省市县从数据库读出来的list数据转换成json格式的数据
一,数据源
1.1,数据库查出来的数据是
两张表先各自左外连接,然后在相互左外连接查找省市县的数据(业务需求必须这样做,省市去的是第一张表,而市县取的是第二张表,两张表中间通过市的名字连接)见这个博文的最后一张图片
1.2,要求转换成的json格式的数据
1.2.1,完整数据
json省市县数据源(这是全部的数据)
1.2.2,抽取的数据
[ { "Code": "410000", "Name": "河南省", "level": [ { "Code": "414500", "Name": "郑州市", "level": [ { "Code": "414500", "Name": "二七区", "sort": 1 }, { "Code": "414500", "Name": "中原区", "sort": 2 } ], "sort": 1 }, { "Code": "414530", "Name": "新乡市", "level": [ { "Code": "414530", "Name": "卫滨区", "sort": 1 }, { "Code": "414530", "Name": "牧野区", "sort": 2 } ], "sort": 2 } ] }, { "Code": "410000", "Name": "陕西省", "level": [ { "Code": "414500", "Name": "汉中市", "level": [ { "Code": "414500", "Name": "西乡县", "sort": 1 }, { "Code": "414500", "Name": "南郑县", "sort": 2 } ], "sort": 1 }, { "Code": "414530", "Name": "宝鸡市", "level": [ { "Code": "414530", "Name": "岐山县", "sort": 1 }, { "Code": "414530", "Name": "芙蓉县", "sort": 2 } ], "sort": 2 } ] } ]
二,转化的整体代码
2.1,代码总览
/** * 查询省份城市区县 * * @return */ public String queryFullZoneInfo() { List<Map<String, String>> mapList = zoneInfoService.queryFullZoneInfo(); List<Map<String, Object>> zoneList = new ArrayList<Map<String, Object>>(); Map<String, Object> existMap = new HashMap<String, Object>(); for (Map<String, String> map : mapList) { String province = map.get("province"); Map<String, Object> provinceMap = null; if (existMap.containsKey(province)) { provinceMap = (Map<String, Object>) existMap.get(province); } else { provinceMap = new HashMap<String, Object>(); existMap.put(province, provinceMap); zoneList.add(provinceMap); } provinceMap.put("Code", map.get("provinceCode")); provinceMap.put("Name", map.get("province")); String city = map.get("city"); if (StringUtils.isNotEmpty(city)) { List<Map<String, Object>> provinceCityList = null; if (existMap.containsKey(province + "_")) { provinceCityList = (List<Map<String, Object>>) existMap.get(province + "_"); } else { provinceCityList = new ArrayList<Map<String, Object>>(); existMap.put(province + "_", provinceCityList); provinceMap.put("level", provinceCityList); } Map<String, Object> provinceCityMap = null; if (existMap.containsKey(province + "_" + city)) { provinceCityMap = (Map<String, Object>) existMap.get(province + "_" + city); } else { provinceCityMap = new HashMap<String, Object>(); existMap.put(province + "_" + city, provinceCityMap); provinceCityList.add(provinceCityMap); String citySort = String.valueOf(existMap.get(province + "_sort")); existMap.put(province + "_sort", "null".equals(citySort) ? 1 : NumberUtils.toInt(citySort) + 1); provinceCityMap.put("sort", existMap.get(province + "_sort")); } provinceCityMap.put("Name", city); provinceCityMap.put("Code", map.get("cityCode")); List<Map<String, Object>> provinceCityCountryList = null; if (existMap.containsKey(province + "_" + city + "_")) { provinceCityCountryList = (List<Map<String, Object>>) existMap.get(province + "_" + city + "_"); } else { provinceCityCountryList = new ArrayList<Map<String, Object>>(); existMap.put(province + "_" + city + "_", provinceCityCountryList); provinceCityMap.put("level", provinceCityCountryList); } String country = map.get("country"); Map<String, Object> provinceCityCountryMap = null; if (StringUtils.isNotEmpty(country)) { if (existMap.containsKey(province + "_" + city + "_" + country)) { provinceCityCountryMap = (Map<String, Object>) existMap.get(province + "_" + city + "_" + country); } else { provinceCityCountryMap = new HashMap<String, Object>(); existMap.put(province + "_" + city + "_" + country, provinceCityCountryMap); provinceCityCountryList.add(provinceCityCountryMap); String countrySort = String.valueOf(existMap.get(province + "_" + city + "_sort")); existMap.put(province + "_" + city + "_sort", "null".equals(countrySort) ? 