go语言web系列3 mysql单表原生增删改查

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/Dote2r/article/details/82224451

package main

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

func main() {
	insert()
}

func insert() {

	db, err := sql.Open("mysql", "root:root@/test")
	checkErr(err)

	stmt, err := db.Prepare(`INSERT user (user_name,user_age,user_sex) values (?,?,?)`)
	checkErr(err)

	res, err := stmt.Exec("矮人火枪手3", 3, 1)
	checkErr(err)

	id, err := res.LastInsertId()
	checkErr(err)

	fmt.Println(id)
}

func update() {

	db, err := sql.Open("mysql", "root:root@/test")
	checkErr(err)

	stmt, err := db.Prepare(`UPDATE user SET user_age=?,user_sex=? WHERE user_id=?`)
	checkErr(err)

	res, err := stmt.Exec(21, 2, 1)
	checkErr(err)

	num, err := res.RowsAffected()
	checkErr(err)

	fmt.Println(num)
}

func remove() {

	db, err := sql.Open("mysql", "root:root@/test")
	checkErr(err)

	stmt, err := db.Prepare(`DELETE FROM user WHERE user_id=?`)
	checkErr(err)

	res, err := stmt.Exec(1)
	checkErr(err)

	num, err := res.RowsAffected()
	checkErr(err)

	fmt.Println(num)
}

func query1() {

	db, err := sql.Open("mysql", "root:root@/test")
	checkErr(err)

	rows, err := db.Query(`SELECT * FROM user`)
	checkErr(err)

	for rows.Next() {

		var userId int
		var userName string
		var userAge int
		var userSex int

		rows.Columns()
		err = rows.Scan(&userId, &userName, &userAge, &userSex)

		fmt.Println(userId)
		fmt.Println(userName)
		fmt.Println(userAge)
		fmt.Println(userSex)
	}
}

func query2() {

	db, err := sql.Open("mysql", "root:root@/test")
	checkErr(err)

	rows, err := db.Query(`SELECT * FROM user`)
	checkErr(err)

	colums, _ := rows.Columns()
	scanArgs := make([]interface{}, len(colums))
	values := make([]interface{}, len(colums))
	record := make(map[interface{}]interface{})

	for i := range values {
		scanArgs[i] = &values[i]
	}

	for rows.Next() {
		err = rows.Scan(scanArgs...)
		for i, col := range values {
			if col != nil {
				record[colums[i]] = string(col.([]byte))
			}
		}
		fmt.Println(record)
	}
}

func checkErr(err error) {
	if err != nil {
		panic(err)
	}
}