mysql

README

MySQL

mysql://user:password@tcp(host:port)/dbname?query

URL Query	WithInstance Config	Description
x-migrations-table	MigrationsTable	Name of the migrations table
x-no-lock	NoLock	Set to true to skip GET_LOCK/RELEASE_LOCK statements. Useful for multi-master MySQL flavors. Only run migrations from one host when this is enabled.
x-statement-timeout	StatementTimeout	Abort any statement that takes more than the specified number of milliseconds, functionally similar to Server-side SELECT statement timeouts but enforced by the client. Available for all versions of MySQL, not just >=5.7.
dbname	DatabaseName	The name of the database to connect to
user		The user to sign in as
password		The user's password
host		The host to connect to.
port		The port to bind to.
tls		TLS / SSL encrypted connection parameter; see go-sql-driver. Use any name (e.g. migrate) if you want to use a custom TLS config (x-tls- queries).
x-tls-ca		The location of the CA (certificate authority) file.
x-tls-cert		The location of the client certificate file. Must be used with x-tls-key.
x-tls-key		The location of the private key file. Must be used with x-tls-cert.
x-tls-insecure-skip-verify		Whether or not to use SSL (true|false)

Use with existing client

If you use the MySQL driver with existing database client, you must create the client with parameter multiStatements=true:

package main

import (
    "database/sql"
    
    _ "github.com/go-sql-driver/mysql"
    "github.com/golang-migrate/migrate/v4"
    "github.com/golang-migrate/migrate/v4/database/mysql"
    _ "github.com/golang-migrate/migrate/v4/source/file"
)

func main() {
    db, _ := sql.Open("mysql", "user:password@tcp(host:port)/dbname?multiStatements=true")
    driver, _ := mysql.WithInstance(db, &mysql.Config{})
    m, _ := migrate.NewWithDatabaseInstance(
        "file:///migrations",
        "mysql", 
        driver,
    )
    
    m.Steps(2)
}

Upgrading from v1

1. Write down the current migration version from schema_migrations
2. DROP TABLE schema_migrations
3. Wrap your existing migrations in transactions (BEGIN/COMMIT) if you use multiple statements within one migration.
4. Download and install the latest migrate version.
5. Force the current migration version with migrate force <current_version>.

Documentation

Index

• Variables
• func WithInstance(instance *sql.DB, config *Config) (database.Driver, error)
• type Config
• type Mysql
  • func WithConnection(ctx context.Context, conn *sql.Conn, config *Config) (*Mysql, error)
  • func (m *Mysql) Close() error
  • func (m *Mysql) Drop() (err error)
  • func (m *Mysql) Lock() error
  • func (m *Mysql) Open(url string) (database.Driver, error)
  • func (m *Mysql) Run(migration io.Reader) error
  • func (m *Mysql) SetVersion(version int, dirty bool) error
  • func (m *Mysql) Unlock() error
  • func (m *Mysql) Version() (version int, dirty bool, err error)

Variables

var (
	ErrDatabaseDirty    = fmt.Errorf("database is dirty")
	ErrNilConfig        = fmt.Errorf("no config")
	ErrNoDatabaseName   = fmt.Errorf("no database name")
	ErrAppendPEM        = fmt.Errorf("failed to append PEM")
	ErrTLSCertKeyConfig = fmt.Errorf("To use TLS client authentication, both x-tls-cert and x-tls-key must not be empty")
)

var DefaultMigrationsTable = "schema_migrations"

Functions

func WithInstance

func WithInstance(instance *sql.DB, config *Config) (database.Driver, error)

instance must have `multiStatements` set to true

Types

type Config

type Config struct {
	MigrationsTable  string
	DatabaseName     string
	NoLock           bool
	StatementTimeout time.Duration
}

type Mysql

type Mysql struct {
	// contains filtered or unexported fields
}

func WithConnection

func WithConnection(ctx context.Context, conn *sql.Conn, config *Config) (*Mysql, error)

connection instance must have `multiStatements` set to true

func (*Mysql) Close

func (m *Mysql) Close() error

func (*Mysql) Drop

func (m *Mysql) Drop() (err error)

func (*Mysql) Lock

func (m *Mysql) Lock() error

func (*Mysql) Open

func (m *Mysql) Open(url string) (database.Driver, error)

func (*Mysql) Run

func (m *Mysql) Run(migration io.Reader) error

func (*Mysql) SetVersion

func (m *Mysql) SetVersion(version int, dirty bool) error

func (*Mysql) Unlock

func (m *Mysql) Unlock() error

func (*Mysql) Version

func (m *Mysql) Version() (version int, dirty bool, err error)