*
* 1999 Jan Wieck
*
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/ri_triggers.c,v 1.12 2000/01/06 20:46:51 wieck Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/ri_triggers.c,v 1.13 2000/02/07 17:50:38 wieck Exp $
*
* ----------
*/
/* ----------
* Internal TODO:
*
- * Add MATCH <unspecified> logic (in places where not
- * equal to MATCH FULL.
- *
* Add MATCH PARTIAL logic.
* ----------
*/
#define RI_PLAN_CHECK_LOOKUPPK 2
#define RI_PLAN_CASCADE_DEL_DODELETE 1
#define RI_PLAN_CASCADE_UPD_DOUPDATE 1
+#define RI_PLAN_NOACTION_DEL_CHECKREF 1
+#define RI_PLAN_NOACTION_UPD_CHECKREF 1
#define RI_PLAN_RESTRICT_DEL_CHECKREF 1
#define RI_PLAN_RESTRICT_UPD_CHECKREF 1
#define RI_PLAN_SETNULL_DEL_DOUPDATE 1
int argc, char **argv);
static bool ri_KeysEqual(Relation rel, HeapTuple oldtup, HeapTuple newtup,
RI_QueryKey *key, int pairidx);
+static bool ri_AllKeysUnequal(Relation rel, HeapTuple oldtup, HeapTuple newtup,
+ RI_QueryKey *key, int pairidx);
+static bool ri_OneKeyEqual(Relation rel, int column, HeapTuple oldtup,
+ HeapTuple newtup, RI_QueryKey *key, int pairidx);
static bool ri_AttributesEqual(Oid typeid, Datum oldvalue, Datum newvalue);
static void ri_InitHashTables(void);
char check_nulls[RI_MAX_NUMKEYS + 1];
bool isnull;
int i;
-
+ int match_type;
trigdata = CurrentTriggerData;
CurrentTriggerData = NULL;
ReferentialIntegritySnapshotOverride = true;
/* ----------
* The query string built is
- * SELECT oid FROM <pktable>
+ *
SELECT oid FROM <pktable>
* ----------
*/
sprintf(querystr, "SELECT oid FROM \"%s\" FOR UPDATE OF \"%s\"",
}
+ match_type = ri_DetermineMatchType(tgargs[RI_MATCH_TYPE_ARGNO]);
+
+ if (match_type == RI_MATCH_TYPE_PARTIAL)
+ {
+ elog(ERROR, "MATCH PARTIAL not yet supported");
+ return NULL;
+ }
+
+ ri_BuildQueryKeyFull(&qkey, trigdata->tg_trigger->tgoid,
+ RI_PLAN_CHECK_LOOKUPPK, fk_rel, pk_rel,
+ tgnargs, tgargs);
+
+ switch (ri_NullCheck(fk_rel, new_row, &qkey, RI_KEYPAIR_FK_IDX))
+ {
+ case RI_KEYS_ALL_NULL:
+ /* ----------
+ * No check - if NULLs are allowed at all is
+ * already checked by NOT NULL constraint.
+ *
+ * This is true for MATCH FULL, MATCH PARTIAL, and
+ * MATCH <unspecified>
+ * ----------
+ */
+ heap_close(pk_rel, NoLock);
+ return NULL;
+
+ case RI_KEYS_SOME_NULL:
+ /* ----------
+ * This is the only case that differs between the
+ * three kinds of MATCH.
+ * ----------
+ */
+ switch (match_type)
+ {
+ case RI_MATCH_TYPE_FULL:
+ /* ----------
+ * Not allowed - MATCH FULL says either all or none
+ * of the attributes can be NULLs
+ * ----------
+ */
+ elog(ERROR, "%s referential integrity violation - "
+ "MATCH FULL doesn't allow mixing of NULL "
+ "and NON-NULL key values",
+ tgargs[RI_CONSTRAINT_NAME_ARGNO]);
+ heap_close(pk_rel, NoLock);
+ return NULL;
+
+ case RI_MATCH_TYPE_UNSPECIFIED:
+ /* ----------
+ * MATCH <unspecified> - if ANY column is null, we
+ * have a match.
+ * ----------
+ */
+ heap_close(pk_rel, NoLock);
+ return NULL;
+
+ case RI_MATCH_TYPE_PARTIAL:
+ /* ----------
+ * MATCH PARTIAL - all non-null columns must match.
+ * (not implemented, can be done by modifying the query
+ * below to only include non-null columns, or by
+ * writing a special version here)
+ * ----------
+ */
+ elog(ERROR, "MATCH PARTIAL not yet implemented");
+ heap_close(pk_rel, NoLock);
+ return NULL;
+ }
+
+ case RI_KEYS_NONE_NULL:
+ /* ----------
+ * Have a full qualified key - continue below for all three
+ * kinds of MATCH.
