Can I get the SQL string from a JPA Query object?

Question

May I know how can I get the sql from a JPA query? or let\'s say, convert the JPA query to a SQL string? Thank you very much!

Answer 1

Following Karol's answer - It is possible to retrieve the SQL before executing the statement in EclipseLink :

Session session = em.unwrap(JpaEntityManager.class).getActiveSession();
DatabaseQuery databaseQuery = query.unwrap(EJBQueryImpl.class).getDatabaseQuery();
databaseQuery.prepareCall(session, new DatabaseRecord());
Record r = databaseQuery.getTranslationRow();
String bound = databaseQuery.getTranslatedSQLString(session, r);
String sqlString = databaseQuery.getSQLString();

To retrieve the SQL String During/After execution it is probably best to do so using persistence properties rather than in-code :

<property name="eclipselink.logging.parameters" value="true"/>
<property name="eclipselink.logging.level" value="FINE"/>

Answer 2

For Eclipselink: you can extract the SQL the following way:

query.unwrap(EJBQueryImpl.class).getDatabaseQuery().getSQLString()

It works only after the query has been executed.