mybatis-Mysql like语句值不固定

mybatismysql

<code>    SELECT e.`ID`,e.`EmployeeID`,e.`CHNName`,e.`ENGName`,e.`Sex`,e.`Mobile`         FROM tb_pcm_coach c,tb_sys_employee e,tb_sys_employeetype tt, tb_sys_department d          WHERE c.ID=e.ID AND e.ID=tt.Employee AND e.dept = d.id        <!--  AND tt.EmployeeType='EB43871E-1E7C-48CB-B38D-9E3200D011F7}'-->        AND e.STATUS='FDCAAF7C-8FE8-4340-993E-9E29000B6F14'         <!--AND c.ID IN(SELECT coach FROM tb_mms_coachbuy) -->        <if test="employeetype != null and '' != employeetype">              and tt.EmployeeType= #{employeetype}        </if>        <if test="dept != null and '' != dept">              and INSTR(d.TreeKey, #{dept}) = 1        </if>        <if test="coachlevel != null and '' != coachlevel">              and c.CoachLevel= #{coachlevel}        </if>        <if test="eid != null and '' != eid">              and e.ID != #{eid}         </if>        <!-- Combobox精确查询 -->        <if test="CHNName != null and '' != CHNName">              and e.CHNName like '%#{CHNName}%'         </if>最下面like我想查e.CHNName包括传入的CHNName，也就是like的值不固定，请问应该怎么写？已解决，我从其他模块借鉴的<if test="departmentname != null and '' != departmentname">        and INSTR(d.departmentname,#{departmentname}) > 0</if>mysql中有一个方法 INSTR可以比对两个字符串。</code>