Mark,在使用hibernate处理视图的时候。因为视图没有主键,这个用Myeclipse自动生成的POJO类就有两个。一个类名.java,一个是类名Id.java,而映射文件只有一个。因此造成一个问题是,只要视图中有一个字段有一个为NULL,你查出来的数据就会为NULL。
解决办法:
只要把hibernate逆向生成的文件修改一下即可,直接把视图当成数据库表使用,当然视图是不能插入数据的。
如:
反向生成的xml文件:
<?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 Persistence Tools --> <hibernate-mapping> <class name="com.aircondition.store.pojo.VStockchanpin" table="v_stockchanpin" catalog="aircondition"> <composite-id name="id" class="com.aircondition.store.pojo.VStockchanpinId"> <key-property name="id" type="java.lang.String"> <column name="id" length="50" /> </key-property> <key-property name="spid" type="java.lang.String"> <column name="spid" length="50" /> </key-property> <key-property name="spmc" type="java.lang.String"> <column name="spmc" length="100" /> </key-property> <key-property name="spsl" type="java.lang.Integer"> <column name="spsl" /> </key-property> <key-property name="ggxh" type="java.lang.String"> <column name="ggxh" length="100" /> </key-property> <key-property name="spdm" type="java.lang.String"> <column name="spdm" length="100" /> </key-property> <key-property name="xgr" type="java.lang.String"> <column name="xgr" length="50" /> </key-property> <key-property name="sfsc" type="java.lang.String"> <column name="sfsc" length="10" /> </key-property> <key-property name="xgsj" type="java.util.Date"> <column name="xgsj" length="10" /> </key-property> </composite-id> </class> </hibernate-mapping>
修改成(把复合主键改成主键,把key-property属性改成property属性):
<?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 Persistence Tools --> <hibernate-mapping> <class name="com.aircondition.store.pojo.VStockchanpin" table="v_stockchanpin" catalog="aircondition"> <id name="id" type="java.lang.String"> <column name="id"></column> <generator class="guid"></generator> </id> <property name="spid" type="java.lang.String"> <column name="spid" length="50" /> </property> <property name="spmc" type="java.lang.String"> <column name="spmc" length="100" /> </property> <property name="spsl" type="java.lang.Integer"> <column name="spsl" /> </property> <property name="ggxh" type="java.lang.String"> <column name="ggxh" length="100" /> </property> <property name="spdm" type="java.lang.String"> <column name="spdm" length="100" /> </property> <property name="xgr" type="java.lang.String"> <column name="xgr" length="50" /> </property> <property name="sfsc" type="java.lang.String"> <column name="sfsc" length="10" /> </property> <property name="xgsj" type="java.util.Date"> <column name="xgsj" length="10" /> </property> </class> </hibernate-mapping>
相应的pojo也修改一下,直接把XXX.java删除,把带XXXId.java改成XXX.java即可。override的equal方法和hashcode方法,也可删除。
hibernate处理视图问题(记录)
时间: 2024-12-10 07:51:57