π¬ Non-blocking, event-driven Swift client for MySQL.
Major Releases
The table below shows a list of MySQLKit major releases alongside their compatible NIO and Swift versions.
Version | NIO | Swift | SPM |
---|---|---|---|
4.0 | 2.0 | 5.2+ | from: "4.0.0" |
3.0 | 1.0 | 4.0+ | from: "3.0.0" |
2.0 | N/A | 3.1+ | from: "2.0.0" |
1.0 | N/A | 3.1+ | from: "1.0.0" |
Use the SPM string to easily include the dependency in your Package.swift
file.
.package(url: "https://github.com/vapor/mysql-kit.git", from: ...)
Supported Platforms
MySQLKit supports the following platforms:
- Ubuntu 16.04+
- macOS 10.15+
Overview
MySQLKit is a MySQL client library built on SQLKit. It supports building and serializing MySQL-dialect SQL queries. MySQLKit uses MySQLNIO to connect and communicate with the database server asynchronously. AsyncKit is used to provide connection pooling.
Configuration
Database connection options and credentials are specified using a MySQLConfiguration
struct.
import MySQLKit
let configuration = MySQLConfiguration(
hostname: "localhost",
port: 3306,
username: "vapor_username",
password: "vapor_password",
database: "vapor_database"
)
URL string based configuration is also supported.
guard let configuration = MySQLConfiguration(url: "mysql://...") else {
...
}
To connect via unix-domain sockets, use unixDomainSocketPath
instead of hostname
and port
.
let configuration = MySQLConfiguration(
unixDomainSocketPath: "/path/to/socket",
username: "vapor_username",
password: "vapor_password",
database: "vapor_database"
)
Connection Pool
Once you have a MySQLConfiguration
, you can use it to create a connection source and pool.
let eventLoopGroup: EventLoopGroup = ...
defer { try! eventLoopGroup.syncShutdown() }
let pools = EventLoopGroupConnectionPool(
source: MySQLConnectionSource(configuration: configuration),
on: eventLoopGroup
)
defer { pools.shutdown() }
First create a MySQLConnectionSource
using the configuration struct. This type is responsible for creating new connections to your database server as needed.
Next, use the connection source to create an EventLoopGroupConnectionPool
. You will also need to pass an EventLoopGroup
. For more information on creating an EventLoopGroup
, visit SwiftNIO's documentation. Make sure to shutdown the connection pool before it deinitializes.
EventLoopGroupConnectionPool
is a collection of pools for each event loop. When using EventLoopGroupConnectionPool
directly, random event loops will be chosen as needed.
pools.withConnection { conn
print(conn) // MySQLConnection on randomly chosen event loop
}
To get a pool for a specific event loop, use pool(for:)
. This returns an EventLoopConnectionPool
.
let eventLoop: EventLoop = ...
let pool = pools.pool(for: eventLoop)
pool.withConnection { conn
print(conn) // MySQLConnection on eventLoop
}
MySQLDatabase
Both EventLoopGroupConnectionPool
and EventLoopConnectionPool
can be used to create instances of MySQLDatabase
.
let mysql = pool.database(logger: ...) // MySQLDatabase
let rows = try mysql.simpleQuery("SELECT @@version;").wait()
Visit MySQLNIO's docs for more information on using MySQLDatabase
.
SQLDatabase
A MySQLDatabase
can be used to create an instance of SQLDatabase
.
let sql = mysql.sql() // SQLDatabase
let planets = try sql.select().column("*").from("planets").all().wait()
Visit SQLKit's docs for more information on using SQLDatabase
.