}//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]...
Query query = session.createSQLQuery("select * from CUSTOMERS as c where c.CUSTOMER_NAME like :CUSTOMER_NAME and c.CUSTOMER_ID=:CUSTOMER_ID"); // 动态绑定参数 query.setString("CUSTOMER_NAME","zhangsan"); query.setInteger("CUSTOMER_ID",2); // 执行检索 List result = query.list(); Ite...
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
②@Table(name="iiit_projects")注解表示Project对象映射的关系型数据库表是iiit_projects。 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。
mysql> select * from EMPLOYEE; +---+---+---+---+ | id | first_name | last_name | salary | +---+---+---+---+ | 29 | Zara | Ali | 5000 | | 31 | John | Paul | 10000 | +---+---+---+---+ 2 rows in set (0.00 sec mysql> Print Page Previous Next Adverti...
* 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...
第11 章 Hibernate查询语言(Query Language), 即HQL Hibernate装备了一种极为有力的查询语言,(有意地)看上去很像SQL。但是别被语法蒙蔽,HQL是完全面向对象的,具备继承、多态和关联等特性。 11.1. 大小写敏感性(Case Sensitivity) 除了Java类和属性名称外,查询都是大小写不敏感的。 所以,SeLeCT和sELEct以及SELECT相...
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...
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, ...