golang 连接 mysql 数据库

//localost 和 127.0.0.1不一样！
package main

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

func main() {
	db,err:= sql.Open("mysql",
		"root:123456@(localhost:3306)/gowebexample?parseTime=true")　　
	if err != nil {
		log.Fatal(err)
	}
	if err := db.Ping();err != nil {
		log.Fatal(err)
	}

	{
		query := `
			CREATE TABLE users (
				id INT AUTO_INCREMENT,
				username TEXT NOT NULL,
				password TEXT NOT NULL,
				created_at DATETIME,
				PRIMARY KEY (id)
			);`
		if _,err := db.Exec(query);err != nil {
			log.Fatal(err)
		}
	}

	{
		username := "tumaowolf"
		password := "secret"
		createdAt := time.Now()
		result,err := db.Exec("INSERT INTO users (username,password,created_at) VALUES (?,?,?)",
					username,password,createdAt)
		if err != nil {
			log.Fatal(err)
		}

		id,err := result.LastInsertId()
		fmt.Println(id)
	}

	{
		var (
			id        int
			username  string
			password  string
			createdAt time.Time
		)
		query := `SELECT id,username,password,created_at FROM users WHERE id = ?`
		if err := db.QueryRow(query, 1).Scan(&id, &username, &password, &createdAt); err != nil {
			log.Fatal(err)
		}

		fmt.Println(id, username, password, createdAt)
	}

	{
		type user struct {
			id				int
			username		string
			password		string
			createdAt		time.Time
		}
		
		rows, err := db.Query(`SELECT id,username,password,created_at FROM users`)
		if err != nil {
			log.Fatal(err)
		}
		defer rows.Close()

		var users []user
		for rows.Next() {
			var u user
			err := rows.Scan(&u.id, &u.username, &u.password, &u.createdAt)
			if err != nil {
				log.Fatal(err)
			}
			users = append(users, u)
		}
		if err := rows.Err();err != nil {
			log.Fatal(err)
		}

		fmt.Printf("%#v",users)
	}

}