How to Retrieve SQL Queries from the Hibernate Criteria API in Hibernate 6?

How can I obtain the SQL queries generated from the Hibernate Criteria API in Hibernate 6?

CriteriaBuilder criteriaBuilder = session.getCriteriaBuilder();
CriteriaQuery<MyEntity> criteriaQuery = criteriaBuilder.createQuery(MyEntity.class);
Root<MyEntity> root = criteriaQuery.from(MyEntity.class);
criteriaQuery.select(root);
List<MyEntity> results = session.createQuery(criteriaQuery).getResultList();
// To see the SQL generated, enable logging for SQL

To obtain the SQL queries generated by the Hibernate Criteria API in Hibernate 6, you can leverage Hibernate's built-in logging functionality. By configuring your application to log SQL statements, you can see the actual SQL being executed against the database.

// Hibernate configuration example for enabling SQL logging in 'hibernate.cfg.xml'
<property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.use_sql_comments">true</property>
<property name="hibernate.hbm2ddl.auto">update</property>

Causes

• Missing proper logging configuration.
• Not using the appropriate session or transaction management.
• Misunderstanding how the Criteria API builds queries.

Solutions

• Enable SQL logging in your Hibernate configuration by setting the appropriate logging properties.
• Use `org.hibernate.SQL` logger to view executed queries.
• Modify log level for debugging to observe the query generation process.

Mistake: Not enabling SQL logging in Hibernate configuration.

Solution: Ensure that you have the `hibernate.show_sql` property set to `true`.

Mistake: Overlooking session transaction handling which affects query outputs.

Solution: Always use a valid session and manage transactions correctly, using either JPA or Hibernate's Session API.