Caroline Jen wrote:
The Java "types" of the properties in my form bean
sometimes are not the same as those of the data fields
in my database.
The request.getParameter(); always return a String. I
can use the copyProperties() method of the BeanUtils
to convert all the String(s) read from the web page to
proper Java "types" in my form bean.
What do I do when the property type in my form bean
does not match the data field type in my POJO bean?
You need to convert it manually... what if you have a foreign key
relationship from your database? How is Struts supposed to know about
that? What if it's a many-to-many relationship? Should Struts give you
a list of IDs, or a list of foreign entities with all properties? You
need to code this kind of relationship in the way you set up your form
and process a form submission. You need to figure out a way to do the
database entity->form data (key(s)=value) and form data submission
(key(s)=value)->database entity. Your primary candidates of a form
submission are going to be a String or a String[]. The reason why
Struts doesn't give you java.lang.Long, or any other class is because
you can't confidently trust the values you get from a form submission
(clients can submit whatever they want, due to the disconnected nature
of the net). From the look of your question, you might want to have a
look at request.getParameterValues(), which returns a String[] (for
multi-select lists, multiple checkboxes, etc.).
HTH
- Scott
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