criteria

问题 In oracle I have dates in format 17-April-2011 19:20:23.707000000 I would like to retrieve all orders for 17-04-2011. SimpleDateFormat formatter = new SimpleDateFormat(\"dd-MM-YYYY\"); String myDate = \"17-04-2011\"; Date date = formatter.parse(myDate); Criteria criteria = session.createCriteria(Order.class); Criterion restrictDate = Restrictions.like(\"orderDate\",date); but it brings me empty result: 回答1: Why do you use Restrictions.like(... )? You should use Restrictions.eq(...) . Note you

问题 I\'m trying to implement paging using row-based limiting (for example: setFirstResult(5) and setMaxResults(10) ) on a Hibernate Criteria query that has joins to other tables. Understandably, data is getting cut off randomly; and the reason for that is explained here. As a solution, the page suggests using a \"second sql select\" instead of a join. How can I convert my existing criteria query (which has joins using createAlias() ) to use a nested select instead? 回答1: You can achieve the

问题 Consider the following JPQL query: SELECT foo FROM Foo foo INNER JOIN FETCH foo.bar bar WHERE bar.baz = :baz I\'m trying to translate this into a Critieria query. This is as far as I have gotten: CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery<Foo> cq = cb.createQuery(Foo.class); Root<Foo> r = cq.from(Foo.class); Fetch<Foo, Bar> fetch = r.fetch(Foo_.bar, JoinType.INNER); Join<Foo, Bar> join = r.join(Foo_.bar, JoinType.INNER); cq.where(cb.equal(join.get(Bar_.baz), value); The

问题 I\'d like to use Hibernate\'s criteria api to formulate a particular query that joins two entities. Let\'s say I have two entities, Pet and Owner with a owner having many pets, but crucially that association is not mapped in the Java annotations or xml. With hql, I could select owners that have a pet called \'fido\' by specifying the join in the query (rather than adding a set of pets to the owner class). Can the same be done using hibernate criteria? If so how? Thanks, J 回答1: My

问题 is there an easy way to get the (to-be-generated) sql from a Hibernate Criteria? Ideally I would have something like: Criteria criteria = session.createCriteria(Operator.class); ... build up the criteria ... ... and then do something like ... String sql = criteria.toSql() (But this of course does not exist) The idea would then be to use the sql as part of a huge \'MINUS\' query (I need to find the differences between 2 identical schemas - identical in structure, not in data - and the MINUS is

问题 I am looking for a hibernate criteria to get following: Dokument.class is mapped to Role roleId Role.class has a ContactPerson contactId Contact.class FirstName LastName I want to search for First or LastName on the Contact class and retrieve a list of Dokuments connected. I have tried something like this: session.createCriteria(Dokument.class) .setFetchMode(\"role\",FetchMode.JOIN) .setFetchMode(\"contact\",FetchMode.JOIN) .add(Restrictions.eq(\"LastName\",\"Test\")).list(); I get an error

问题 What are the pros and cons of using Criteria or HQL? The Criteria API is a nice object-oriented way to express queries in Hibernate, but sometimes Criteria Queries are more difficult to understand/build than HQL. When do you use Criteria and when HQL? What do you prefer in which use cases? Or is it just a matter of taste? 回答1: I mostly prefer Criteria Queries for dynamic queries. For example it is much easier to add some ordering dynamically or leave some parts (e.g. restrictions) out