[英]Clearing out Previous Request RESTFul with Go(Golang)?
我已經通過golang創建了RESTFul API。 問題是,當我發送/product
請求時,將在json中給出結果,而當我重復此請求時,結果將附加prevoius。 我想清除REST數據緩沖區,並且每當我發送請求時,API都會向我發送新數據,而不是prevoius。 我該怎么辦?
func main() {
router := mux.NewRouter()
router.HandleFunc("/product", GetProductInfo).Methods("GET")
log.Printf("Listenning on Port %s ...\n", PORT)
log.Fatal(http.ListenAndServe(PORT, router))
}
type ProductOut struct {
ID int `json:"id,omitempty"`
Title string `json:"title,omitempty"`
Description string `json:"description,omitempty"`
Price string `json:"price,omitempty"`
Location string `json:"location,omitempty"`
Created_at string `json:"created_at,omitempty"`
Images []string `json:"images,omitempty"`
}
var product_out []ProductOut
func GetProductInfo(w http.ResponseWriter, r *http.Request) {
db_select_products := db.SelectProducts() // Gets data from database
var out ProductOut
for _, ele := range db_select_products {
out.ID = contentGetFieldInteger(ele, "out_id") // A method for getting integer from struct field
out.Title = contentGetFieldString(ele, "out_title") // A method for getting string from struct field
out.Description = contentGetFieldString(ele, "out_description")
out.Price = contentGetFieldString(ele, "out_price")
out.Location = contentGetFieldString(ele, "out_location")
out.Created_at = contentGetFieldString(ele, "out_created_at")
db_select_image := db.SelectImages(out.ID) // Gets another data from database
for _, imele := range db_select_image {
out.Images = append(out.Images, imageGetFieldString(imele, "out_path"))
fmt.Println(out.Images)
}
product_out = append(product_out, out)
out.Images = nil
}
json.NewEncoder(w).Encode(product_out)
}
您在包中將其聲明為全局變量:
var product_out []ProductOut
這樣,切片僅創建一次,並且您可以在請求之間共享它。
如果要為每個請求聲明一個新的切片,則應將該行移至GetProductInfo
函數中。
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