mybatis--choose-when-then

<if test="@Ognl@isNotEmpty(enName)">
            <choose>
                <when test="@Ognl@isNotEmpty(exactMatchZhFlag) and exactMatchZhFlag =='1' ">
                    and a.en_name=#{enName}
                </when>
                <otherwise>
                    and a.en_name like CONCAT('%',#{enName},'%')
                </otherwise>
            </choose>

        </if>