Node.js 的 ORM 框架：rdb

rdb 是 Node.js 的一個 ORM 框架，支持 Postgres 和 MySQL 數據庫。

特點：

• 簡單靈活的映射器

• 支持事務處理

• 可定制的持久化策略

• 支持延遲加載

• 基于 promises.

示例代碼：

var rdb = require('rdb');

var Customer = rdb.table('_customer');

Customer.primaryColumn('cId').guid().as('id');
Customer.column('cName').string().as('name');
Customer.column('cBalance').numeric().as('balance');
Customer.column('cRegdate').date().as('registeredDate');
Customer.column('cIsActive').boolean().as('isActive');
Customer.column('cPicture').binary().as('picture');

var db = rdb('postgres://postgres:postgres@localhost/test');

db.transaction()
    .then(getById)
    .then(printCustomer)
    .then(rdb.commit)
    .then(null, rdb.rollback)
    .then(onOk, onFailed);

function getById() {
    return Customer.getById('a0000000-0000-0000-0000-000000000000');
}

function printCustomer(customer) {
    var format = 'Customer Id: %s, name: %s, Balance: %s, Registered Date: %s, Is Active: %s, Picture: %s'; 
    var args = [format, customer.id, customer.name, customer.balance, customer.registeredDate, customer.isActive, customer.picture];
    console.log.apply(null,args);
}

function onOk() {
    console.log('Success');
    console.log('Waiting for connection pool to teardown....');
}

function onFailed(err) {
    console.log('Rollback');
    console.log(err);
}

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