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 batchingat 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//businesswriteLog();}<!-- Spring-hibernate.xml --><bean id="nativeJdbcExtractor"  /><bean id="lobHandler"  />  </property></bean>    <bean id="sessionFactory" /><!-- 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] requiredat 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