bind 标签

 <select >

       select * from course where 1=1

       <if test="_parameter!=null and  _parameter!=''">

               and name like #{_parameter}

       </if>

    </select>

    <select >

     <bind name="pattern" value="'%' + _parameter.name + '%'" />

       select * from course where 1=1

       <if test="_parameter.name!=null and  _parameter.name!=''">

               and name like #{pattern}

       </if>

    </select>