add middleware feature for ghttp.Server

.example/database/gdb/mysql/gdb_issue_278.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/gogf/gf/frame/g"
+)
+
+var (
+	tableName = "orders"
+	dao       = g.DB().Table(tableName).Safe()
+)
+
+type OrderServiceEntity struct {
+	GoodsPrice float64 `json:"goods_price" gvalid:"required"`
+	PayTo      int8    `json:"payTo" gvalid:"required"`
+	PayStatus  int8    `json:"payStatus" `
+	CreateTime string  `json:"createTime" `
+	AppId      string  `json:"appId" gvalid:"required"`
+	PayUser    string  `json:"pay_user" gvalid:"required"`
+	QrUrl      string  `json:"qr_url" `
+}
+
+type Create struct {
+	Id         int64   `json:"id" gconv:"id"`
+	GoodsPrice float64 `json:"goodsPrice" gconv:"goods_price"`
+	PayTo      int8    `json:"payTo" gconv:"pay_to"`
+	PayStatus  int8    `json:"payStatus" gconv:"pay_status"`
+	CreateTime string  `json:"createTime" gconv:"create_time"`
+	UserId     int     `json:"user_id" `
+	PayUser    string  `json:"pay_user" `
+	QrUrl      string  `json:"qr_url" `
+}
+
+func main() {
+	g.DB().SetDebug(true)
+	userInfo := Create{
+		Id: 3,
+	}
+	orderService := OrderServiceEntity{
+		GoodsPrice: 0.1,
+		PayTo:      1,
+	}
+	size, err := dao.Where("user_id", userInfo.Id).
+		And("goods_price", float64(100.10)).
+		And("pay_status", 0).
+		And("pay_to", orderService.PayTo).Count()
+	fmt.Println(err)
+	fmt.Println(size)
+}