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POOracle GUIDTORAW and RAWTOGUID function endianness
 

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  1. POOracle GUIDTORAW and RAWTOGUID function endianness
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    <p>My app internally uses RAW(16) guids generated via sys_guid().<br> Recently I started associating Active Directory users where I get guid's in the format of: 00000000-0000-0000-0000-00000000000</p> <p>Are the following two functions doing this conversion correctly?</p> <p>Found the following site:</p> <p><a href="http://www.timvasil.com/blog14/post/2009/01/20/User-defined-function-to-convert-from-RAW(16)-to-a-GUID-in-Oracle.aspx" rel="noreferrer">http://www.timvasil.com/blog14/post/2009/01/20/User-defined-function-to-convert-from-RAW(16)-to-a-GUID-in-Oracle.aspx</a></p> <pre><code>create or replace FUNCTION RAWTOGUID ( RawData IN RAW ) RETURN VARCHAR AS BEGIN declare HexData varchar(32) := rawtohex(RawData); begin return substr(HexData, 7, 2) || substr(HexData, 5, 2) || substr(HexData, 3, 2) || substr(HexData, 1, 2) || '-' || substr(HexData, 11, 2) || substr(HexData, 9, 2) || '-' || substr(HexData, 15, 2) || substr(HexData, 13, 2) || '-' || substr(HexData, 17, 4) || '-' || substr(HexData, 21, 12); end; END RAWTOGUID; </code></pre> <p>Adding in the following site:</p> <p><a href="http://dbaspot.com/oracle-server/69226-guid-char-conversion-function.html" rel="noreferrer">http://dbaspot.com/oracle-server/69226-guid-char-conversion-function.html</a></p> <p>Came up with this function to do the inverse:</p> <pre><code>create or replace FUNCTION GUIDTORAW ( HexData IN VARCHAR ) RETURN RAW AS BEGIN declare StringData varchar(32) := TRANSLATE(HexData,'0{-}','0'); begin return hextoraw(substr(StringData, 7, 2) || substr(StringData, 5, 2) || substr(StringData, 3, 2) || substr(StringData, 1, 2) || substr(StringData, 11, 2) || substr(StringData, 9, 2) || substr(StringData, 15, 2) || substr(StringData, 13, 2) || substr(StringData, 17, 4) || substr(StringData, 21, 12)); end; END GUIDTORAW; </code></pre> <p>They convert back and forth, but am I actually respecting the endianness or have the right order at all?</p>
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    1. COI have compared the results of the RAWTOGUID() function with using the .NET Guid.ToByteArray() method, inserting into Oracle as byte[], running RAWTOGUID() vs Guid.ToString() and received the same results. If you have tested that the GUIDTORAW() is indeed the reverse of RAWTOGUID() then it seems like the functions are both OK. I would, however, prefer to go over the spec of Guid's byte ordering and compare to that.
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    2. CORelated: http://stackoverflow.com/questions/7289734/convert-from-oracles-raw16-to-nets-guid and http://stackoverflow.com/questions/9195551/why-does-guid-tobytearray-order-the-bytes-the-way-it-does
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