Restarting a Roo-application flushes its correspondant MySQL-table

I've got a Roo-project. Its data is persisted into a MySQL-database (via Hibernate).

When I restart Tomcat the Roo-applications correspondant MySQL-table gets completely flushed. All data which is already in the table is deleted.

How can I keep the dat开发者_开发技巧a?

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Try to play with Hibernate's persistence settings ({project_root}/src/main/resources/META-INF/persistence.xml). There is the line:

        <!-- value="create" to build a new database on each run; value="update" 
            to modify an existing database; value="create-drop" means the same as "create" 
            but also drops tables when Hibernate closes; value="validate" makes no changes 
            to the database -->
        <property name="hibernate.hbm2ddl.auto" value="update" />

Set there validate.