修改调度车辆，优先级优先于空闲时间

@@ -53,7 +53,7 @@
                 and vehicle_type = #{vehicleType,jdbcType=VARCHAR}
             </if>
         </where>
-        order by freetime,priority
+        order by priority,freetime
     </select>
 
     <delete id="deleteByPrimaryKey" parameterType="java.lang.String">