1 : NumberUtils.toInt(countrySort) + 1); provinceCityCountryMap.put("sort", existMap.get(province + "_" + city + "_sort")); } provinceCityCountryMap.put("Code", map.get("countryCode")); provinceCityCountryMap.put("Name", country); } else { provinceCityCountryMap = new HashMap<String, Object>(); provinceCityCountryList.add(provinceCityCountryMap); provinceCityCountryMap.put("sort", 1); provinceCityCountryMap.put("Code", ""); provinceCityCountryMap.put("Name", ""); } } } try { return JsonUtils.toJson(zoneList); } catch (Exception e) { e.printStackTrace(); } return null; }
三,代码解析
3.1,json格式数据分析
从1.2.2的数据我们可以看到这个json所要求的数据是这个样子的
3.1.1,list
第一个大的list里面装的是34个省的对象组成的一个list集合。
3.1.2,map(对象)
每一个省中有code,和name的键值对,还有一个level的list集合
3.1.3,list
就是上面所说的level的集合,这个集合当中装的是每一个省里面的地级市的map对象
3.1.4,map(对象)
map对象里面有code,name的键值对,还有一个level的list集合,此外还有一个代表顺序的sort标示符
3.1.5,list
就是上面所说的level的集合,这个集合当中装的是每一个地级市里面装的县城的map对象
3.1.6,map(对象)
map对象里面有code,name的键值对,此外还有一个代表顺序的sort标示符,注意这个里面是没有list的集合了,因为它已经是最后一层了。
3.2,java代码分析
3.2.1,代码初步实现
根据上面的代码我们可以写出这样的代码
public String queryFullZoneInfo() { List<Map<String, String>> mapList = zoneInfoService.queryFullZoneInfo(); List<Map<String, Object>> zoneList = new ArrayList<Map<String, Object>>(); Map<String, Object> existMap = new HashMap<String, Object>(); Map<String, Object> provinceMap = new HashMap<String, Object>(); Map<String, Object> provinceCityMap = new HashMap<String, Object>(); List<Map<String, Object>> provinceCityList = new ArrayList<Map<String, Object>>(); List<Map<String, Object>> provinceCityCountryList = new ArrayList<Map<String, Object>>(); Map<String, Object> provinceCityCountryMap = new HashMap<String, Object>(); for (Map<String, String> map : mapList) { zoneList = new ArrayList<Map<String, Object>>(); provinceMap = new HashMap<String, Object>(); provinceCityMap = new HashMap<String, Object>(); provinceMap.put("Code", map.get("provinceCode")); provinceCityList = new ArrayList<Map<String, Object>>(); provinceCityCountryList = new ArrayList<Map<String, Object>>(); provinceCityCountryMap = new HashMap<String, Object>(); provinceMap.put("Name", map.get("province"));
provinceMap.put("level", provinceCityList);
provinceCityList.add(provinceCityMap);
provinceCityMap.put("Name", map.get("city")); provinceCityMap.put("Code", map.get("cityCode"));
provinceCityMap.put("level", provinceCityCountryList);
provinceCityCountryList.add(provinceCityCountryMap);
provinceCityCountryMap.put("Code", map.get("countryCode")); provinceCityCountryMap.put("Name", map.get("country")); zoneList.add(provinceMap); } try { return JsonUtils.toJson(zoneList); } catch (Exception e) { e.printStackTrace(); }
注意上面空开的空格是和4.2做对比用的。
3.2.2,注意点
在上面的代码中虽然provinceMap是先把provinceCityList给put进去的,但是这不影响后面provinceCityList的取值,换句话就是当执行到这句
provinceMap.put("level", provinceCityList);
代码的时候,provinceCityList是null,只到这句代码
provinceCityList.add(provinceCityMap);
provinceCityMap.put("Name", map.get("city"));
provinceCityMap.put("Code", map.get("cityCode"));