+ * ----------
+ */
+ break;
+ }
+ heap_close(pk_rel, NoLock);
+
+ /* ----------
+ * Note:
+ * We cannot avoid the check on UPDATE, even if old and new
+ * key are the same. Otherwise, someone could DELETE the PK
+ * that consists of the DEFAULT values, and if there are any
+ * references, a ON DELETE SET DEFAULT action would update
+ * the references to exactly these values but we wouldn't see
+ * that weired case (this is the only place to see it).
+ * ----------
+ */
+ if (SPI_connect() != SPI_OK_CONNECT)
+ elog(NOTICE, "SPI_connect() failed in RI_FKey_check()");
+
+ /* ----------
+ * Fetch or prepare a saved plan for the real check
+ * ----------
+ */
+ if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
+ {
+ char buf[256];
+ char querystr[8192];
+ char *querysep;
+ Oid queryoids[RI_MAX_NUMKEYS];
+
+ /* ----------
+ * The query string built is
+ * SELECT oid FROM <pktable> WHERE pkatt1 = $1 [AND ...]
+ * The type id's for the $ parameters are those of the
+ * corresponding FK attributes. Thus, SPI_prepare could
+ * eventually fail if the parser cannot identify some way
+ * how to compare these two types by '='.
+ * ----------
+ */
+ sprintf(querystr, "SELECT oid FROM \"%s\"",
+ tgargs[RI_PK_RELNAME_ARGNO]);
+ querysep = "WHERE";
+ for (i = 0; i < qkey.nkeypairs; i++)
+ {
+ sprintf(buf, " %s \"%s\" = $%d", querysep,
+ tgargs[5 + i * 2], i + 1);
+ strcat(querystr, buf);
+ querysep = "AND";
+ queryoids[i] = SPI_gettypeid(fk_rel->rd_att,
+ qkey.keypair[i][RI_KEYPAIR_FK_IDX]);
+ }
+ sprintf(buf, " FOR UPDATE OF \"%s\"",
+ tgargs[RI_PK_RELNAME_ARGNO]);
+ strcat(querystr, buf);
+
+ /* ----------
+ * Prepare, save and remember the new plan.
+ * ----------
+ */
+ qplan = SPI_prepare(querystr, qkey.nkeypairs, 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 new FK tuple.
+ * ----------
+ */
+ for (i = 0; i < qkey.nkeypairs; i++)
+ {
+ /* ----------
+ * We can implement MATCH PARTIAL by excluding this column from
+ * the query if it is null. Simple! Unfortunately, the
+ * referential actions aren't so I've not bothered to do so
+ * for the moment.
+ * ----------
+ */
+
+ check_values[i] = SPI_getbinval(new_row,
+ fk_rel->rd_att,
+ qkey.keypair[i][RI_KEYPAIR_FK_IDX],
+ &isnull);
+ if (isnull)
+ check_nulls[i] = 'n';
+ else
+ check_nulls[i] = ' ';
+ }
+ check_nulls[i] = '\0';
+
+ /* ----------
+ * Now check that foreign key exists in PK table
+ * ----------
+ */
+ if (SPI_execp(qplan, check_values, check_nulls, 1) != SPI_OK_SELECT)
+ elog(ERROR, "SPI_execp() failed in RI_FKey_check()");
+
+ if (SPI_processed == 0)
+ elog(ERROR, "%s referential integrity violation - "
+ "key referenced from %s not found in %s",
+ tgargs[RI_CONSTRAINT_NAME_ARGNO],
+ tgargs[RI_FK_RELNAME_ARGNO],
+ tgargs[RI_PK_RELNAME_ARGNO]);
+
+ if (SPI_finish() != SPI_OK_FINISH)
+ elog(NOTICE, "SPI_finish() failed in RI_FKey_check()");
+
+ return NULL;
+
+ /* ----------
+ * Never reached
+ * ----------
+ */
+ elog(ERROR, "internal error #1 in ri_triggers.c");
+ return NULL;
+}
+
+
+/* ----------
+ * RI_FKey_check_ins -
+ *
+ * Check foreign key existance at insert event on FK table.
+ * ----------
+ */
+HeapTuple
+RI_FKey_check_ins (FmgrInfo *proinfo)
+{
+ return RI_FKey_check(proinfo);
+}
+
+
+/* ----------
+ * RI_FKey_check_upd -
+ *
+ * Check foreign key existance at update event on FK table.
+ * ----------
+ */
+HeapTuple
+RI_FKey_check_upd (FmgrInfo *proinfo)
+{
+ return RI_FKey_check(proinfo);
+}
+
+
+/* ----------
+ * RI_FKey_noaction_del -
+ *
+ * Give an error and roll back the current transaction if the
+ * delete has resulted in a violation of the given referential
+ * integrity constraint.
