Add a trigger function to simulate FKEY constraints on inherited tables

[evergreen-equinox.git] / Open-ILS / src / sql / Pg / 000.functions.general.sql

diff --git a/Open-ILS/src/sql/Pg/000.functions.general.sql b/Open-ILS/src/sql/Pg/000.functions.general.sql
index 2f09a50..5204cee 100644 (file)
--- a/Open-ILS/src/sql/Pg/000.functions.general.sql
+++ b/Open-ILS/src/sql/Pg/000.functions.general.sql
@@ -24,6 +24,19 @@ EXECUTE 'ALTER DATABASE ' || quote_ident(current_database()) || ' SET ' || quote
 END;
 $$ LANGUAGE plpgsql;
 
+CREATE OR REPLACE FUNCTION evergreen.fake_fkey_tgr () RETURNS TRIGGER AS $F$
+DECLARE
+    copy_id BIGINT;
+BEGIN
+    EXECUTE 'SELECT ($1).' || quote_ident(TG_ARGV[0]) INTO copy_id USING NEW;
+    PERFORM * FROM asset.copy WHERE id = copy_id;
+    IF NOT FOUND THEN
+        RAISE EXCEPTION 'Key (%.%=%) does not exist in asset.copy', TG_TABLE_SCHEMA, TG_TABLE_NAME, copy_id;
+    END IF;
+    RETURN NULL;
+END;
+$F$ LANGUAGE PLPGSQL;
+
 SELECT evergreen.change_db_setting('search_path', ARRAY['evergreen','public','pg_catalog']);
 
 COMMIT;