执行完之后它才有的值,但同时注意了,provinceMap里面的provinceCityList也就有了值,这是后面给它赋值的。
3.2.3,注意点升级
String province = map.get("province"); Map<String, Object> provinceMap = null; if (existMap.containsKey(province)) { provinceMap = (Map<String, Object>) existMap.get(province); } else { provinceMap = new HashMap<String, Object>(); existMap.put(province, provinceMap);{黑龙江省={Name=黑龙江省, Code=230000}} zoneList.add(provinceMap); } provinceMap.put("Code", map.get("provinceCode")); provinceMap.put("Name", map.get("province")); 注意理解上面的代码: 是先申明了一个map,注意第一遍走的时候existMap.put(province, provinceMap);它是空的 但是当走到provinceMap.put("Code", map.get("provinceCode")); provinceMap.put("Name", map.get("province"));这两行的时候它会把值给塞进去, 这时候existMap里面有值了 即使如果不走else里面的语句,也会把值给塞进去的。
3.2.4,问题点
假如像上面那样去解决问题的话,那么后面的代码永远会把前面的代码给覆盖掉的,
因为每一次都是new的一个对象。所以到最后上万条的数据,只会出来最后一条数据,
比如我测试的结果
[ { "Code": "310000", "Name": "上海市", "level": [ { "Code": "310100", "Name": "上海市", "level": [ { "Code": "2909", "Name": "长宁区" } ] } ] } ]
最后返回的就是这一条数据,完全不是自己要的东西。
四,解决方法
4.1,代码
和2.1的代码是一么一样的。
4.2,注意点
这句代码就是在原来的基础上加了一个existMap的双例集合
我们把2.1的代码分开来读就会更加清晰
if (existMap.containsKey(province + "_")) { provinceCityList = (List<Map<String, Object>>) existMap.get(province + "_"); } else { provinceCityList = new ArrayList<Map<String, Object>>(); existMap.put(province + "_", provinceCityList); provinceMap.put("level", provinceCityList); }
if (existMap.containsKey(province + "_" + city)) { provinceCityMap = (Map<String, Object>) existMap.get(province + "_" + city); } else { provinceCityMap = new HashMap<String, Object>(); existMap.put(province + "_" + city, provinceCityMap); provinceCityList.add(provinceCityMap); String citySort = String.valueOf(existMap.get(province + "_sort")); existMap.put(province + "_sort", "null".equals(citySort) ? 1 : NumberUtils.toInt(citySort) + 1); provinceCityMap.put("sort", existMap.get(province + "_sort")); }
if (existMap.containsKey(province + "_" + city + "_")) { provinceCityCountryList = (List<Map<String, Object>>) existMap.get(province + "_" + city + "_"); } else { provinceCityCountryList = new ArrayList<Map<String, Object>>(); existMap.put(province + "_" + city + "_", provinceCityCountryList); provinceCityMap.put("level", provinceCityCountryList); }
if (existMap.containsKey(province + "_" + city + "_" + country)) { provinceCityCountryMap = (Map<String, Object>) existMap.get(province + "_" + city + "_" + country); } else { provinceCityCountryMap = new HashMap<String, Object>(); existMap.put(province + "_" + city + "_" + country, provinceCityCountryMap); provinceCityCountryList.add(provinceCityCountryMap); String countrySort = String.valueOf(existMap.get(province + "_" + city + "_sort")); existMap.put(province + "_" + city + "_sort", "null".equals(countrySort) ? 1 : NumberUtils.toInt(countrySort) + 1); provinceCityCountryMap.put("sort", existMap.get(province + "_" + city + "_sort")); }
4.3,解析existMap作用
因为假如现在没有这个map集合就会产生覆盖的作用,现在这个map的作用就是把取出来的值以不同的名字取出来放到map集合中来,假如下一次再去取的时候如果有就不在新建对象了,直接用原来的就行了,如果没有在建立新的对象。
这就解决了覆盖的问题。
同时也给sort排上了序号。
用下面的例子来说明
有就取原来的,没有就新建,这样的话就会把后面新的数据加到前面有的数据里面
举个例子,假如现在是河南省map1里面有name,code,和sort,leval集合,第一遍是地级市是安阳,当第二遍循环的时候,还是取省份这时候还是河南省,就不会新建一个map了,而是还是取原来的map1,这时候假如是新乡市,就会把新乡市,同样加在这个map当中,这样一个map当中就会有两个leval了
假如现在不是河南省了,而是陕西省了,就会新建一个map2,会把它里面的数据加载这个map2当中,
map1,map2装在一个list中返回,就有效的避免了第一种情况的产生了。
其中市县和上面也是同样的道理。
注意这个existMap里面装的数据会特别的多,比返回的provinceMap大了几万倍呢。