+ * ----------
+ */
+HeapTuple
+RI_FKey_noaction_del (FmgrInfo *proinfo)
+{
+ TriggerData *trigdata;
+ int tgnargs;
+ char **tgargs;
+ Relation fk_rel;
+ Relation pk_rel;
+ HeapTuple old_row;
+ RI_QueryKey qkey;
+ void *qplan;
+ Datum del_values[RI_MAX_NUMKEYS];
+ char del_nulls[RI_MAX_NUMKEYS + 1];
+ bool isnull;
+ int i;
+
+ trigdata = CurrentTriggerData;
+ CurrentTriggerData = NULL;
+ ReferentialIntegritySnapshotOverride = true;
+
+ /* ----------
+ * Check that this is a valid trigger call on the right time and event.
+ * ----------
+ */
+ if (trigdata == NULL)
+ elog(ERROR, "RI_FKey_noaction_del() not fired by trigger manager");
+ if (!TRIGGER_FIRED_AFTER(trigdata->tg_event) ||
+ !TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
+ elog(ERROR, "RI_FKey_noaction_del() must be fired AFTER ROW");
+ if (!TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
+ elog(ERROR, "RI_FKey_noaction_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_noaction_del()");
+ if (tgnargs > RI_MAX_ARGUMENTS)
+ elog(ERROR, "too many keys (%d max) in call to RI_FKey_noaction_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 2) b):
- * <match type> is not specified
+ * Gereral rules 6) a) iv):
+ * MATCH <unspecified> or MATCH FULL
+ * ... ON DELETE CASCADE
* ----------
*/
case RI_MATCH_TYPE_UNSPECIFIED:
- elog(ERROR, "MATCH <unspecified> not yet supported");
+ case RI_MATCH_TYPE_FULL:
+ ri_BuildQueryKeyFull(&qkey, trigdata->tg_trigger->tgoid,
+ RI_PLAN_NOACTION_DEL_CHECKREF,
+ 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 check - 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_noaction_del()");
+
+ /* ----------
+ * Fetch or prepare a saved plan for the restrict delete
+ * lookup if foreign references exist
+ * ----------
+ */
+ if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
+ {
+ char buf[256];
+ char querystr[8192];
+ char *querysep;
+ Oid queryoids[RI_MAX_NUMKEYS];
+
+ /* ----------
+ * The query string built is
+ * SELECT oid FROM <fktable> 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, "SELECT oid FROM \"%s\"",
+ tgargs[RI_FK_RELNAME_ARGNO]);
+ querysep = "WHERE";
+ for (i = 0; i < qkey.nkeypairs; i++)
+ {
+ sprintf(buf, " %s \"%s\" = $%d", querysep,
+ tgargs[4 + i * 2], i + 1);
+ strcat(querystr, buf);
+ querysep = "AND";
+ queryoids[i] = SPI_gettypeid(pk_rel->rd_att,
+ qkey.keypair[i][RI_KEYPAIR_PK_IDX]);
+ }
+ sprintf(buf, " FOR UPDATE OF \"%s\"",
+ tgargs[RI_FK_RELNAME_ARGNO]);
+ strcat(querystr, buf);
+
+ /* ----------
+ * Prepare, save and remember the new plan.
+ * ----------
+ */
+ qplan = SPI_prepare(querystr, qkey.nkeypairs, 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 deleted PK tuple.
+ * ----------
+ */
+ for (i = 0; i < qkey.nkeypairs; i++)
+ {
+ del_values[i] = SPI_getbinval(old_row,
+ pk_rel->rd_att,
+ qkey.keypair[i][RI_KEYPAIR_PK_IDX],
+ &isnull);
+ if (isnull)
+ del_nulls[i] = 'n';
+ else
+ del_nulls[i] = ' ';
+ }
+ del_nulls[i] = '\0';
+
+ /* ----------
+ * Now check for existing references
+ * ----------
+ */
+ if (SPI_execp(qplan, del_values, del_nulls, 1) != SPI_OK_SELECT)
+ elog(ERROR, "SPI_execp() failed in RI_FKey_noaction_del()");
+
+ if (SPI_processed > 0)
+ elog(ERROR, "%s referential integrity violation - "
+ "key in %s still referenced from %s",
+ tgargs[RI_CONSTRAINT_NAME_ARGNO],
+ tgargs[RI_PK_RELNAME_ARGNO],
+ tgargs[RI_FK_RELNAME_ARGNO]);
+
+ if (SPI_finish() != SPI_OK_FINISH)
+ elog(NOTICE, "SPI_finish() failed in RI_FKey_noaction_del()");
+
return NULL;
/* ----------
- * SQL3 11.9 <referential constraint definition>
- * Gereral rules 2) c):
- * MATCH PARTIAL
+ * Handle MATCH PARTIAL restrict delete.
