使用hibernate3和Spring解决Oracle大字段(长文本)问题
使用Oracle来存储长文本始终没Mysql来的方便,Mysql不用特殊配置直接使用java.lang.String来存储Text 字段内容即可。这里可以看出Mysql的优势了吧。^-^
很久之前在网上找了些,加上自己摸索的，应该算是很简单的了。
来个总结备案。
步骤：
1。使用Clob类型来存储长文本。
2。在你的Spring的applicationContext-hibernate.xml里配置以下两个bean.
<bean id="nativeJdbcExtractor" class="org.springframework.jdbc.support.nativejdbc.SimpleNativeJdbcExtractor"/>
<bean id="oracleLobHandle" class="org.springframework.jdbc.support.lob.OracleLobHandler" Lazy-init="true">
<property name="nativeJdbcExtractor">
<ref local="nativeJdbcExtractor"/>
</property>
</bean>
3。在有clob类型sessionFactory(org.springframework.com.hibernate.LocalSessionFractoryBean)中加入
<property name="lobHandler"><ref bean="oracleLobHandle"/></property>
4。在*.hbm文件里使用长文本的字段加上对应的Java类型。
<property name="content" type="org.springframework.orm.hibernate3.support.ClobStringType" column="TRACK_CONTENT" length="100000"/>
5。上边的这个content,即JavaBean的对应的属性类型为String，不是ClobStringType。
如果只配置到这里的话，启动应用的时候会报缺少事务支持的错误，忘了具体报什么错了。
6。所以要给save,remove方法加上事务支持。
<bean id="txProxyTemplate" abstract="true"
class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
<property name="transactionManager"><ref bean="transactionManager"/></property>
<property name="transactionAttributes">
<props>
<prop key="save*">PROPAGATION_REQUIRED</prop>
<prop key="remove*">PROPAGATION_REQUIRED</prop>
<prop key="*">PROPAGATION_REQUIRED,readOnly</prop>
</props>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory"><ref bean="sessionFactory"/></property>
</bean>
<bean id="cnProjectTrackManager" parent="txProxyTemplate">
<property name="target">
<bean class="com.helloworld.cn.manager.project.bl.impl.ProjectTrackManagerImpl">
<property name="projectTrackDAO"><ref bean="cnProjectTrackDAO"/></property>
</bean>
</property>
</bean>
7。结束。
下边是配置所需的3个文件。
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<!
DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="txProxyTemplate" abstract="true"
class
="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
<property name="transactionManager"><ref bean="transactionManager"/></property>
<property name="transactionAttributes">
<props>
<prop key="save*">PROPAGATION_REQUIRED</prop>
<prop key="remove*">PROPAGATION_REQUIRED</prop>
<prop key="*">PROPAGATION_REQUIRED,readOnly</prop>
</props>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory"><ref bean="sessionFactory"/></property>
</bean>
<bean id="cnProjectTrackManager" parent="txProxyTemplate">
<property name="target">
<bean class="com.helloworld.cn.manager.project.bl.impl.ProjectTrackManagerImpl">
<property name="projectTrackDAO"><ref bean="cnProjectTrackDAO"/></property>
</bean>
</property>
</bean>
<!--
bean id="jtaTransactionManager" class="org.springframework.transaction.jta.JtaTransactionManager"> <property name="sessionFactory"><ref bean="sessionFactory"/></property> </bean-->
<!--
bean id="cnProjectTrackManager" class="com.helloworld.cn.manager.project.bl.impl.ProjectTrackManagerImpl"> <property name="projectTrackDAO"><ref bean="cnProjectTrackDAO"/></property> </bean-->
</beans>
applicationContext-hibernate.xml
<?xml version="1.0" encoding="UTF-8"?>
<!
DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!-- bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean" -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource"><ref bean="dataSource"/></property>
<property name="mappingResources">
<list>
<value>/hbm.ProjectTrack.xml</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<!-- prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop-->
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle9Dialect</prop >
<!-- prop key="hibernate.dialect">net.sf.hibernate.dialect.MySQLDialect</prop -->
<!-- prop key="hibernate.hbm2ddl.auto">update</prop -->
<prop key="hibernate.show_sql">true</prop>
<!-- prop key="hibernate.jdbc.batch_size">0</prop-->
<prop key="hibernate.use_outer_join">true</prop>
<!-- prop key="hibernate.query.factory_class">org.hibernate.hql.classic.ClassicQueryTranslatorFactory</prop -->
</props>
</property>
<property name="lobHandler"><ref bean="oracleLobHandle"/></property>
</bean>
<bean id="oracleLobHandle" class="org.springframework.jdbc.support.lob.OracleLobHandler" lazy-init="true">
<property name="nativeJdbcExtractor">
<ref local="nativeJdbcExtractor"/>
</property>
</bean>
<bean id="nativeJdbcExtractor" class="org.springframework.jdbc.support.nativejdbc.SimpleNativeJdbcExtractor"/>
<bean id="cnProjectTrackDAO" class="com.helloworld.cn.manager.project.dao.hibernate.ProjectTrackDAOHibernate">
<property name="sessionFactory"><ref bean="sessionFactory"/></property>
</bean>
</beans>
hbm.ProjectTrack.xml
<?xml version="1.0"?>
<!
DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.vitamin.cn.manager.project.entity.ProjectTrack" dynamic-update="false"
dynamic-insert="false" table="VITAMIN_CN_PROJECT_TRACK" lazy="false">
<id name="id" column="TRACK_ID" type="java.lang.Long" unsaved-value="null">
<!--
generator for mysql <generator class="native"> </generator> -->
<!-- generator for oracle -->
<generator class="sequence">
<param name="sequence">SEQ_CN_PROJECT_TRACK</param>
</generator>
</id>
<many-to-one name="project" column="PROJECT_ID"/>
<property name="date" type="java.util.Date" column="TRACK_DATE" />
<property name="editor" type="java.lang.String" column="TRACK_EDITOR" />
<property name="content" type="org.springframework.orm.hibernate3.support.ClobStringType" column="TRACK_CONTENT" length="100000"/>
<property name="name" type="java.lang.String" column="TRACK_NAME" />
</class>
</hibernate-mapping>