(SQL Server) Unzip Encrypted Text into a String Variable

Demonstrates how to open an encrypted .zip archive and unzip a text file directly into a string variable.

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

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

    -- Set the password required for decrypting.
    EXEC sp_OASetProperty @zip, 'DecryptPassword', 'myPassword'

    DECLARE @success int
    EXEC sp_OAMethod @zip, 'OpenZip', @success OUT, 'encrypted.zip'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

    -- Locate the file within the Zip to be unzipped into a string variable:
    DECLARE @entry int
    EXEC sp_OAMethod @zip, 'FirstMatchingEntry', @entry OUT, '*.csv'
    EXEC sp_OAGetProperty @zip, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN

        PRINT 'No matching entry found.'
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

    -- lineEndingBehavior:
    -- 0 = leave unchanged.
    -- 1 = convert all to bare LF's
    -- 2 = convert all to CRLF's
    DECLARE @lineEndingBehavior int
    SELECT @lineEndingBehavior = 0
    DECLARE @srcCharset nvarchar(4000)
    SELECT @srcCharset = 'utf-8'

    DECLARE @strCsv nvarchar(4000)
    EXEC sp_OAMethod @entry, 'UnzipToString', @strCsv OUT, @lineEndingBehavior, @srcCharset

    PRINT @strCsv
    EXEC @hr = sp_OADestroy @entry


    EXEC @hr = sp_OADestroy @zip


END
GO