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From "Rick Ross" <>
Subject <sql:param> null weirdness
Date Sun, 17 Aug 2003 06:11:58 GMT
I wonder if I am not understanding EL properly...

I have a form

    <input type="text" name="time" />
    <input type="submit" name="submit" />

and then a nice sql update to catch the form

    INSERT INTO myTable VALUES ( ? )
    <sql:param value="${param.time}" />

The problem comes when the form parameter is empty.  Since the actual database field is a
mySQL TIME field, there is a very big difference between an empty string and a null.  Empty
strings will be converted into '00:00:00' in the database but nulls will just stay null (nulls
are allowed and no defaults are specified). 

The sql:param tag will never return a null if there is a "time" key in the params.  Since
the form always posts the parameter, I'll always have '&time=&somethingelse='  in
my request.  <sql:param> sees this as an empty string "", which becomes '00:00:00' in
my database.   

This however, works:
<sql:param><c:out value="${param.time}" /></sql:param>

I am assuming that this is an intentional thing, but I'm not sure and I'd like to know why.




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