criteria

问题 I am writing a very simple query, but I am getting duplicate values for some reason. Criteria cr = session.createCriteria(ProcessInstance.class, "p") .add(Restrictions.isNull("end")); @Cleanup ScrollableResults sr = cr.scroll(ScrollMode.FORWARD_ONLY); while (sr.next()) { pi = (ProcessInstance) sr.get(0); String id = pi.getId(); //Getting duplicate values } The pi.getId() returns duplicate values. ie: *9,9,10,10,11,11 etc* However, running this query directly in mysql SELECT * FROM JBPM

问题 i have a hibernate query that is dynamically put together using the criteria api. it generates queries that are unbearably slow, if executed as-is. but i have noted they are about 1000% faster if I prepend /*+ FIRST_ROWS(10) */ to the query. how can i do this with the criteria api? i tried criteria.setComment(..), but this seems to be ignored. in the hibernate docs, 3.4.1.7. Query hints are mentioned, but it clearly states: "Note that these are not SQL query hints" the result of the query

问题 I have the following mapped classes Trade { ID, AccountFrom, AccountTo } Account {ID, Company} Company {ID} Now I cannot figure out a way select all trades where AccountFrom.Company.ID = X OR AccountTo.Company.ID = X I can get AND to work using the following: criteria.CreateCriteria("AccountFrom").CreateCriteria("Company").Add(Restrictions.Eq("ID", X); criteria.CreateCriteria("AccountTo").CreateCriteria("Company").Add(Restrictions.Eq("ID", X); But how can I transform this into an OR rather an

问题 Pretty simple explanation. I have a table with 10 entries, 5 entries with the year 2010 and 5 entries with 2011 in a column. In the query I have, I use Like *2010 to filter out all entries equal 2010 and display onl those records. On my form, I have combobox being populated with each unique year (from a different table). So my combobox values are 2010 and 2011. Is it possible, when I select say 2011, I trim the right 4 characters and use as my Like criteria to refresh and requery the form,

问题 The following criteria query calculates the average of rating of different groups of products. CriteriaBuilder criteriaBuilder=entityManager.getCriteriaBuilder(); CriteriaQuery<Tuple>criteriaQuery=criteriaBuilder.createQuery(Tuple.class); Metamodel metamodel=entityManager.getMetamodel(); EntityType<Product>entityType=metamodel.entity(Product.class); Root<Product>root=criteriaQuery.from(entityType); SetJoin<Product, Rating> join = root.join(Product_.ratingSet, JoinType.LEFT); Expression<Number

问题 I'm looking to create a Left outer join Nhibernate query with multiple on statements akin to this: SELECT * FROM [Database].[dbo].[Posts] p LEFT JOIN [Database].[dbo].[PostInteractions] i ON p.PostId = i.PostID_TargetPost And i.UserID_ActingUser = 202 I've been fooling around with the critera and aliases, but I haven't had any luck figuring out how do to this. Any suggestions? 回答1: I actually figured it out. You need to do a check for null .CreateCriteria("Interactions", "i", NHibernate

问题 I'm trying, as in title, to insert a subquery in select clause like in this simple SQL: SELECT id, name, (select count(*) from item) from item this is obviously only a mock query just to make my point. (The point would be to get the last invoice for each item returned by the query.) I've tried this: CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery<Tuple> c = cb.createTupleQuery(); Root<Item> item= c.from(Item.class); Subquery<Long> scount = c.subquery(Long.class); Root<Item>

问题 I have a large data sheet that I want to search in VBA based on 3 sets of criteria . Each row entry can be assumed to be unique. The format of the sheet/data itself cannot be changed due to requirements. (I've seen several posts on related questions but haven't found a working solution for this yet.) At first I used the classic VBA find method in a loop: Set foundItem = itemRange.Find(What:=itemName, Lookin:=xlValues, lookat:=xlWhole, SearchOrder:=xlByRows) If Not foundItem Is Nothing Then

问题 Does anyone have a good example for how to do a findByExample in JPA that will work within a generic DAO via reflection for any entity type? I know I can do it via my provider (Hibernate), but I don't want to break with neutrality... Seems like the criteria API might be the way to go....but I am not sure how to handle the reflection part of it. 回答1: Actually, Query By Example (QBE) has been considered for inclusion in the JPA 2.0 specification but is not included, even if major vendors

问题 I have list of category. I need a list of category by excluding 2,3 row. Can we achieve through hibernate by using Criteria and Restriction? 回答1: Your question is somewhat unclear. Assuming "Category" is a root entity and "2,3" are ids (or values of some property of the category") you can exclude them using the following: Criteria criteria = ...; // obtain criteria from somewhere, like session.createCriteria() criteria.add( Restrictions.not( // replace "id" below with property name, depending