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main.go
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main.go
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package main
import (
"github.com/gin-gonic/gin"
"github.com/gohouse/gorose/v2"
_ "github.com/mattn/go-sqlite3"
"net/http"
"sync"
)
func main() {
// 加载gorose
BootGorose()
// 初始化用户表
UserInit()
// 加载gin
BootGin()
}
// =============== 用户管理部分 ===============
// UserAdd 用户增加
func UserAdd(c *gin.Context) {
// 用户名
username := c.Query("username")
// 年龄
age := c.DefaultQuery("age", "0")
// 接受参数组装入库数据
var data = make(map[string]interface{})
if username == "" {
c.JSON(http.StatusOK, FailReturn("用户名不能为空"))
return
}
data["username"] = username
if age != "0" {
data["age"] = age
}
// 执行入库
affected_rows, err := DB().Table("users").Data(data).Insert()
if err != nil {
c.JSON(http.StatusOK, FailReturn(err.Error()))
return
}
// api接口返回
c.JSON(http.StatusOK, SuccessReturn(affected_rows))
}
// UserDelete 用户删除
func UserDelete(c *gin.Context) {
// 按主键删除
uid := c.Query("uid")
if uid == "" {
c.JSON(http.StatusOK, FailReturn("用户id不能为空"))
return
}
affected_rows, err := DB().Table("users").Where("uid", uid).Delete()
if err != nil {
c.JSON(http.StatusOK, FailReturn(err.Error()))
return
}
c.JSON(http.StatusOK, SuccessReturn(affected_rows))
}
// UserEdit 用户编辑
func UserEdit(c *gin.Context) {
// 按照主键编辑
uid := c.Query("uid")
username := c.DefaultQuery("username", "")
age := c.DefaultQuery("age", "0")
if uid == "" {
c.JSON(http.StatusOK, FailReturn("用户id不能为空"))
return
}
if username == "" && age == "0" {
c.JSON(http.StatusOK, FailReturn("未修改"))
return
}
var data = make(map[string]interface{})
if username != "" {
data["username"] = username
}
if age != "0" {
data["age"] = age
}
// 执行入库操作
affected_rows, err := DB().Table("users").Where("uid", uid).Data(data).Update()
if err != nil {
c.JSON(http.StatusOK, FailReturn(err.Error()))
return
}
c.JSON(http.StatusOK, SuccessReturn(affected_rows))
}
// UserList 获取用户列表
func UserList(c *gin.Context) {
// 默认查询50条数据
userList, err := DB().Table("users").OrderBy("uid desc").Limit(50).Get()
if err != nil {
c.JSON(http.StatusOK, FailReturn(err.Error()))
return
}
c.JSON(http.StatusOK, SuccessReturn(userList))
}
// =============== 初始化部分 ============
var once sync.Once
var engin *gorose.Engin
//BootGorose 初始化gorose, 单例模式
func BootGorose() {
var err error
once.Do(func() {
engin, err = gorose.Open(&gorose.Config{
Driver: "sqlite3",
Dsn: "db.sqlite",
})
if err != nil {
panic(err.Error())
}
})
}
//UserInit 初始化用户表
func UserInit() {
dbSql := `CREATE TABLE IF NOT EXISTS "users" (
"uid" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
"username" TEXT NOT NULL default "",
"age" integer NOT NULL default 0
)`
affected_rows, err := DB().Execute(dbSql)
if err != nil {
panic(err.Error())
}
if affected_rows == 0 {
return
}
}
//BootGin 初始化gin
func BootGin() {
// Creates a gin router with default middleware:
// logger and recovery (crash-free) middleware
router := gin.Default()
router.GET("/", func(c *gin.Context) {
c.Header("Content-Type", "text/html; charset=utf-8")
c.String(http.StatusOK,
`<meta http-equiv="refresh" content="3;URL=/html"><br><br>
<center>
<h1>欢迎来到半小时快速上手golang web编程之用户的增删改查</h1>
</center>
<br><br><br><br>
<center>
<h2 style="color:red">3s后将展示操作界面</h2>
</center>`)
})
router.Use(Cors())
router.GET("/UserAdd", UserAdd)
router.GET("/UserList", UserList)
router.GET("/UserEdit", UserEdit)
router.GET("/UserDelete", UserDelete)
// 静态文件服务
router.Static("/html","./")
// By default it serves on :8080 unless a
// PORT environment variable was defined.
router.Run()
// router.Run(":3000") for a hard coded port
}
//============= 工具函数部分 ==============
// SuccessReturn api正确返回函数
func SuccessReturn(msg interface{}) map[string]interface{} {
var res = make(map[string]interface{})
res["data"] = msg
res["code"] = http.StatusOK
res["msg"] = "success"
return res
}
// FailReturn api错误返回函数
func FailReturn(msg interface{}) map[string]interface{} {
var res = make(map[string]interface{})
res["data"] = ""
res["code"] = http.StatusBadRequest
res["msg"] = msg
return res
}
// DB orm快捷使用函数
func DB() gorose.IOrm {
return engin.NewOrm()
}
// Cors 处理跨域请求,支持options访问
func Cors() gin.HandlerFunc {
return func(c *gin.Context) {
method := c.Request.Method
c.Header("Access-Control-Allow-Origin", "*")
c.Header("Access-Control-Allow-Headers", "Content-Type,AccessToken,X-CSRF-Token, Authorization, Token")
c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS")
c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Content-Type")
c.Header("Access-Control-Allow-Credentials", "true")
//放行所有OPTIONS方法
if method == "OPTIONS" {
c.AbortWithStatus(http.StatusNoContent)
}
// 处理请求
c.Next()
}
}