Re: hibernate query question ?

From:

Jacqui <jasnook@ntlworld.com>

Newsgroups:

comp.lang.java.programmer

Date:

Wed, 25 Aug 2010 03:21:12 -0700 (PDT)

Message-ID:

<d36d11ae-9e9d-42ac-95b0-76af221c9f2c@q1g2000yqg.googlegroups.com>

On 24 Aug, 12:34, mike <m...@mail.com> wrote:

On 24.8.2010. 10:52, Jacqui wrote:

On 24 Aug, 09:22, mike<m...@mail.com> wrote:

I have two entities like this

public class FirstEntity{

private SecondEntity second;
....

}

public class SecondEntity{

private String name;

},

and on web I have a bean that looks like ;

public class Bean{

private FirstEntity first;

}

and I do a select like "select first from FirstEntity first left join
fetch first.second", and i set the result to a bean on the web. Jspx
part has inputText ="#{bean.first.second.name}". My problem is what =

when

FK to second entity is null(what can be the case), than jspx breaks=

.. Is

there any way to check if query doesn't find SecondEntity(FK) , that
than it creates new SecondEntity
so jspx can render.Thanks in advance.

I assume that the JSP is calling a getter method and if so, can't you
do something like this in the FirstEntity class:

public SecondEntity getSecondEntity() {
   if (secondEntity == null) {
     secondEntity = new SecondEntity();
   }
   return secondEntity;
}

Cheers,
Jacqui

I was thinking of that also, but some other projects use SecondEntity
class, and I don't know how will this change have impact on their project=

s.

Ok - it always gets complicated when multiple projects are using the
same code :-)

This is probably not the best, but the best I can come up with without
suggesting you dig into the code for the other projects - add a new
method called e.g., getSecondEntityDefaultIfNull() then put code above
in this and in the JSP call
inputText ="#{bean.first.secondEntityDefaultIfNull.name}"

If you can't change the source for SecondEntity the only other option
I can think of is to put an if statement in the JSP (which will make
it a bit messy unfortunately).