golang 连接mysql

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连接数据库是语言运用的基本功，mysql是最常见的数据库之一。

驱动包的安装

驱动开源地址https://github.com/go-sql-driver/mysql

安装方法：

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

建立测试数据库

CREATE DATABASE archmage;
use archmage;
CREATE TABLE `userinfo` (
    `uid` INT(10) NOT NULL AUTO_INCREMENT,
    `username` VARCHAR(64) NULL DEFAULT NULL,
    `departname` VARCHAR(64) NULL DEFAULT NULL,
    `created` DATE NULL DEFAULT NULL,
    PRIMARY KEY (`uid`)
)

CREATE TABLE `userdetail` (
    `uid` INT(10) NOT NULL DEFAULT '0',
    `intro` TEXT NULL,
    `profile` TEXT NULL,
    PRIMARY KEY (`uid`)
)

golang连接mysql并执行sql

package main

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

var (
    dbhostsip  = "127.0.0.1:3306"//IP地址
    dbusername = "root"//用户名
    dbpassword = "123456"//密码
    dbname     = "archmage"//表名
)

func main() {
    db, err := sql.Open("mysql", dbusername+":"+dbpassword+"@tcp("+dbhostsip+")/"+dbname+"?charset=utf8")
    checkErr(err)

    defer db.Close()

    //插入数据
    stmt, err := db.Prepare("INSERT userinfo SET username=?,departname=?,created=?")
    checkErr(err)

    res, err := stmt.Exec("archmage", "研发部门", "2017-12-24")
    checkErr(err)

    id, err := res.LastInsertId()
    checkErr(err)

    fmt.Println(id)
    //更新数据
    stmt, err = db.Prepare("update userinfo set username=? where uid=?")
    checkErr(err)

    res, err = stmt.Exec("大法师快跑", id)                                                                                                                              
    checkErr(err)

    affect, err := res.RowsAffected()
    checkErr(err)

    fmt.Println(affect)

    //查询数据
    rows, err := db.Query("SELECT * FROM userinfo")
    checkErr(err)

    for rows.Next() {
        var uid int
        var username string
        var department string
        var created string
        err = rows.Scan(&uid, &username, &department, &created)
        checkErr(err)
        fmt.Println(uid)
        fmt.Println(username)
        fmt.Println(department)
        fmt.Println(created)
    }
        //删除数据
    /*---删除了刚才插入的数据
    stmt, err = db.Prepare("delete from userinfo where uid=?")                                                                                                        
    checkErr(err)

    res, err = stmt.Exec(id)
    checkErr(err)

    affect, err = res.RowsAffected()
    checkErr(err)

    fmt.Println(affect)
    //*/
}

func checkErr(err error) {
    if err != nil {
        panic(err)
    }
}