How Can I Access the Underlying SQL Query Generated by Hibernate Criteria API?

Unlocking Hibernate Criteria API's SQL Secrets

Hibernate's Criteria API simplifies database interactions, but accessing the underlying SQL it generates can be tricky. This guide provides a workaround to retrieve this essential information.

The Solution:

To extract the SQL query from a Hibernate Criteria object, follow these steps:

1. Obtain the CriteriaImpl object from your original Criteria instance.
2. Access the SessionImplementor from the CriteriaImpl object.
3. Retrieve the SessionFactoryImplementor from the SessionImplementor.
4. Create a CriteriaQueryTranslator for the CriteriaImpl, specifying the criteria's ROOT_SQL_ALIAS.
5. Obtain all implementors of the criteria's target entity from the SessionFactoryImplementor.
6. Construct a CriteriaJoinWalker using these parameters:
   • The target entity's root OuterJoinLoadable
   • The CriteriaQueryTranslator from step 4
   • The SessionFactoryImplementor from step 3
   • The original CriteriaImpl
   • The name of the criteria's target entity
   • The LoadQueryInfluencers from the current session.
7. Finally, call getSQLString() on the CriteriaJoinWalker to retrieve the SQL string.

This method allows direct manipulation of the generated SQL, enabling advanced operations like the MINUS query you might need.

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