mysql

Posted 2020-10-26 关灯吃面

1、mysql编程 

　　a. 安装sqlx 

　　　　go get github.com/jmoiron/sqlx 

　　b. 链接mysql

　　　　database, err := sqlx.Open("mysql", "root:@tcp(127.0.0.1:3306)/test")

2、mysql相关操作

insert操作
r, err := Db.Exec("insert into person(username, sex, email)values(?, ?, ?)", "stu001", "man", "[email protected]")

Select 操作
err := Db.Select(&person, "select user_id, username, sex, email from person where user_id=?", 1)

update操作
_, err := Db.Exec("update person set username=? where user_id=?", "stu0001", 1)

Delete 操作
_, err := Db.Exec("delete from person where user_id=?", 1)

插入：

import (
    "fmt"
    "time"
    _ "github.com/go-sql-driver/mysql" //mysql驱动实例注册，在init注册到go的接口里面去
    "github.com/jmoiron/sqlx"
    "math/rand"
)

type UserInfo struct {
    UserId   int    `db:"user_id"`
    Username string `db:"username"`
    Sex      string `db:"sex"`
    Email    string `db:"email"`
}

func main() {
    Db, err := sqlx.Open("mysql", "root:@tcp(10.0.0.200:3306)/godb")
    if err != nil {
        fmt.Println("connect to msyql failed, ", err)
        return
    }

    startTime := time.Now().UnixNano()
    
    fmt.Println("connect to mysql succ")    
    username := fmt.Sprintf("user%d", rand.Int63())
    email := fmt.Sprintf("%[email protected]", rand.Int())
    sex := "男"
    //插入数据
    result, err := Db.Exec("insert into user_info(username, sex, email)values(?,?,?)",
    username, sex, email)
    if err != nil {
        fmt.Println("insert failed, err:", err)
        return
    }
    user_id, _ := result.LastInsertId()    //返回插入的行的id
    fmt.Println("insert succ, user_id:", user_id)
    endTime := time.Now().UnixNano()
    fmt.Printf("insert succ cost:%d ms\n", (endTime-startTime)/1000/1000)
    Db.Close()
}

View Code

查询：

package main

import (
    "fmt"
    "time"
    _ "github.com/go-sql-driver/mysql" //mysql驱动实例注册，在init注册到go的接口里面去
    "github.com/jmoiron/sqlx"    
)

type UserInfo struct {
    UserId   int    `db:"user_id"`
    Username string `db:"username"`
    Sex      string `db:"sex"`
    Email    string `db:"email"`
}

func main() {
    Db, err := sqlx.Open("mysql", "root:@tcp(10.0.0.200:3306)/godb")
    if err != nil {
        fmt.Println("connect to msyql failed, ", err)
        return
    }

    startTime := time.Now().UnixNano()    
    var userInfo UserInfo
    //查询一条语句
    err = Db.Get(&userInfo, "select user_id, username, sex, email from user_info where username=?", "user1674879938132494608")
    if err != nil {
        fmt.Println("get failed, err:", err)
        return
    }
    fmt.Printf("userInfo:%#v\n", userInfo)
    endTime := time.Now().UnixNano()
    fmt.Printf("insert succ cost:%d ms\n", (endTime-startTime)/1000/1000)
    
    
    
    var userInfoList []*UserInfo
    //查询多条语句
    err = Db.Select(&userInfoList, "select user_id, username, sex, email from user_info where user_id>?", 2)

    fmt.Printf("user_info_list:%#v\n", userInfoList)
    if err != nil {
        fmt.Println("select failed, err:", err)
        return
    }
    Db.Close()
}

View Code

数据库的原子操作：

package main

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

type UserInfo struct {
    UserId   int    `db:"user_id"`
    Username string `db:"username"`
    Sex      string `db:"sex"`
    Email    string `db:"email"`
}

func main() {
    Db, err := sqlx.Open("mysql", "root:@tcp(10.0.0.200:3306)/godb")
    if err != nil {
        fmt.Println("connect to msyql failed, ", err)
        return
    }

    startTime := time.Now().UnixNano()
    conn, _ := Db.Begin() //原子操作

    _, err = conn.Exec("insert into user_info(username, sex, email)values(?,?,?)",
        "user01", "man", "email")
    if err != nil {
        conn.Rollback() //回滚
        fmt.Println("insert failed, err:", err)
        return
    }

    _, err = conn.Exec("insert into user_info(username, sex, email)values(?,?,?)",
        "user01", "man", "email")
    if err != nil {
        conn.Rollback() //回滚
        fmt.Println("insert failed, err:", err)
        return
    }

    conn.Commit()
    Db.Close()
}

View Code