或者通过Query接口进行参数填充 Query query = session.createQuery("from TUser user where user.name=? and user.age>?");query.setString(0,"Erica");quer.setInteger(1,20); 占位符 String sql=from TUser user where user.name=:name and user.age>:age";Query query=session.createQuery(hql);query...
String hql ="from User as user where user.name=?"; Query query = s.createQuery(hql); query.setString(0, name);//方法二:使用替代字符String hql ="from User as user where user.name=:name"; Query query = s.createQuery(hql); query.setString("name", name); 还有很多其他的setXxx方法,...
SQL : 采用 HQL 和 QBC 检索时, Hib 生成 SQL 语句适用所有数据库。 Query query =session.createSQLQuery("select {c.*} from customers c where like : customername " + "and c.age =:customerage","c",customer.calss); query.setString("customername","tom"); query.setInteger("customerage","...
In order to refer to the Cat in other parts of the query, you will need to assign analias. For example: from Cat as cat 1. This query assigns the alias cat to Cat instances, so you can use that alias later in the query. The ...
Hibernate SQL query is not the recommended approach because we loose benefits related to hibernate association andhibernate first level cache. I will use MySQL database and same tables and data setup as used inHQL example, so you should check out that first to understand the tables and correspon...
NHibernate is equiped with an extremely powerful query language that (quite intentionally) looks very much like SQL. But don't be fooled by the syntax; HQL is fully object-oriented, understanding notio ...
id="exampleHibernateProperties"class="org.springframework.beans.factory.config.PropertiesFactoryBean"><property name="properties"><props><prop key="hibernate.hbm2ddl.auto">update</prop><prop key="hibernate.dialect">net.sf.hibernate.dialect.DerbyDialect</prop><prop key="hibernate.query.substitu...
编写连接查询:使用Hibernate提供的查询语言(HQL)或Criteria API来编写连接查询。HQL是一种面向对象的查询语言,类似于SQL,但是操作的是实体类而不是数据库表。 下面是一个使用Hibernate进行连接查询的示例: 代码语言:txt 复制 // 定义实体类 @Entity @Table(name = "orders") public class Order { @Id @GeneratedV...
HQL中查的是对象而不是和表,并且支持多态;HQL主要通过Query来操作,Query的创建方式: Query q = session.createQuery(hql); hql 可以是类似下面的形式: from Person from User user where user.name=? from User user where user.name=:name and user.birthday < :birthday ...
适用情况:面向对象操作,革新了以前的数据库操作方式,易读。缺点:适用面较HQL有限。 三、QBE(Query By Example)例子查询方式 将一个对象的非空属性作为查询条件进行查询。 示例:Session session = SessionFactory.getCurrentSession(); User user = new User(); ...