Stringsql="CREATE TABLE IF NOT EXISTS t_order_item "+"(order_item_id BIGINT NOT NULL AUTO_INCREMENT, order_id BIGINT NOT NULL, user_id INT NOT NULL, status VARCHAR(50), PRIMARY KEY (order_item_id))";
Stringsql="CREATE TABLE IF NOT EXISTS t_order (order_id BIGINT NOT NULL AUTO_INCREMENT, user_id INT NOT NULL, status VARCHAR(50), PRIMARY KEY (order_id))";