Delphi DLL

Firebase DELETE - Removing Data

See more Firebase Examples

Uses the DELETE method to delete data. The data used in this example is at Chilkat Firebase Pigs Database, and is shown here:

Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, FileAccess, Rest, AuthGoogle;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
fac: HCkFileAccess;
accessToken: PWideChar;
rest: HCkRest;
authGoogle: HCkAuthGoogle;
jsonResponse: PWideChar;

begin
success := False;

// Uses the DELETE method to delete a Firebase record.

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// This example assumes a JWT authentication token, if required, has been previously obtained.
// See Get Firebase Access Token from JSON Service Account Private Key for sample code.

// Load the previously obtained Firebase access token into a string.
fac := CkFileAccess_Create();
accessToken := CkFileAccess__readEntireTextFile(fac,'qa_data/tokens/firebaseToken.txt','utf-8');
if (CkFileAccess_getLastMethodSuccess(fac) <> True) then
  begin
    Memo1.Lines.Add(CkFileAccess__lastErrorText(fac));
    Exit;
  end;

rest := CkRest_Create();

// Make the initial connection (without sending a request yet).
// Once connected, any number of requests may be sent.  It is not necessary to explicitly
// call Connect before each request.  
success := CkRest_Connect(rest,'chilkat.firebaseio.com',443,True,True);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;
authGoogle := CkAuthGoogle_Create();
CkAuthGoogle_putAccessToken(authGoogle,accessToken);
CkRest_SetAuthGoogle(rest,authGoogle);

// Chilkat's sample data (pig-rescue data) is publicly readable at: https://chilkat.firebaseio.com/.json
// This data is publicly readable, but not writable.  You'll need to 
// run against your own database..

// We're going to delete a pig we previously added.  The push ID of that pig was -KI3pT33wKauiMxY4QTB,
// so the path will be "/pig-rescue/animal/-KI3pT33wKauiMxY4QTB.json"

jsonResponse := CkRest__fullRequestNoBody(rest,'DELETE','/pig-rescue/animal/-KI3pT33wKauiMxY4QTB.json');
if (CkRest_getLastMethodSuccess(rest) <> True) then
  begin
    // Something happened in the communications (either no request was sent, or no response was received.
    // (The Chilkat REST API also has lower-level methods where an app can send the request in one call,
    // and then receive the response in another call.)
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// Check the response status code.   A 200 response status indicates success.
if (CkRest_getResponseStatusCode(rest) <> 200) then
  begin
    Memo1.Lines.Add(CkRest__responseStatusText(rest));
    Memo1.Lines.Add(jsonResponse);
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

Memo1.Lines.Add('Success.');

CkFileAccess_Dispose(fac);
CkRest_Dispose(rest);
CkAuthGoogle_Dispose(authGoogle);

end;