使用node.js，如何写入一个MySQL DB并从另一个读取？

Question

Specifically, I'm talking about MySQL Master-Slave(s) Replication . As I understand it, all of my reads should happen from a slave (or multiple slaves hid behind a load balancer) and all of my writes directly to the master.

How can I do this with node.js ? I'm using the MySQL Active Record package for my database queries and I don't think that supports it natively. I supposed I can hack away at the package and have a if is write-query, then use db1 type of situation, but I wonder if there's an easier way.

Answer 1

You can just create two adapters like this:

var activeRecord = require('mysql-activerecord');
var readDB = new activeRecord.Adapter({
    server: 'slave.db.com',
    username: 'user',
    password: 'pass',
    database: 'db'
});
var writeDB = new activeRecord.Adapter({
    server: 'master.db.com',
    username: 'user',
    password: 'pass',
    database: 'db'
});

When you go to do an update or other writing query, use writeDB ; when you go to do a select use readDB .

Another option would be to switch to another ORM that supports this out of the box. I know this isn't as nice of a solution though. Sequelize for example is widely used and supports this out of the box.