promise-mysql2
v1.0.0
Published
A promise wrapper for node-mysql
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Promise-mysql2
Promise-mysql2 is a wrapper for mysqljs/mysql that wraps function calls with promises.
node >= 8.0
To install promise-mysql, use npm:
$ npm install promise-mysql2
Please refer to mysqljs/mysql for documentation on how to use the mysql functions.
At the minute only the standard connection (using .createConnection()
) and the pool (using .createPool()
) is supported. createPoolCluster
is not implemented yet.
Examples
Connection
Important note: don't forget to call connection.end() when you're finished otherwise the Node process won't finish
To connect, you simply call .createConnection()
like you would on mysqljs/mysql:
const mysql = require('promise-mysql2');
mysql.createConnection({
host: 'localhost',
user: 'dashaibi',
password: 'dashaibi',
database: 'dashaibi'
}).then((conn) => {
// do stuff with conn
conn.end();
});
To use the promise, you call the methods as you would if you were just using mysqljs/mysql, minus the callback. You then add a .then() with your function in:
const mysql = require('promise-mysql2');
mysql.createConnection({
host: 'localhost',
user: 'dashaibi',
password: 'dashaibi',
database: 'dashaibi'
}).then((conn) => {
let result = conn.query('select `name` from user');
conn.end();
return result;
}).then(([rows, fields]) => {
// list of user
console.log(rows);
});
You can even chain the promises, using a return within the .then():
const mysql = require('promise-mysql2');
let connection;
mysql.createConnection({
host: 'localhost',
user: 'dashaibi',
password: 'dashaibi',
database: 'dashaibi'
}).then((conn) => {
connection = conn;
return connection.query('select `id` from user where `name`="dashabi"');
}).then(([rows, fields]) => {
// Query the items that dashabi owns.
let result = connection.query('select * from items where `owner`="' + rows[0].id + '" and `name`="dashabi"');
connection.end();
return result;
}).then(([rows, fields]) => {
// Logs out that dashabi owns
console.log(rows);
});
You can catch errors using the .catch() method. You can still add .then() clauses, they'll just get skipped if there's an error
const mysql = require('promise-mysql2');
let connection;
mysql.createConnection({
host: 'localhost',
user: 'dashaibi',
password: 'dashaibi',
database: 'dashaibi'
}).then((conn) => {
connection = conn;
return connection.query('select * from tablethatdoesnotexist');
}).then(() => {
let result = connection.query('select * from user');
connection.end();
return result;
}).catch((error) => {
if (connection && connection.end) connection.end();
//logs out the error
console.log(error);
});
To use the async/await, you call the methods as you would if you were just using mysqljs/mysql.
const mysql = require('promise-mysql2');
let connection = await mysql.createConnection({
host: 'localhost',
user: 'dashaibi',
password: 'dashaibi',
database: 'dashaibi'
});
const [rows, fields] = await connection.query('select `id` from user where `name`="dashabi"');
connection.end();
console.log(rows);
Pool
Use pool directly:
pool = mysql.createPool({
host: 'localhost',
user: 'dashaibi',
password: 'dashaibi',
database: 'dashaibi'
connectionLimit: 10
});
pool.query('select `name` from user').then(([rows, fields]){
// Logs out a list of user
console.log(rows);
});
Get a connection from the pool:
let conn;
pool.getConnection().then((connection) => {
conn = connection;
conn.query('select `name` from user').then(...);
conn.release();
}).catch((err) => {
conn.release();
done(err);
});
To use the async/await, you call the methods as you would if you were just using mysqljs/mysql.
const pool = mysql.createPool({
host: 'localhost',
user: 'dashaibi',
password: 'dashaibi',
database: 'dashaibi'
connectionLimit: 10
});
const [rows, fields] = await pool.query('select `name` from user');
console.log(rows);
// get connection from pool
const conn = await pool.getConnection();
const [rows, fields] = await connection.query('select `name` from user');
conn.release();
console.log(rows);
Tests
At the moment only simple basics tests are implemented using Mocha. To run the tests, you need to connect to a running MySQL server. A database or write permissions are not required.
Start the test suite with
DB_HOST=localhost DB_USER=user DB_PWD=pwd npm test