使用Spring解决CLOB字段的存取

使用Spring解决CLOB字段的存取,记录一下,以备后用zzzzzzz...
首先使用网络上提供较多的解决办法,如下配置

<prop key="hibernate.connection.SetBigStringTryClob">true</prop>
<property name="context" type="text" column="context" />
private String context;//getter & setter 然后直接save BO ：报错		
Caused by: java.sql.SQLException: 不允许的操作: streams type cannot be used in batching
	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
	at oracle.jdbc.driver.OraclePreparedStatement.addBatch(OraclePreparedStatement.java:4073)
	at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.addBatch(DelegatingPreparedStatement.java:172)
	at org.hibernate.jdbc.BatchingBatcher.addToBatch(BatchingBatcher.java:53)
	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2275)
	... 67 more

网友介绍，可以配置，<prop key="hibernate.jdbc.batch_size">0</prop>解决上述异常；系统里到处是批量提交，此方法不可取；
还有介绍：先保存CLOB字段为空，第二次update，却遇到CLOB类型转换异常；感觉挺麻烦，继续google[切换关键字组合]；

下面是成功简单解决办法

writeLog() ，调用者要声明事物,没必要把writeLog放到一个独立事物里（PROPAGATION_REQUIRES_NEW）或放到嵌套事物里；
	saveXXX(){ --<prop key="save*">PROPAGATION_REQUIRED</prop>即可
		//business
		writeLog();
	}
	<!-- Spring-hibernate.xml -->
	<bean id="nativeJdbcExtractor"
			  class="org.springframework.jdbc.support.nativejdbc.CommonsDbcpNativeJdbcExtractor"
			  lazy-init="true" />
	<bean id="lobHandler"
			  class="org.springframework.jdbc.support.lob.OracleLobHandler"
			  lazy-init="true">
		  <property name="nativeJdbcExtractor">
		   		<ref local="nativeJdbcExtractor" />
		  </property>
	</bean>	
    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="dataSource"><ref bean="dataSource"/></property>
		<property name="lobHandler"><ref bean="lobHandler"/></property>
		....
	</bean>
	<!--BO.hbm.xml-->
	<property name="context"
			type="org.springframework.orm.hibernate3.support.ClobStringType"
			column="context" />
	<!-- BO.java-->
	private String context; //getter & setter 然后就可以使用Hibernate保存BO：OK

如果不配置事物，会报下列异常

//Spring 处理CLOB，未配置事物
Caused by: java.lang.IllegalStateException: Active Spring transaction synchronization or active JTA transaction with specified [javax.transaction.TransactionManager] required
	at org.springframework.jdbc.support.lob.LobCreatorUtils.registerTransactionSynchronization(LobCreatorUtils.java:79)
	at org.springframework.orm.hibernate3.support.AbstractLobType.nullSafeSet(AbstractLobType.java:185)
	at org.hibernate.type.CustomType.nullSafeSet(CustomType.java:169)

文章引用： http://space.itpub.net/10714335/viewspace-167565
环境：用jdk1.6.0_21+apache-tomcat-6.0.29+ojdbc14.jar+oracle10_db