/*
* Okay only if there's a suitable INSTEAD OF trigger. Messages
- * here should match rewriteHandler.c's rewriteTargetView, except
- * that we omit errdetail because we haven't got the information
- * handy (and given that we really shouldn't get here anyway, it's
- * not worth great exertion to get).
+ * here should match rewriteHandler.c's rewriteTargetView and
+ * RewriteQuery, except that we omit errdetail because we haven't
+ * got the information handy (and given that we really shouldn't
+ * get here anyway, it's not worth great exertion to get).
*/
switch (operation)
{
}
/*
- * If there were no INSTEAD rules, and the target relation is a view
- * without any INSTEAD OF triggers, see if the view can be
+ * If there was no unqualified INSTEAD rule, and the target relation
+ * is a view without any INSTEAD OF triggers, see if the view can be
* automatically updated. If so, we perform the necessary query
* transformation here and add the resulting query to the
* product_queries list, so that it gets recursively rewritten if
* necessary.
+ *
+ * If the view cannot be automatically updated, we throw an error here
+ * which is OK since the query would fail at runtime anyway. Throwing
+ * the error here is preferable to the executor check since we have
+ * more detailed information available about why the view isn't
+ * updatable.
*/
- if (!instead && qual_product == NULL &&
+ if (!instead &&
rt_entry_relation->rd_rel->relkind == RELKIND_VIEW &&
!view_has_instead_trigger(rt_entry_relation, event))
{
/*
+ * If there were any qualified INSTEAD rules, don't allow the view
+ * to be automatically updated (an unqualified INSTEAD rule or
+ * INSTEAD OF trigger is required).
+ *
+ * The messages here should match execMain.c's CheckValidResultRel
+ * and in principle make those checks in executor unnecessary, but
+ * we keep them just in case.
+ */
+ if (qual_product != NULL)
+ {
+ switch (parsetree->commandType)
+ {
+ case CMD_INSERT:
+ ereport(ERROR,
+ (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
+ errmsg("cannot insert into view \"%s\"",
+ RelationGetRelationName(rt_entry_relation)),
+ errdetail("Views with conditional DO INSTEAD rules are not automatically updatable."),
+ errhint("To enable inserting into the view, provide an INSTEAD OF INSERT trigger or an unconditional ON INSERT DO INSTEAD rule.")));
+ break;
+ case CMD_UPDATE:
+ ereport(ERROR,
+ (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
+ errmsg("cannot update view \"%s\"",
+ RelationGetRelationName(rt_entry_relation)),
+ errdetail("Views with conditional DO INSTEAD rules are not automatically updatable."),
+ errhint("To enable updating the view, provide an INSTEAD OF UPDATE trigger or an unconditional ON UPDATE DO INSTEAD rule.")));
+ break;
+ case CMD_DELETE:
+ ereport(ERROR,
+ (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
+ errmsg("cannot delete from view \"%s\"",
+ RelationGetRelationName(rt_entry_relation)),
+ errdetail("Views with conditional DO INSTEAD rules are not automatically updatable."),
+ errhint("To enable deleting from the view, provide an INSTEAD OF DELETE trigger or an unconditional ON DELETE DO INSTEAD rule.")));
+ break;
+ default:
+ elog(ERROR, "unrecognized CmdType: %d",
+ (int) parsetree->commandType);
+ break;
+ }
+ }
+
+ /*
+ * Attempt to rewrite the query to automatically update the view.
* This throws an error if the view can't be automatically
- * updated, but that's OK since the query would fail at runtime
- * anyway.
+ * updated.
*/
parsetree = rewriteTargetView(parsetree, rt_entry_relation);
ERROR: cannot update view "ro_view20"
DETAIL: Views that return set-returning functions are not automatically updatable.
HINT: To enable updating the view, provide an INSTEAD OF UPDATE trigger or an unconditional ON UPDATE DO INSTEAD rule.
+-- A view with a conditional INSTEAD rule but no unconditional INSTEAD rules
+-- or INSTEAD OF triggers should be non-updatable and generate useful error
+-- messages with appropriate detail
+CREATE RULE rw_view16_ins_rule AS ON INSERT TO rw_view16
+ WHERE NEW.a > 0 DO INSTEAD INSERT INTO base_tbl VALUES (NEW.a, NEW.b);
+CREATE RULE rw_view16_upd_rule AS ON UPDATE TO rw_view16
+ WHERE OLD.a > 0 DO INSTEAD UPDATE base_tbl SET b=NEW.b WHERE a=OLD.a;
+CREATE RULE rw_view16_del_rule AS ON DELETE TO rw_view16
+ WHERE OLD.a > 0 DO INSTEAD DELETE FROM base_tbl WHERE a=OLD.a;
+INSERT INTO rw_view16 (a, b) VALUES (3, 'Row 3'); -- should fail
+ERROR: cannot insert into view "rw_view16"
+DETAIL: Views with conditional DO INSTEAD rules are not automatically updatable.
+HINT: To enable inserting into the view, provide an INSTEAD OF INSERT trigger or an unconditional ON INSERT DO INSTEAD rule.
+UPDATE rw_view16 SET b='ROW 2' WHERE a=2; -- should fail
+ERROR: cannot update view "rw_view16"
+DETAIL: Views with conditional DO INSTEAD rules are not automatically updatable.
+HINT: To enable updating the view, provide an INSTEAD OF UPDATE trigger or an unconditional ON UPDATE DO INSTEAD rule.
+DELETE FROM rw_view16 WHERE a=2; -- should fail
+ERROR: cannot delete from view "rw_view16"
+DETAIL: Views with conditional DO INSTEAD rules are not automatically updatable.
+HINT: To enable deleting from the view, provide an INSTEAD OF DELETE trigger or an unconditional ON DELETE DO INSTEAD rule.
DROP TABLE base_tbl CASCADE;
NOTICE: drop cascades to 16 other objects
DETAIL: drop cascades to view ro_view1
UPDATE ro_view19 SET last_value=1000;
UPDATE ro_view20 SET b=upper(b);
+-- A view with a conditional INSTEAD rule but no unconditional INSTEAD rules
+-- or INSTEAD OF triggers should be non-updatable and generate useful error
+-- messages with appropriate detail
+CREATE RULE rw_view16_ins_rule AS ON INSERT TO rw_view16
+ WHERE NEW.a > 0 DO INSTEAD INSERT INTO base_tbl VALUES (NEW.a, NEW.b);
+CREATE RULE rw_view16_upd_rule AS ON UPDATE TO rw_view16
+ WHERE OLD.a > 0 DO INSTEAD UPDATE base_tbl SET b=NEW.b WHERE a=OLD.a;
+CREATE RULE rw_view16_del_rule AS ON DELETE TO rw_view16
+ WHERE OLD.a > 0 DO INSTEAD DELETE FROM base_tbl WHERE a=OLD.a;
+
+INSERT INTO rw_view16 (a, b) VALUES (3, 'Row 3'); -- should fail
+UPDATE rw_view16 SET b='ROW 2' WHERE a=2; -- should fail
+DELETE FROM rw_view16 WHERE a=2; -- should fail
+
DROP TABLE base_tbl CASCADE;
DROP VIEW ro_view10, ro_view12, ro_view18;
DROP SEQUENCE uv_seq CASCADE;
projects / postgresql.git / commitdiff