Artikelpreishistorie: Fix für NULL-Behandlung im Trigger

diff --git a/sql/Pg-upgrade2/add_parts_price_history2.sql b/sql/Pg-upgrade2/add_parts_price_history2.sql
new file mode 100644 (file)
index 0000000..ebf0036
--- /dev/null
+++ b/sql/Pg-upgrade2/add_parts_price_history2.sql
@@ -0,0 +1,18 @@
+-- @tag: add_parts_price_history2
+-- @description: Korrigierte Triggerfunktion für Entwicklung der Stammdatenpreise
+-- @depends: add_parts_price_history
+CREATE OR REPLACE FUNCTION add_parts_price_history_entry() RETURNS "trigger" AS $$
+  BEGIN
+    IF      (TG_OP = 'UPDATE')
+        AND ((OLD.lastcost  IS NULL AND NEW.lastcost  IS NULL) OR (OLD.lastcost  = NEW.lastcost))
+        AND ((OLD.listprice IS NULL AND NEW.listprice IS NULL) OR (OLD.listprice = NEW.listprice))
+        AND ((OLD.sellprice IS NULL AND NEW.sellprice IS NULL) OR (OLD.sellprice = NEW.sellprice)) THEN
+      RETURN NEW;
+    END IF;
+
+    INSERT INTO parts_price_history (part_id, lastcost, listprice, sellprice, valid_from)
+    VALUES (NEW.id, NEW.lastcost, NEW.listprice, NEW.sellprice, now());
+
+    RETURN NEW;
+  END;
+$$ LANGUAGE plpgsql;