动态获取当前时间，查询数据。

HashMap<String,Object> paramMap =new HashMap<String,Object>();
            //获取当前时间
            SimpleDateFormat timesystem = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Date date = new Date();
            
            String createDate = timesystem.format(date);
            paramMap.put("createDate", createDate);
            
            //获取当前月，确定表名
            SimpleDateFormat getmonth = new SimpleDateFormat("M");
            String month = getmonth.format(date);
            paramMap.put("month", month);
            
            //将当前时间减上一天，做条件查询
            Calendar calendar =Calendar.getInstance();
            calendar.setTime(date);
            calendar.set(Calendar.DATE, calendar.get(Calendar.DATE)-1);
            date= calendar.getTime();
            String beforetime = timesystem.format(date);
            paramMap.put("beforetime", beforetime);
            return this.thirdAPIService.listdhHistoryRoom(paramMap);
        }

数据库SQL语句

 <select id="selectDhRoomHistory" parameterType="java.util.HashMap" resultType="java.util.LinkedHashMap">
        <![CDATA[
            select * from dh_room_history_${month} 
        ]]>
        <where>
        <if test ="beforetime != null">
            <![CDATA[ and createDate >= #{beforetime} ]]>
        </if>
        <if test ="createDate != null">
             <![CDATA[ and createDate <= #{createDate} ]]>
        </if>
        </where>
     </select>