sequelize 用于PostgreSQL，MySQL，SQLite和MSSQL的Node.js / io.js ORM

安装

Sequelize可通过NPM获得。

$ npm install --save sequelize

# And one of the following:
$ npm install --save pg pg-hstore
$ npm install --save mysql // For both mysql and mariadb dialects
$ npm install --save sqlite3
$ npm install --save tedious // MSSQL

建立连接

Sequelize将在初始化时设置一个连接池，因此理想情况下只应为每个数据库创建一个实例。

var sequelize = new Sequelize('database', 'username', 'password', {
  host: 'localhost',
  dialect: 'mysql'|'mariadb'|'sqlite'|'postgres'|'mssql',

  pool: {
    max: 5,
    min: 0,
    idle: 10000
  },

  // SQLite only
  storage: 'path/to/database.sqlite'
});

// Or you can simply use a connection uri
var sequelize = new Sequelize('postgres://user:pass@example.com:5432/dbname');

你的第一个模型

模型使用sequelize.define('name', {attributes}, {options})。

var User = sequelize.define('user', {
  firstName: {
    type: Sequelize.STRING,
    field: 'first_name' // Will result in an attribute that is firstName when user facing but first_name in the database
  },
  lastName: {
    type: Sequelize.STRING
  }
}, {
  freezeTableName: true // Model tableName will be the same as the model name
});

User.sync({force: true}).then(function () {
  // Table created
  return User.create({
    firstName: 'John',
    lastName: 'Hancock'
  });
});

参考链接：https://sequelize.readthedocs.io/en/v3/docs/getting-started/#setting-up-a-connection