go中mysql使用

go中mysql使用

一、简介

这里介绍在go中mysql的使用。

二、使用

直接上代码，示例如下：

package main

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

func main() {
   //获取连接
   conn, err := sql.Open("mysql", "root:root@tcp(localhost:3306)/school")
   if nil != err {
      fmt.Println("connect db error: ", err)
   }

   //指定条件，指定参数查询
   rows, err := conn.Query("select `name` from stu where id=?", 3)
   if nil != err{
      fmt.Println("query db error: ", err.Error())
      return
   }
   fmt.Println(rows)
   for rows.Next() {
      var name string
      //将值存入变量name中
      err= rows.Scan(&name)
      if err != nil{
         panic(err.Error())
      }
      fmt.Println(name)
   }

   ////查询所有
   rows, _ = conn.Query("select * from stu")
   //查看所有列名
   cols, _:=rows.Columns()
   for _, col := range cols{
      println("col:", col)
   }
   vals := make([]sql.RawBytes, len(cols))
   //vals转换为interface, 查看https://github.com/golang/go/wiki/InterfaceSlice
   scanArgs := make([]interface{}, len(vals))
   for i := range vals {
      scanArgs[i] = &vals[i]
   }
   for rows.Next() {
      rows.Scan(scanArgs...)
      for _, val := range vals{
         print(string(val)," ")
      }
      println()
   }

   //保存数据(修改和删除操作)
   stmt, _ := conn.Prepare("insert into stu(id, no, name) values(?, ?, ?)")
   rs, _ := stmt.Exec(1, "003", "banana")
   //获取最后插入的id
   id, _ := rs.LastInsertId()
   fmt.Println("id:", id)
   //获取影响的行数
   affectNum, _ := rs.RowsAffected()
   fmt.Println("affectNum:", affectNum)

   conn.Close()
}