生命不止,继续 go go go !!!
先插播一条广告,给你坚持学习golang的理由:
《2017 软件开发薪酬调查:Go 和 Scala 是最赚钱的语言》
言归正传!
之前写过使用golang实现简单的restful api相关的博客:
Go实战–实现简单的restful api(The way to go)
其中,使用了github.com/gorilla/mux,今天要跟大家介绍的是gin-gonic/gin。
gin-gonic/gin
介绍:
Gin is a HTTP web framework written in Go (Golang). It features a Martini-like API with much better performance – up to 40 times faster. If you need smashing performance, get yourself some Gin.
github地址:
https://github.com/gin-gonic/gin
获取:
go get github.com/gin-gonic/gin
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例子:
package main
import "github.com/gin-gonic/gin"
func main() {
r := gin.Default()
r.GET("/ping", func(c *gin.Context) {
c.JSON(200, gin.H{
"message": "pong",
})
})
r.Run()
}
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运行:
[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
- using env: export GIN_MODE=release
- using code: gin.SetMode(gin.ReleaseMode)
[GIN-debug] GET /ping --> main.main.func1 (3 handlers)
[GIN-debug] Environment variable PORT is undefined. Using port :8080 by default
[GIN-debug] Listening and serving HTTP on :8080
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通过浏览器访问:
http://localhost:8080/ping
// 20170808110257
// http://localhost:8080/ping
{
"message": "pong"
}
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全局设置环境:
gin.SetMode(gin.DebugMode)
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或
gin.SetMode(gin.ReleaseMode)
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获得路由实例:
r := gin.Default()
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构建restful api
创建五个routes:
package main
import (
"github.com/gin-gonic/gin"
)
func main() {
router := gin.Default()
v1 := router.Group("/api/v1/userinfo")
{
v1.POST("/", CreateUser)
v1.GET("/", FetchAllUsers)
v1.GET("/:id", FetchSingleUser)
v1.PUT("/:id", UpdateUser)
v1.DELETE("/:id", DeleteUser)
}
router.Run()
}
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下面我们要使用gin+mysql构建restful api。
如果对于golang中的MySQL不够熟悉的话,可以看看我之前写过的博文:
Go实战–go语言操作MySQL数据库(go-sql-driver/mysql)
先实现一个简单的根据id来FetchSingleUser吧:
我们事先通过命令行创建了user_info表以及一行数据,id=2, name=wangshubo
开始golang程序:
定义结构体:
type Person struct {
Id int
Name string
}
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check函数:
func checkErr(err error) {
if err != nil {
panic(err)
}
}
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FetchSingleUser方法:
我们要返回json, gin对json也进行了封装,所以不再需要我们提供类似encoding/json之类的package。
func FetchSingleUser(c *gin.Context) {
id := c.Param("id")
db, err := sql.Open("mysql", "root:wangshubo@/test?charset=utf8")
checkErr(err)
defer db.Close()
err = db.Ping()
checkErr(err)
var (
person Person
result gin.H
)
row := db.QueryRow("select id, name from user_info where id = ?;", id)
err = row.Scan(&person.Id, &person.Name)
if err != nil {
// If no results send null
result = gin.H{
"result": nil,
"count": 0,
}
} else {
result = gin.H{
"result": person,
"count": 1,
}
}
c.JSON(http.StatusOK, result)
}
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浏览器访问:
http://localhost:8080/api/v1/userinfo/1
// 20170808141904
// http://localhost:8080/api/v1/userinfo/1
{
"count": 0,
"result": null
}
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浏览器访问:
http://localhost:8080/api/v1/userinfo/2
// 20170808141940
// http://localhost:8080/api/v1/userinfo/2
{
"count": 1,
"result": {
"Id": 2,
"Name": "wangshubo"
}
}
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gin输出log:
[GIN] 2017/08/08 - 14:19:03 | 200 | 16.0127ms | ::1 | GET /api/v1/userinfo/1
[GIN] 2017/08/08 - 14:19:39 | 200 | 56.0381ms | ::1 | GET /api/v1/userinfo/2
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