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[英]How to retrieve all data from Firebase Realtime Database if I have the next structure?
[英]How to retrieve data from Firebase that have 2 layer structure?
我的 Firebase 中有 2 層表結構。 我在檢索這個時遇到問題。 如何從我的 Firebase 中檢索這些數據? 我已經提供了我的主要代碼和我的訂單 class。
這是我的代碼
databaseReference = FirebaseDatabase.getInstance().getReference("Order");
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
orderList = new ArrayList<>();
for (DataSnapshot orderSnapshot : dataSnapshot.getChildren()) {
orderList.add(orderSnapshot.getValue(Order.class));
}
psOrderAdapter PsOrderAdapter = new psOrderAdapter(orderList);
recyclerView.setAdapter(PsOrderAdapter);
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Toast.makeText(ManageOrder.this, databaseError.getMessage(), Toast.LENGTH_SHORT).show();
}
});
public class Order {
public String cust_id;
public String pro_id;
public String total;
public String name;
public String address;
public String phone;
public String status;
public String date;
public String dateTime;
public Order() {
}
public Order(String cust_id, String pro_id, String total, String name, String address, String phone, String status,String date, String dateTime) {
this.cust_id = cust_id;
this.total = total;
this.name = name;
this.address = address;
this.phone = phone;
this.pro_id = pro_id;
this.status = status;
this.date=date;
this.dateTime=dateTime;
}
//getter and setter
}
我期待這樣的結果
嘗試以下操作:
for(DataSnapshot orderSnapshot : dataSnapshot.getChildren()) {
for(DataSnapshot ds : orderSnapshot.getChildren()) {
orderList.add(ds.getValue(Order.class));
}
}
添加另一個 for 循環以便能夠檢索數據。
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