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From Karen Koch <kmk...@sbcglobal.net>
Subject Re: resultClass for BLOB field
Date Mon, 18 Dec 2006 18:28:03 GMT
Yes, actually, I misspoke when I said I was decrypting the password.  There are times when
other data that I'm encrypting has to be decrypted in order to present it to the user (as
in user-defined challenge question to confirm identity in case they forgot their password)
or to pass on to a third party (as with credit card transaction processing), both over SSL,
but I don't actually bother to decrypt the password...

Thank you, though!

Nathan Maves <nathan.maves@gmail.com> wrote: Just a thought but you might want to think
about never decrypting a password.  I would just compare the two encrypted version.  

Just one extra safety step :)

On 12/18/06,  Clinton Begin <clinton.begin@gmail.com> wrote: 
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 above.


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,

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.  


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#

 Karen Koch




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