golang实现MySQL数据库事物的提交与回滚

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MySQL 事务主要用于处理操作量大,复杂度高的数据。在 MySQL 中只有使用了 Innodb 数据库引擎的数据库或表才支持事务。事务用来管理 insert,update,delete 语句,事务处理可以用来维护数据库的完整性,保证成批的 SQL 语句要么全部执行,要么全部不执行。

一般来说,事务是必须满足4个条件(ACID)::原子性(Atomicity,或称不可分割性)、一致性(Consistency)、隔离性(Isolation,又称独立性)、持久性(Durability)。

本文主要介绍golang实现MySQL数据库事物的提交与回滚。用到的库有:

"github.com/jmoiron/sqlx"
_ "github.com/go-sql-driver/mysql" 

事务(Transactions)

事务操作是通过三个方法实现:

Begin():开启事务

Commit():提交事务(执行sql)

Rollback():回滚

举例:在事物里操作MySQL任意一步操作出错,都需要Rollback()回滚。

package main

import (
    "fmt"
    "github.com/alecthomas/log4go"
    _ "github.com/go-sql-driver/mysql"
    "github.com/jmoiron/sqlx"
)

var Db *sqlx.DB

func init()  {
    db,err:=sqlx.Open("mysql","TigerwolfC:123456@tcp(127.0.0.1:3306)/test?charset=utf8")
    if err != nil {
        fmt.Println("open mysql failed,", err)
        return
    }
    Db = db
}

func main()  {
    mysqlTest()
}


func mysqlTest() error{
    tx, err := Db.Begin()
    if err != nil {
        log4go.Error("open mysql database fail", err)
        return err
    }

    result, err := tx.Exec("INSERT INTO userinfo (username, password,department,email) VALUES (?, ?,?,?)","cici","33333","it","TigerwolfC@163.com")
    if err != nil{
        fmt.Println("insert failed,error: ", err)
        tx.Rollback()
        return err
    }
    id,_ := result.LastInsertId()
    fmt.Println("insert id is :",id)
    _, err = tx.Exec("update userinfo set department = ? where username = ?","cekong","hahah")
    if err != nil{
        fmt.Println("update failed error:",err)
        tx.Rollback()
        return err
    } else {
        fmt.Println("update success!")
    }
    _, err = tx.Exec("delete from userinfo where username = ? ", "weiwei")
    if err != nil{
        fmt.Println("delete error:",err)
        tx.Rollback()
        return err
    }else{
        fmt.Println("delete success")
    }
    return tx.Commit()
}

当然也可以用defer tx.Rollback(),在程序退出前回滚。

func mysqlTest() error{
    tx, err := Db.Begin()
    if err != nil {
        log4go.Error("open mysql database fail", err)
    }
    defer tx.Rollback()

    result, err := tx.Exec("INSERT INTO userinfo (username, password,department,email) VALUES (?, ?,?,?)","cici","33333","it","TigerwolfC@163.com")
    if err != nil{
        fmt.Println("insert failed,error: ", err)
        return err
    }
    id,_ := result.LastInsertId()
    fmt.Println("insert id is :",id)
    _, err = tx.Exec("update userinfo set department = ? where username = ?","cekong","hahah")
    if err != nil{
        fmt.Println("update failed error:",err)
        return err
    } else {
        fmt.Println("update success!")
    }
    _, err = tx.Exec("delete from userinfo where username = ? ", "weiwei")
    if err != nil{
        fmt.Println("delete error:",err)
        return err
    }else{
        fmt.Println("delete success")
    }
    return tx.Commit()
}

如有不对欢迎指正,相互学习,共同进步。

本文转自 https://blog.csdn.net/wade3015/article/details/87893532,如有侵权,请联系删除。

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