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createPoolCluster

info

For queries please see the Simple Queries and Prepared Statements examples.

add(group, connectionUri)​

add(group: string, connectionUri: string)

import mysql from 'mysql2/promise';

try {
  const poolCluster = mysql.createPoolCluster();

  poolCluster.add('clusterA', 'mysql://root:password@localhost:3306/test');
  // poolCluster.add('clusterB', '...');

  const connection = await poolCluster.getConnection('clusterA');
  // ... some query

  connection.release();
} catch (err) {
  console.log(err);
}
atenção

Don't forget to release the connection when finished by using:

  • connection.release()

add(group, config)​

add(group: string, config: PoolOptions)

import mysql from 'mysql2/promise';

try {
  const poolCluster = mysql.createPoolCluster();

  poolCluster.add('clusterA', {
    host: 'localhost',
    user: 'root',
    database: 'test',
    // port: 3306,
    // password: '',
  });
  // poolCluster.add('clusterB', '...');

  const connection = await poolCluster.getConnection('clusterA');
  // ... some query

  connection.release();
} catch (err) {
  console.log(err);
}
atenção

Don't forget to release the connection when finished by using:

  • connection.release()

add(group, config) — SHA1​

add(group: string, config: PoolOptions)

import mysql from 'mysql2/promise';

try {
  const poolCluster = mysql.createPoolCluster();

  poolCluster.add('clusterA', {
    // ...
    passwordSha1: Buffer.from(
      '8bb6118f8fd6935ad0876a3be34a717d32708ffd',
      'hex'
    ),
  });
  // poolCluster.add('clusterB', '...');

  const connection = await poolCluster.getConnection('clusterA');
  // ... some query

  connection.release();
} catch (err) {
  console.log(err);
}
atenção

Don't forget to release the connection when finished by using:

  • connection.release()

add(group, config) — SSL​

add(group: string, config: PoolOptions)

import mysql from 'mysql2/promise';

try {
  const poolCluster = mysql.createPoolCluster();

  poolCluster.add('clusterA', {
    // ...
    ssl: {
      // key: fs.readFileSync('./certs/client-key.pem'),
      // cert: fs.readFileSync('./certs/client-cert.pem')
      ca: fs.readFileSync('./certs/ca-cert.pem'),
    },
  });
  // poolCluster.add('clusterB', '...');

  const connection = await poolCluster.getConnection('clusterA');
  // ... some query

  connection.release();
} catch (err) {
  console.log(err);
}
atenção

Don't forget to release the connection when finished by using:

  • connection.release()

add(group, config) — RDS SSL​

add(group: string, config: PoolOptions)

You can use Amazon RDS string as value to ssl property to connect to Amazon RDS MySQL over SSL.

In that case https://s3.amazonaws.com/rds-downloads/mysql-ssl-ca-cert.pem CA cert is used:

import mysql from 'mysql2/promise';

try {
  const poolCluster = mysql.createPoolCluster();

  poolCluster.add('clusterA', {
    // ...
    host: 'db.id.ap-southeast-2.rds.amazonaws.com',
    ssl: 'Amazon RDS',
  });
  // poolCluster.add('clusterB', '...');

  const connection = await poolCluster.getConnection('clusterA');
  // ... some query

  connection.release();
} catch (err) {
  console.log(err);
}
Testing
try {
  const [res] = await connection.query('SHOW `status` LIKE "Ssl_cipher"');
  await poolCluster.end();

  console.log(res);
} catch (err) {
  console.log(err);
}
atenção

Don't forget to release the connection when finished by using:

  • connection.release()

add(group, config) — Socks​

add(group: string, config: PoolOptions)

const mysql = require('mysql2');
const SocksConnection = require('socksjs');

const socksProxy = new SocksConnection({ port: 3306 });
const poolCluster = mysql.createPoolCluster();

poolCluster.add('clusterA', {
  stream: socksProxy,
});
// poolCluster.add('clusterB', '...');

const poolNamespace = poolCluster.of('clusterA');
Testing
poolNamespace.execute('SELECT SLEEP(1.1) AS `www`', (err, rows, fields) => {
  if (err instanceof Error) {
    console.log(err);
    return;
  }

  console.log(rows, fields);
});

poolNamespace.execute('SELECT SLEEP(1) AS `qqq`', (err, rows, fields) => {
  if (err instanceof Error) {
    console.log(err);
    return;
  }

  console.log(rows, fields);
});

poolNamespace.execute('SELECT SLEEP(1) AS `qqq`', (err, rows, fields) => {
  if (err instanceof Error) {
    console.log(err);
    return;
  }

  console.log(rows, fields);
});

Glossary​

PoolOptions​

PoolOptions extends all options from ConnectionOptions:

ConnectionOptions Specification
PoolOptions Specification