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help! perhaps the problems of configuration of JDBC on Weblogic

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I'm using Oracle+Weblogic+JBuilder, I got a very strange problem. When I use PreparedStatement to pass parameters to query data, I cannot get the data, it always throws ObjectNotFoundException. But if I use Statement to query data, it works.
for example.
//Policy: a table in Oracle Database
String sql = "select * from policy where id='""'";
//this works
//but for this
String sql = "select * from policy where id=?";
PreparedStatement ps = con.createPreparedStatement(sql);
//it throws ObjectNotFoundException
any help would be appreciated!
thanx in advance
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I assume you meant to say:

and is of type String?

And what is throwing ObjectNotFoundException? - this would not be thrown by any of the above code, but by an entity bean finder method.
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