Go-MySQL-Driver

A MySQL-Driver for Go's database/sql package

Current tagged Release: May 14, 2013 (Version 1.0)

(master branch)

Features
Requirements
Installation
Usage
Testing / Development
License

Features

Lightweight and fast
Native Go implementation. No C-bindings, just pure Go
Connections over TCP/IPv4, TCP/IPv6 or Unix domain sockets
Automatic handling of broken connections
Automatic Connection Pooling (by database/sql package)
Supports queries larger than 16MB
Full sql.RawBytes support.
Intelligent LONG DATA handling in prepared statements
Secure LOAD DATA LOCAL INFILE support with file Whitelisting and io.Reader support
Optional time.Time parsing

Requirements

Go 1.1 or higher (use v1.0 for Go 1.0.x)
MySQL (Version 4.1 or higher), MariaDB or Percona Server

Installation

Simple install the package to your $GOPATH with the go tool from shell:

$ go get github.com/go-sql-driver/mysql

Make sure Git is installed on your machine and in your system's PATH.

Usage

Go MySQL Driver is an implementation of Go's database/sql/driver interface. You only need to import the driver and can use the full database/sql API then.

Use mysql as driverName and a valid DSN as dataSourceName:

import "database/sql"
import _ "github.com/go-sql-driver/mysql"

db, err := sql.Open("mysql", "user:password@/dbname")

Examples are available in our Wiki.

DSN (Data Source Name)

The Data Source Name has a common format, like e.g. PEAR DB uses it, but without type-prefix (optional parts marked by squared brackets):

[username[:password]@][protocol[(address)]]/dbname[?param1=value1&...&paramN=valueN]

A DSN in its fullest form:

username:password@protocol(address)/dbname?param=value

Except of the databasename, all values are optional. So the minimal DSN is:

/dbname

If you do not want to preselect a database, leave dbname empty:

Password

Passwords can consist of any character. Escaping is not necessary.

Protocol

See net.Dial for more information which networks are available. In general you should use an Unix domain socket if available and TCP otherwise for best performance.

Address

For TCP and UDP networks, addresses have the form host:port. If host is a literal IPv6 address, it must be enclosed in square brackets. The functions net.JoinHostPort and net.SplitHostPort manipulate addresses in this form.

For Unix domain sockets the address is the absolute path to the MySQL-Server-socket, e.g. /var/run/mysqld/mysqld.sock or /tmp/mysql.sock.

Parameters

Parameters are case-sensitive!

Possible Parameters are:

allowAllFiles: allowAllFiles=true disables the file Whitelist for LOAD DATA LOCAL INFILE and allows all files. Might be insecure!
charset: Sets the charset used for client-server interaction ("SET NAMES value"). If multiple charsets are set (separated by a comma), the following charset is used if setting the charset failes. This enables support for utf8mb4 (introduced in MySQL 5.5.3) with fallback to utf8 for older servers (charset=utf8mb4,utf8).
clientFoundRows: clientFoundRows=true causes an UPDATE to return the number of matching rows instead of the number of rows changed.
loc: Sets the location for time.Time values (when using parseTime=true). The default is UTC. "Local" sets the system's location. See time.LoadLocation for details.
parseTime: parseTime=true changes the output type of DATE and DATETIME values to time.Time instead of []byte / string
strict: Enable strict mode. MySQL warnings are treated as errors.
timeout: Driver side connection timeout. The value must be a string of decimal numbers, each with optional fraction and a unit suffix ( "ms", "s", "m", "h" ), such as "30s", "0.5m" or "1m30s". To set a server side timeout, use the parameter wait_timeout.
tls: true enables TLS / SSL encrypted connection to the server. Use skip-verify if you want to use a self-signed or invalid certificate (server side). Use a custom value registered with mysql.RegisterTLSConfig.

All other parameters are interpreted as system variables:

autocommit: "SET autocommit=value"
time_zone: "SET time_zone=value"
tx_isolation: "SET tx_isolation=value"
param: "SET param=value"

Examples

user@unix(/path/to/socket)/dbname

user:password@tcp(localhost:5555)/dbname?autocommit=true

user:password@tcp([de:ad:be:ef::ca:fe]:80)/dbname?tls=skip-verify&charset=utf8mb4,utf8

user:password@/dbname

No Database preselected:

user:password@/

`LOAD DATA LOCAL INFILE` support

For this feature you need direct access to the package. Therefore you must change the import path (no _):

import "github.com/go-sql-driver/mysql"

Files must be whitelisted by registering them with mysql.RegisterLocalFile(filepath) (recommended) or the Whitelist check must be deactivated by using the DSN parameter allowAllFiles=true (Might be insecure!).

To use a io.Reader a handler function must be registered with mysql.RegisterReaderHandler(name, handler) which returns a io.Reader or io.ReadCloser. The Reader is available with the filepath Reader::<name> then.

See the godoc of Go-MySQL-Driver for details.

`time.Time` support

The default internal output type of MySQL DATE and DATETIME values is []byte which allows you to scan the value into a []byte, string or sql.RawBytes variable in your programm.

However, many want to scan MySQL DATE and DATETIME values into time.Time variables, which is the logical opposite in Go to DATE and DATETIME in MySQL. You can do that by changing the internal output type from []byte to time.Time with the DSN parameter parseTime=true. You can set the default time.Time location with the loc DSN parameter.

Caution: As of Go 1.1, this makes time.Time the only variable type you can scan DATE and DATETIME values into. This breaks for example sql.RawBytes support.

Alternatively you can use the NullTime type as the scan destination, which works with both time.Time and string / []byte.

Unicode support

Since version 1.1 Go-MySQL-Driver automatically uses the collation utf8_general_ci by default. Adding &charset=utf8 (alias for SET NAMES utf8) to the DSN is not necessary anymore in most cases.

See http://dev.mysql.com/doc/refman/5.7/en/charset-unicode.html for more details on MySQL's Unicode support.

Testing / Development

To run the driver tests you may need to adjust the configuration. See the Testing Wiki-Page for details.

Go-MySQL-Driver is not feature-complete yet. Your help is very appreciated. If you want to contribute, you can work on an open issue or review a pull request.

Code changes must be proposed via a Pull Request and must be reviewed. Only LGTM-ed (" Looks good to me ") code may be committed to the master branch.

License

Go-MySQL-Driver is licensed under the Mozilla Public License Version 2.0

Mozilla summarizes the license scope as follows:

MPL: The copyleft applies to any files containing MPLed code.

That means:

You can use the unchanged source code both in private as also commercial
You needn't publish the source code of your library as long the files licensed under the MPL 2.0 are unchanged
You must publish the source code of any changed files licensed under the MPL 2.0 under a) the MPL 2.0 itself or b) a compatible license (e.g. GPL 3.0 or Apache License 2.0)

Please read the MPL 2.0 FAQ if you have further questions regarding the license.

You can read the full terms here: LICENSE

Tendros/mysql