*
* 1999 Jan Wieck
*
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/ri_triggers.c,v 1.4 1999/12/06 18:02:44 wieck Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/ri_triggers.c,v 1.5 1999/12/06 19:50:49 wieck Exp $
*
* ----------
*/
#define RI_PLAN_CASCADE_UPD_DOUPDATE 1
#define RI_PLAN_RESTRICT_DEL_CHECKREF 1
#define RI_PLAN_RESTRICT_UPD_CHECKREF 1
+#define RI_PLAN_SETNULL_DEL_DOUPDATE 1
+#define RI_PLAN_SETNULL_UPD_DOUPDATE 1
/* ----------
* Gereral rules 2) a):
* If Rf and Rt are empty (no columns to compare given)
* constraint is true if 0 < (SELECT COUNT(*) FROM T)
+ *
+ * Note: The special case that no columns are given cannot
+ * occur up to now in Postgres, it's just there for
+ * future enhancements.
* ----------
*/
if (tgnargs == 4) {
heap_close(fk_rel, NoLock);
if (SPI_connect() != SPI_OK_CONNECT)
- elog(NOTICE, "SPI_connect() failed in RI_FKey_check()");
+ elog(NOTICE, "SPI_connect() failed in RI_FKey_cascade_del()");
/* ----------
* Fetch or prepare a saved plan for the cascaded delete
/* ----------
* Get the relation descriptors of the FK and PK tables and
- * the old tuple.
+ * the new and old tuple.
* ----------
*/
fk_rel = heap_openr(tgargs[RI_FK_RELNAME_ARGNO], NoLock);
return NULL;
if (SPI_connect() != SPI_OK_CONNECT)
- elog(NOTICE, "SPI_connect() failed in RI_FKey_restrict_upd()");
+ elog(NOTICE, "SPI_connect() failed in RI_FKey_cascade_upd()");
/* ----------
- * Fetch or prepare a saved plan for the restrict delete
- * lookup for foreign references
+ * Fetch or prepare a saved plan for the cascaded update
+ * of foreign references
* ----------
*/
if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
return NULL;
/* ----------
- * Handle MATCH PARTIAL restrict update.
+ * Handle MATCH PARTIAL cascade update.
* ----------
*/
case RI_MATCH_TYPE_PARTIAL:
* Never reached
* ----------
*/
- elog(ERROR, "internal error #4 in ri_triggers.c");
+ elog(ERROR, "internal error #3 in ri_triggers.c");
return NULL;
}
/* ----------
* Fetch or prepare a saved plan for the restrict delete
- * lookup for foreign references
+ * lookup if foreign references exist
* ----------
*/
if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
* Never reached
* ----------
*/
- elog(ERROR, "internal error #3 in ri_triggers.c");
+ elog(ERROR, "internal error #4 in ri_triggers.c");
return NULL;
}
/* ----------
* Get the relation descriptors of the FK and PK tables and
- * the old tuple.
+ * the new and old tuple.
* ----------
*/
fk_rel = heap_openr(tgargs[RI_FK_RELNAME_ARGNO], NoLock);
elog(NOTICE, "SPI_connect() failed in RI_FKey_restrict_upd()");
/* ----------
- * Fetch or prepare a saved plan for the restrict delete
- * lookup for foreign references
+ * Fetch or prepare a saved plan for the restrict update
+ * lookup if foreign references exist
* ----------
*/
if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
* Never reached
* ----------
*/
- elog(ERROR, "internal error #4 in ri_triggers.c");
+ elog(ERROR, "internal error #5 in ri_triggers.c");
return NULL;
}
HeapTuple
RI_FKey_setnull_del (FmgrInfo *proinfo)
{
- TriggerData *trigdata;
+ TriggerData *trigdata;
+ int tgnargs;
+ char **tgargs;
+ Relation fk_rel;
+ Relation pk_rel;
+ HeapTuple old_row;
+ RI_QueryKey qkey;
+ void *qplan;
+ Datum upd_values[RI_MAX_NUMKEYS];
+ char upd_nulls[RI_MAX_NUMKEYS + 1];
+ bool isnull;
+ int i;
trigdata = CurrentTriggerData;
CurrentTriggerData = NULL;
- elog(ERROR, "RI_FKey_setnull_del() called\n");
+ /* ----------
+ * Check that this is a valid trigger call on the right time and event.