我们以上面的json的数据来手动遍历几遍。
4.3.1,首次遍历
{ "Code": "410000", "Name": "河南省", "level": [ { "Code": "414500", "Name": "郑州市", "level": [ { "Code": "414500", "Name": "二七区", "sort": 1 } ], "sort": 1 } ] }
4.3.2,2遍
{ "Code": "410000", "Name": "河南省", "level": [ { "Code": "414500", "Name": "郑州市", "level": [ { "Code": "414500", "Name": "二七区", "sort": 1 }, { "Code": "414500", "Name": "中原区", "sort": 2 } ], "sort": 1 } ] }
4.3.3,3遍
{ "Code": "410000", "Name": "河南省", "level": [ { "Code": "414500", "Name": "郑州市", "level": [ { "Code": "414500", "Name": "二七区", "sort": 1 }, { "Code": "414500", "Name": "中原区", "sort": 2 } ], "sort": 1 }, { "Code": "414530", "Name": "新乡市", "level": [ { "Code": "414530", "Name": "卫滨区", "sort": 1 } ], "sort": 2 } ] }
4.3.4,4遍
{ "Code": "410000", "Name": "河南省", "level": [ { "Code": "414500", "Name": "郑州市", "level": [ { "Code": "414500", "Name": "二七区", "sort": 1 }, { "Code": "414500", "Name": "中原区", "sort": 2 } ], "sort": 1 }, { "Code": "414530", "Name": "新乡市", "level": [ { "Code": "414530", "Name": "卫滨区", "sort": 1 }, { "Code": "414530", "Name": "牧野区", "sort": 2 } ], "sort": 2 } ] }
4.3.5,5遍
[ { "Code": "410000", "Name": "河南省", "level": [ { "Code": "414500", "Name": "郑州市", "level": [ { "Code": "414500", "Name": "二七区", "sort": 1 }, { "Code": "414500", "Name": "中原区", "sort": 2 } ], "sort": 1 }, { "Code": "414530", "Name": "新乡市", "level": [ { "Code": "414530", "Name": "卫滨区", "sort": 1 }, { "Code": "414530", "Name": "牧野区", "sort": 2 } ], "sort": 2 } ] }, { "Code": "410000", "Name": "陕西省", "level": [ { "Code": "414500", "Name": "汉中市", "level": [ { "Code": "414500", "Name": "西乡县", "sort": 1 } ], "sort": 1 } ] } ]
4.3.6,6遍
[ { "Code": "410000", "Name": "河南省", "level": [ { "Code": "414500", "Name": "郑州市", "level": [ { "Code": "414500", "Name": "二七区", "sort": 1 }, { "Code": "414500", "Name": "中原区", "sort": 2 } ], "sort": 1 }, { "Code": "414530", "Name": "新乡市", "level": [ { "Code": "414530", "Name": "卫滨区", "sort": 1 }, { "Code": "414530", "Name": "牧野区", "sort": 2 } ], "sort": 2 } ] }, { "Code": "410000", "Name": "陕西省", "level": [ { "Code": "414500", "Name": "汉中市", "level": [ { "Code": "414500", "Name": "西乡县", "sort": 1 }, { "Code": "414500", "Name": "南郑县", "sort": 2 } ], "sort": 1 } ] } ]
4.3.7,7遍
[ { "Code": "410000", "Name": "河南省", "level": [ { "Code": "414500", "Name": "郑州市", "level": [ { "Code": "414500", "Name": "二七区", "sort": 1 }, { "Code": "414500", "Name": "中原区", "sort": 2 } ], "sort": 1 }, { "Code": "414530", "Name": "新乡市", "level": [ { "Code": "414530", "Name": "卫滨区", "sort": 1 }, { "Code": "414530", "Name": "牧野区", "sort": 2 } ], "sort": 2 } ] }, { "Code": "410000", "Name": "陕西省", "level": [ { "Code": "414500", "Name": "汉中市", "level": [ { "Code": "414500", "Name": "西乡县", "sort": 1 }, { "Code": "414500", "Name": "南郑县", "sort": 2 } ], "sort": 1 }, { "Code": "414530", "Name": "宝鸡市", "level": [ { "Code": "414530", "Name": "岐山县", "sort": 1 } ], "sort": 2 } ] } ]
4.3.8,8遍
[ { "Code": "410000", "Name": "河南省", "level": [ { "Code": "414500", "Name": "郑州市", "level": [ { "Code": "414500", "Name": "二七区", "sort": 1 }, { "Code": "414500", "Name": "中原区", "sort": 2 } ], "sort": 1 }, { "Code": "414530", "Name": "新乡市", "level": [ { "Code": "414530", "Name": "卫滨区", "sort": 1 }, { "Code": "414530", "Name": "牧野区", "sort": 2 } ], "sort": 2 } ] }, { "Code": "410000", "Name": "陕西省", "level": [ { "Code": "414500", "Name": "汉中市", "level": [ { "Code": "414500", "Name": "西乡县", "sort": 1 }, { "Code": "414500", "Name": "南郑县", "sort": 2 } ], "sort": 1 }, { "Code": "414530", "Name": "宝鸡市", "level": [ { "Code": "414530", "Name": "岐山县", "sort": 1 }, { "Code": "414530", "Name": "芙蓉县", "sort": 2 } ], "sort": 2 } ] } ]
