criteria

I have a Dept table and a Emp table. I need to join these two table in such a way that the where clause looks something like this: where dept.deptId = emp.DeptId and dept.deptName = emp.empTrainingName I tried this: Criteria criteria = session.createCriteria(Dept.class).createAlias("empMap","id"); Using this, the first where condition i.e. dept.deptId = emp.DeptId is performed. But I am not sure how to compare dept.deptName with emp.empTrainingName . How do I do this using the Criteria API in NHibernate? Criteria criteria = session.createCriteria(Dept.class, "department") .createAlias("empMap"

I have a table in which certain words or word groups are stored. I want to select entries which start with an uppercase letter, cointain no space and contain only letters. My SQL looks like this: select word from words where w_id > 100 AND word REGEXP '^[A-Z][A-Za-z]*$' limit 2000; How do I do the same thing using criteria? user3487063 Try this: List words = session.createCriteria(Word.class) .setProjection(Projections.property("word")) .add(Restrictions.and(Restrictions.gt("w_id",100), Restrictions.sqlRestriction(word REGEXP '^[A-Z][A-Za-z]*$'))) .setMaxResults(2000).list(); 来源： https:/

I have a Person entity. Every person has a country, I want to select all the distinct countries that have people in them. This Criteria Query returns all the distinct CountryID's criteria.SetProjection(Projections.Distinct(Projections.Property("Country"))); How do I alter it to join and fetch the Country entity, not just the ID? Any easy way would be to use a subquery. That is, you could select the whole country on the outer query where the country ID matches the inner query. Subqueries.PropertyIn( "Country", innerDetachedCriteriaWhichFindsCountriesWithPeopleAndProjectsCountryId) 来源： https:/

How can I write the following SQL using Criteria: select b.Name as Batch, b.Capacity as Capecity, a.tStudent as Admit, (b.Capacity-a.tStudent) as Availabe from ( SELECT count(Id) as tStudent, BatchId FROM [dbo].[Student] group by BatchId) as a left join [dbo].[Batch] as b on a.BatchId = b.Id To use NHibernate, to produce query like this: SELECT ... FROM ( SELECT ... ) AS a .. We have to options: Map the sub-select as an Entity. create raw SQL query The first option would mean to create some view , and map it as an Entity. If we do not like view (or cannot create it) we can use the power of

Is it possible to perform a request that checks the string representation of a Date instance. For example Restrictions.like("dateField", "%12%") to retrieve dates that either have String 12 in day or 12 in month or 12 in year where "dateField" is an instance of java.util.Date Thanks I had the same problem and here's what I did: First, I created my own Criterion implementation: public class DateLikeExpression implements Criterion { private static final long serialVersionUID = 1L; private String propertyName; private String value; public DateLikeExpression(String propertyName, String value) {

由于以前没有接触过Hibernate而且近期又经常要用到，所以先在次记录下来以便以后的不时之需。 Hibernate支持符合java编写习惯的查询API，先通过Session简历一个 Hibernate 支持一种符合Java撰写习惯的查询API，使用Session建立一个Criteria对象，然后在不使用Sql甚至Hql的情况下对数据库进行查询。 以最基本的查询来说，如果您想要查询某个物件所对应的资料表中所有的内容，可以直接使用： Criteria criteria = session.createCriteria(T.class); List T= criteria.list(); 其中最经常用 Restrictions 的静态方法传回 criteria 实例 传回的每个Criteria实例代表着一个条件，另外还要使用 Criteria 的add方法加入这些条件实例。 Restrictions的几个常用限定查询方法如下表所示： 方法 说明 Restrictions.eq 等于 Restrictions.allEq 使用Map，使用key/value进行多个等于的比对 Restrictions.gt 大于 > Restrictions.ge 大于等于 >= Restrictions.lt 小于 < Restrictions.le 小于等于 <= Restrictions

主要由三种查询：HQL查询、Criteria条件查询、SQL查询。 以下分别讲解 1. HQL查询 HQL(Hibernate Query Language)查询提供了更加丰富和灵活的查询特性，因此Hibernate将HQL查询立为官方推荐的标准查询方式。 HQL语法与SQL相似，但HQL是一种面向对象的查询语言，操作的是类、实例和属性等。 HQL是完全面向对象的查询语言，支持继承和多态等特性。 HQL查询步骤 (1) 获得Hibernate Session对象 (2) 设计HQL查询语句 (3) 以HQL查询语句作为参数，调用Session.createQuery(hql)方法创建查询对象 (4) 如果HQL查询语句包含参数，调用Query的setXxxx()方法为参数赋值 (5) 调用Query对象的list等方法遍历查询结果 public class HqlQueryTest{ private void findStudents(){ SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory(); Session session = sessionFactory.openSession(); Transaction trans = session