}//分组查询按书籍分类查询每个组的书的数量//查询列必须是分组列或聚合列@TestpublicvoidtestGroup(){String hql="select count(*),b.category.name from Book b group by b.category.name";List<Object[]> list =session.createQuery(hql).list();for(Object[] temp:list){ System.out.println(temp[0]...
Hibernate supports a sophisticated Criteria and Example query feature (QBC and QBE). You can also express your query in the native SQL of your database, with optional support
<sql-query name="getUserById2"> <![CDATA[select * from User where ]]> </sql-query> --> </hibernate-mapping> 2、在java代码中写入: static List namedQuery(int id) { Session s = HibernateUtil.getSession(); Query q = s.getNamedQuery("getUserById"); q.setInteger("id", id); retur...
If you check your EMPLOYEE table, it should have the following records − mysql> select * from EMPLOYEE; +---+---+---+---+ | id | first_name | last_name | salary | +---+---+---+---+ | 29 | Zara | Ali | 5000 | | 31 | John | Paul | 10000 | +---+---+--...
③@NamedQuery(name="Projects.findAll",query="SELECT f FROM Project f ORDER BY f.name",hints=@QueryHint(name="org.hibernate.cacheable",value="true"))表示调用Projects.findAll方法时将使用后面的SQL查询语句。 ④@Cacheable表明对象采用缓存模式。
String sql = "SELECT * FROM my_table WHERE id = :id"; Query query = session.createNativeQuery(sql, MyEntity.class); query.setParameter("id", 1L); List<MyEntity> results = query.getResultList(); 3. 更新Hibernate版本 如果可能的话,考虑升级到Hibernate的最新稳定版本,以解决可能的兼容...
* include many-to-one and one-to-one associations in Query By Example (QBE) * queries. association class</a> */ publicclassAssociationExampleimplementsCriterion { privatefinalObjectentity; privatefinalSetexcludedProperties=newHashSet(); privatePropertySelectorselector; privatebooleanisLikeEnabled; priva...
The property names are the names of properties of entities listed in the FROM path of the incorporated SELECT query. Given below is an example of copying users to a purged table before actually purging them : Query query=session.createQuery("insert into purged_accounts(id, code, status) "+...
The example uses two entitiesEmployeeandDepartment. An employee belongs to one department, where one department can have many employees. @Entity@Table(name="tbl_employee")@NamedNativeQueries({@NamedNativeQuery(name="getEmployeesByDeptId",query="SELECT e.id, e.firstName, e.lastName, e.email, ...
jpa 是 Java Persistence API的简称,是 javaEE 的 orm 规范,spring-data-jpa 是依照 jap 规范的关于数据持久层的一系列接口,在 spring 中是这样介绍 data-jpa 的:spring-data-jpa 是 spring 数据持久层的一部分,能够更轻松方便实现基于 JPA 的库,更容易构建出 spring 应用。说白了,spring-data-jpa 让我们...