feat: order and item queries

api/queries/ItemQueries.go

@@ -0,0 +1,77 @@
+package queries
+
+const CREATE_ITEM = `
+INSERT INTO item(item_name, in_season) VALUES ($1, $2);
+`
+
+const CREATE_ITEM_PRICE = `
+INSERT INTO item_price_history(item_id, price) VALUES ($1, $2);
+`
+
+const SET_ITEM_PRICE_VALID_TO_DATE = `
+UPDATE item_price_history SET valid_to = now() 
+FROM (
+	SELECT item_id, MAX(valid_from) FROM item_price_history WHERE item_id = $1
+) as o
+WHERE item_id IN o.item_id
+`
+
+const GET_ITEM_PRICE = `
+SELECT
+	oi.item_id,
+	oi.order_id,
+	i.item_name,
+	oi.quantity,
+	oi.made,
+	oi.created_at,
+	oi.quantity * iph.price AS total_price,
+	iph.price AS unit_price
+FROM
+	order_item oi
+	INNER JOIN item i ON oi.item_id = i.id
+		AND oi.item_id = $1
+		AND oi.order_id = $2
+	INNER JOIN item_price_history iph ON iph.item_id = i.id
+		AND iph.valid_from <= oi.created_at
+		AND (iph.valid_to IS NULL OR iph.valid_to > oi.created_at);
+`
+
+const ADD_ITEM_TO_ORDER = `
+INSERT INTO order_item (item_id, order_id, quantity, created_at) VALUES ($1, $2, $3, $4) ON CONFLICT (item_id, order_id) DO UPDATE SET
+	quantity = $3,
+	created_at = $4`
+
+const SET_QUANTITY = `
+UPDATE order_item SET quantity = $1 WHERE item_id = $2 AND order_id = $3;
+`
+
+const SET_MADE = `
+UPDATE order_item SET made = $1 WHERE item_id = $2 AND order_id = $3;
+`
+
+const GET_ORDER_ITEMS = `
+SELECT
+	oi.item_id,
+	oi.order_id,
+	i.item_name,
+	oi.quantity,
+	oi.made,
+	oi.created_at,
+	oi.quantity * iph.price AS total_price,
+	iph.price AS unit_price
+FROM
+	order_item oi
+	INNER JOIN item i ON oi.item_id = i.init_db_pool
+		AND oi.order_id = $1
+	INNER JOIN item_price_history iph ON iph.item_id = i.id
+		AND iph.valid_from <= oi.created_at
+		AND (iph.valid_to IS NULL OR iph.valid_to > oi.created_at);
+`
+
+const REMOVE_ITEM_FROM_ORDER = `
+DELETE FROM order_item WHERE item_id = $1 AND order_id = $2;
+`
+
+const SET_ITEM_IS_IN_SEASON = `
+UPDATE item SET in_season = $1 WHERE id = $2;
+`

api/queries/OrderQueries.go

@@ -0,0 +1,31 @@
+package queries
+
+const CREATE_ORDER = `
+INSERT INTO order_record(user_id, orderer, date_due, date_placed) VALUES ($1, $2, $3, $4);
+`
+
+const SET_ORDER_FILLED = `
+UPDATE order_record SET filled = $1 WHERE id = $2
+`
+
+const SET_ORDER_DELIVERED = `
+UPDATE order_record SET delivered = $1 WHERE id = $2
+`
+
+const SET_ORDER_PAID = `
+UPDATE order_record SET amount_paid = $1 WHERE id = $2
+`
+
+const GET_ORDER_TOTAL_AND_BALANCE = `
+SELECT 
+	SUM(oi.quantity * iph.price) AS order_total,
+	order_total - orec.amount_paid AS balance
+FROM
+	order_item oi
+	INNER JOIN item i ON oi.item_id = i.init_db_pool
+		AND oi.order_id = $1
+	INNER JOIN order_record orec ON oi.order_id = orec.order_id
+	INNER JOIN item_price_history iph ON iph.item_id = i.id
+		AND iph.valid_from <= oi.created_at
+		AND (iph.valid_to IS NULL OR iph.valid_to > oi.created_at);
+`