How should I switch based on the URL - go

Question

This is my URL in Postman: http://localhost:8000/filter?Name=Srinu
I am passing a query string to fetch records on the database based on a query.
In my database having Name, Gender, and Age, how should I write the switch statement based on the below code snippet, that I have to get data based on my query?
switch ? {
case "Name":
fiName := bson.D{{"Name", name}}
err = uc.session.DB(DB_NAME).C(DB_COLLECTION).Find(fiName).All(&json1)
if err == nil {
c.Writer.Header().Set("Content-Type", "application/json")
c.JSON(201, &json1)
} else {
c.JSON(500, gin.H{"result": "An error occured"})
}
case "Gender":
fiGender := bson.D{{"Gender", gender}}
err = uc.session.DB(DB_NAME).C(DB_COLLECTION).Find(fiGender).All(&json1)
if err == nil {
c.Writer.Header().Set("Content-Type", "application/json")
c.JSON(201, &json1)
} else {
c.JSON(500, gin.H{"result": "An error occured"})
}
case "Age":
fiAge := bson.D{{"Age", age}}
err = uc.session.DB(DB_NAME).C(DB_COLLECTION).Find(fiAge).All(&json1)
if err == nil {
c.Writer.Header().Set("Content-Type", "application/json")
c.JSON(201, &json1)
} else {
c.JSON(500, gin.H{"result": "An error occured"})
}
}

Answer 1

Use the following code:
r := ctx.Request
r.ParseForm()
switch {
case len(r.Form["Name"]) > 0:
name := r.Form["Name"][0]
fiName := bson.D{{"Name", name}}
err = uc.session.DB(DB_NAME).C(DB_COLLECTION).Find(fiName).All(&json1)
...
}
The call r.ParseForm() sets r.Form using data parsed from the request.
The field r.Form is a map of string slices. If a parameter is present in the query, then the length of the string slice for the parameter is greater than zero.
The statement name := r.Form["Name"][0] gets the first parameter value for Name. If request is http://localhost:8000/filter?Name=Srinu&Name=Reflect, then the second value Reflect is silently ignored.

Answer 2

You can use URL to see the results you can check
package main
import (
"fmt"
"net/url"
)
func main() {
u, err := url.Parse("http://localhost:8000/filter?Name=Srinu")
if err != nil {
fmt.Println(err)
}
query :=u.RawQuery
parsed, err := url.ParseQuery(query)
if err != nil {
fmt.Println(err)
}
switch true {
case parsed.Get("Name") != "" :
fmt.Println(parsed["Name"])
case parsed.Get("Age") != "":
fmt.Println(parsed["Age"])
default:
return
}
}