如何使用swift从firebase中的JSON文件中获取电子邮件ID

JSON Image我想查询如下：如果我发送电子邮件，那么我必须得到ID。 目前我可以获取电子邮件或ID，但我需要以下示例的解决方案。

例如1）如果我给[e-mail]那么我需要它的ID为123 。

我怎样才能在swift中实现这一目标？

这是我的JSON文件：

 { "ID": 123, "Membership": 1234, "title": "Mr.", "firstname": "kumar", "lastname": "sandeep", "email": "[e-mail]", "membrshipstatus": "Active", "volunteer": "Yes", "creationDate": "2016-12-27 " }, { "ID": 452, "Membership": 4531, "title": "Mr.", "firstname": "kumar", "lastname": "sandeep", "email": "[e-mail]", "membrshipstatus": "Active", "volunteer": "Yes", "creationDate": "2016-11-17 " }, 

这是我的Swift代码：

  import UIKit import Firebase import FirebaseAuth class ViewController: UIViewController { @IBOutlet weak var emailofUser: UITextField! @IBOutlet weak var passwordofUser: UITextField! var ref:FIRDatabaseReference! //created a variable ref of type firebase database reference var databaseHandle:FIRDatabaseHandle? //to handle to database listener like to stop or start it var postdata = [String]?() var postall = [[String:String]]() override func viewDidLoad() { super.viewDidLoad() //set firebase reference ref = FIRDatabase.database().reference() ref.child("1").child("email").observeEventType(.Value, withBlock: { snapshot in let emailid = snapshot.value as? String print(emailid) }) ref.child("1").child("ID").observeEventType(.Value, withBlock: { snapshot1 in let userID = snapshot1.value as? Int print(userID) }) ref.queryOrderedByValue().observeEventType(.ChildAdded, withBlock: { snapshot2 in if let parentname = snapshot2.value as? Int { print("The \(snapshot2.key) dinosaur's score is \(parentname)") } }) } } 

与此JSON映像相关的Swift代码：

 override func viewDidLoad() { super.viewDidLoad() //set firebase reference ref = FIRDatabase.database().reference() let userRef = ref.child("1") //let queryRef = userRef.queryOrderedByChild("email").queryEqualToValue("[e-mail]") userRef.queryOrderedByChild("email").queryEqualToValue("[e-mail]").observeEventType(.Value, withBlock: { snapshot in for child in snapshot.children{ let snap = child as! FIRDataSnapshot let userDict = snap.value as! [String:Any] let userId = userDict["ID"] let lastname = userDict["lastname"] print("\(userId!) \(lastname!)") } }) 

Answer 1

您应该使用用户的uid来将数据存储在用户节点中。 假设您的用户节点被称为/ users …就像这样

 users uid_0 "ID": 123, "Membership": 1234, "title": "Mr.", "firstname": "kumar", "lastname": "sandeep", "email": "[e-mail]" uid_1 "ID": 452, "Membership": 4531, "title": "Mr.", "firstname": "kumar", "lastname": "sandeep" "email": "[e-mail]" 

这是获取您询问的数据的查询

 let usersRef = ref.child("users") let queryRef = usersRef.queryOrdered(byChild: "email") .queryEqual(toValue: "[e-mail]") queryRef.observeSingleEvent(of: .value, with: { (snapshot) in for child in snapshot.children { let snap = child as! FIRDataSnapshot let userDict = snap.value as! [String: Any] let userId = userDict["ID"] let lastname = userDict["lastname"] print("\(userId!) \(lastname!)") } }) 

并打印结果：

 123 sandeep