Mybaits 查询 choose when 的使用

@Select("<script>"+
                              "SELECT * " +
                              "FROM bgs_housing A" +
                              " <where> " +
                              " A.building !=0  and built_area >=#{needVo.min_acreage}  and  built_area <= #{needVo.max_acreage}  and built_area !=0"+
                              " and A.id NOT IN(SELECT housing FROM bgs_follow WHERE need = #{needVo.id} AND bgs_follow.state <5)"+
                              " AND  A.type = #{needVo.max_acreage}"+
                              " <foreach collection=\"params.keys\" item=\"key\"   > "+
               　　　　　　　　  "  　　<choose>\r\n" +
               　　　　　　　  　"        <when test=\"key =='name'\">\r\n" +
              　　　　　　　　　 "           and A.name like concat('%',#{params[${key}]},'%') " +
              　　　　　　　　　 "        </when>\r\n" +
             　　　　　　　　　　 "        <otherwise>\r\n" +
                        　　　 " 　　　　　　<if test=\"params[key]!= null\">and  A.${key} =#{params[${key}]}</if> " +
          　　　　　　　　       "        </otherwise>\r\n" +
              　　　　　　　　　　"    </choose>"+
                              "</foreach>  "+
                              " <if test=\"needVo.min_price!= 0\">and  A.rent_price >=#{needVo.min_price}</if> " +
                              " <if test=\"needVo.max_price!= 0\">and  A.rent_price <=#{needVo.max_price}</if> " +
                              " </where> " +
                              " limit #{page.offset},#{page.size}"+
                               "</script>")
          List<Map<String, Object>> matchHousing(@Param("needVo")Need needVo, @Param("params")Map<String, Object> params,@Param("page") PageUtil page)throws Exception;