转-Spring + Hibernate + Oracle9i中使用Clob

背景

在信息发布系统中，如果需要将用户发布的信息保存到Oralcle9i数据库中，使用varchar2(4000)有时是不够用的，因为除了用户录入的内容还要加上html编辑器附加的html标识，所以我建议使用clob。

动手

其实也挺简单的：两个配置、两个注意

1、hbm配置

<hibernate-mapping>        <class name="com.wonders.pubinfo.bean.LawInfo" table="JZ_LAW_INFO">               <id column="ID" name="id" type="java.lang.String">                      <generator class="uuid.hex"/>               </id>               <property column="TYPE" length="4" name="type" type="java.lang.String"/>               <property column="TITLE" length="200" name="title" type="java.lang.String"/>               <property column="KEYWORD" length="200" name="keyword" type="java.lang.String"/>               <property column="CONTENT" name="content" type="org.springframework.orm.hibernate.support.ClobStringType"/>               <property column="PUBLISH_TIME" length="23" name="publishTime" type="java.sql.Timestamp"/>               <property column="PRACTICE_TIME" length="23" name="practiceTime" type="java.sql.Timestamp"/>               <property column="END_TIME" length="23" name="endTime" type="java.sql.Timestamp"/>               <property column="FILE_NUM" length="50" name="fileNum" type="java.lang.String"/>               <property column="PUB_ORGAN" length="50" name="pubOrgan" type="java.lang.String"/>               <property column="TEMPLATE" length="20" name="template" type="java.lang.String"/>               <property column="VALIDITY" length="1" name="validity" type="java.lang.String"/>               <property column="HTML_FILE" length="50" name="htmlFile" type="java.lang.String"/>        </class> </hibernate-mapping>

2、application配置

<beans>        <!--**** Start of PERSISTENCE DEFINITIONS ****--> <bean id="placeholderConfig" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">     <property name="location">       <value>init.properties</value>     </property> </bean> <!-- JDBC Connection --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">     <property name="driverClassName">       <value>${datasource.driverClassName}</value>     </property>     <property name="url">       <value>${datasource.url}</value>     </property>     <property name="username">       <value>${datasource.username}</value>     </property>     <property name="password">       <value>${datasource.password}</value>     </property>     <property name="maxActive">       <value>${datasource.maxActive}</value>     </property>     <property name="maxIdle">       <value>${datasource.maxIdle}</value>     </property>     <property name="maxWait">       <value>${datasource.maxWait}</value>     </property>     <property name="defaultAutoCommit">       <value>${datasource.defaultAutoCommit}</value>     </property> </bean> <!--**** OracleLobHandler ****--> <bean id="oracleLobHandler" class="org.springframework.jdbc.support.lob.OracleLobHandler">               <property name="nativeJdbcExtractor">                      <ref local="nativeJdbcExtractor"/>               </property> </bean>        <bean id="nativeJdbcExtractor" class="org.springframework.jdbc.support.nativejdbc.SimpleNativeJdbcExtractor"></bean>               <!--**** SessionFactory Definition ****-->        <bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean">               <property name="dataSource">                      <ref local="dataSource" />               </property>               <property name="lobHandler">                      <ref bean="oracleLobHandler" />               </property>               <property name="mappingResources">                      <list>                             <value>com\wonders\pubinfo\bean\LawInfo.hbm.xml</value>                             <value>com\wonders\pubinfo\bean\LawType.hbm.xml</value>                      </list>               </property>               <property name="hibernateProperties">                      <props>                             <prop key="hibernate.dialect">${hibernate.dialect}</prop>                             <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>                             <prop key="hibernate.jdbc.fetch_size">${hibernate.jdbc.fetch_size}</prop>                             <prop key="hibernate.jdbc.batch_size">${hibernate.jdbc.batch_size}</prop>                      </props>               </property>        </bean> </beans>

3、注意

（1）、注意红色字体部分，就是你要配置的；在引用spring类的地方，注意查看一下你使用的spring包中有的做相应修改。

（2）、注意使用的NativeJdbcExtractor一定要使用datasource对应的NativeJdbcExtractor，就是使用用jdbc连接，不要用容器提供连接，不然会报如下错误：

OracleLobCreator needs to work on [oracle.jdbc.OracleConnection], not on [class com.ibm.ws.rsadapter.jdbc.WSJdbcConnection] - specify a corresponding NativeJdbcExtractor

4、bean中的clob字段使用String类型

public class LawInfo implements Serializable {        ...        private String content;        ...        public String getContent() {               return content;        }        public void setContent(String content) {               this.content = content;        }        ...    }