How to convert HQL to SQL Query programmatically (without logging)

Question

I am executing the following HQL and it is executing properly

String hql = "FROM Employee";
Query query = session.createQuery(hql);
List results = query.list();

Now, I also want to log the sql generated at the backend in logs for support users.

I want to make use of QueryTranslator please advise how can I generate the sql for the corresponding HQL please advise how to achieve this.

Solution 1

You can use hibernate QueryTranslator:

String hqlQueryString = hqlQuery.getQueryString();
ASTQueryTranslatorFactory queryTranslatorFactory = new ASTQueryTranslatorFactory();
SessionImplementor hibernateSession = entityManager.unwrap(SessionImplementor.class);
QueryTranslator queryTranslator = queryTranslatorFactory.createQueryTranslator("", hqlQueryString, java.util.Collections.EMPTY_MAP, hibernateSession.getFactory());
queryTranslator.compile(java.util.Collections.EMPTY_MAP, false);
String sqlQueryString = queryTranslator.getSQLString();

Solution 2

I believe you want a combination of the top 2 answers

  String hqlQueryString = query.unwrap(org.hibernate.Query.class).getQueryString();
  ASTQueryTranslatorFactory queryTranslatorFactory = new ASTQueryTranslatorFactory();
  SessionImplementor hibernateSession = em.unwrap(SessionImplementor.class);
  QueryTranslator queryTranslator = queryTranslatorFactory.createQueryTranslator("", hqlQueryString, java.util.Collections.EMPTY_MAP, hibernateSession.getFactory());
  queryTranslator.compile(java.util.Collections.EMPTY_MAP, false);
  String sqlQueryString = queryTranslator.getSQLString();

Solution 3

This is also possible with TypedQuery in later versions of Hibernate using the following code

String hqlQueryString=typedQuery.unwrap(org.hibernate.query.Query.class).getQueryString();
        ASTQueryTranslatorFactory queryTranslatorFactory = new ASTQueryTranslatorFactory();
        SessionImplementor hibernateSession = entityManager.unwrap(SessionImplementor.class);
        QueryTranslator queryTranslator = queryTranslatorFactory.createQueryTranslator("", hqlQueryString, java.util.Collections.EMPTY_MAP, hibernateSession.getFactory(), null);
        queryTranslator.compile(java.util.Collections.EMPTY_MAP, false);
        String sqlQueryString = queryTranslator.getSQLString();

Solution 4

I found next solution on the web:

QueryTranslatorFactory translatorFactory = new ASTQueryTranslatorFactory();
SessionFactoryImplementor factory = (SessionFactoryImplementor) getSessionFactory();
QueryTranslator translator = translatorFactory.
        createQueryTranslator(hqlQueryText, hqlQueryText, Collections.EMPTY_MAP, factory);
translator.compile(Collections.EMPTY_MAP, false);
translator.getSQLString(); 

Source: http://narcanti.keyboardsamurais.de/hibernate-hql-to-sql-translation.html

Solution 5

This works, other answers have a problem for modern versions of hibernate:

String hqlQueryString = query.unwrap(org.hibernate.Query.class).getQueryString();
ASTQueryTranslatorFactory queryTranslatorFactory = new ASTQueryTranslatorFactory();
SessionImplementor hibernateSession = entityManager.unwrap(SessionImplementor.class);
QueryTranslator queryTranslator = queryTranslatorFactory.createQueryTranslator("", hqlQueryString, java.util.Collections.EMPTY_MAP, hibernateSession.getFactory(), null);
queryTranslator.compile(java.util.Collections.EMPTY_MAP, false);
String sqlQueryString = queryTranslator.getSQLString();

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