SQL Server

Base62 Encoding and Decoding

Demonstrates base62 encoding and decoding. 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 @bd int
    EXEC @hr = sp_OACreate 'Chilkat.BinData', @bd OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Base62 encode.
    DECLARE @success int
    EXEC sp_OAMethod @bd, 'AppendString', @success OUT, 'hello world', 'utf-8'
    DECLARE @base62_encoded nvarchar(4000)
    EXEC sp_OAMethod @bd, 'GetEncoded', @base62_encoded OUT, 'base62'

    PRINT 'hello world --> ' + @base62_encoded

    -- Output: 
    -- hello world --> AAwf93rvy4aWQVw

    -- Base62 decode
    DECLARE @sb int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sb OUT

    EXEC sp_OAMethod @sb, 'DecodeAndAppend', @success OUT, 'AAwf93rvy4aWQVw', 'base62', 'utf-8'

    EXEC sp_OAMethod @sb, 'GetAsString', @sTmp0 OUT
    PRINT 'decoded: ' + @sTmp0

    -- Output:
    -- decoded: hello world

    EXEC @hr = sp_OADestroy @bd
    EXEC @hr = sp_OADestroy @sb


END
GO