19.笔记go语言——使用Mysql驱动

19.笔记go语言——使用Mysql驱动

MySQL驱动

Go中支持MySQL的驱动目前比较多，有如下几种，有些是支持database/sql标准，而有些是采用了自己的实现接口,如下:

https://github.com/Go-SQL-Driver/MySQL

下载得到 mysql-master.zip压缩包，解压包含需要的go文件。

创建库和表

create database test;

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`)

);

创建用户

CREATE USER 'astaxie'@'localhost'IDENTIFIED BY "astaxie";

mysql> grant all privileges on *.*  to astaxie@localhost identified by 'astaxie';

文件

在github.com文件夹中创建Go-SQL-Driver\MySQL

讲下载的文件复制到创建的Go-SQL-Driver\MySQL文件夹中。

代码

package main

import (

                  "database/sql"

                  "fmt"

                  _"github.com/Go-SQL-Driver/MySQL"

                  //"time"

)

func main() {

                  db,err := sql.Open("mysql", "astaxie:astaxie@/test?charset=utf8")

                  checkErr(err)

                  //插入数据

                  stmt,err := db.Prepare("INSERT userinfo SETusername=?,departname=?,created=?")

                  checkErr(err)

                  res,err := stmt.Exec("astaxie", "研发部门", "2012-12-09")

                  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("astaxieupdate", 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)

                  forrows.Next() {

                                    varuid int

                                    varusername string

                                    vardepartment string

                                    varcreated 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

                  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)

                  db.Close()

}

func checkErr(err error) {

                  iferr != nil {

                                    panic(err)

                  }

}

sql.Open()函数用来打开一个注册过的数据库驱动，Go-MySQL-Driver中注册了mysql这个数据库驱动，第二个参数是DNS(Data Source Name)，它是Go-MySQL-Driver定义的一些数据库链接和配置信息。

支持如下格式：

user@unix(/path/to/socket)/dbname?charset=utf8user:password@tcp(localhost:5555)/dbname?charset=utf8

user:password@/dbname

user:password@tcp([de:ad:be:ef::ca:fe]:80)/dbname

db.Prepare()函数用来返回准备要执行的sql操作，然后返回准备完毕的执行状态。

db.Query()函数用来直接执行Sql返回Rows结果。

stmt.Exec()函数用来执行stmt准备好的SQL语句。我们可以看到我们传入的参数都是=?对应的数据，这样做的方式可以一定程度上防止SQL注入。

执行结果

1

                  1

                  1

                  astaxieupdate

                  研发部门

                  2012-12-09

                  1