last paintings when try to use app

I try to use jpa, why the data in my delete to get table, when I delete a class entity he drop of auto event table, why? I have create a match of one entity class column in mytable (before I have 8 columns) after I restore my project then my mytable get auto change and turn to a single column?

Hello

It happens because you set the property of eclipselink.ddl - generation of drop-and-create-tables, saying to drop and then re-create the tables each time you start/redeploy the application. It is a feature to contribute to development when modify you entities and therefore need to delete the previous tables so that they can be recreated with new fields. Your table could have only a field because the entity corresponding to the table only has a mapped field.
That is to say, check your persistence.xml for

See http://wiki.eclipse.org/Using_EclipseLink_JPA_Extensions _ (ELUG) #Using_EclipseLink_JPA_Extensions_for_Schema_Generation for more information on the different options of EclipseLink JPA.

Best regards
Chris

Tags: Fusion Middleware

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