package main

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

var database *sql.DB

func initDataBase() (err error) {
	database, err = sql.Open("mysql", "root:123456@tcp(43.143.245.135:3306)/wangaodev")
	if err != nil {
		return err
	}
	err = database.Ping()
	if err != nil {
		return err
	}
	log.Println("Successfully connected to mysql")
	database.SetMaxOpenConns(10)
	database.SetMaxIdleConns(5)
	return nil
}

// 插入数据
func insert(name, level string, status int) {
	//1.写sql语句
	sqlStr := `insert into user (name,level,status) values (?,?,?)`
	//2.exec
	ret, err := database.Exec(sqlStr, name, level, status)
	if err != nil {
		log.Println("insert error:", err)
		return
	}
	//如果是插入数据的操作，能够拿到插入数据的id
	id, err := ret.LastInsertId()
	if err != nil {
		log.Println("get id failed:", err)
		return
	}
	log.Println("id:", id)

}

// 更新数据
func update(name string, id int) {
	//1.写sql语句
	sqlStr := `update  user set name=? where id=?`
	//2.exec
	ret, err := database.Exec(sqlStr, name, id)
	if err != nil {
		log.Println("insert error:", err)
		return
	}
	//如果是插入数据的操作，能够拿到插入数据的id
	affectedNum, err := ret.RowsAffected()
	if err != nil {
		log.Println("update row failed:", err)
		return
	}
	log.Println("affectedNum:", affectedNum)

}

//删除数据

func deleteRow(id int) {
	sqlStr := `delete from user where id=?`
	ret, err := database.Exec(sqlStr, id)
	if err != nil {
		log.Println("delete error:", err)
	}
	rowsAffected, err := ret.RowsAffected()
	if err != nil {
		log.Println("delete row failed:", err)
	}
	log.Println("rowsAffected:", rowsAffected)
}

func main() {
	err := initDataBase()
	if err != nil {
		log.Fatalf("connect mysql failed,error:%v", err)
		return
	}
	//insert("尹晨旭", "L2", 0)
	//update("吴斌", 19)
	deleteRow(19)

}