DDL generation and general persistence.xml settings (OpenJPA)

Question

Summary

I\'m trying to run a Java web application JPA 2.0 example. The example application was written to run in Glassfish, using

Answer 1

If you add the openjpa.jdbc.SynchronizeMappings property as shown below OpenJPA will auto-create all your tables, all your primary keys and all foreign keys exactly to match your objects

<property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/>

Alternatively, you can use EclipseLink in TomEE by just adding the EclipseLink jars to <CATALINA_HOME>/lib/

refer here for Common PersistenceProvider properties

Answer 2

Foreign key constraints

The next line does not create foreign keys:

<property name="openjpa.jdbc.SynchronizeMappings" 
          value="buildSchema(ForeignKeys=true)"/>

Only creates schema and deletes content of a database.

But if you want create foreign keys, use the following lines:

<property name="openjpa.jdbc.SynchronizeMappings" 
          value="buildSchema(foreignKeys=true,schemaAction='dropDB,add')"/>
<property name="openjpa.jdbc.SchemaFactory" 
          value="native(foreignKeys=true)" />
<property name="openjpa.jdbc.MappingDefaults" 
          value="ForeignKeyDeleteAction=restrict, JoinForeignKeyDeleteAction=restrict"/>

See generated SQL

In another way, if you want to see the SQL output:

<property name="openjpa.Log" 
          value="DefaultLevel=TRACE,SQL=TRACE" />

_{NOTE: In order to see the generated output in the TomEE console, you need to change the log level in the file loggin.properties with openjpa.level = FINEST}

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See more in http://openjpa.apache.org/faq.html