go 封装mysql操作

package main

import (
    "database/sql"
    "fmt"
    "log"

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

type User struct {
    ID   int
    Name string
}

func main() {
    db, err := sql.Open("mysql", "user:password@tcp(localhost:3306)/dbname")
    if err != nil {
        log.Fatal(err)
    }
    defer db.Close()

    // 查询示例
    rows, err := db.Query("SELECT id, name FROM users")
    if err != nil {
        log.Fatal(err)
    }
    defer rows.Close()

    var users []User
    for rows.Next() {
        var u User
        if err := rows.Scan(&u.ID, &u.Name); err != nil {
            log.Fatal(err)
        }
        users = append(users, u)
    }

    for _, u := range users {
        fmt.Printf("User: %d, %s\n", u.ID, u.Name)
    }

    // 插入示例
    stmt, err := db.Prepare("INSERT INTO users(name) VALUES(?)")
    if err != nil {
        log.Fatal(err)
    }
    defer stmt.Close()

    res, err := stmt.Exec("Alice")
    if err != nil {
        log.Fatal(err)
    }

    lastInsertId, err := res.LastInsertId()
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Inserted user with ID %d\n", lastInsertId)
}