+ * ----------
+ */
+ if (trigdata == NULL)
+ elog(ERROR, "RI_FKey_setnull_del() not fired by trigger manager");
+ if (!TRIGGER_FIRED_AFTER(trigdata->tg_event) ||
+ !TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
+ elog(ERROR, "RI_FKey_setnull_del() must be fired AFTER ROW");
+ if (!TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
+ elog(ERROR, "RI_FKey_setnull_del() must be fired for DELETE");
+
+ /* ----------
+ * Check for the correct # of call arguments
+ * ----------
+ */
+ tgnargs = trigdata->tg_trigger->tgnargs;
+ tgargs = trigdata->tg_trigger->tgargs;
+ if (tgnargs < 4 || (tgnargs % 2) != 0)
+ elog(ERROR, "wrong # of arguments in call to RI_FKey_setnull_del()");
+ if (tgnargs > RI_MAX_ARGUMENTS)
+ elog(ERROR, "too many keys (%d max) in call to RI_FKey_setnull_del()",
+ RI_MAX_NUMKEYS);
+
+ /* ----------
+ * Nothing to do if no column names to compare given
+ * ----------
+ */
+ if (tgnargs == 4)
+ return NULL;
+
+ /* ----------
+ * Get the relation descriptors of the FK and PK tables and
+ * the old tuple.
+ * ----------
+ */
+ fk_rel = heap_openr(tgargs[RI_FK_RELNAME_ARGNO], NoLock);
+ pk_rel = trigdata->tg_relation;
+ old_row = trigdata->tg_trigtuple;
+
+ switch (ri_DetermineMatchType(tgargs[RI_MATCH_TYPE_ARGNO]))
+ {
+ /* ----------
+ * SQL3 11.9 <referential constraint definition>
+ * Gereral rules 6) a) ii):
+ * MATCH <UNSPECIFIED> or MATCH FULL
+ * ... ON DELETE SET NULL
+ * ----------
+ */
+ case RI_MATCH_TYPE_UNSPECIFIED:
+ case RI_MATCH_TYPE_FULL:
+ ri_BuildQueryKeyFull(&qkey, trigdata->tg_trigger->tgoid,
+ RI_PLAN_SETNULL_DEL_DOUPDATE,
+ fk_rel, pk_rel,
+ tgnargs, tgargs);
+
+ switch (ri_NullCheck(pk_rel, old_row, &qkey, RI_KEYPAIR_PK_IDX))
+ {
+ case RI_KEYS_ALL_NULL:
+ case RI_KEYS_SOME_NULL:
+ /* ----------
+ * No update - MATCH FULL means there cannot be any
+ * reference to old key if it contains NULL
+ * ----------
+ */
+ heap_close(fk_rel, NoLock);
+ return NULL;
+
+ case RI_KEYS_NONE_NULL:
+ /* ----------
+ * Have a full qualified key - continue below
+ * ----------
+ */
+ break;
+ }
+ heap_close(fk_rel, NoLock);
+
+ if (SPI_connect() != SPI_OK_CONNECT)
+ elog(NOTICE, "SPI_connect() failed in RI_FKey_setnull_del()");
+
+ /* ----------
+ * Fetch or prepare a saved plan for the set null delete
+ * operation
+ * ----------
+ */
+ if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
+ {
+ char buf[256];
+ char querystr[8192];
+ char qualstr[8192];
+ char *querysep;
+ char *qualsep;
+ Oid queryoids[RI_MAX_NUMKEYS];
+
+ /* ----------
+ * The query string built is
+ * UPDATE <fktable> SET fkatt1 = NULL [, ...]
+ * WHERE fkatt1 = $1 [AND ...]
+ * The type id's for the $ parameters are those of the
+ * corresponding PK attributes. Thus, SPI_prepare could
+ * eventually fail if the parser cannot identify some way
+ * how to compare these two types by '='.
+ * ----------
+ */
+ sprintf(querystr, "UPDATE \"%s\" SET",
+ tgargs[RI_FK_RELNAME_ARGNO]);
+ qualstr[0] = '\0';
+ querysep = "";
+ qualsep = "WHERE";
+ for (i = 0; i < qkey.nkeypairs; i++)
+ {
+ sprintf(buf, "%s \"%s\" = NULL", querysep,
+ tgargs[4 + i * 2]);
+ strcat(querystr, buf);
+ sprintf(buf, " %s \"%s\" = $%d", qualsep,
+ tgargs[4 + i * 2], i + 1);
+ strcat(qualstr, buf);
+ querysep = ",";
+ qualsep = "AND";
+ queryoids[i] = SPI_gettypeid(pk_rel->rd_att,
+ qkey.keypair[i][RI_KEYPAIR_PK_IDX]);
+ }
+ strcat(querystr, qualstr);
+
+ /* ----------
+ * Prepare, save and remember the new plan.
