SQL:INSERT操作返回主键

<insert id="insert" parameterType="SubstituteOper" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    <selectKey resultType="java.lang.Long" order="BEFORE" keyProperty="substituteOperId">
     SELECT SEQ_SUBSTITUTE_OPER_ID.nextVal FROM DUAL
    </selectKey>
    insert into SUBSTITUTE_OPER (SUBSTITUTE_OPER_ID, CUST_ID, TEL_NUM,
      TERM_TYPE, CITY_ID, OBJ_TYPE,
      ACCESS_ID, ACCESS_OBJ_ID, STAFF_ID,
      OPER_DATE, CALL_TELNUM, TEMPLATE_ID,
      MSG_CONTENT, SEND_STS)
    values (#{substituteOperId,jdbcType=DECIMAL}, #{custId,jdbcType=DECIMAL}, #{telNum,jdbcType=DECIMAL},
      #{termType,jdbcType=CHAR}, #{cityId,jdbcType=VARCHAR}, #{objType,jdbcType=CHAR},
      #{accessId,jdbcType=CHAR}, #{accessObjId,jdbcType=DECIMAL}, #{staffId,jdbcType=DECIMAL},
      #{operDate,jdbcType=DATE}, #{callTelnum,jdbcType=VARCHAR}, #{templateId,jdbcType=DECIMAL},
      #{msgContent,jdbcType=VARCHAR}, #{sendSts,jdbcType=CHAR})
  </insert>

关键点自己找吧，很明显吧