Ibtis的where子句问题

最近遇到sql语句在pl/sql里能查出数据,但直接放到ibatis配置文件里却查询结果为空,语句为:
      select p.* from t_petitionletter p join t_processflow f on p.processflow = f.id where f.flowstate = '办理'

发现 ibatis不支持直接在配置文件里写where子句,需要使用ibatis的动态where子句标签

<select id="selectPetitionLetterForFlow" resultMap="PetitionLetterResult" parameterClass="string">
  	select p.* from t_petitionletter p join t_processflow f on p.processflow = f.id 
  	<dynamic prepend="where">
  		<isNotEmpty prepend="and">
  		f.flowstate = #flowstate#
  		</isNotEmpty>
  	</dynamic>
  </select>

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