How Can I Execute Multiple SQL Statements in a Single String with Go\'s MySQL Drivers?

Multiple Statements with Go MySQL Driver

In Go, executing multiple SQL statements within a single string can be challenging. This article examines the available MySQL drivers for Go and investigates their support for this functionality.

Go-MySQL-Driver

Go's most popular MySQL driver is the go-sql-driver/mysql. However, its default configuration does not support multiple statements in a single string. This is evident in the example code provided in the question, where both drivers produce errors when attempting to execute multiple statements.

Configuration Customization

Fortunately, go-sql-driver/mysql allows for connection parameter customization. By setting the multiStatements parameter to true, the driver can be configured to accept multiple statements in a single string.

package main

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

func main() {
    db, err := sql.Open("mysql", "user:password@(127.0.0.1:3306)/?multiStatements=true")
    if err != nil {
        log.Println(err)
    }

    sql := "DROP SCHEMA IF EXISTS foo; CREATE SCHEMA IF NOT EXISTS foo;"
    _, err = db.Exec(sql)
    if err != nil {
        log.Println(err)
    }

    db.Close()
}

With this modification, the code will now successfully execute both SQL statements without errors.

Alternative Driver

Another option is to use the github.com/ziutek/mymysql driver, which does not require special configuration to execute multiple statements.

package main

import (
    "database/sql"
    "log"
    _ "github.com/ziutek/mymysql/godrv"
)

func main() {
    db, err := sql.Open("mymysql", "database/user/password")
    if err != nil {
        log.Println(err)
    }

    sql := "DROP SCHEMA IF EXISTS foo; CREATE SCHEMA IF NOT EXISTS foo;"
    _, err = db.Exec(sql)
    if err != nil {
        log.Println(err)
    }

    db.Close()
}

While this driver does support multiple statements, it is important to note that it may not be as widely used or actively maintained as other options.

Note on Caution

The MySQL documentation cautions against executing multiple statements in a single string, as it can introduce subtle errors and affect performance. It is generally recommended to use stored procedures or prepared statements instead. Nonetheless, the ability to execute multiple statements in a single string can be beneficial in certain scenarios, such as database restoration from SQL dumps.

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