从hibernate criteria 或者 HQL 得到 SQL

  
import java.lang.reflect.Field;
  
import java.util.Collections;

import org.hibernate.Criteria;
  
import org.hibernate.SessionFactory;
  
import org.hibernate.engine.SessionFactoryImplementor;
  
import org.hibernate.hql.QueryTranslator;
  
import org.hibernate.hql.QueryTranslatorFactory;
  
import org.hibernate.hql.ast.ASTQueryTranslatorFactory;
  
import org.hibernate.impl.CriteriaImpl;
  
import org.hibernate.impl.SessionImpl;
  
import org.hibernate.loader.OuterJoinLoader;
  
import org.hibernate.loader.criteria.CriteriaLoader;
  
import org.hibernate.persister.entity.OuterJoinLoadable;

public class HibernateHqlAndCriteriaToSqlTranslator
  
{
      
private SessionFactory sessionFactory;

public void setSessionFactory(SessionFactory sessionFactory)
      
{
	  
this.sessionFactory = sessionFactory;
      
}

public String toSql(Criteria criteria)
      
{
	  
try
	  
{
	      
CriteriaImpl c = (CriteriaImpl) criteria;
	      
SessionImpl s = (SessionImpl) c.getSession();
	      
SessionFactoryImplementor factory = (SessionFactoryImplementor) s.getSessionFactory();
	      
String[] implementors = factory.getImplementors(c.getEntityOrClassName());
	      
CriteriaLoader loader = new CriteriaLoader((OuterJoinLoadable) factory.getEntityPersister(implementors[0]), factory, c,
		      
implementors[0], s.getEnabledFilters());
	      
Field f = OuterJoinLoader.class.getDeclaredField("sql");
	      
f.setAccessible(true);
	      
return (String) f.get(loader);
	  
}
	  
catch (Exception e)
	  
{
	      
throw new RuntimeException(e);
	  
}
      
}

public String toSql(String hqlQueryText)
      
{
	  
if (hqlQueryText != null && hqlQueryText.trim().length() > 0)
	  
{
	      
final QueryTranslatorFactory translatorFactory = new ASTQueryTranslatorFactory();
	      
final SessionFactoryImplementor factory = (SessionFactoryImplementor) sessionFactory;
	      
final QueryTranslator translator = translatorFactory.createQueryTranslator(hqlQueryText, hqlQueryText,
		      
Collections.EMPTY_MAP, factory);
	      
translator.compile(Collections.EMPTY_MAP, false);
	      
return translator.getSQLString();
	  
}
	  
return null;
      
}
  
}