Delphi DLL

Firebase PATCH - Updating Data

See more Firebase Examples

Uses the PATCH method to update record with new information. 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, JsonObject;

...

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

begin
success := False;

// Uses the PATCH method to update 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 update "Molly II" to "Molly III"
pigNameUpdate := CkJsonObject_Create();
CkJsonObject_AppendString(pigNameUpdate,'name','Molly III');

// The string content of the last arg passed is  {"name":"Molly III"} 
jsonResponse := CkRest__fullRequestString(rest,'PATCH','/pig-rescue/animal/-KI3bD-FU_Dake7sYOiP.json',CkJsonObject__emit(pigNameUpdate));
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;

// When successful, the response contains the data written.
Memo1.Lines.Add(jsonResponse);
Memo1.Lines.Add('Success.');

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

end;