mysql-magic

Promised based, high-level mysql library extension for Node.js >=7.6.

yarn add mysql-magic --save

Features

• Supports multiple named connection pools (different database settings with global scope)
• Safe async connection scopes - execute querys with build-in error handling
• High-level API
• Designed to run with the pure power of native Promise, await and async function

Usage

Application Bootstrap

const _mysqlMagic = require('mysql-magic');
 
// somewhere during your applications bootstrap...initialize a custom pool. It consumes any pool-options of [mysqljs](https://github.com/mysqljs/mysql)
_mysqlMagic.initPool('userdb', {
    host     : 'localhost',
    user     : 'me',
    password : 'secret',
    database : 'my_db'
});

Run Querys

// get the pool
const _db = require('mysql-magic').getPool('userdb');
 
// wait for connection becomes available
const con = await _db.getConnection();
 
// execute query
const [result, fields] = await con.query('SELECT * FROM `users` LIMIT 10;');
 
// release connection
await con.release();

Run Querys within scope

Within a connection scope, the connection will be automatically closed on finish or in case of an error. All kind of errors are proxied as exception.

const _db = require('mysql-magic');
 
// retrieve connection scope
const numUsers = await _db.getConnection('userdb', async function(){
    // run query
    const [rows, fields] = await this.query('SELECT COUNT(*) as `count` FROM `users`;');
 
    return rows.count;
});
 
console.log(numUsers);

API

• initPool
• getPool
• getConnection()
• Pool::getConnection
• Connection::release
• Connection::query
• Connection::insert
• Connection::fetchRow
• Connection::fetchAll

mysql-magic::initPool

Description: Initializes a new named connection pool. Pass mysql connection options as second argument (passthrough)

Syntax: pool:Object = initPool(name:String, options:Object)

const _db = require('mysql-magic');
 
// initialize a new "named" pool
initPool('userdb', {
    // db credentials
    host: 'localhost',
    user: 'bob',
    password: 'secret',
    database: 'my_user_db'
 
    // special pool options
    connectionLimit: 50,
    acquireTimeout: 1000,
    waitForConnections: true,
    queueLimit: 200
});
 
// initialize default pool
initPool(null, {
    ...
})

mysql-magic::getPool

Description: Retrieves a named connection pool

Syntax: const pool:Object = getPool([name:String])

// get the userdb pool
const _db = require('mysql-magic').getPool('userdb');
 
// request a connection
const con = await _db.getConnection();
...

mysql-magic::getConnection

Description: Retrieves a connection using async connection scope

Syntax: const result:Object = getConnection([name:String], scope:async-function)

Notice: A connection scope will automatically call con.release() in the end or on an error - exceptions are forwarded

Example 1 - Named Pool

// just include the module
const _db = require('mysql-magic');
 
// retrieve connection scope using userdb
const numUsers = await _db.getConnection('userdb', async function(){
    // run query
    const [rows, fields] = await this.query('SELECT COUNT(*) as num FROM users;');
 
    return rows[0].num;
});
 
console.log(numUsers);
...

Example 2 - Default Pool

// just include the module
const _db = require('mysql-magic');
 
// retrieve connection scope using default pool
const numUsers = await _db.getConnection(async function(){
    // run query
    const [rows, fields] = await this.query('SELECT COUNT(*) as num FROM users;');
 
    return rows[0].num;
});
 
console.log(numUsers);
...

mysql-magic::Pool::getConnection

Description: Requests a connection from given pool

Syntax: const connection:Object = Pool::getConnection([scope:async-function])

Notice: A connection scope will automatically call con.release() in the end or on an error - exceptions are forwarded

Example 1

// get the userdb pool
const _db = require('mysql-magic').getPool('userdb');
 
// request a connection
const con = await _db.getConnection();
 
// do something
...

Example 2 - Scopes

const _db = require('mysql-magic');
 
// retrieve connection scope
const result = await _db.getConnection('userdb', async function(){
    // run query
    const [rows, fields] = await this.query('SELECT * FROM log LIMIT 20;');
    return rows.length;
});
 
console.log(result);

mysql-magic::Connection::release

Description: Releases the connection

Syntax: Connection::release()

// get the userdb pool
const _db = require('mysql-magic').getPool('userdb');
 
// request a connection
const con = await _db.getConnection();
 
// do something
...
 
// release the connection
con.release();

mysql-magic::Connection::query

Description: Executes a mysql query

Syntax: const [result:Object, fields:Object] = Connection::query(sql:string, [values:Object])

// get the userdb pool
const _db = require('mysql-magic').getPool('userdb');
 
// request a connection
const con = await _db.getConnection();
 
// do something
const [result] = await con.query('SELECT * FROM `users LIMIT 100`;');
 
console.log(result);
 
// release the connection
con.release();

mysql-magic::Connection::insert

Description: Executes a insert with given values wrapped into object

Syntax: const [insertID:int, result:Object] = Connection::insert(table:string, values:Object)

// get the userdb pool
const _db = require('mysql-magic').getPool('userdb');
 
// request a connection
const con = await _db.getConnection();
 
// insert a new user
const [userid] = await con.insert('users', {
    name: 'John',
    email: '[e-mail]',
    login: 'johndow1234'
});
 
console.log(result);
 
// release the connection
con.release();

mysql-magic::Connection::fetchRow

Description: Executes a query an returns a single result as object

Syntax: const [result:Object] = Connection::fetchRow(sql:string, [values:Object])

// get the userdb pool
const _db = require('mysql-magic').getPool('userdb');
 
// request a connection
const con = await _db.getConnection();
 
// fetch user by its name
const user = await _db.fetchRow('SELECT * FROM `users` WHERE `name` LIKE ? LIMIT 1;', ['John']);
 
console.log(result);
 
// release the connection
con.release();

mysql-magic::Connection::fetchAll

Description: Executes a query an returns an array of objects (similar to query but returns an empty array in case of empty resultset)

Syntax: const [results:Array] = Connection::fetchAll(sql:string, [values:Object])

// get the userdb pool
const _db = require('mysql-magic').getPool('userdb');
 
// request a connection
const con = await _db.getConnection();
 
// fetch all users
const users = await _db.fetchAll('SELECT * FROM `users`;');
 
// show users
for (const user in users){
    console.log('User[', user.id, '] - ', user.name);
}
 
// release the connection
con.release

Any Questions ? Report a Bug ? Enhancements ?

Please open a new issue on GitHub

License

mysql-magic is OpenSource and licensed under the Terms of The MIT License