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Firebase PATCH - Updating Data

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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:

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Dim success As Boolean = 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.
Dim fac As ChilkatFileAccess
fac.Initialize
Dim accessToken As String = fac.ReadEntireTextFile("qa_data/tokens/firebaseToken.txt", "utf-8")
If fac.LastMethodSuccess <> True Then
    Log(fac.LastErrorText)
    Return
End If


Dim rest As ChilkatRest
rest.Initialize("rest")

'  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 = rest.Connect("chilkat.firebaseio.com", 443, True, True)
If success <> True Then
    Log(rest.LastErrorText)
    Return
End If

Dim authGoogle As ChilkatAuthGoogle
authGoogle.Initialize("authGoogle")
authGoogle.AccessToken = accessToken
rest.SetAuthGoogle(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"
Dim pigNameUpdate As ChilkatJsonObject
pigNameUpdate.Initialize
pigNameUpdate.AppendString("name", "Molly III")

'  The string content of the last arg passed is  {"name":"Molly III"} 
Dim jsonResponse As String = rest.FullRequestString("PATCH", "/pig-rescue/animal/-KI3bD-FU_Dake7sYOiP.json", pigNameUpdate.Emit)
If rest.LastMethodSuccess <> True Then
    '  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.)
    Log(rest.LastErrorText)
    Return
End If


'  Check the response status code.   A 200 response status indicates success.
If rest.ResponseStatusCode <> 200 Then
    Log(rest.ResponseStatusText)
    Log(jsonResponse)
    Log("Failed.")
    Return
End If


'  When successful, the response contains the data written.
Log(jsonResponse)
Log("Success.")