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swiftでfirebaseの追加、更新、削除

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前提

class ViewController: UIViewController {

    // インスタンス変数
    var DBRef:FIRDatabaseReference!

    override func viewDidLoad() {
        super.viewDidLoad()

        //インスタンスを作成
        DBRef = FIRDatabase.database().reference()
    }
}

データ追加

指定先と同じ階層のは消える。つまり、sampleの他に同じ階層にデータがあったら更新されて削除される。

let data = ["sample": "add_data"]
DBRef.child("hoge/foo").setValue(data)
スクリーンショット 2017-12-11 22.37.05.png

更新

setValueだと同じ階層のものが消えてしまうので、updateChildValuesを使用

let data = ["update": "updata_data"]
DBRef.child("hoge/foo").updateChildValues(data)
スクリーンショット 2017-12-11 22.47.55.png

削除

DBRef.child("hoge/foo/update").removeValue()

データ取得

let defaultPlace = DBRef.child("hoge/foo/sample")
defaultPlace.observe(.value) { (snap: DataSnapshot) in 
    //処理したい内容
  print((snap.value! as AnyObject).description)}
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