* ----------
*/
case RI_MATCH_TYPE_PARTIAL:
elog(ERROR, "MATCH PARTIAL not yet supported");
return NULL;
+ }
+
+ /* ----------
+ * Never reached
+ * ----------
+ */
+ elog(ERROR, "internal error #2 in ri_triggers.c");
+ return NULL;
+}
+
+
+/* ----------
+ * RI_FKey_noaction_upd -
+ *
+ * Give an error and roll back the current transaction if the
+ * update has resulted in a violation of the given referential
+ * integrity constraint.
+ * ----------
+ */
+HeapTuple
+RI_FKey_noaction_upd (FmgrInfo *proinfo)
+{
+ 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;
+ ReferentialIntegritySnapshotOverride = true;
+
+ /* ----------
+ * Check that this is a valid trigger call on the right time and event.
+ * ----------
+ */
+ if (trigdata == NULL)
+ elog(ERROR, "RI_FKey_noaction_upd() not fired by trigger manager");
+ if (!TRIGGER_FIRED_AFTER(trigdata->tg_event) ||
+ !TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
+ elog(ERROR, "RI_FKey_noaction_upd() must be fired AFTER ROW");
+ if (!TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
+ elog(ERROR, "RI_FKey_noaction_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_noaction_upd()");
+ if (tgnargs > RI_MAX_ARGUMENTS)
+ elog(ERROR, "too many keys (%d max) in call to RI_FKey_noaction_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 new and 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 2) d):
- * MATCH FULL
+ * Gereral rules 6) a) iv):
+ * MATCH <unspecified> or MATCH FULL
+ * ... ON DELETE CASCADE
* ----------
*/
+ case RI_MATCH_TYPE_UNSPECIFIED:
case RI_MATCH_TYPE_FULL:
ri_BuildQueryKeyFull(&qkey, trigdata->tg_trigger->tgoid,
- RI_PLAN_CHECK_LOOKUPPK,
- fk_rel, pk_rel,
- tgnargs, tgargs);
+ RI_PLAN_NOACTION_UPD_CHECKREF,
+ fk_rel, pk_rel,
+ tgnargs, tgargs);
- switch (ri_NullCheck(fk_rel, new_row, &qkey, RI_KEYPAIR_FK_IDX))
+ switch (ri_NullCheck(pk_rel, old_row, &qkey, RI_KEYPAIR_PK_IDX))
{
case RI_KEYS_ALL_NULL:
+ case RI_KEYS_SOME_NULL:
/* ----------
- * No check - if NULLs are allowed at all is
- * already checked by NOT NULL constraint.
+ * No check - MATCH FULL means there cannot be any
+ * reference to old key if it contains NULL
* ----------
*/
- heap_close(pk_rel, NoLock);
+ heap_close(fk_rel, NoLock);
return NULL;
- case RI_KEYS_SOME_NULL:
- /* ----------
- * Not allowed - MATCH FULL says either all or none
- * of the attributes can be NULLs
- * ----------
- */
- elog(ERROR, "%s referential integrity violation - "
- "MATCH FULL doesn't allow mixing of NULL "
- "and NON-NULL key values",
- tgargs[RI_CONSTRAINT_NAME_ARGNO]);
- break;
-
case RI_KEYS_NONE_NULL:
/* ----------
* Have a full qualified key - continue below
*/
break;
}
- heap_close(pk_rel, NoLock);
+ heap_close(fk_rel, NoLock);
/* ----------
- * Note:
- * We cannot avoid the check on UPDATE, even if old and new
- * key are the same. Otherwise, someone could DELETE the PK
- * that consists of the DEFAULT values, and if there are any
- * references, a ON DELETE SET DEFAULT action would update
- * the references to exactly these values but we wouldn't see
- * that weired case (this is the only place to see it).
+ * No need to check 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_check()");
+ elog(NOTICE, "SPI_connect() failed in RI_FKey_noaction_upd()");
/* ----------
- * Fetch or prepare a saved plan for the real check
+ * Fetch or prepare a saved plan for the noaction update
+ * lookup if foreign references exist
* ----------
*/
if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
/* ----------
* The query string built is
- * SELECT oid FROM <pktable> WHERE pkatt1 = $1 [AND ...]
+ * SELECT oid FROM <fktable> WHERE fkatt1 = $1 [AND ...]
