mybatis+oracle添加一條數據並返回所添加數據的主鍵問題

最近做mybatis+oracle項目的時候解決添加一條數據並返回所添加數據的主鍵問題

controller層

@RequestMapping("/addplan")
    public @ResponseBody OnlineAddplanWithBLOBs insertOnlineAddplan(OnlineAddplanWithBLOBs plan) throws Exception{
         
　　　　 //plan是添加的數據,planid為數據主鍵，此時對象中主鍵為null int n = service.insertOnlineAddplan(plan);
    
　　　　 //獲取對象主鍵
        System.out.println("返回的主鍵值是"+plan.getPlanid()); 
        
        return plan;
    }

在mapperx.xml中

<insert id="insert" parameterType="com.online.pojo.OnlineAddplanWithBLOBs" >
    
    //獲取序列值，並賦值到對象的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)
　　//獲取上面對象中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>