在没有hibernate_show_sql = true的情况下将Hql转换为Sql Query

Question

我正在执行以下HQL并且它正在执行

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

现在我也想在日志中记录后端生成的sql以供支持用户使用,我想利用QueryTranslator请指教如何为相应的HQL生成sql请告知如何实现这一点.

Answer 1

你可以使用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();

Answer 2

我相信你想要前两个答案的组合

  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();

Answer 3

您可以使用 unwrap 方法取出查询。

String queryString = query.unwrap(org.hibernate.Query.class).getQueryString();