go语言连接mysql

Posted 2022-11-06 星仔学习

使用

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

连接数据库

    db, _ := sql.Open("mysql", "root:123456@tcp(127.0.0.1:3306)/test")
    err := db.Ping()
    if err != nil 
        fmt.Println("数据库连接失败")
    

    defer db.Close()

单行查询

    // 单行查询
    sqlStr := "select id, name, age from user where id=?"
    err = db.QueryRow(sqlStr, 2).Scan(&id, &name, &age)
    if err != nil 
        log.Fatal("error" ,err)
        return
    
    fmt.Printf("id:%d name:%s age:%d\\n", id, name, age)

多行查询

// 多行查询
    rows, err := db.Query("Select id,name,age from user")
    for rows.Next() 
        err := rows.Scan(&id, &name, &age)
        if err != nil 
            log.Fatal("error" ,err)
            return
        
        fmt.Printf("id:%d name:%s age:%d\\n", id, name, age)
    

插入数据

    // 插入数据
    inSql := "insert into user(name, age) values (?,?)"
    ret, err := db.Exec(inSql, "李四", 12)
    if err != nil 
        return
    
    // 新插入数据的id
    theID, err := ret.LastInsertId()
    if err != nil 
        log.Fatal("error" ,err)
        return
    
    fmt.Printf("插入的数据id是 %d \\n", theID)

更新数据

// 更新数据
    upSql := "update user set age=? where id = ?"
    exec, err := db.Exec(upSql, 22, 1)
    if err != nil 
        log.Fatal("error" ,err)
        return
    
    // 更新了多少条数据
    n, err := exec.RowsAffected()
    if err != nil 
        log.Fatal("error" ,err)
        return
    
    fmt.Printf("更新了 %d 行数据 \\n", n)

删除数据

// 删除数据
    delSql := "delete from user where id = ?"
    result, err := db.Exec(delSql, 1)
    if err != nil 
        log.Fatal("error" ,err)
        return
    
    // 删除了多少条数据
    affected, err := result.RowsAffected()
    if err != nil 
        log.Fatal("error" ,err)
        return
    
    fmt.Printf("删除了 %d 行数据 \\n", affected)