Hibernate+Spring操作oracle的BLOG(CLOB)数据

    系统采用的是HIBERNATE+SPRING进行数据的操作,开始一直采用HIBERNATE进行数据库的直连,用SPRING对ORACLE对BLOG字段进行处理,这两天打算采用PROXOOL对数据源进行管理,访问数据都没有问题,可对数据进行SAVEORUPDATE的时候报错如下:

 

occour a unkonw error from actionlocation OracleLobCreator needs to work on [oracle.jdbc.OracleConnection], not on [oracle.jdbc.internal.OracleConnection$$EnhancerByProxool$$10e3032b]: specify a corresponding NativeJdbcExtractor; nested exception is java.lang.ClassCastException: oracle.jdbc.internal.OracleConnection$$EnhancerByProxool$$10e3032b 

 

想着应该是nativejdbcextractor的原因,在网上找了不少资料,终于搞明白了,原来在用SPRING配置处理BLOB(CLOB)字段时,不同版本的数据库,其NATIVEJDBCEXTRACTOR是不同的,我们用的是10G的数据,但原来的配置是 

 

<bean id="nativeJdbcExtractor" class="org.springframework.jdbc.support.nativejdbc.SimpleNativeJdbcExtractor" /> 

    <bean id="oracleLobHandler" class="org.springframework.jdbc.support.lob.OracleLobHandler" lazy-init="true"> 

        <property name="nativeJdbcExtractor"> 

            <ref bean="nativeJdbcExtractor" /> 

        </property> 

    </bean> 

 

这种配置的方法是针对9i的,因为Oracle9i处理Clob的方式和别的数据库很不一样,甚至与Oracle10g都不兼容。 

所以，正确的配置应该是 

 

<bean id="oracleLobHandler" class="org.springframework.jdbc.support.lob.DefaultLobHandler" lazy-init="true"/> 

 

 

轻松搞定，网上这方面的资料较少，真得在实际工作中慢慢积累经验呀：） 

 

至于SPRING操作BLOG（CLOB）的方法，网上讲的较多，就不多说了，呵呵。加载PROXOOL与是相对比较容易的 

hibernate.config.xml配置段如下： 

<property name="dialect">org.hibernate.dialect.Oracle9Dialect</property> 

<property name="hibernate.proxool.pool_alias">dbpool</property> 

<property name="hibernate.proxool.xml">proxool.xml</property> 

<property name="hibernate.connection.release_mode">auto</property> 

<property name="hibernate.cglib.use_reflection_optimizer">true</property> 

<property name="connection.provider_class">org.hibernate.connection.ProxoolConnectionProvider</property> 

<property name="hibernate.show_sql">false</property> 

<property name="hibernate.connection.autocommit">true</property> 

 

proxool.xml如下： 

 

<?xml version="1.0" encoding="utf-8"?> 

<!-- the proxool configuration can be embedded within your own application's. 

Anything outside the "proxool" tag is ignored. --> 

<something-else-entirely> 

  <proxool> 

    <alias>dbpool</alias> 

    <driver-url>jdbc:oracle:thin:@dbip:1521:orcl</driver-url> 

    <driver-class>oracle.jdbc.driver.OracleDriver</driver-class> 

    <driver-properties> 

      <property name="user" value="user"/> 

      <property name="password" value="pass"/> 

    </driver-properties> 

    <house-keeping-sleep-time>90000</house-keeping-sleep-time> 

    <prototype-count>5</prototype-count> 

    <maximum-connection-count>100</maximum-connection-count> 

    <minimum-connection-count>10</minimum-connection-count> 

  </proxool> 

</something-else-entirely>