How Can Hibernate Automatically Create or Update Database Tables from Entity Classes?

Automatically Creating or Updating Database Tables Using Hibernate Entity Classes

Question:

How can I configure Hibernate to automatically create or update database tables based on defined entity classes?

Context:

You have created an entity class, ServerNode, and defined a persistence unit in persistence.xml. You also have a script to persist an instance of ServerNode. However, the target database does not yet contain any tables.

Solution:

To enable Hibernate's automatic table creation or update, follow these steps:

1. In your persistence.xml file, locate the property hibernate.hbm2ddl.auto.

   For example:

   <property name="hibernate.hbm2ddl.auto" value="create" />

2. Set the value of hibernate.hbm2ddl.auto to one of the following:

   • create: Creates tables during sessionFactory creation and leaves them intact.
   • create-drop: Creates tables during sessionFactory creation and drops them when the sessionFactory closes.

3. (Optional) To explicitly specify the table name, use the javax.persistence.Table annotation in your entity class.

   For example:

   @Entity
   @Table(name = "ServerNodes")
   public class ServerNode {
       // ...
   }

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