package com.whyc.util;
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import com.github.pagehelper.PageInfo;
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import com.whyc.dto.DevAlarmHisDto;
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import com.whyc.mapper.CKPowerDevAlarmHistoryMapper;
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import com.whyc.mapper.CommonMapper;
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import com.whyc.pojo.db_ckpwrdev_alarm.CKPowerDevAlarmHistory;
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import com.whyc.service.SubTablePageInfoService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Component;
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import javax.annotation.Resource;
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import java.text.ParseException;
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import java.util.*;
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import java.util.regex.Pattern;
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/**
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* 数据量极大的表,按照年份分表,分页查询时获取数据
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*/
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@Component
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public class SubTablePageInfoUtils {
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@Resource
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private CommonMapper commonMapper;
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@Autowired
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private SubTablePageInfoService subService;
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/**按年份表分页查询,按时间查询*/
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public PageInfo<Object> getPageInfo(int pageNum,int pageSize,
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Date startTime,Date endTime,
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String dbName,String tablePrefix,
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Object pojo) throws ParseException {
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Map<String, List<Date>> queryTimeForSubTables = DateUtil.getQueryTimeForSubTablesDesc(startTime, endTime);
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//查询分表是否存在,存在则查询结果
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Map<String,Integer> queryCountMap = new LinkedHashMap<>();
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Set<String> tableYearKeySet = queryTimeForSubTables.keySet();
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for (String tableYear : tableYearKeySet) {
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List<Date> queryTime = queryTimeForSubTables.get(tableYear);
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String tableName;
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if(!tableYear.equals("default")){
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//数值
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tableName = tablePrefix+"_"+tableYear;
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String existTableName = commonMapper.existTable(dbName, tableName);
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if(existTableName == null){
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continue;
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}
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}else{
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tableName = tablePrefix;
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}
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//====== 根据不同类型类型对象对应调整 ======
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if(pojo instanceof DevAlarmHisDto) {
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//devalarmHis不存在初始表，跳过
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if(tableYear.equals("default")){
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continue;
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}
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DevAlarmHisDto alm= (DevAlarmHisDto) pojo;
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alm.setAlmStartTime(queryTime.get(0));
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alm.setAlmEndTime(queryTime.get(1));
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alm.setRecordYear(tableName);
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int currentCount = subService.getCountForDevAlm(alm);
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queryCountMap.put(tableYear,currentCount);
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}
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}
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//分页信息
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//确认总页数,总记录数
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PageInfo<Object> pageInfo = new PageInfo<>();
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int total = 0;
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Set<String> queryKeySet = queryCountMap.keySet();
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for (String queryKey : queryKeySet) {
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int size = queryCountMap.get(queryKey);
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total+=size;
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}
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int pages = (int) Math.ceil(Float.parseFloat(String.valueOf(total))/pageSize);
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pageInfo.setTotal(total);
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pageInfo.setPages(pages);
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pageInfo.setPageNum(pageNum);
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pageInfo.setPageSize(pageSize);
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//根据当前页所需记录,查询当前页记录
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int startNum = (pageNum-1)*pageSize+1;
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int endNum = pageNum*pageSize;
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//最后一个算法:上面不应该先查询所有记录,应该取count. 这后面定位到哪个表或哪几张表后,采取limit获取当前页记录数;
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//格式:{表名,[limit 2,20]}
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Map<String,List<Integer>> tableAndLimitMap = MathUtil.getQueryTableAndLimit(startNum,endNum,pageSize,queryCountMap);
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Set<String> keySet = tableAndLimitMap.keySet();
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List<Object> dataList = new LinkedList<>();
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for (String key : keySet) {
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List<Date> queryTime = queryTimeForSubTables.get(key);
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//====== 根据不同类型类型对象对应调整 ======
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String recordYear = key.equals("default") ? tablePrefix : tablePrefix + "_" + key;
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if(pojo instanceof DevAlarmHisDto) {
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DevAlarmHisDto data= (DevAlarmHisDto) pojo;
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data.setAlmStartTime(queryTime.get(0));
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data.setAlmEndTime(queryTime.get(1));
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List<Integer> limitList = tableAndLimitMap.get(key);
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data.setLimitStart(limitList.get(0));
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data.setLimitEnd(limitList.get(1));
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data.setRecordYear(recordYear);
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List<CKPowerDevAlarmHistory> list = subService.getList2(data);
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dataList.addAll(list);
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}
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}
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pageInfo.setList(dataList);
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return pageInfo;
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}
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/**查询是否包含特定规则的表,存在,则返回表名*/
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public List<String> getTableList(String dbName,String tableLike,String regex){
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List<String> resultTableList = new LinkedList<>();
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List<String> tableList = commonMapper.getTableListLike(dbName,tableLike);
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for (String tableName : tableList) {
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boolean matches = Pattern.matches(regex, tableName);
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if(matches){
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resultTableList.add(tableName);
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}
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}
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return resultTableList;
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}
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}
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