
return PointerGetDatum(NULL);
}
}
SPI_finish();
return (tuple);
return PointerGetDatum(tuple);
}

2
contrib/noupdate/noup.source
View File

@ -3,5 +3,5 @@ DROP FUNCTION noup ();
CREATE FUNCTION noup ()
RETURNS opaque
AS '_OBJWD_/noup_DLSUFFIX_'
LANGUAGE 'c'
LANGUAGE 'newC'
;