How Can I Retrieve the SQL Query from a Hibernate Criteria API?

Retrieving SQL from Hibernate Criteria API: an alternative

While the toSql() method does not exist in the Criteria API, there is another approach you can take to get the SQL representing the query.

Customize Criteria to extract SQL

To extract the SQL, you need to access the internal representation of the criteria object. This includes:

1. Convert criteria to CriteriaImpl.
2. retrieves CriteriaImpl from SessionImplementor.
3. Gets SessionImplementor from SessionFactoryImplementor.
4. Creates CriteriaQueryTranslator based on input parameters.
5. Get the implementation class of the entity class.
6. Instantiate CriteriaJoinWalker with the necessary parameters.

Generate SQL

Once you have CriteriaJoinWalker, you can call the getSQLString() method to get the SQL representation of the query.

Code Example

The following example demonstrates the above steps:

<code class="language-java">CriteriaImpl criteriaImpl = (CriteriaImpl) criteria;
SessionImplementor session = criteriaImpl.getSession();
SessionFactoryImplementor factory = session.getFactory();
CriteriaQueryTranslator translator = new CriteriaQueryTranslator(factory, criteriaImpl, criteriaImpl.getEntityOrClassName(), CriteriaQueryTranslator.ROOT_SQL_ALIAS);
String[] implementors = factory.getImplementors(criteriaImpl.getEntityOrClassName());

CriteriaJoinWalker walker = new CriteriaJoinWalker((OuterJoinLoadable) factory.getEntityPersister(implementors[0]), translator, factory, criteriaImpl, criteriaImpl.getEntityOrClassName(), session.getLoadQueryInfluencers());

String sql = walker.getSQLString();</code>

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