SQL Server

Gzip Compress In Memory and Base64 Encode

See more Gzip Examples

Demonstrates how to Gzip compress in-memory data and then encode the compressed data to base64. 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
    -- 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 assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

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

    -- This example will load a file into the fileData object.
    -- Your application might load fileData from other sources..
    DECLARE @fileData int
    EXEC @hr = sp_OACreate 'Chilkat.BinData', @fileData OUT

    EXEC sp_OAMethod @fileData, 'LoadFile', @success OUT, 'qa_data/xml/hamlet.xml'
    IF @success <> 1
      BEGIN

        PRINT 'Failed to load file.'
        EXEC @hr = sp_OADestroy @gzip
        EXEC @hr = sp_OADestroy @fileData
        RETURN
      END

    -- In-place compress the contents of fileData
    EXEC sp_OAMethod @gzip, 'CompressBd', @success OUT, @fileData
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @gzip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @gzip
        EXEC @hr = sp_OADestroy @fileData
        RETURN
      END

    -- Get the base64 encoded compressed data (in a single line).
    DECLARE @strBase64 nvarchar(4000)
    EXEC sp_OAMethod @fileData, 'GetEncoded', @strBase64 OUT, 'base64'

    PRINT @strBase64

    PRINT '--------'

    -- To get the base64 in multiple lines, as it might appear in MIME,
    -- use "base64-mime".
    DECLARE @strBase64MultiLine nvarchar(4000)
    EXEC sp_OAMethod @fileData, 'GetEncoded', @strBase64MultiLine OUT, 'base64-mime'

    PRINT @strBase64MultiLine

    EXEC @hr = sp_OADestroy @gzip
    EXEC @hr = sp_OADestroy @fileData


END
GO