SQL Server

Paging User Photos with Cursor

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Demonstrates how to iterate over the pages of user photos using a cursor. SQL Server

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

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

    -- This example assumes a previously obtained an access token
    DECLARE @oauth2 int
    EXEC @hr = sp_OACreate 'Chilkat.OAuth2', @oauth2 OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OASetProperty @oauth2, 'AccessToken', 'FACEBOOK-ACCESS-TOKEN'

    DECLARE @rest int
    EXEC @hr = sp_OACreate 'Chilkat.Rest', @rest OUT

    -- Connect to Facebook.
    EXEC sp_OAMethod @rest, 'Connect', @success OUT, 'graph.facebook.com', 443, 1, 1
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @rest, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @oauth2
        EXEC @hr = sp_OADestroy @rest
        RETURN
      END

    -- Provide the authentication credentials (i.e. the access key)
    EXEC sp_OAMethod @rest, 'SetAuthOAuth2', @success OUT, @oauth2

    -- Indicate that we only want the photos the user has personally uploaded.
    EXEC sp_OAMethod @rest, 'AddQueryParam', @success OUT, 'type', 'uploaded'

    -- We could limit the number of photos per page using the "limit" field.
    EXEC sp_OAMethod @rest, 'AddQueryParam', @success OUT, 'limit', '20'

    -- Get the 1st page of photos. (Not the actual image data, but the information about each photo.)
    -- See https://developers.facebook.com/docs/graph-api/reference/user/photos/ for more information.
    DECLARE @responseJson nvarchar(4000)
    EXEC sp_OAMethod @rest, 'FullRequestNoBody', @responseJson OUT, 'GET', '/v2.7/me/photos'
    EXEC sp_OAGetProperty @rest, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @rest, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @oauth2
        EXEC @hr = sp_OADestroy @rest
        RETURN
      END

    DECLARE @json int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json OUT

    EXEC sp_OASetProperty @json, 'EmitCompact', 0
    EXEC sp_OAMethod @json, 'Load', @success OUT, @responseJson
    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    -- 
    -- See Parsing the Facebook User Photos for code showing how to parse the JSON photos content.
    -- 

    -- Get the "after" cursor.
    DECLARE @afterCursor nvarchar(4000)
    EXEC sp_OAMethod @json, 'StringOf', @afterCursor OUT, 'paging.cursors.after'
    EXEC sp_OAGetProperty @json, 'LastMethodSuccess', @iTmp0 OUT
    WHILE @iTmp0 = 1
      BEGIN


        PRINT 'after cursor: ' + @afterCursor

        -- Prepare for getting the next page of photos.
        -- We can continue using the same REST object.
        -- If already connected, we'll continue using the existing connection.
        -- Otherwise, a new connection will automatically be made if needed.
        EXEC sp_OAMethod @rest, 'ClearAllQueryParams', @success OUT
        EXEC sp_OAMethod @rest, 'AddQueryParam', @success OUT, 'type', 'uploaded'
        EXEC sp_OAMethod @rest, 'AddQueryParam', @success OUT, 'limit', '20'
        EXEC sp_OAMethod @rest, 'AddQueryParam', @success OUT, 'after', @afterCursor

        EXEC sp_OAMethod @rest, 'FullRequestNoBody', @responseJson OUT, 'GET', '/v2.7/me/photos'
        EXEC sp_OAGetProperty @rest, 'LastMethodSuccess', @iTmp0 OUT
        IF @iTmp0 <> 1
          BEGIN
            EXEC sp_OAGetProperty @rest, 'LastErrorText', @sTmp0 OUT
            PRINT @sTmp0
            EXEC @hr = sp_OADestroy @oauth2
            EXEC @hr = sp_OADestroy @rest
            EXEC @hr = sp_OADestroy @json
            RETURN
          END

        EXEC sp_OAMethod @json, 'Load', @success OUT, @responseJson
        -- See Parsing the Facebook User Photos for code showing how to parse the JSON photos content.

        EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
        PRINT @sTmp0

        -- Get the cursor for the next page.
        EXEC sp_OAMethod @json, 'StringOf', @afterCursor OUT, 'paging.cursors.after'
      END


    PRINT 'No more pages of photos.'

    EXEC @hr = sp_OADestroy @oauth2
    EXEC @hr = sp_OADestroy @rest
    EXEC @hr = sp_OADestroy @json


END
GO