(SQL Server) Upload File in Blocks (with Content-MD5 header) and Commit the Block List

Demonstrates how to upload a file in blocks and then commit the block list. This example includes a Content-MD5 header for each block.

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
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- Azure Blob Service Example: Upload a file in blocks, and then commit the block list.
    -- See also: https://msdn.microsoft.com/en-us/library/azure/dd135726.aspx

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

    DECLARE @rest int
    -- Use "Chilkat_9_5_0.Rest" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Rest', @rest OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Connect to the Azure Storage Blob Service
    DECLARE @bTls int
    SELECT @bTls = 1
    DECLARE @port int
    SELECT @port = 443
    DECLARE @bAutoReconnect int
    SELECT @bAutoReconnect = 1
    -- In this example, the storage account name is "chilkat".
    DECLARE @success int
    EXEC sp_OAMethod @rest, 'Connect', @success OUT, 'chilkat.blob.core.windows.net', @port, @bTls, @bAutoReconnect
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @rest, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @rest
        RETURN
      END

    -- Provide Azure Cloud credentials for the REST call.
    DECLARE @azAuth int
    -- Use "Chilkat_9_5_0.AuthAzureStorage" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.AuthAzureStorage', @azAuth OUT

    EXEC sp_OASetProperty @azAuth, 'AccessKey', 'AZURE_ACCESS_KEY'
    -- The account name used here should match the 1st part of the domain passed in the call to Connect (above).
    EXEC sp_OASetProperty @azAuth, 'Account', 'chilkat'
    EXEC sp_OASetProperty @azAuth, 'Scheme', 'SharedKey'
    EXEC sp_OASetProperty @azAuth, 'Service', 'Blob'
    -- This causes the "x-ms-version: 2021-08-06" header to be automatically added.
    EXEC sp_OASetProperty @azAuth, 'XMsVersion', '2021-08-06'
    EXEC sp_OAMethod @rest, 'SetAuthAzureStorage', @success OUT, @azAuth

    -- Note: The application does not need to explicitly set the following
    -- headers: Content-Length, x-ms-date, Authorization.  These headers
    -- are automatically set by Chilkat.

    -- As the blocks are uploaded, we'll keep an XML block list for the subsequent commit..
    DECLARE @xml int
    -- Use "Chilkat_9_5_0.Xml" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Xml', @xml OUT

    EXEC sp_OASetProperty @xml, 'Tag', 'BlockList'

    -- Any type of file can be uploaded in this way.  It can a text file, binary file, anything...
    -- This example will upload an XML file that is approximately 275K in size.  It can be downloaded
    -- at http://www.chilkatsoft.com/hamlet.xml
    DECLARE @fac int
    -- Use "Chilkat_9_5_0.FileAccess" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.FileAccess', @fac OUT

    EXEC sp_OAMethod @fac, 'OpenForRead', @success OUT, 'qa_data/xml/hamlet.xml'
    -- Assuming success for the example..

    -- We'll upload in 16K blocks (normally a program would upload in larger block sizes than this,
    -- but this is just an example...)
    DECLARE @blockSize int
    SELECT @blockSize = 16384

    -- How many 16K blocks?  (Including 1 for the last partial block)
    DECLARE @numBlocks int
    EXEC sp_OAMethod @fac, 'GetNumBlocks', @numBlocks OUT, @blockSize

    DECLARE @crypt int
    -- Use "Chilkat_9_5_0.Crypt2" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Crypt2', @crypt OUT

    EXEC sp_OASetProperty @crypt, 'HashAlgorithm', 'md5'

    DECLARE @sbResponseBody int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbResponseBody OUT

    DECLARE @uriPath int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @uriPath OUT

    DECLARE @blockId nvarchar(4000)

    DECLARE @dataBlock int
    -- Use "Chilkat_9_5_0.BinData" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.BinData', @dataBlock OUT

    DECLARE @contentMd5 nvarchar(4000)

