hibernate3学习笔记(十)｜SQL支援

示例代码如下：

1. package com.hb3.pack_01;
2. 
   
3. import java.util.Iterator;
4. 
   
5. import org.hibernate.Query;
6. import org.hibernate.SQLQuery;
7. import org.hibernate.Session;
8. import org.hibernate.SessionFactory;
9. import org.hibernate.cfg.Configuration;
10. 
    
11. import com.hb3.pack_01.model.User;
12. 
    
13. public class BusinessService {
14. 
    
15.     public static void main(String[] args) {
16.         
17.         Configuration config = new Configuration().configure();
18.         SessionFactory sessionFactory = config.buildSessionFactory();      
19.         Session session = sessionFactory.openSession();
20.         
21.         String sql = "select {user.*} from User user where user.age > ?";
22.         SQLQuery sqlQuery = session.createSQLQuery(sql);
23.         sqlQuery.setParameter(0, 20);
24.         sqlQuery.addEntity("user", User.class);
25.         Iterator<?> iterator = sqlQuery.list().iterator();
26.         while(iterator.hasNext()) {
27.             User user = (User) iterator.next();
28.             System.out.println(user.getAge() + "\t" + user.getName());
29.         }
30.         
31.         Query query = session.getNamedQuery("com.hb3.pack_01.model.User.SQLQueryUser");
32.         query.setInteger("age", 20);
33.         iterator = query.list().iterator();
34.         while(iterator.hasNext()) {
35.             User user = (User) iterator.next();
36.             System.out.println(user.getAge() + "\t" + user.getName());
37.         }
38. 
    
39.         session.close();
40.         sessionFactory.close();
41.     }
42. }

修改User.hbm.xml文件如下：

1. <?xml version="1.0" encoding="UTF-8"?>
2. 
   
3. <!DOCTYPE hibernate-mapping PUBLIC
4.     "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
5.     "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
6. 
   
7. <hibernate-mapping>
8.     <class name="com.hb3.pack_01.model.User" table="user" 
9.         dynamic-insert="true" 
10.         dynamic-update="true"   
11.     >
12.         <id name="id" column="id" type="java.lang.Integer" unsaved-value="null">
13.             <generator class="native" />
14.         </id>
15.         
16.         <property name="name" column="name" type="java.lang.String" />
17.         
18.         <property name="age" column="age" type="java.lang.Integer" />
19.     </class>
20.     
21.     <query name="com.hb3.pack_01.model.User.QueryUser">
22.         <![CDATA[             
23.             from User as user where user.age > :minAge        
24.         ]]>
25.     </query>
26.     
27.     <sql-query name="com.hb3.pack_01.model.User.SQLQueryUser">
28.         <![CDATA[            
29.             select {user.*} from User user where user.age > :age
30.         ]]>        
31.         <return alias="user" class="com.hb3.pack_01.model.User"/>
32.     </sql-query>
33.     
34. </hibernate-mapping>

运行结果：

17:20:40,859  WARN ConfigurationFactory:127 - No configuration found. Configuring ehcache from ehcache-failsafe.xml  found in the classpath: jar:file:/D:/Java/MyEclipse%206.0/workspace/hb3demo/ehcache-1.2.3.jar!/ehcache-failsafe.xml
17:20:41,281  WARN EhCacheProvider:93 - Could not find configuration [org.hibernate.cache.UpdateTimestampsCache]; using defaults.
17:20:41,312  WARN EhCacheProvider:93 - Could not find configuration [org.hibernate.cache.StandardQueryCache]; using defaults.
Hibernate: select user.id as id0_0_, user.name as name0_0_, user.age as age0_0_ from User user where user.age > ?
28 shenbin
24 chenyan
23 shenyi
23 yangye
22 chenyong
Hibernate: select user.id as id0_0_, user.name as name0_0_, user.age as age0_0_ from User user where user.age > ?
28 shenbin
24 chenyan
23 shenyi
23 yangye
22 chenyong

 

另外，我们还可以自定义insert、update、delete时的SQL文而不使用Hibernate3自动生成的SQL文。

修改User.hbm.xml文件如下：

1. <?xml version="1.0" encoding="UTF-8"?>
2. 
   
3. <!DOCTYPE hibernate-mapping PUBLIC
4.     "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
5.     "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
6. 
   
7. <hibernate-mapping>
8.     <class name="com.hb3.pack_01.model.User" table="user" 
9.         dynamic-insert="true" 
10.         dynamic-update="true"   
11.     >
12.         <id name="id" column="id" type="java.lang.Integer" unsaved-value="null">
13.             <generator class="native" />
14.         </id>
15.         
16.         <property name="name" column="name" type="java.lang.String" />
17.         
18.         <property name="age" column="age" type="java.lang.Integer" />
19.     
20.         <sql-insert>
21.             <!-- INSERT INTO user (name, age) VALUES (?, ?) -->
22.             INSERT INTO user VALUES (?, ?)   
23.         </sql-insert>
24.         <sql-update>
25.             UPDATE user SET name=?, age=?, WHERE id=?        
26.         </sql-update>
27.         <sql-delete>
28.             DELETE FROM user WHERE id=?        
29.         </sql-delete>
30.         
31.     </class>
32.     
33.     <query name="com.hb3.pack_01.model.User.QueryUser">
34.         <![CDATA[             
35.             from User as user where user.age > :minAge        
36.         ]]>
37.     </query>
38.     
39.     <sql-query name="com.hb3.pack_01.model.User.SQLQueryUser">
40.         <![CDATA[            
41.             select {user.*} from User user where user.age > :age
42.         ]]>        
43.         <return alias="user" class="com.hb3.pack_01.model.User"/>
44.     </sql-query>
45.     
46. </hibernate-mapping>

示例代码：

1. package com.hb3.pack_01;
2. 
   
3. import org.hibernate.Session;
4. import org.hibernate.SessionFactory;
5. import org.hibernate.Transaction;
6. import org.hibernate.cfg.Configuration;
7. 
   
8. import com.hb3.pack_01.model.User;
9. 
   
10. public class BusinessService {
11. 
    
12.     public static void main(String[] args) {
13.         
14.         Configuration config = new Configuration().configure();
15.         SessionFactory sessionFactory = config.buildSessionFactory();      
16.         Session session = sessionFactory.openSession();
17. 
    
18.         User user = new User();
19.         user.setName("yanfeng");
20.         user.setAge(21);
21.         Transaction tx = session.beginTransaction();
22.         session.save(user); 
23.         tx.commit(); 
24.         
25.         session.close();
26.         sessionFactory.close();
27.     }
28. }

测试结果如下：

17:29:03,781  WARN ConfigurationFactory:127 - No configuration found. Configuring ehcache from ehcache-failsafe.xml  found in the classpath: jar:file:/D:/Java/MyEclipse%206.0/workspace/hb3demo/ehcache-1.2.3.jar!/ehcache-failsafe.xml
17:29:04,328  WARN EhCacheProvider:93 - Could not find configuration [org.hibernate.cache.UpdateTimestampsCache]; using defaults.
17:29:04,359  WARN EhCacheProvider:93 - Could not find configuration [org.hibernate.cache.StandardQueryCache]; using defaults.
Hibernate: insert into user (name, age) values (?, ?)

 

可见，在实行保存操作时的SQL确实是我们在配置文件中定义的SQL文。

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