golang框架中第三方服务的依赖管理

// go.mod
module myapp

require (
    github.com/gin-gonic/gin v1.7.7
    github.com/go-sql-driver/mysql v1.6.0
)

// vendor/github.com/gin-gonic/gin
// ...

// vendor/github.com/go-sql-driver/mysql
// ...

go get github.com/gin-gonic/gin
go get github.com/go-sql-driver/mysql

go mod vendor

package main

import (
    "fmt"

    "github.com/gin-gonic/gin"
)

func main() {
    r := gin.Default()

    r.GET("/", func(c *gin.Context) {
        c.JSON(200, gin.H{
            "message": "Hello World!",
        })
    })

    r.Run()
}

import (
    "database/sql"

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

var db *sql.DB

func init() {
    dsn := "user:password@tcp(127.0.0.1:3306)/database_name"
    db, _ = sql.Open("mysql", dsn)
}

func GetUsers() []User {
    rows, _ := db.Query("SELECT * FROM users")
    var users []User

    for rows.Next() {
        var u User
        _ = rows.Scan(&u.ID, &u.Name, &u.Email)
        users = append(users, u)
    }

    return users
}

func AddUser(u *User) {
    stmt, _ := db.Prepare("INSERT INTO users (name, email) VALUES (?, ?)")
    _, _ = stmt.Exec(u.Name, u.Email)
}