* The type id's for the $ parameters are those of the
- * corresponding FK attributes. Thus, SPI_prepare could
+ * 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, "SELECT oid FROM \"%s\"",
- tgargs[RI_PK_RELNAME_ARGNO]);
+ tgargs[RI_FK_RELNAME_ARGNO]);
querysep = "WHERE";
for (i = 0; i < qkey.nkeypairs; i++)
{
sprintf(buf, " %s \"%s\" = $%d", querysep,
- tgargs[5 + i * 2], i + 1);
+ tgargs[4 + i * 2], i + 1);
strcat(querystr, buf);
querysep = "AND";
- queryoids[i] = SPI_gettypeid(fk_rel->rd_att,
- qkey.keypair[i][RI_KEYPAIR_FK_IDX]);
+ queryoids[i] = SPI_gettypeid(pk_rel->rd_att,
+ qkey.keypair[i][RI_KEYPAIR_PK_IDX]);
}
- sprintf(buf, " FOR UPDATE OF \"%s\"",
- tgargs[RI_PK_RELNAME_ARGNO]);
+ sprintf(buf, " FOR UPDATE OF \"%s\"",
+ tgargs[RI_FK_RELNAME_ARGNO]);
strcat(querystr, buf);
/* ----------
/* ----------
* We have a plan now. Build up the arguments for SPI_execp()
- * from the key values in the new FK tuple.
+ * from the key values in the updated PK tuple.
* ----------
*/
for (i = 0; i < qkey.nkeypairs; i++)
{
- check_values[i] = SPI_getbinval(new_row,
- fk_rel->rd_att,
- qkey.keypair[i][RI_KEYPAIR_FK_IDX],
+ upd_values[i] = SPI_getbinval(old_row,
+ pk_rel->rd_att,
+ qkey.keypair[i][RI_KEYPAIR_PK_IDX],
&isnull);
if (isnull)
- check_nulls[i] = 'n';
+ upd_nulls[i] = 'n';
else
- check_nulls[i] = ' ';
+ upd_nulls[i] = ' ';
}
- check_nulls[i] = '\0';
+ upd_nulls[i] = '\0';
/* ----------
- * Now check that foreign key exists in PK table
+ * Now check for existing references
* ----------
*/
- if (SPI_execp(qplan, check_values, check_nulls, 1) != SPI_OK_SELECT)
- elog(ERROR, "SPI_execp() failed in RI_FKey_check()");
+ if (SPI_execp(qplan, upd_values, upd_nulls, 1) != SPI_OK_SELECT)
+ elog(ERROR, "SPI_execp() failed in RI_FKey_noaction_upd()");
- if (SPI_processed == 0)
+ if (SPI_processed > 0)
elog(ERROR, "%s referential integrity violation - "
- "key referenced from %s not found in %s",
+ "key in %s still referenced from %s",
tgargs[RI_CONSTRAINT_NAME_ARGNO],
- tgargs[RI_FK_RELNAME_ARGNO],
- tgargs[RI_PK_RELNAME_ARGNO]);
+ tgargs[RI_PK_RELNAME_ARGNO],
+ tgargs[RI_FK_RELNAME_ARGNO]);
if (SPI_finish() != SPI_OK_FINISH)
- elog(NOTICE, "SPI_finish() failed in RI_FKey_check()");
+ elog(NOTICE, "SPI_finish() failed in RI_FKey_noaction_upd()");
+
+ return NULL;
+ /* ----------
+ * Handle MATCH PARTIAL noaction update.
+ * ----------
+ */
+ case RI_MATCH_TYPE_PARTIAL:
+ elog(ERROR, "MATCH PARTIAL not yet supported");
return NULL;
}
* Never reached
* ----------
*/
- elog(ERROR, "internal error #1 in ri_triggers.c");
- return NULL;
-}
-
-
-/* ----------
- * RI_FKey_check_ins -
- *
- * Check foreign key existance at insert event on FK table.
- * ----------
- */
-HeapTuple
-RI_FKey_check_ins (FmgrInfo *proinfo)
-{
- return RI_FKey_check(proinfo);
-}
-
-
-/* ----------
- * RI_FKey_check_upd -
- *
- * Check foreign key existance at update event on FK table.
- * ----------
- */
-HeapTuple
-RI_FKey_check_upd (FmgrInfo *proinfo)
-{
- return RI_FKey_check(proinfo);
-}
-
-
-/* ----------
- * RI_FKey_noaction_del -
- *
- * This is here only to let the trigger manager trace for
- * "triggered data change violation"
- * ----------
- */
-HeapTuple
-RI_FKey_noaction_del (FmgrInfo *proinfo)
-{
- return NULL;
-}
-
-
-/* ----------
- * RI_FKey_noaction_upd -
- *
- * This is here only to let the trigger manager trace for
- * "triggered data change violation"
- * ----------
- */
-HeapTuple
-RI_FKey_noaction_upd (FmgrInfo *proinfo)
-{
+ elog(ERROR, "internal error #3 in ri_triggers.c");
return NULL;
}
/* ----------
* The query string built is
- * DELETE FROM <fktable> WHERE fkatt1 = $1 [AND ...]
