1 files changed, 27 insertions, 0 deletions
diff --git a/data/sql/trigger.sql b/data/sql/trigger.sql
new file mode 100644
index 0000000..d26a39d
--- /dev/null
+++ b/data/sql/trigger.sql
@@ -0,0 +1,27 @@
+BEGIN TRANSACTION;
+CREATE TRIGGER IF NOT EXISTS update_product_amount_on_restock_insert AFTER INSERT ON restock BEGIN
+	UPDATE products SET amount = products.amount + NEW.amount WHERE products.id = NEW.product;
+END;
+
+CREATE TRIGGER IF NOT EXISTS update_product_amount_on_restock_delete AFTER DELETE ON restock BEGIN
+	UPDATE products SET amount = products.amount - OLD.amount WHERE products.id = OLD.product;
+END;
+
+CREATE TRIGGER IF NOT EXISTS update_product_amount_on_restock_update AFTER UPDATE ON restock BEGIN
+	UPDATE products SET amount = products.amount - OLD.amount WHERE products.id = OLD.product;
+	UPDATE products SET amount = products.amount + NEW.amount WHERE products.id = NEW.product;
+END;
+
+CREATE TRIGGER IF NOT EXISTS update_product_amount_on_sales_insert AFTER INSERT ON sales BEGIN
+	UPDATE products SET amount = products.amount - 1 WHERE products.id = NEW.product;
+END;
+
+CREATE TRIGGER IF NOT EXISTS update_product_amount_on_sales_delete AFTER DELETE ON sales BEGIN
+	UPDATE products SET amount = products.amount + 1 WHERE products.id = OLD.product;
+END;
+
+CREATE TRIGGER IF NOT EXISTS update_product_amount_on_sales_update AFTER UPDATE ON sales BEGIN
+	UPDATE products SET amount = products.amount + 1 WHERE products.id = OLD.product;
+	UPDATE products SET amount = products.amount - 1 WHERE products.id = NEW.product;
+END;
+COMMIT;