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From "Clinton Begin" <clinton.be...@gmail.com>
Subject Re: resultClass for BLOB field
Date Mon, 18 Dec 2006 17:11:05 GMT
Sorry Karen, I messed up in my explanation. I didn't fully read your SQL or
your mapping.

You can't do it directly like that.  This is one of the few (perhaps the
only?) type that iBATIS can't return directly.  You'll need to create a
class that has a byte[] property, "Password" for example.  Since you're
doing a number of operations for encryption and transformation from string
to binary types, a Password class might be useful anyway.

If you're in control of this database, I always recommend storing such
things as hex in a CHAR or VARCHAR field, rather than binary. That way you
could just map it to a string.  It's way easier to deal with in every way,
its no less secure and it's probably faster.

If you're not in control of the database, you'll need to do as I suggested


On 12/18/06, Karen Koch <kmkoch@sbcglobal.net> wrote:
> Re: your comments, Clinton, the field is not huge, and I just want to grab
> a stored encrypted password in order to decrypt it and compare to the
> user-entered password (part of a login procedure).
> Now, my latest problem: substituting "byte[]" in for the resultClass
> yields a java.lang.ClassNotFoundException exception for byte[].  (I forgot
> to mention having already attempted that.)
> <select id="getEncryptedPassword" resultClass="byte[]"
> parameterClass="string">
>         SELECT Password FROM EPLoginAccount WHERE EmailAddr = #value#
> Perhaps I'm not familiar with how to return an array from a statement.  A
> bit of help?
> Thanks again,
> Karen
> *Clinton Begin <clinton.begin@gmail.com>* wrote:
> Right.  We don't make use of the JDBC Blob/Clob classes.  So you have to
> use a byte[] (byte array).
> However, if your BLOB is huge, you might want to stream it directly to
> disk, or even directly to the browser.  In this case you'll want to bypass
> iBATIS, as it likely doesn't make sense to map huge data structures to
> anything resident in memory.
> Cheers,
> Clinton
> On 12/18/06, Karen Koch <kmkoch@sbcglobal.net> wrote:
> >
> > Hello --
> >
> > I think this is a simple one:  What is the proper resultClass to use
> > when returning only a single column (of BLOB type) as the result of a
> > statement?  SqlMaps doesn't seem to like "BLOB".
> >
> >  <select id="getEncryptedPassword" resultClass=???
> > parameterClass="string">
> >         SELECT Password FROM EPLoginAccount WHERE EmailAddr = #value#
> >  </select>
> >
> > Thanks!
> > Karen Koch
> >

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