    DECLARE @i int
    SELECT @i = 0
    WHILE @i < @numBlocks
      BEGIN

        EXEC sp_OAMethod @dataBlock, 'Clear', @success OUT
        EXEC sp_OAMethod @fac, 'ReadBlockBd', @success OUT, @i, @blockSize, @dataBlock
        IF @success = 0
          BEGIN
            EXEC sp_OAGetProperty @fac, 'LastErrorText', @sTmp0 OUT
            PRINT @sTmp0
            EXEC @hr = sp_OADestroy @rest
            EXEC @hr = sp_OADestroy @azAuth
            EXEC @hr = sp_OADestroy @xml
            EXEC @hr = sp_OADestroy @fac
            EXEC @hr = sp_OADestroy @crypt
            EXEC @hr = sp_OADestroy @sbResponseBody
            EXEC @hr = sp_OADestroy @uriPath
            EXEC @hr = sp_OADestroy @dataBlock
            RETURN
          END

        -- Generate a base64 block ID.  
        -- (Chilkat provides a helper method named GenBlockId to make this easy)
        -- A pre-base64 encoded block ID length of 4 is sufficient in this case because
        -- this file certainly won't have more than 99,999 blocks..
        EXEC sp_OAMethod @fac, 'GenBlockId', @blockId OUT, @i, 4, 'base64'

        -- Add this blockId to the list of blocks to be committed.
        EXEC sp_OAMethod @xml, 'NewChild2', NULL, 'Latest', @blockId

        -- Build the URI path
        EXEC sp_OAMethod @uriPath, 'Clear', NULL
        EXEC sp_OAMethod @uriPath, 'Append', @success OUT, '/mycontainer/hamlet.xml?comp=block&blockId='
        EXEC sp_OAMethod @uriPath, 'Append', @success OUT, @blockId

        EXEC sp_OAMethod @crypt, 'HashBdENC', @contentMd5 OUT, @dataBlock
        EXEC sp_OAMethod @rest, 'AddHeader', @success OUT, 'Content-MD5', @contentMd5

        -- Upload this block..
        EXEC sp_OAMethod @sbResponseBody, 'Clear', NULL
        EXEC sp_OAMethod @uriPath, 'GetAsString', @sTmp0 OUT
        EXEC sp_OAMethod @rest, 'FullRequestBd', @success OUT, 'PUT', @sTmp0, @dataBlock, @sbResponseBody
        IF @success = 0
          BEGIN
            EXEC sp_OAGetProperty @rest, 'LastErrorText', @sTmp0 OUT
            PRINT @sTmp0
            EXEC @hr = sp_OADestroy @rest
            EXEC @hr = sp_OADestroy @azAuth
            EXEC @hr = sp_OADestroy @xml
            EXEC @hr = sp_OADestroy @fac
            EXEC @hr = sp_OADestroy @crypt
            EXEC @hr = sp_OADestroy @sbResponseBody
            EXEC @hr = sp_OADestroy @uriPath
            EXEC @hr = sp_OADestroy @dataBlock
            RETURN
          END

        -- Verify that we received a 201 status code.
        EXEC sp_OAGetProperty @rest, 'ResponseStatusCode', @iTmp0 OUT
        IF @iTmp0 <> 201
          BEGIN
            -- Examine the request/response to see what happened.

            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

            EXEC sp_OAMethod @sbResponseBody, 'GetAsString', @sTmp0 OUT
            PRINT 'response body (if any): ' + @sTmp0

            PRINT '---'

            EXEC sp_OAGetProperty @rest, 'LastRequestStartLine', @sTmp0 OUT
            PRINT 'LastRequestStartLine: ' + @sTmp0

            EXEC sp_OAGetProperty @rest, 'LastRequestHeader', @sTmp0 OUT
            PRINT 'LastRequestHeader: ' + @sTmp0
            EXEC @hr = sp_OADestroy @rest
            EXEC @hr = sp_OADestroy @azAuth
            EXEC @hr = sp_OADestroy @xml
            EXEC @hr = sp_OADestroy @fac
            EXEC @hr = sp_OADestroy @crypt
            EXEC @hr = sp_OADestroy @sbResponseBody
            EXEC @hr = sp_OADestroy @uriPath
            EXEC @hr = sp_OADestroy @dataBlock
            RETURN
          END

