Docs: Database transaction

Thu, 05 Jan 2017 00:00:00 +0000

Lets insert order with items as a single database transaction

Database structure for products table

create table `order`
(
 id varchar(40) charset utf8mb3 not null
 primary key,
 amount int not null,
 user_id int not null,
 status enum ('new', 'paid', 'returned') default 'new' not null,
 created_at timestamp default CURRENT_TIMESTAMP not null on update CURRENT_TIMESTAMP,
 constraint order_user_id_fk
 foreign key (user_id) references user (id)
);

create table order_item
(
 id int auto_increment
 primary key,
 order_id varchar(40) not null,
 product_id int not null,
 quantity int default 0 not null,
 constraint order_item__product_fk
 foreign key (product_id) references product (id),
 constraint order_item_order_id_fk
 foreign key (order_id) references `order` (id)
)
 charset = utf8mb3;

Create file ./rest/order-new.json

{
 "path": "/api/orders",
 "methods": [
 "POST"
 ],
 "query": "order-new",
 "authorized": true
}

Create file ./queries/order-new-js.json

{
 "type": "javascript",
 "id": "order-new",
 "file": "order-new.js",
 "public": true,
 "params": []
}

Create file ./js/order-new.js

let orderId = uuid(),
 currentTransaction = transaction("sample-database-connection"),
 orderData = null;

try {
 orderData = currentTransaction.run("orders-insert", {
 "id": orderId,
 "amount": totalPrice,
 "currentUserId": 1,
 }).Data

 currentTransaction.run("order-item-insert", {
 "orderId": orderData.id,
 "productId": 1,
 "quantity": 1
 })

 currentTransaction.run("order-item-insert", {
 "orderId": orderData.id,
 "productId": 2,
 "quantity": 22
 })

 currentTransaction.commit()
} catch (e) {
 currentTransaction.rollback()
 throw {"error": e}
}

setStatusCode(200)
setResult({
 orderId: orderData.id
})

POST http://localhost:8080/api/orders

{
 "orderId": "01ce6540-cdbf-43c7-8def-3abc45147e3b"
}

You could improve logic by sending extra parameters like product ids or perform more any complex business logic

ApiZilla – Sql

Docs: Database transaction