+ * DELETE FROM <fktable> 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
* Never reached
* ----------
*/
- elog(ERROR, "internal error #2 in ri_triggers.c");
+ elog(ERROR, "internal error #4 in ri_triggers.c");
return NULL;
}
/* ----------
* The query string built is
- * UPDATE <fktable> SET fkatt1 = $1 [, ...]
+ * UPDATE <fktable> SET fkatt1 = $1 [, ...]
* WHERE fkatt1 = $n [AND ...]
* The type id's for the $ parameters are those of the
* corresponding PK attributes. Thus, SPI_prepare could
* Never reached
* ----------
*/
- elog(ERROR, "internal error #3 in ri_triggers.c");
+ elog(ERROR, "internal error #5 in ri_triggers.c");
return NULL;
}
* RI_FKey_restrict_del -
*
* Restrict delete from PK table to rows unreferenced by foreign key.
+ *
+ * SQL3 intends that this referential action occur BEFORE the
+ * update is performed, rather than after. This appears to be
+ * the only difference between "NO ACTION" and "RESTRICT".
+ *
+ * For now, however, we treat "RESTRICT" and "NO ACTION" as
+ * equivalent.
* ----------
*/
HeapTuple
/* ----------
* The query string built is
- * SELECT oid FROM <fktable> WHERE fkatt1 = $1 [AND ...]
+ * SELECT oid FROM <fktable> 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
* Never reached
* ----------
*/
- elog(ERROR, "internal error #4 in ri_triggers.c");
+ elog(ERROR, "internal error #6 in ri_triggers.c");
return NULL;
}
* RI_FKey_restrict_upd -
*
* Restrict update of PK to rows unreferenced by foreign key.
+ *
+ * SQL3 intends that this referential action occur BEFORE the
+ * update is performed, rather than after. This appears to be
+ * the only difference between "NO ACTION" and "RESTRICT".
+ *
+ * For now, however, we treat "RESTRICT" and "NO ACTION" as
+ * equivalent.
* ----------
*/
HeapTuple
/* ----------
* The query string built is
- * SELECT oid FROM <fktable> WHERE fkatt1 = $1 [AND ...]
+ * SELECT oid FROM <fktable> 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
* Never reached
* ----------
*/
- elog(ERROR, "internal error #5 in ri_triggers.c");
+ elog(ERROR, "internal error #7 in ri_triggers.c");
return NULL;
}
/* ----------
* The query string built is
- * UPDATE <fktable> SET fkatt1 = NULL [, ...]
+ * 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
* Never reached
* ----------
*/
- elog(ERROR, "internal error #6 in ri_triggers.c");
+ elog(ERROR, "internal error #8 in ri_triggers.c");
return NULL;
}
char upd_nulls[RI_MAX_NUMKEYS + 1];
bool isnull;
int i;
+ int match_type;
+ bool use_cached_query;
trigdata = CurrentTriggerData;
CurrentTriggerData = NULL;
pk_rel = trigdata->tg_relation;
new_row = trigdata->tg_newtuple;
old_row = trigdata->tg_trigtuple;
+ match_type = ri_DetermineMatchType(tgargs[RI_MATCH_TYPE_ARGNO]);
- switch (ri_DetermineMatchType(tgargs[RI_MATCH_TYPE_ARGNO]))
+ switch (match_type)
{
/* ----------
* SQL3 11.9 <referential constraint definition>
* ----------
*/
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,
}
heap_close(fk_rel, NoLock);
+
/* ----------
* No need to do anything if old and new keys are equal
* ----------
if (SPI_connect() != SPI_OK_CONNECT)
elog(NOTICE, "SPI_connect() failed in RI_FKey_setnull_upd()");
+ /* "MATCH <unspecified>" only changes columns corresponding to
+ * the referenced columns that have changed in pk_rel. This means
+ * the "SET attrn=NULL [, attrn=NULL]" string will be change as
+ * well. In this case, we need to build a temporary plan
+ * rather than use our cached plan, unless the update happens
+ * to change all columns in the key. Fortunately, for the most
+ * common case of a single-column foreign key, this will be
+ * true.
+ *
+ * In case you're wondering, the inequality check works because
+ * we know that the old key value has no NULLs (see above).
