(SQL Server) Upload File in Blocks and Commit the Block List

See more Azure Cloud Storage Examples

Demonstrates how to upload a file in blocks and then commit the block list. For files larger than 64MB, this is the way to upload to Azure Storage. Azure limits the size of each block to a maximum of 4MB.

For more information, see https://learn.microsoft.com/en-us/rest/api/storageservices/put-block-list?tabs=microsoft-entra-id

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 @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 @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 @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

        -- 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 @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 @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>

    -- 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 @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 @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 @sbResponseBody
    EXEC @hr = sp_OADestroy @uriPath
    EXEC @hr = sp_OADestroy @dataBlock


END
GO