@RequestMapping("/addplan")    public @ResponseBody OnlineAddplanWithBLOBs insertOnlineAddplan(OnlineAddplanWithBLOBs plan) throws Exception{         
　　　　 //plan是添加的数据,planid为数据主键，此时对象中主键为null        int n = service.insertOnlineAddplan(plan);    
　　　　 //获取对象主键        System.out.println("返回的主键值是"+plan.getPlanid());                 return plan;    }

<insert id="insert" parameterType="com.online.pojo.OnlineAddplanWithBLOBs" >        //获取序列值，并赋值到对象的planid字段    <selectKey keyProperty="planid" resultType="DECIMAL" order="BEFORE">              select online_sequence.nextval from dual      </selectKey>        insert into ONLINE_ADDPLAN (PLANID, COMPLETETIME, PERSON,       OPERATION, USERNAME, EVENTNODE,       WORKPLAN, CHENGGUOMIAOSHU)
　　//获取上面对象中planid字段的值    values (#{planid,jdbcType=DECIMAL}, #{completetime,jdbcType=TIMESTAMP}, #{person,jdbcType=VARCHAR},       #{operation,jdbcType=VARCHAR}, #{username,jdbcType=VARCHAR}, #{eventnode,jdbcType=CLOB},       #{workplan,jdbcType=CLOB}, #{chengguomiaoshu,jdbcType=CLOB})  </insert>