ibatis dynamic标签 的使用

<!-- 根据给定的参数查询出对应的对账日志记录 -->

    <select id="listByParamMap" parameterClass="java.util.Map" resultClass="AccCheckLog">

        select rl.ID as id,

               rl.STAFF_ID as staffId,

               rl.STAFF_NAME as staffName,

               rl.STAFF_PHONE_NUM as staffPhoneNum,

               rl.ORDER_ID as orderId,

               rl.AWARD_DATE as awardDate,

               rl.PAY_AMOUNT as payAmount,

               rl.ISSUER_ID as issuerId,

               rl.APPFROM as appfrom,

               rl.ISSUER_NAME as issuerName,

               rl.LOG_TIME as logTime,

               rl.TYPE as type,

               rl.COMMENTS as comments,

               rl.CHECK_RESULT_CODE as checkResultCode

          from INFO_AWARD_COUPON_RECORD_LOG rl

          <dynamic prepend="where">

                <isNotNull property="appfrom" prepend="and">

                        rl.APPFROM = #appfrom#

                </isNotNull>

                <isNotNull property="staffId" prepend="and">

                        rl.STAFF_ID = #staffId#

                </isNotNull>

                <isNotNull property="orderId" prepend="and">

                        rl.ORDER_ID = #orderId#

                </isNotNull>

                <isNotNull property="logTimeStart" prepend="and">

                        <![CDATA[rl.LOG_TIME >= to_date(#logTimeStart#,'yyyymmdd')]]>

                </isNotNull>

                <isNotNull property="logTimeEnd" prepend="and">

                        <![CDATA[rl.LOG_TIME <= to_date(#logTimeEnd#,'yyyymmdd')]]>

                </isNotNull>

                <isNotNull property="checkResultCode" prepend="and">

                        rl.CHECK_RESULT_CODE = #checkResultCode#

                </isNotNull>

                <isNotNull property="checkResultCodeNEq1" prepend="and">

                        rl.CHECK_RESULT_CODE != #checkResultCodeNEq1#

                </isNotNull>

          </dynamic>

    </select>

dynamic的prepend只要检测到第一个为“真”的条件比较元素(isNotNull标签)，则覆盖其prepend属性并组装where关键字为动态SQL的一部分.