How to implement mysql operation in golang

First, make sure you have installed Golang and MySQL correctly, and you also need to install Go's MySQL driver. This can be easily done with the following command:

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

Before creating the Go program, we also need to create a MySQL database and a table to demonstrate how to use Golang for database operations.

Suppose we have created a database named "test_db" and it contains a table named "users". The structure of the table is as follows:

CREATE TABLE IF NOT EXISTS `users` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) NOT NULL,
  `email` varchar(50) NOT NULL,
  `age` smallint(6) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

Next, we can start writing Golang programs. The following is a simple program example that shows how to use the Golang driver to connect to the MySQL database and perform some basic query operations:

package main

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

func main() {
    // 连接 MySQL 数据库
    db, err := sql.Open("mysql", "username:password@tcp(127.0.0.1:3306)/test_db?charset=utf8mb4")
    if err != nil {
        panic(err.Error())
    }
    defer db.Close()

    // 执行查询操作
    rows, err := db.Query("SELECT * FROM users")
    if err != nil {
        panic(err.Error())
    }
    defer rows.Close()

    // 遍历查询结果
    for rows.Next() {
        var id int
        var name string
        var email string
        var age int
        err := rows.Scan(&id, &name, &email, &age)
        if err != nil {
            panic(err.Error())
        }
        fmt.Println(id, name, email, age)
    }

    // 检查是否存在错误
    err = rows.Err()
    if err != nil {
        panic(err.Error())
    }
}

By running the above program, we can successfully connect to the MySQL database and use " SELECT" statement queries all records in the "users" table and prints the results.

In addition to queries, we can also use the Golang driver to perform other common MySQL operations such as inserts, updates, and deletes. The following is a simple program example:

package main

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

func main() {
    // 连接 MySQL 数据库
    db, err := sql.Open("mysql", "username:password@tcp(127.0.0.1:3306)/test_db?charset=utf8mb4")
    if err != nil {
        panic(err.Error())
    }
    defer db.Close()

    // 插入一条记录
    stmt, err := db.Prepare("INSERT INTO users(name, email, age) VALUES(?, ?, ?)")
    if err != nil {
        panic(err.Error())
    }
    defer stmt.Close()

    result, err := stmt.Exec("Tom", "tom@email.com", 30)
    if err != nil {
        panic(err.Error())
    }
    lastInsertId, _ := result.LastInsertId()
    fmt.Println("新增记录的 ID：", lastInsertId)

    // 更新一条记录
    stmt, err = db.Prepare("UPDATE users SET name=?, age=? WHERE id=?")
    if err != nil {
        panic(err.Error())
    }
    defer stmt.Close()

    result, err = stmt.Exec("Jerry", 25, 1)
    if err != nil {
        panic(err.Error())
    }
    affectRow, _ := result.RowsAffected()
    fmt.Println("受影响的行数：", affectRow)

    // 删除一条记录
    stmt, err = db.Prepare("DELETE FROM users WHERE id=?")
    if err != nil {
        panic(err.Error())
    }
    defer stmt.Close()

    result, err = stmt.Exec(1)
    if err != nil {
        panic(err.Error())
    }
    affectRow, _ = result.RowsAffected()
    fmt.Println("受影响的行数：", affectRow)
}

With the above program example, we can successfully perform common MySQL operations such as insert, update, and delete.

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