(SQL Server) Unzip Some Files by Iterating over Entries

Demonstrates how to unzip specific files by iterating over entries in a .zip.

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 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

    -- Open a .zip containing:
    -- 
    -- a1.xml
    -- b1.xml
    -- c1.xml
    -- dir1/a2.xml
    -- dir1/c2.xml
    -- dir2/dir3/c3.xml

    -- We wish to unzip only a1.xml, b1.xml, and c1.xml
    DECLARE @success int
    EXEC sp_OAMethod @zip, 'OpenZip', @success OUT, 'qa_data/zips/xml_files.zip'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

    DECLARE @sbFilename int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbFilename OUT

    DECLARE @numEntries int
    EXEC sp_OAGetProperty @zip, 'NumEntries', @numEntries OUT
    DECLARE @i int
    SELECT @i = 0
    WHILE @i < @numEntries
      BEGIN
        DECLARE @entry int
        EXEC sp_OAMethod @zip, 'GetEntryByIndex', @entry OUT, @i

        DECLARE @entryFilePath nvarchar(4000)
        EXEC sp_OAGetProperty @entry, 'FileName', @entryFilePath OUT

        PRINT @entryFilePath

        EXEC sp_OAGetProperty @entry, 'IsDirectory', @iTmp0 OUT
        IF @iTmp0 = 0
          BEGIN
            EXEC sp_OAMethod @sbFilename, 'SetString', @success OUT, @entryFilePath
            EXEC sp_OAMethod @sbFilename, 'Contains', @iTmp0 OUT, '/', 0
            IF @iTmp0 = 0
              BEGIN
                -- Does not contain "/"
                -- Unzip to the qa_output directory.
                EXEC sp_OAMethod @entry, 'Extract', @success OUT, 'qa_output'
                IF @success = 0
                  BEGIN

                    PRINT 'Failed to unzip ' + @entryFilePath
                  END
                ELSE
                  BEGIN

                    PRINT 'Unzipped ' + @entryFilePath
                  END
              END
          END
        EXEC @hr = sp_OADestroy @entry

        SELECT @i = @i + 1
      END

    EXEC @hr = sp_OADestroy @zip
    EXEC @hr = sp_OADestroy @sbFilename


END
GO