8.3. Improving schema DDL
Customizing the DDL in your Hibernate application is something you'll usually consider only when you generate the database schema with Hibernate's toolset. If a schema already exists, such customizations won't affect the runtime behavior of Hibernate.
You can export DDL to a text file or execute it directly on your database whenever you run your integration tests. Because DDL is mostly vendor-specific, every option you put in your mapping metadata has the potential to bind the metadata to a particular database product—keep this in mind when applying the following features.
We separate DDL customization into two categories:
Naming automatically generated database objects, such as tables, columns, and constraints explicitly ...
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