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POHow to modify Hibernate's auto-generated running serial number?
 

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    <p>I am using <strong>Hibernate</strong> (JPA) with <strong>Derby database</strong> - my app server is <strong>Jboss 6.0</strong>. I have to pre-populate a table with 50000 employee info and for that I have used a standalone JDBC program. Now from my application I also need to insert new employee info on fly, in the same table and at that time I use <strong>JPA</strong> (since it runs within app container).</p> <p>My Employee class is an Entity bean and has "<strong>Id</strong>" column being primary key with "<strong>@GeneratedValue(strategy = auto)</strong>" annotation so that Hibernate figures out the appropriate running serial no for the primary key (i.e. Id column).</p> <p>Now the problem is Hibernate always starts this running serial from "1" even if the Employee table already has entries. Thus from application when I try to insert a new record using <strong><em>Entitymanager::persist()</em></strong>, I always get <strong>constrain violation</strong> error like "<em>duplicate key value in a unique or primary key constraint or unique index</em>". This is because hibernate tries to insert the new entry with <strong>Id =1</strong> where as I already have an entry in that table with Id = 1.</p> <p>My question is </p> <p>a) how can I update Hibernate'e cache so that my running serial number for "Id" column can be accordingly adjusted? I understand it will vary from DB to DB - but is it possible <strong>at all</strong>?</p> <p>b) Is there any other way to achieve the same?</p> <p>c) If I write a standalone JPA program to do the bulk insert (i.e. pre population) and then start my Jboss application, will hibernate be able to determine the right "running serial" no?</p> <p>Thanks in advance for any suggestion, - kuntal </p>
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