+ */
+
+ use_cached_query = match_type == RI_MATCH_TYPE_FULL ||
+ ri_AllKeysUnequal(pk_rel, old_row, new_row,
+ &qkey, RI_KEYPAIR_PK_IDX);
+
/* ----------
* Fetch or prepare a saved plan for the set null update
- * operation
+ * operation if possible, or build a temporary plan if not.
* ----------
*/
- if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
+ if (!use_cached_query ||
+ (qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
{
char buf[256];
char querystr[8192];
/* ----------
* The query string built is
- * UPDATE <fktable> SET fkatt1 = NULL [, ...]
+ * 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
qualsep = "WHERE";
for (i = 0; i < qkey.nkeypairs; i++)
{
- sprintf(buf, "%s \"%s\" = NULL", querysep,
+ /* MATCH <unspecified> - only change columns corresponding
+ * to changed columns in pk_rel's key
+ */
+ if (match_type == RI_MATCH_TYPE_FULL ||
+ !ri_OneKeyEqual(pk_rel, i, old_row, new_row, &qkey,
+ RI_KEYPAIR_PK_IDX))
+ {
+ sprintf(buf, "%s \"%s\" = NULL", querysep,
tgargs[4 + i * 2]);
- strcat(querystr, buf);
+ strcat(querystr, buf);
+ querysep = ",";
+ }
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.
+ * Prepare the new plan.
* ----------
*/
qplan = SPI_prepare(querystr, qkey.nkeypairs, queryoids);
- qplan = SPI_saveplan(qplan);
- ri_HashPreparedPlan(&qkey, qplan);
+
+ /* Save and remember the plan if we're building the "standard"
+ * plan.
+ */
+ if (use_cached_query)
+ {
+ qplan = SPI_saveplan(qplan);
+ ri_HashPreparedPlan(&qkey, qplan);
+ }
}
/* ----------
* Never reached
* ----------
*/
- elog(ERROR, "internal error #7 in ri_triggers.c");
+ elog(ERROR, "internal error #9 in ri_triggers.c");
return NULL;
}
/* ----------
* The query string built is
- * UPDATE <fktable> SET fkatt1 = NULL [, ...]
+ * 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
* Never reached
* ----------
*/
- elog(ERROR, "internal error #8 in ri_triggers.c");
+ elog(ERROR, "internal error #10 in ri_triggers.c");
return NULL;
}
char upd_nulls[RI_MAX_NUMKEYS + 1];
bool isnull;
int i;
+ int match_type;
trigdata = CurrentTriggerData;
CurrentTriggerData = NULL;
new_row = trigdata->tg_newtuple;
old_row = trigdata->tg_trigtuple;
- switch (ri_DetermineMatchType(tgargs[RI_MATCH_TYPE_ARGNO]))
+ match_type = ri_DetermineMatchType(tgargs[RI_MATCH_TYPE_ARGNO]);
+
+ switch (match_type)
{
/* ----------
* SQL3 11.9 <referential constraint definition>
/* ----------
* The query string built is
- * UPDATE <fktable> SET fkatt1 = NULL [, ...]
+ * 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
qualsep = "WHERE";
for (i = 0; i < qkey.nkeypairs; i++)
{
- sprintf(buf, "%s \"%s\" = NULL", querysep,
+ /* MATCH <unspecified> - only change columns corresponding
+ * to changed columns in pk_rel's key
+ */
+ if (match_type == RI_MATCH_TYPE_FULL ||
+ !ri_OneKeyEqual(pk_rel, i, old_row,
+ new_row, &qkey, RI_KEYPAIR_PK_IDX))
+ {
+ sprintf(buf, "%s \"%s\" = NULL", querysep,
tgargs[4 + i * 2]);
- strcat(querystr, buf);
+ strcat(querystr, buf);
+ querysep = ",";
+ }
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]);
defval = NULL;
for (i = 0; i < qkey.nkeypairs && defval != NULL; i++)
{
- /* ----------
- * For each key attribute lookup the tuple constructor
- * for a corresponding default value
- * ----------
+ /* MATCH <unspecified> - only change columns corresponding
+ * to changed columns in pk_rel's key. This conditional
+ * must match the one in the loop above that built the
+ * SET attrn=NULL list.
