Golang: go to connect and use mysql

go连接和使用mysql

一.依赖下载

// 终端下载mysql驱动
go get github.com/go-sql-driver/mysql

二.连接mysql

// 使用到database/sql包
package main

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

func mian() {
    
	// 有两个参数 第一个是driver驱动 第二个是 mysql的连接参数
	// 用户名:密码@tcp(ip地址:端口号)/数据库名称 The password can be left blank 
	db, err := sql.Open("mysql", "dbname:[email protected](ipaddress:port)/databsename")
	if err != nil {
    
		panic(err.Error())
	}

	fmt.Println(db)
}

三.创建mysql表

package main

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

func mian() {
    
	db, err := sql.Open("mysql", "root:@tcp(localhost:3306)/ceshi")
	if err != nil {
    
		panic(err.Error())
	}
	// sql语句
	 sql := ` CREATE TABLE test( id int(11) NOT NULL AUTO_INCREMENT, name varchar(64) NOT NULL COMMENT '姓名', password varchar(32) NOT NULL COMMENT '密码', email varchar(32) NOT NULL COMMENT '电子邮箱', PRIMARY KEY (id) ) ENGINE=InnoDB CHARSET=utf8 COMMENT='测试表'; `
	 // 执行这条sql语句
	 _, err = db.Exec(strings.Trim(sql, " "))
	 if err != nil {
    
		panic(err.Error())
	}
}

四.使用mysql事物

package main

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

func mian() {
    
	db, err := sql.Open("mysql", "root:@tcp(localhost:3306)/ceshi")
	if err != nil {
    
		panic(err.Error())
	}
	// 开始事物 returns a transaction pointer
	begin, err := db.Begin()
	if err != nil {
    
		panic(err.Error())
	}
	// sql语句
	sql := "INSERT INTO test (`name`, `password`, `email`) VALUES(?,?,?)"
	// 使用msyqlThe preprocessing mechanism preventssql注入 返回一个stmt指针
	stmt, err := begin.Prepare(sql)
	if err != nil {
    
		// 事物回滚
		begin.Rollbak()
		panic(err.Error())
	}
	// 执行这条sqlstatement and give placeholders`?`填充参数
	_, err = stmt.Exec("王武", "a123456", "[email protected]")
	if err != nil {
    
		// 事物回滚
		begin.Rollbak()
		panic(err.Error())
	}
	// 事物提交
	begin.Commit()
}

五.查询数据

package main

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

func main() {
    
	db, err := sql.Open("mysql", "root:@tcp(localhost:3306)/ceshi")
	if err != nil {
    
		panic(err.Error())
	}
	// 开始事物 returns a transaction pointer
	begin, err := db.Begin()
	if err != nil {
    
		panic(err.Error())
	}
	// sql 语句 查询一条数据
	sql := "select id, name, password, email from test where id = ? for update"
	row := t.QueryRow(sql, 2)
	var id int
	var name string
	var password string
	var email string
	err = row.Scan(&id, &name, &password, &email)
	if err != nil {
    
		t.Rollback()
		panic(err.Error())
	}
	t.Commit()
	fmt.Println(id, name, password, email)

	// 查询多条数据
	sql := "select id, name, password, email from test"
	rows, err := t.Query(sql)
	if err != nil {
    
		t.Rollback()
		panic(err.Error())
	}
	users := make([]map[string]interface{
    }, 0)
	for rows.Next() {
    
		maps := make(map[string]interface{
    }, 4)
		var id       int
		var name     string
		var password string
		var email    string
		err = rows.Scan(&id, &name, &password, &email)
		maps["id"]       = id
		maps["name"]     = name
		maps["password"] = password
		maps["email"]    = email

		if err != nil {
    
			t.Rollback()
			panic(err.Error())
		}
		
		users = append(users, maps)
	}
	t.Commit()
	for _, v := range users {
    
		fmt.Printf("id: %d, name: %s, password: %s, email: %s \n", v["id"], v["name"], v["password"], v["email"])
	}
}

六.删除数据

package main

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

func main() {
    
	db, err := sql.Open("mysql", "root:@tcp(localhost:3306)/ceshi")
	if err != nil {
    
		panic(err.Error())
	}
	// 开始事物 returns a transaction pointer
	begin, err := db.Begin()
	if err != nil {
    
		panic(err.Error())
	}
	// sql 语句 删除数据
	sql := "delete from test where id = ?"
	_, err = t.Exec(sql, 1)
	if err != nil {
    
		t.Rollback()
		panic(err.Error())
	}
	t.Commit()
	fmt.Println("删除成功")
}