(SQL Server) Base64 Encode/Decode a String

SQL Server example to base-64 encode and decode a string.

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

    DECLARE @s nvarchar(4000)
    SELECT @s = 'A friend called me up the other day and talked about investing in a dot-com that sells lobsters. Internet lobsters. Where will this end? --Donald Trump'

    DECLARE @success int
    EXEC sp_OAMethod @bd, 'AppendString', @success OUT, @s, 'utf-8'

    DECLARE @strBase64 nvarchar(4000)
    EXEC sp_OAMethod @bd, 'GetEncoded', @strBase64 OUT, 'base64'

    PRINT @strBase64

    -- To decode:
    DECLARE @bd2 int
    -- Use "Chilkat_9_5_0.BinData" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.BinData', @bd2 OUT

    EXEC sp_OAMethod @bd2, 'AppendEncoded', @success OUT, @strBase64, 'base64'

    DECLARE @decoded nvarchar(4000)
    EXEC sp_OAMethod @bd2, 'GetString', @decoded OUT, 'utf-8'

    PRINT @decoded

    EXEC @hr = sp_OADestroy @bd
    EXEC @hr = sp_OADestroy @bd2


END
GO