        SELECT @i = @i + 1
      END

    EXEC sp_OAMethod @fac, 'FileClose', NULL

    -- Now commit the blocks.
    -- Let's have a look at the XML that will commit the blocks:
    DECLARE @xmlStr nvarchar(4000)
    EXEC sp_OAMethod @xml, 'GetXml', @xmlStr OUT

    PRINT @xmlStr

    -- The XML will look like this:

    -- <?xml version="1.0" encoding="utf-8" ?>
    -- <BlockList>
    --     <Latest>MDAwMA==</Latest>
    --     <Latest>MDAwMQ==</Latest>
    --     <Latest>MDAwMg==</Latest>
    --     <Latest>MDAwMw==</Latest>
    --     <Latest>MDAwNA==</Latest>
    --     <Latest>MDAwNQ==</Latest>
    --     <Latest>MDAwNg==</Latest>
    --     <Latest>MDAwNw==</Latest>
    --     <Latest>MDAwOA==</Latest>
    --     <Latest>MDAwOQ==</Latest>
    --     <Latest>MDAxMA==</Latest>
    --     <Latest>MDAxMQ==</Latest>
    --     <Latest>MDAxMg==</Latest>
    --     <Latest>MDAxMw==</Latest>
    --     <Latest>MDAxNA==</Latest>
    --     <Latest>MDAxNQ==</Latest>
    --     <Latest>MDAxNg==</Latest>
    --     <Latest>MDAxNw==</Latest>
    -- </BlockList>

    -- --------------------------------------------------------------------------
    -- IMPORTANT: Remove the Content-MD5 header previously set in the loop above.
    -- --------------------------------------------------------------------------
    EXEC sp_OAMethod @rest, 'RemoveHeader', @success OUT, 'Content-MD5'

    -- Send the PUT Block List...
    DECLARE @responseStr nvarchar(4000)
    EXEC sp_OAMethod @rest, 'FullRequestString', @responseStr OUT, 'PUT', '/mycontainer/hamlet.xml?comp=blocklist', @xmlStr
    EXEC sp_OAGetProperty @rest, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @rest, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @rest
        EXEC @hr = sp_OADestroy @azAuth
        EXEC @hr = sp_OADestroy @xml
        EXEC @hr = sp_OADestroy @fac
        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @sbResponseBody
        EXEC @hr = sp_OADestroy @uriPath
        EXEC @hr = sp_OADestroy @dataBlock
        RETURN
      END

    -- When successful, the Azure Storage service will respond with a 201 response status code,
    -- with no response body.

    EXEC sp_OAGetProperty @rest, 'ResponseStatusCode', @iTmp0 OUT
    IF @iTmp0 <> 201
      BEGIN
        -- Examine the request/response to see what happened.

        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

        PRINT 'response body (if any): ' + @responseStr

        PRINT '---'

        EXEC sp_OAGetProperty @rest, 'LastRequestStartLine', @sTmp0 OUT
        PRINT 'LastRequestStartLine: ' + @sTmp0

        EXEC sp_OAGetProperty @rest, 'LastRequestHeader', @sTmp0 OUT
        PRINT 'LastRequestHeader: ' + @sTmp0
        EXEC @hr = sp_OADestroy @rest
        EXEC @hr = sp_OADestroy @azAuth
        EXEC @hr = sp_OADestroy @xml
        EXEC @hr = sp_OADestroy @fac
        EXEC @hr = sp_OADestroy @crypt
        EXEC @hr = sp_OADestroy @sbResponseBody
        EXEC @hr = sp_OADestroy @uriPath
        EXEC @hr = sp_OADestroy @dataBlock
        RETURN
      END


    PRINT 'Success.'

    EXEC @hr = sp_OADestroy @rest
    EXEC @hr = sp_OADestroy @azAuth
    EXEC @hr = sp_OADestroy @xml
    EXEC @hr = sp_OADestroy @fac
    EXEC @hr = sp_OADestroy @crypt
    EXEC @hr = sp_OADestroy @sbResponseBody
    EXEC @hr = sp_OADestroy @uriPath
    EXEC @hr = sp_OADestroy @dataBlock


END
GO