+ * ----------
+ */
+ qplan = SPI_prepare(querystr, qkey.nkeypairs * 2, queryoids);
+ qplan = SPI_saveplan(qplan);
+ ri_HashPreparedPlan(&qkey, qplan);
+ }
+
+ /* ----------
+ * We have a plan now. Build up the arguments for SPI_execp()
+ * from the key values in the updated PK tuple.
+ * ----------
+ */
+ for (i = 0; i < qkey.nkeypairs; i++)
+ {
+ upd_values[i] = SPI_getbinval(old_row,
+ pk_rel->rd_att,
+ qkey.keypair[i][RI_KEYPAIR_PK_IDX],
+ &isnull);
+ if (isnull)
+ upd_nulls[i] = 'n';
+ else
+ upd_nulls[i] = ' ';
+ }
+ upd_nulls[i] = '\0';
+
+ /* ----------
+ * Now update the existing references
+ * ----------
+ */
+ if (SPI_execp(qplan, upd_values, upd_nulls, 0) != SPI_OK_UPDATE)
+ elog(ERROR, "SPI_execp() failed in RI_FKey_setnull_del()");
+
+ if (SPI_finish() != SPI_OK_FINISH)
+ elog(NOTICE, "SPI_finish() failed in RI_FKey_setnull_del()");
+
+ return NULL;
+
+ /* ----------
+ * Handle MATCH PARTIAL set null delete.
+ * ----------
+ */
+ case RI_MATCH_TYPE_PARTIAL:
+ elog(ERROR, "MATCH PARTIAL not yet supported");
+ return NULL;
+ }
+
+ /* ----------
+ * Never reached
+ * ----------
+ */
+ elog(ERROR, "internal error #6 in ri_triggers.c");
return NULL;
}
HeapTuple
RI_FKey_setnull_upd (FmgrInfo *proinfo)
{
- TriggerData *trigdata;
+ TriggerData *trigdata;
+ int tgnargs;
+ char **tgargs;
+ Relation fk_rel;
+ Relation pk_rel;
+ HeapTuple new_row;
+ HeapTuple old_row;
+ RI_QueryKey qkey;
+ void *qplan;
+ Datum upd_values[RI_MAX_NUMKEYS];
+ char upd_nulls[RI_MAX_NUMKEYS + 1];
+ bool isnull;
+ int i;
trigdata = CurrentTriggerData;
CurrentTriggerData = NULL;
- elog(ERROR, "RI_FKey_setnull_upd() called\n");
+ /* ----------
+ * Check that this is a valid trigger call on the right time and event.
+ * ----------
+ */
+ if (trigdata == NULL)
+ elog(ERROR, "RI_FKey_setnull_upd() not fired by trigger manager");
+ if (!TRIGGER_FIRED_AFTER(trigdata->tg_event) ||
+ !TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
+ elog(ERROR, "RI_FKey_setnull_upd() must be fired AFTER ROW");
+ if (!TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
+ elog(ERROR, "RI_FKey_setnull_upd() must be fired for UPDATE");
+
+ /* ----------
+ * Check for the correct # of call arguments
+ * ----------
+ */
+ tgnargs = trigdata->tg_trigger->tgnargs;
+ tgargs = trigdata->tg_trigger->tgargs;
+ if (tgnargs < 4 || (tgnargs % 2) != 0)
+ elog(ERROR, "wrong # of arguments in call to RI_FKey_setnull_upd()");
+ if (tgnargs > RI_MAX_ARGUMENTS)
+ elog(ERROR, "too many keys (%d max) in call to RI_FKey_setnull_upd()",
+ RI_MAX_NUMKEYS);
+
+ /* ----------
+ * Nothing to do if no column names to compare given
+ * ----------
+ */
+ if (tgnargs == 4)
+ return NULL;
+
+ /* ----------
+ * Get the relation descriptors of the FK and PK tables and
+ * the old tuple.
