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0c90f6769d
The new type has the scope of whole the database cluster so it doesn't behave the same as the existing OID alias types which have database scope, concerning object dependency. To avoid confusion constants of the new type are prohibited from appearing where dependencies are made involving it. Also, add a note to the docs about possible MVCC violation and optimization issues, which are general over the all reg* types. Kyotaro Horiguchi
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/*
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* insert_username.c
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* $Modified: Thu Oct 16 08:13:42 1997 by brook $
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* contrib/spi/insert_username.c
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*
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* insert user name in response to a trigger
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* usage: insert_username (column_name)
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*/
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#include "postgres.h"
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#include "catalog/pg_type.h"
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#include "commands/trigger.h"
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#include "executor/spi.h"
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#include "miscadmin.h"
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#include "utils/builtins.h"
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#include "utils/rel.h"
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PG_MODULE_MAGIC;
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PG_FUNCTION_INFO_V1(insert_username);
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Datum
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insert_username(PG_FUNCTION_ARGS)
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{
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TriggerData *trigdata = (TriggerData *) fcinfo->context;
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Trigger *trigger; /* to get trigger name */
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int nargs; /* # of arguments */
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Datum newval; /* new value of column */
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char **args; /* arguments */
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char *relname; /* triggered relation name */
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Relation rel; /* triggered relation */
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HeapTuple rettuple = NULL;
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TupleDesc tupdesc; /* tuple description */
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int attnum;
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/* sanity checks from autoinc.c */
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if (!CALLED_AS_TRIGGER(fcinfo))
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/* internal error */
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elog(ERROR, "insert_username: not fired by trigger manager");
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if (!TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
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/* internal error */
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elog(ERROR, "insert_username: must be fired for row");
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if (!TRIGGER_FIRED_BEFORE(trigdata->tg_event))
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/* internal error */
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elog(ERROR, "insert_username: must be fired before event");
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if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
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rettuple = trigdata->tg_trigtuple;
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else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
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rettuple = trigdata->tg_newtuple;
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else
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/* internal error */
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elog(ERROR, "insert_username: cannot process DELETE events");
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rel = trigdata->tg_relation;
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relname = SPI_getrelname(rel);
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trigger = trigdata->tg_trigger;
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nargs = trigger->tgnargs;
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if (nargs != 1)
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/* internal error */
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elog(ERROR, "insert_username (%s): one argument was expected", relname);
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args = trigger->tgargs;
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tupdesc = rel->rd_att;
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attnum = SPI_fnumber(tupdesc, args[0]);
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if (attnum < 0)
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ereport(ERROR,
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(errcode(ERRCODE_TRIGGERED_ACTION_EXCEPTION),
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errmsg("\"%s\" has no attribute \"%s\"", relname, args[0])));
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if (SPI_gettypeid(tupdesc, attnum) != TEXTOID)
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ereport(ERROR,
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(errcode(ERRCODE_TRIGGERED_ACTION_EXCEPTION),
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errmsg("attribute \"%s\" of \"%s\" must be type TEXT",
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args[0], relname)));
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/* create fields containing name */
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newval = CStringGetTextDatum(GetUserNameFromId(GetUserId(), false));
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/* construct new tuple */
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rettuple = SPI_modifytuple(rel, rettuple, 1, &attnum, &newval, NULL);
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if (rettuple == NULL)
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/* internal error */
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elog(ERROR, "insert_username (\"%s\"): %d returned by SPI_modifytuple",
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relname, SPI_result);
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pfree(relname);
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return PointerGetDatum(rettuple);
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}
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