hibernet的缓存和级联

 

[java] view plaincopyprint?

1. <?xml version="1.0" encoding="utf-8"?> 
2. <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
3. "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 
4. <!--  
5.     Mapping file autogenerated by MyEclipse - Hibernate Tools 
6. --> 
7. <hibernate-mapping> 
8.     <class name="hibernate.bean.PxDept" table="px_dept" schema="dbo" 
9.         catalog="test"> 

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!-- Mapping file autogenerated by MyEclipse - Hibernate Tools--><hibernate-mapping><class name="hibernate.bean.PxDept" table="px_dept" schema="dbo"catalog="test">

Java代码

1.         <cache region="read-write"/>  
2.          <id name="deptId" type="integer">  
3.             <column name="dept_id" />  
4.             <generator class="identity" />  
5.         </id>  
6.         <many-to-one name="pxDept"class="hibernate.bean.PxDept" 
7.             insert="false" update="false">  
8.             <column name="parent_id" />  
9.         </many-to-one>  
10.         <property name="parentDeptId" type="integer">  
11.             <column name="parent_id" />  
12.         </property>  
13.         <property name="deptName" type="string" >  
14.             <column name="dept_name" length="256" not-null="true" />  
15.         </property>  
16. <set name="pxEmployees" inverse="true"  cascade="delete" batch-size="8" lazy="true">  
17.             <cache usage="read-write"/>  
18.             <key>  
19.                 <column name="dept_id" not-null="true" />  
20.             </key>  
21.             <one-to-many class="hibernate.bean.PxEmployee" />  
22.         </set>  
23.     </class>  
24. </hibernate-mapping>  
25. 我使用以下查询: 

[java] view plaincopyprint?

1.         <cache region="read-write"/> 
2.          <id name="deptId" type="integer"> 
3.             <column name="dept_id" /> 
4.             <generator class="identity" /> 
5.         </id> 
6.         <many-to-one name="pxDept" class="hibernate.bean.PxDept" 
7.             insert="false" update="false"> 
8.             <column name="parent_id" /> 
9.         </many-to-one> 
10.         <property name="parentDeptId" type="integer"> 
11.             <column name="parent_id" /> 
12.         </property> 
13.         <property name="deptName" type="string" > 
14.             <column name="dept_name" length="256" not-null="true" /> 
15.         </property> 
16. <set name="pxEmployees" inverse="true"  cascade="delete" batch-size="8" lazy="true"> 
17.             <cache usage="read-write"/> 
18.             <key> 
19.                 <column name="dept_id" not-null="true" /> 
20.             </key> 
21.             <one-to-many class="hibernate.bean.PxEmployee" /> 
22.         </set> 
23.     </class> 
24. </hibernate-mapping> 
25. 我使用以下查询: 

<cache region="read-write"/> <id name="deptId" type="integer"><column name="dept_id" /><generator class="identity" /></id><many-to-one name="pxDept" class="hibernate.bean.PxDept"insert="false" update="false"><column name="parent_id" /></many-to-one><property name="parentDeptId" type="integer"><column name="parent_id" /></property><property name="deptName" type="string" ><column name="dept_name" length="256" not-null="true" /></property><set name="pxEmployees" inverse="true"  cascade="delete" batch-size="8" lazy="true"><cache usage="read-write"/><key><column name="dept_id" not-null="true" /></key><one-to-many class="hibernate.bean.PxEmployee" /></set></class></hibernate-mapping>我使用以下查询:

Java代码

1. (1)List list = session.createQuery("from PxDept as p1 left join fetch p1.pxEmployees").setCacheable(true).list(); 

[java] view plaincopyprint?

1. (1)List list = session.createQuery("from PxDept as p1 left join fetch p1.pxEmployees").setCacheable(true).list(); 

(1)List list = session.createQuery("from PxDept as p1 left join fetch p1.pxEmployees").setCacheable(true).list();

Java代码

1. (2)list = session.createQuery("from PxDept as p1 left join fetch p1.pxEmployees").setCacheable(true).list(); 

[java] view plaincopyprint?

1. (2)list = session.createQuery("from PxDept as p1 left join fetch p1.pxEmployees").setCacheable(true).list(); 

(2)list = session.createQuery("from PxDept as p1 left join fetch p1.pxEmployees").setCacheable(true).list();

Java代码

1. 在(2)中的list结果是从缓存中取的,但里边PxDept对象中的关联对象pxEmployees集合是空的 

[java] view plaincopyprint?

1. 在(2)中的list结果是从缓存中取的,但里边PxDept对象中的关联对象pxEmployees集合是空的 

在(2)中的list结果是从缓存中取的,但里边PxDept对象中的关联对象pxEmployees集合是空的

Java代码

1. 下面我面又另一种方式: 

[java] view plaincopyprint?

1. 下面我面又另一种方式: 

下面我面又另一种方式:

Java代码

1. 将PxDept.hbm.xml中的关联关系改下 

[java] view plaincopyprint?

1. 将PxDept.hbm.xml中的关联关系改下 

将PxDept.hbm.xml中的关联关系改下

Java代码

1. <set name="pxEmployees" inverse="true"  cascade="delete" batch-size="8" lazy="false">  
2.             <cache usage="read-write"/>  
3.             <key>  
4.                 <column name="dept_id" not-null="true" />  
5.             </key>  
6.             <one-to-many class="hibernate.bean.PxEmployee" />  
7.         </set> 

[java] view plaincopyprint?

1. <set name="pxEmployees" inverse="true"  cascade="delete" batch-size="8" lazy="false"> 
2.             <cache usage="read-write"/> 
3.             <key> 
4.                 <column name="dept_id" not-null="true" /> 
5.             </key> 
6.             <one-to-many class="hibernate.bean.PxEmployee" /> 
7.         </set> 

<set name="pxEmployees" inverse="true"  cascade="delete" batch-size="8" lazy="false"><cache usage="read-write"/><key><column name="dept_id" not-null="true" /></key><one-to-many class="hibernate.bean.PxEmployee" /></set>

Java代码

1. lazy="false" 

[java] view plaincopyprint?

1. lazy="false" 

lazy="false"

Java代码

1. <PRE class=java name="code">(1)List list = session.createQuery("from PxDept as p1 left join fetch p1.pxEmployees").setCacheable(true).list();</PRE>  
2. <PRE class=java name="code">(2)list = session.createQuery("from PxDept as p1 left join fetch p1.pxEmployees").setCacheable(true).list();</PRE>  
3. <PRE class=java name="code">这会在(2)中的list 中的pxDept中的pxEmployees集合就有数据了,请问 这什么怎么回事???  
4. </PRE>