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Using Extensions for Schema Generation [message #643054] Fri, 03 December 2010 18:39 Go to next message
Tilen Bobek is currently offline Tilen Bobek
Messages: 2
Registered: December 2010
Junior Member
Hello everyone!

In our project we want the tables in the database get generated/altered automaticaly when some entity changes and also get the SQL queries that did that. I read the tutorial for the EclipseLink JPA and found how to configure the persistence unit in persistence.xml to generate the database schema automaticaly (property "eclipselink.ddl-generation.output-mode" for schema generation and property "eclipselink.ddl-generation.output-mode" for generation of SQL scripts).

Is it possible to configure the persistence unit so that if only a field in the entity changes the whole table (or even database) is not getting dropped and recreated but the table get only altered for the changes (for example adding/deleting a column, modifying a relation)?

Thanks in advance.

Regards
Re: Using Extensions for Schema Generation [message #643359 is a reply to message #643054] Mon, 06 December 2010 15:53 Go to previous message
James Sutherland is currently offline James Sutherland
Messages: 1939
Registered: July 2009
Location: Ottawa, Canada
Senior Member

Altering an existing schema is not currently supported. You need to either replace the schema, or generate a script and change it yourself to use alter.

Please log an enhancement request for this.


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