mysql

README

Go-MySQL-Driver

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

Current tagged Release: June 03, 2013 (Version 1.0.1)

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• Features
• Requirements
• Installation
• Usage
  • DSN (Data Source Name)
    • Password
    • Protocol
    • Address
    • Parameters
    • Examples
  • LOAD DATA LOCAL INFILE support
  • time.Time support
• Testing / Development
• License

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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 1.0.3 or higher
• MySQL (Version 4.1 or higher), MariaDB or Percona Server

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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, e := sql.Open("mysql", "user:password@/dbname?charset=utf8")

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:

• 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.
• 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).
• allowAllFiles: allowAllFiles=true disables the file Whitelist for LOAD DATA LOCAL INFILE and allows all files. Might be insecure!
• parseTime: parseTime=true changes the output type of DATE and DATETIME values to time.Time instead of []byte / string
• 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.
• strict: Enable strict mode. MySQL warnings are treated as errors.

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?charset=utf8&autocommit=true

user:password@tcp([de:ad:be:ef::ca:fe]:80)/dbname?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 also the godoc of Go-MySQL-Driver

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.

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.

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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

Documentation

Overview

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

Index

• func DeregisterLocalFile(filepath string)
• func DeregisterReaderHandler(name string)
• func RegisterLocalFile(filepath string)
• func RegisterReaderHandler(name string, handler func() io.Reader)
• type MySQLError
  • func (me *MySQLError) Error() string
• type MySQLWarnings
  • func (mws MySQLWarnings) Error() string
• type NullTime
  • func (nt *NullTime) Scan(value interface{}) (err error)
  • func (nt NullTime) Value() (driver.Value, error)

Functions

func DeregisterLocalFile

func DeregisterLocalFile(filepath string)

DeregisterLocalFile removes the given filepath from the whitelist.

func DeregisterReaderHandler

func DeregisterReaderHandler(name string)

DeregisterReaderHandler removes the ReaderHandler function with the given name from the registry.

func RegisterLocalFile

func RegisterLocalFile(filepath string)

RegisterLocalFile adds the given file to the file whitelist, so that it can be used by "LOAD DATA LOCAL INFILE <filepath>". Alternatively you can allow the use of all local files with the DSN parameter 'allowAllFiles=true'

func RegisterReaderHandler

func RegisterReaderHandler(name string, handler func() io.Reader)

RegisterReaderHandler registers a handler function which is used to receive a io.Reader. The Reader can be used by "LOAD DATA LOCAL INFILE Reader::<name>". If the handler returns a io.ReadCloser Close() is called when the request is finished.

Types

type MySQLError

type MySQLError struct {
	Number  uint16
	Message string
}

error type which represents a single MySQL error

func (*MySQLError) Error

func (me *MySQLError) Error() string

type MySQLWarnings

type MySQLWarnings []mysqlWarning

error type which represents a group of one or more MySQL warnings

func (MySQLWarnings) Error

func (mws MySQLWarnings) Error() string

type NullTime

type NullTime struct {
	Time  time.Time
	Valid bool // Valid is true if Time is not NULL
}

NullTime represents a time.Time that may be NULL. NullTime implements the Scanner interface so it can be used as a scan destination:

var nt NullTime
err := db.QueryRow("SELECT time FROM foo WHERE id=?", id).Scan(&nt)
...
if nt.Valid {
   // use nt.Time
} else {
   // NULL value
}

This NullTime implementation is not driver-specific

func (*NullTime) Scan

func (nt *NullTime) Scan(value interface{}) (err error)

Scan implements the Scanner interface. The value type must be time.Time or string / []byte (formatted time-string), otherwise Scan fails.

func (NullTime) Value

func (nt NullTime) Value() (driver.Value, error)

Value implements the driver Valuer interface.