*/
- for (j = 0; j < fk_rel->rd_att->constr->num_defval; j++)
+ if (match_type == RI_MATCH_TYPE_FULL ||
+ !ri_OneKeyEqual(pk_rel, i, old_row,
+ new_row, &qkey, RI_KEYPAIR_PK_IDX))
{
- if (defval[j].adnum ==
- qkey.keypair[i][RI_KEYPAIR_FK_IDX])
+ /* ----------
+ * For each key attribute lookup the tuple constructor
+ * for a corresponding default value
+ * ----------
+ */
+ for (j = 0; j < fk_rel->rd_att->constr->num_defval; j++)
{
- /* ----------
- * That's the one - push the expression
- * from defval.adbin into the plan's targetlist
- * ----------
- */
- spi_qptle = (TargetEntry *)
+ if (defval[j].adnum ==
+ qkey.keypair[i][RI_KEYPAIR_FK_IDX])
+ {
+ /* ----------
+ * That's the one - push the expression
+ * from defval.adbin into the plan's targetlist
+ * ----------
+ */
+ spi_qptle = (TargetEntry *)
nth(defval[j].adnum - 1,
spi_plan->targetlist);
- spi_qptle->expr = stringToNode(defval[j].adbin);
+ spi_qptle->expr = stringToNode(defval[j].adbin);
- break;
+ break;
+ }
}
}
}
* Never reached
* ----------
*/
- elog(ERROR, "internal error #9 in ri_triggers.c");
+ elog(ERROR, "internal error #11 in ri_triggers.c");
return NULL;
}
* ----------
*/
case RI_MATCH_TYPE_UNSPECIFIED:
- elog(ERROR, "MATCH <unspecified> not implemented yet");
- break;
-
case RI_MATCH_TYPE_FULL:
ri_BuildQueryKeyFull(&qkey, trigdata->tg_trigger->tgoid,
0,
* Never reached
* ----------
*/
- elog(ERROR, "internal error #9 in ri_triggers.c");
+ elog(ERROR, "internal error #12 in ri_triggers.c");
return false;
}
/* ----------
+ * ri_AllKeysUnequal -
+ *
+ * Check if all key values in OLD and NEW are not equal.
+ * ----------
+ */
+static bool
+ri_AllKeysUnequal(Relation rel, HeapTuple oldtup, HeapTuple newtup,
+ RI_QueryKey *key, int pairidx)
+{
+ int i;
+ Oid typeid;
+ Datum oldvalue;
+ Datum newvalue;
+ bool isnull;
+ bool keys_unequal;
+
+ keys_unequal = true;
+ for (i = 0; keys_unequal && i < key->nkeypairs; i++)
+ {
+ /* ----------
+ * Get one attributes oldvalue. If it is NULL - they're not equal.
+ * ----------
+ */
+ oldvalue = SPI_getbinval(oldtup, rel->rd_att,
+ key->keypair[i][pairidx], &isnull);
+ if (isnull)
+ continue;
+
+ /* ----------
+ * Get one attributes oldvalue. If it is NULL - they're not equal.
+ * ----------
+ */
+ newvalue = SPI_getbinval(newtup, rel->rd_att,
+ key->keypair[i][pairidx], &isnull);
+ if (isnull)
+ continue;
+
+ /* ----------
+ * Get the attributes type OID and call the '=' operator
+ * to compare the values.
+ * ----------
+ */
+ typeid = SPI_gettypeid(rel->rd_att, key->keypair[i][pairidx]);
+ if (!ri_AttributesEqual(typeid, oldvalue, newvalue))
+ continue;
+ keys_unequal = false;
+ }
+
+ return keys_unequal;
+}
+
+
+/* ----------
+ * ri_OneKeyEqual -
+ *
+ * Check if one key value in OLD and NEW is equal.
+ *
+ * ri_KeysEqual could call this but would run a bit slower. For
+ * now, let's duplicate the code.
+ * ----------
+ */
+static bool
+ri_OneKeyEqual(Relation rel, int column, HeapTuple oldtup, HeapTuple newtup,
+ RI_QueryKey *key, int pairidx)
+{
+ Oid typeid;
+ Datum oldvalue;
+ Datum newvalue;
+ bool isnull;
+
+ /* ----------
+ * Get one attributes oldvalue. If it is NULL - they're not equal.
+ * ----------
+ */
+ oldvalue = SPI_getbinval(oldtup, rel->rd_att,
+ key->keypair[column][pairidx], &isnull);
+ if (isnull)
+ return false;
+
+ /* ----------
+ * Get one attributes oldvalue. If it is NULL - they're not equal.
+ * ----------
+ */
+ newvalue = SPI_getbinval(newtup, rel->rd_att,
+ key->keypair[column][pairidx], &isnull);
+ if (isnull)
+ return false;
+
+ /* ----------
+ * Get the attributes type OID and call the '=' operator
+ * to compare the values.
+ * ----------
+ */
+ typeid = SPI_gettypeid(rel->rd_att, key->keypair[column][pairidx]);
+ if (!ri_AttributesEqual(typeid, oldvalue, newvalue))
+ return false;
+
+ return true;
+}
+
+
+/* ----------
* ri_AttributesEqual -
*
* Call the type specific '=' operator comparision function
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