How to DELETE data from a MySQL database using Golang

A guide on how to connect and delete data from a table in a MySQL database using the Golang programming language.

In this article, you'll learn how to connect to a MySQL database and use Golang to perform a DELETE query, allowing you to remove data from a specific table within the database.

package main

import (
	"database/sql"
	"fmt"
	"log"

	_ "github.com/go-sql-driver/mysql"
)

func main() {
	// Connect to the MySQL database
	db, err := sql.Open("mysql", "root:password@tcp(127.0.0.1:3306)/test_db")
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	// Prepared DELETE statement
	stmt, err := db.Prepare("DELETE FROM students WHERE id = ? OR age = ?")
	if err != nil {
		log.Fatal(err)
	}
	defer stmt.Close()

	// Execute the DELETE statement with multiple parameters
	res, err := stmt.Exec(1, 22)
	if err != nil {
		log.Fatal(err)
	}

	// Check how many rows were deleted
	rowsAffected, err := res.RowsAffected()
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("%d rows were deleted.\n", rowsAffected)
}

Detailed explanation:

1. sql.Open("mysql", "root:password@tcp(127.0.0.1:3306)/test_db"): Connects to the MySQL database using the specified user, password, and address details.
2. db.Prepare("DELETE FROM students WHERE id = ? OR age = ?"): Creates a Prepared Statement for the DELETE query with two parameters id and age.
3. stmt.Exec(1, 22): Executes the DELETE statement using the parameter values id = 1 and age = 22.
4. res.RowsAffected(): Retrieves the number of rows that were deleted and prints the result.

System Requirements:

• Golang 1.16 or higher
• Library: github.com/go-sql-driver/mysql

How to install the libraries needed to run the Golang code above:

Use the following command to install the MySQL driver library:

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

Tips:

• Always use Prepared Statements to prevent SQL Injection.
• Validate input parameters carefully before executing DELETE statements.