+ * ----------
+ */
+ fk_rel = heap_openr(tgargs[RI_FK_RELNAME_ARGNO], NoLock);
+ pk_rel = trigdata->tg_relation;
+ new_row = trigdata->tg_newtuple;
+ old_row = trigdata->tg_trigtuple;
+
+ switch (ri_DetermineMatchType(tgargs[RI_MATCH_TYPE_ARGNO]))
+ {
+ /* ----------
+ * SQL3 11.9 <referential constraint definition>
+ * Gereral rules 7) a) ii) 2):
+ * MATCH FULL
+ * ... ON UPDATE SET NULL
+ * ----------
+ */
+ case RI_MATCH_TYPE_UNSPECIFIED:
+ elog(ERROR, "MATCH UNSPECIFIED not yet supported");
+ return NULL;
+
+ case RI_MATCH_TYPE_FULL:
+ ri_BuildQueryKeyFull(&qkey, trigdata->tg_trigger->tgoid,
+ RI_PLAN_SETNULL_UPD_DOUPDATE,
+ fk_rel, pk_rel,
+ tgnargs, tgargs);
+
+ switch (ri_NullCheck(pk_rel, old_row, &qkey, RI_KEYPAIR_PK_IDX))
+ {
+ case RI_KEYS_ALL_NULL:
+ case RI_KEYS_SOME_NULL:
+ /* ----------
+ * No update - MATCH FULL means there cannot be any
+ * reference to old key if it contains NULL
+ * ----------
+ */
+ heap_close(fk_rel, NoLock);
+ return NULL;
+
+ case RI_KEYS_NONE_NULL:
+ /* ----------
+ * Have a full qualified key - continue below
+ * ----------
+ */
+ break;
+ }
+ heap_close(fk_rel, NoLock);
+
+ /* ----------
+ * No need to do anything if old and new keys are equal
+ * ----------
+ */
+ if (ri_KeysEqual(pk_rel, old_row, new_row, &qkey,
+ RI_KEYPAIR_PK_IDX))
+ return NULL;
+
+ if (SPI_connect() != SPI_OK_CONNECT)
+ elog(NOTICE, "SPI_connect() failed in RI_FKey_setnull_upd()");
+
+ /* ----------
+ * Fetch or prepare a saved plan for the set null update
+ * operation
+ * ----------
+ */
+ if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
+ {
+ char buf[256];
+ char querystr[8192];
+ char qualstr[8192];
+ char *querysep;
+ char *qualsep;
+ Oid queryoids[RI_MAX_NUMKEYS];
+
+ /* ----------
+ * The query string built is
+ * UPDATE <fktable> SET fkatt1 = NULL [, ...]
+ * WHERE fkatt1 = $1 [AND ...]
+ * The type id's for the $ parameters are those of the
+ * corresponding PK attributes. Thus, SPI_prepare could
+ * eventually fail if the parser cannot identify some way
+ * how to compare these two types by '='.
+ * ----------
+ */
+ sprintf(querystr, "UPDATE \"%s\" SET",
+ tgargs[RI_FK_RELNAME_ARGNO]);
+ qualstr[0] = '\0';
+ querysep = "";
+ qualsep = "WHERE";
+ for (i = 0; i < qkey.nkeypairs; i++)
+ {
+ sprintf(buf, "%s \"%s\" = NULL", querysep,
+ tgargs[4 + i * 2]);
+ strcat(querystr, buf);
+ sprintf(buf, " %s \"%s\" = $%d", qualsep,
+ tgargs[4 + i * 2], i + 1);
+ strcat(qualstr, buf);
+ querysep = ",";
+ qualsep = "AND";
+ queryoids[i] = SPI_gettypeid(pk_rel->rd_att,
+ qkey.keypair[i][RI_KEYPAIR_PK_IDX]);
+ }
+ strcat(querystr, qualstr);
+
+ /* ----------
+ * Prepare, save and remember the new plan.
+ * ----------
+ */
+ qplan = SPI_prepare(querystr, qkey.nkeypairs * 2, queryoids);
+ qplan = SPI_saveplan(qplan);
+ ri_HashPreparedPlan(&qkey, qplan);
+ }
+
+ /* ----------
+ * We have a plan now. Build up the arguments for SPI_execp()
+ * from the key values in the updated PK tuple.
+ * ----------
+ */
+ for (i = 0; i < qkey.nkeypairs; i++)
+ {
+ upd_values[i] = SPI_getbinval(old_row,
+ pk_rel->rd_att,
+ qkey.keypair[i][RI_KEYPAIR_PK_IDX],
+ &isnull);
+ if (isnull)
+ upd_nulls[i] = 'n';
+ else
+ upd_nulls[i] = ' ';
+ }
+ upd_nulls[i] = '\0';
+
+ /* ----------
+ * Now update the existing references
+ * ----------
+ */
+ if (SPI_execp(qplan, upd_values, upd_nulls, 0) != SPI_OK_UPDATE)
+ elog(ERROR, "SPI_execp() failed in RI_FKey_setnull_upd()");
+
+ if (SPI_finish() != SPI_OK_FINISH)
+ elog(NOTICE, "SPI_finish() failed in RI_FKey_setnull_upd()");
+
+ return NULL;
+
+ /* ----------
+ * Handle MATCH PARTIAL set null update.
+ * ----------
+ */
+ case RI_MATCH_TYPE_PARTIAL:
+ elog(ERROR, "MATCH PARTIAL not yet supported");
+ return NULL;
+ }
+
+ /* ----------
+ * Never reached
+ * ----------
+ */
+ elog(ERROR, "internal error #7 in ri_triggers.c");
return NULL;
}
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