ibatis动态语句加and 和不加and

<select id="queryGoodsGroupCodeName" parameterClass="String" resultClass="codeTextBean">

          SELECT L4_GDS_GROUP_CD CODE,L4_GDS_GROUP_DESC NAME FROM DM_GDS_GROUP_INF_TD

          <dynamic prepend="WHERE">

            <isNotEmpty property="value" prepend="AND">

                   (L4_GDS_GROUP_CD LIKE ‘%$value$%‘ OR L4_GDS_GROUP_DESC LIKE ‘%$value$%‘)

            </isNotEmpty>

        </dynamic>

      </select>

<select id="queryCategoryCodeName" parameterClass="String" resultClass="codeTextBean">

        select HR_DEPT_CD code, DEPT_NM name from dw_rpt.DM_DEPT_TD

        <dynamic prepend="WHERE">

            <isNotEmpty property="value">

                   (HR_DEPT_CD LIKE ‘%$value$%‘ OR DEPT_NM LIKE ‘%$value$%‘)

            </isNotEmpty>

        </dynamic>

      </select>

第一条查询语句添加了：prepend="AND"，第二条没添加，发现在isNotEmpty属性中是否添加：prepend="AND"   都能运行。

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