criteria

This must be a simple question. Given a criteria, how one deletes the entities satisfying the criteria? The rationale: HQL and NH criteria are NHibernate specific constructs and as such they are server side DAL implementation details. I do not want them to "leak" to the client side. So, our client side provides LINQ expressions for the server to process. Up until now the requests where select requests and LINQ to NHibernate dealed with them just fine. However, there is a need to implement batch delete operation now. As usual, the client side provides a LINQ expression and the server is to

Using Hibernate 's Criteria API , I want to select the record within a table with the maximum value for a given column. I tried to use Projections , creating an alias for max(colunName) , then using it in restrictions.eq() , but it keeps telling me " invalid number ". What's the correct way to do that with Hibernate? You can use a DetachedCriteria to express a subquery, something like this: DetachedCriteria maxId = DetachedCriteria.forClass(Foo.class) .setProjection( Projections.max("id") ); session.createCriteria(Foo.class) .add( Property.forName("id").eq(maxId) ) .list(); References

写在前面 《Docker+SpringBoot+Mybatis+thymeleaf的Java博客系统开源啦》 由于开源了项目的缘故，很多使用了My Blog项目的朋友遇到问题也都会联系我去解决，有的是把问题留在项目的issue里提出，有的是在我的私人博客里留言，还有的则是直接添加我的qq来找我讲自己遇到的问题，有些问题比较简单直接就解决了，有些问题的解决记录也留在issue记录里，有些则是网上有相关教程，而剩下问题的解决方案，如果时间允许我都会单独的做一篇博客来解答。 问题描述 当时的聊天记录： 截图中提到的代码(节选): ContentVoMapper.xml: <sql id="Example_Where_Clause"> <where> <foreach collection="oredCriteria" item="criteria" separator="or"> <if test="criteria.valid"> <trim prefix="(" prefixOverrides="and" suffix=")"> <foreach collection="criteria.criteria" item="criterion"> <choose> <when test="criterion.noValue"> and ${criterion.condition} <

I need to use year() and month() functions in Criteria API to be able to express a business filter constrain. Expressions like cri.Add(Expression.Ge("year(Duration.DateFrom)", Year.Value)); cri.Add(Expression.Le("year(Duration.DateTo)", Year.Value)); obviously do not work - is there any solution how to achieve this? I know it's entirely possible in HQL, but I need to construct the query using criteria API because there're some additional processes processing the query adding sorting, paging etc.. sample HQL solution which I'd like to rewrite to Criteria API: var ym = year * 100 + month; var

I'm really new with Hibernate. I want a List<User> using hibernate criteria, but only with fields User id and name filled up. Is that possible? Something like the query shown below: SELECT user.id, user.name FROM user Regards. Matt Solnit This is exactly what projections are for. Here is an example: Criteria cr = session.createCriteria(User.class) .setProjection(Projections.projectionList() .add(Projections.property("id"), "id") .add(Projections.property("Name"), "Name")) .setResultTransformer(Transformers.aliasToBean(User.class)); List<User> list = cr.list(); In fact, if you look at the

I'm trying to get a report using Criteria and ProjectionList, and I'm pretty new using this through hibernate. So I have this model: private Long _userId; private Category _category; private Long _companyId; private Double _amount; private Date _date; And I building the query using this: public List sumPaymentsByUserCategoryPeriod(Category category, Long userId,Integer period){ GregorianCalendar from = new GregorianCalendar(); from.add(Calendar.MONTH, -period); List<CategoryAmount> resultDTO= new ArrayList<CategoryAmount>(); Criteria criteria = getSession().createCriteria(Payment.class);

I have been using Hibernate Restrictions in JPA 1.0 ( Hibernate driver ). There is defined Restrictions.ilike("column","keyword", MatchMode.ANYWHERE) which tests if the keyword matching the column anywhere and it is case-insensitive. Now, I am using JPA 2.0 with EclipseLink as driver so I have to use "Restrictions" build-in JPA 2.0. I found CriteriaBuilder and method like , I have also found out how to make it matching anywhere ( although it is aweful and manual ), but still I haven't figured out how to do it case-insensitive. There is my current aweful solution: CriteriaBuilder builder = em

HIbernate提供了以下几种检索对象的方式： ①、导航对象图检索方式：根据已经加载的对象，导航到其他对象。例如，对于已经加载的Customer对象，调用它的getOrders().iterator()方法就可以导航到所关联的Order对象。 ②、OID检索方式：按照对象的OID来检索对象，session的get()和load()方法提供了这种功能。如果在应用程序中事先知道了OID，就可以使用这种检索对象的方式。 ③、HQL检索方式：使用面向对象HQL查询语言，Hibernate提供的Query接口，它是Hibernate提供的专门的HQL查询接口，能够执行各种复杂的HQL查询语句。 ④、QBC检索方式：使用QBC（Query By Criteria）API来检索对象， ⑤、本地SQL检索方式。 ⑥、QBE检索方式：QBC的子功能。 一、Hibernate检索方式简介： 当直接使用JDBC API查询数据库时，必须在应用程序中嵌入冗长的SQL语句。 1、HQL检索方式(Hibernate Query Language) HQL是面向对象查询语言。 2、QBC检索方式（Query By Criteria） QBC API提供了检索对象的另一种方式，它主要是有Criteria接口、Criterion接口和Expression类组成，它支持在运行时动态生成查询语句。 3、QBE检索方式

今天呢，我就详细的写着 Hibernate框架的一种检索方式：Criteria查询。下面我写的这些案例，可能对于大牛没有什么好看的，但是对于初学者来说，却是一笔财富。 首先我们要知道的检索方式： Hibernate框架提供了5种检索对象的方式 1.导航对象图检索方式：根据已经加载的对象导航到其他对象 2.OID检索方式：按照对象的OID来检索对象 3.HQL检索方式：使用面向对象的HQL查询语言 4.QBC检索方式：使用QBC(Query By Criteria)API来检索对象，这种API封装了基于字符串形式的查询语句，提供了更加面向对象的查询接口 5.本地SQL检索方式：使用本地数据库的SQL查询语句 什么是Criteria Criteria是一种比hql更面向对象的查询方式。 Criteria 可使用 Criterion 和 Projection 设置查询条件。可以设置 FetchMode(联合查询抓取的模式 ) ，设置排序方式，Criteria 还可以设置 FlushModel （冲刷 Session 的方式）和 LockMode。 Criteria查询 就是 通过面向对象化的设计，将数据查询条件封装为一个对象 Criteria是一个接口，它继承了 另一个接口。 它里面有很多的方法，看图说话： 有了这些方法，我们可以再深度研究，这个方法里面的参数，有了什么接口或是类的类型