(SQL Server) Download Binary File to In-Memory Bytes

This example demonstrates how to download the binary content of a file from Google Drive directly into local memory.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

// 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
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 1

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

    -- This example uses a previously obtained access token having permission for the 
    -- Google Drive scope.

    DECLARE @gAuth int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.AuthGoogle', @gAuth OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OASetProperty @gAuth, 'AccessToken', 'GOOGLE-DRIVE-ACCESS-TOKEN'

    DECLARE @rest int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Rest', @rest OUT

    -- Connect using TLS.
    -- A single REST object, once connected, can be used for many Google Drive REST API calls.
    -- The auto-reconnect indicates that if the already-established HTTPS connection is closed,
    -- then it will be automatically re-established as needed.
    DECLARE @bAutoReconnect int
    SELECT @bAutoReconnect = 1
    EXEC sp_OAMethod @rest, 'Connect', @success OUT, 'www.googleapis.com', 443, 1, @bAutoReconnect

    -- Provide the authentication credentials (i.e. the access token)
    EXEC sp_OAMethod @rest, 'SetAuthGoogle', @success OUT, @gAuth

    -- ------------------------------------------------------------------------------
    -- To download a file, we must know the file ID.
    -- In a previous example (see Build Local Metadata Cache
    -- we built a local cache to make it easy to lookup file IDs given a file path.
    -- Let's say we want to download "testFolder/abc/123/penguins.jpg".
    -- First we lookup the fileId in the cache.  With the fileId, we can download the file.
    DECLARE @gdCache int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Cache', @gdCache OUT

    EXEC sp_OASetProperty @gdCache, 'Level', 0
    EXEC sp_OAMethod @gdCache, 'AddRoot', NULL, 'C:/ckCache/googleDrive'

    DECLARE @fileId nvarchar(4000)
    EXEC sp_OAMethod @gdCache, 'FetchText', @fileId OUT, 'testFolder/abc/123/penguins.jpg'
    EXEC sp_OAGetProperty @gdCache, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN

        PRINT 'Filepath not found in cache.'
        EXEC @hr = sp_OADestroy @gAuth
        EXEC @hr = sp_OADestroy @rest
        EXEC @hr = sp_OADestroy @gdCache
        RETURN
      END

    -- We need to send a GET request like this:
    -- GET https://www.googleapis.com/drive/v3/files/fileId?alt=media
    -- The fileId is part of the path.
    DECLARE @sbPath int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.StringBuilder', @sbPath OUT

    EXEC sp_OAMethod @sbPath, 'Append', @success OUT, '/drive/v3/files/'
    EXEC sp_OAMethod @sbPath, 'Append', @success OUT, @fileId
    EXEC sp_OAMethod @rest, 'AddQueryParam', @success OUT, 'alt', 'media'

    -- To download to memory, we'll send the request in one call, then receive
    -- the response header, and then the response body.
    -- If the response header indicates failure or an unexpected response, then the
    -- body is not the data we desire.

    -- First send the HTTP request.
    EXEC sp_OAMethod @sbPath, 'GetAsString', @sTmp0 OUT
    EXEC sp_OAMethod @rest, 'SendReqNoBody', @success OUT, 'GET', @sTmp0
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @rest, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @gAuth
        EXEC @hr = sp_OADestroy @rest
        EXEC @hr = sp_OADestroy @gdCache
        EXEC @hr = sp_OADestroy @sbPath
        RETURN
      END

    -- Get the response header.
    DECLARE @statusCode int
    EXEC sp_OAMethod @rest, 'ReadResponseHeader', @statusCode OUT
    IF @statusCode <> 200
      BEGIN

        EXEC sp_OAGetProperty @rest, 'ResponseStatusCode', @iTmp0 OUT
        PRINT 'response status code = ' + @iTmp0

        EXEC sp_OAGetProperty @rest, 'ResponseStatusText', @sTmp0 OUT
        PRINT 'response status text = ' + @sTmp0

        EXEC sp_OAGetProperty @rest, 'ResponseHeader', @sTmp0 OUT
        PRINT 'response header: ' + @sTmp0

        -- Read the response body (which should be error text or HTML)
        DECLARE @errResponseBody nvarchar(4000)
        EXEC sp_OAMethod @rest, 'ReadRespBodyString', @errResponseBody OUT
        EXEC sp_OAGetProperty @rest, 'LastMethodSuccess', @iTmp0 OUT
        IF @iTmp0 = 1
          BEGIN

            PRINT 'response body: ' + @errResponseBody
          END
        EXEC @hr = sp_OADestroy @gAuth
        EXEC @hr = sp_OADestroy @rest
        EXEC @hr = sp_OADestroy @gdCache
        EXEC @hr = sp_OADestroy @sbPath
        RETURN
      END

    -- Read the response body, which should contain the file data.

    EXEC sp_OAMethod @rest, 'ReadRespBodyBinary', @jpgBytes OUT
    EXEC sp_OAGetProperty @rest, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @rest, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @gAuth
        EXEC @hr = sp_OADestroy @rest
        EXEC @hr = sp_OADestroy @gdCache
        EXEC @hr = sp_OADestroy @sbPath
        RETURN
      END

    -- Save jpgBytes to a file so we can examine the file to verify that it worked.
    DECLARE @fac int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.FileAccess', @fac OUT

    EXEC sp_OAMethod @fac, 'WriteEntireFile', @success OUT, 'qa_output/penguins_out.jpg', @jpgBytes


    PRINT 'File downloaded.'

    EXEC @hr = sp_OADestroy @gAuth
    EXEC @hr = sp_OADestroy @rest
    EXEC @hr = sp_OADestroy @gdCache
    EXEC @hr = sp_OADestroy @sbPath
    EXEC @hr = sp_OADestroy @fac


END
GO