(SQL Server) GZip Decompress File

Demonstrates how to uncompress a .gz compressed file to get the uncompressed original file.

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
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

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

    DECLARE @success int
    EXEC sp_OAMethod @gzip, 'UncompressFile', @success OUT, 'qa_data/gzip/something.csv.gz', 'qa_output/something.csv'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @gzip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @gzip
        RETURN
      END


    PRINT 'File successfully uncompressed and extracted from the Gzip compressed format.'

    EXEC @hr = sp_OADestroy @gzip


END
GO