SQL Server

Download a Binary File into Memory

See more Azure Cloud Storage Examples

Downloads a binary file into memory. 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

    -- Azure File Service Example: Download a Binary File to Memory
    -- See:  https://docs.microsoft.com/en-us/rest/api/storageservices/get-file

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

    DECLARE @rest int
    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".
    EXEC sp_OAMethod @rest, 'Connect', @success OUT, 'chilkat.file.core.windows.net', @port, @bTls, @bAutoReconnect
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @rest, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @rest
        RETURN
      END

    -- Provide Azure Cloud credentials for the REST calls.
    DECLARE @azAuth int
    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', 'File'
    -- 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: x-ms-date, Authorization.  These headers
    -- are automatically set by Chilkat.

    -- Send a GET request to download the file "penguins.jpg" to a BinData object.
    -- (The share name is "pip")
    DECLARE @bdFileContents int
    EXEC @hr = sp_OACreate 'Chilkat.BinData', @bdFileContents OUT

    EXEC sp_OAMethod @rest, 'FullRequestNoBodyBd', @success OUT, 'GET', '/pip/wildlife/antarctic/penguins.jpg', @bdFileContents
    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 @bdFileContents
        RETURN
      END

    -- When successful, the response status will be 200.
    -- If a non-success status code is returned, then the bdFileContents actually contains the XML error message.
    EXEC sp_OAGetProperty @rest, 'ResponseStatusCode', @iTmp0 OUT
    IF @iTmp0 <> 200
      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
        DECLARE @sbXmlErr int
        EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbXmlErr OUT

        EXEC sp_OAMethod @sbXmlErr, 'AppendBd', @success OUT, @bdFileContents, 'utf-8', 0, 0

        EXEC sp_OAMethod @sbXmlErr, '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 @bdFileContents
        EXEC @hr = sp_OADestroy @sbXmlErr
        RETURN
      END


    EXEC sp_OAGetProperty @bdFileContents, 'NumBytes', @iTmp0 OUT
    PRINT 'Size of the downloaded file = ' + @iTmp0

    -- See the online reference documentation for the BinData class for ways
    -- to access the bytes.

    EXEC sp_OAMethod @bdFileContents, 'WriteFile', @success OUT, 'qa_output/penguins.jpg'

    EXEC @hr = sp_OADestroy @rest
    EXEC @hr = sp_OADestroy @azAuth
    EXEC @hr = sp_OADestroy @bdFileContents
    EXEC @hr = sp_OADestroy @sbXmlErr


END
GO