致此一个流程走完就大概知道它的一个流程了。
五,优化
5.1,优化一
因为existMap数据是特别大的,所以每当我们遍历完一个省份之后就把里面的数据清除
String province = map.get("province"); Map<String, Object> provinceMap = null; if(province!=existMap.get("province")){ existMap.clear(); }
拿这一次的取出来的province和existMap里面的province对比,假如有就继续遍历,假如没有就说明换省份了,清空exitMap,这样会提升效率。
5.2,优化二
最后一次就不用王existMap里面放值了,因为我们知道没遍历一次省市可能一样,但是县绝对是不一样的。
String country = map.get("country"); Map<String, Object> provinceCityCountryMap = null; if (StringUtils.isNotEmpty(country)) { provinceCityCountryMap = new HashMap<String, Object>(); provinceCityCountryList.add(provinceCityCountryMap); String countrySort = String.valueOf(existMap.get(province + "_" + city + "_sort")); existMap.put(province + "_" + city + "_sort", "null".equals(countrySort) ? 1 : NumberUtils.toInt(countrySort) + 1); provinceCityCountryMap.put("sort", existMap.get(province + "_" + city + "_sort")); provinceCityCountryMap.put("Code", map.get("countryCode")); provinceCityCountryMap.put("Name", country);
5.3,优化完之后完整的代码
public String queryFullZoneInfo() { List<Map<String, String>> mapList = zoneInfoService.queryFullZoneInfo(); List<Map<String, Object>> zoneList = new ArrayList<Map<String, Object>>(); Map<String, Object> existMap = new HashMap<String, Object>(); for (Map<String, String> map : mapList) { String province = map.get("province"); Map<String, Object> provinceMap = null; if(province!=existMap.get("province")){ existMap.clear(); } if (existMap.containsKey(province)) { provinceMap = (Map<String, Object>) existMap.get(province); } else { provinceMap = new HashMap<String, Object>(); existMap.put(province, provinceMap); zoneList.add(provinceMap); } provinceMap.put("Code", map.get("provinceCode")); provinceMap.put("Name", map.get("province")); String city = map.get("city"); if (StringUtils.isNotEmpty(city)) { List<Map<String, Object>> provinceCityList = null; if (existMap.containsKey(province + "_")) { provinceCityList = (List<Map<String, Object>>) existMap.get(province + "_"); } else { provinceCityList = new ArrayList<Map<String, Object>>(); existMap.put(province + "_", provinceCityList); provinceMap.put("level", provinceCityList); } Map<String, Object> provinceCityMap = null; if (existMap.containsKey(province + "_" + city)) { provinceCityMap = (Map<String, Object>) existMap.get(province + "_" + city); } else { provinceCityMap = new HashMap<String, Object>(); existMap.put(province + "_" + city, provinceCityMap); provinceCityList.add(provinceCityMap); String citySort = String.valueOf(existMap.get(province + "_sort")); existMap.put(province + "_sort", "null".equals(citySort) ? 1 : NumberUtils.toInt(citySort) + 1); provinceCityMap.put("sort", existMap.get(province + "_sort")); } provinceCityMap.put("Name", city); provinceCityMap.put("Code", map.get("cityCode")); List<Map<String, Object>> provinceCityCountryList = null; if (existMap.containsKey(province + "_" + city + "_")) { provinceCityCountryList = (List<Map<String, Object>>) existMap.get(province + "_" + city + "_"); } else { provinceCityCountryList = new ArrayList<Map<String, Object>>(); existMap.put(province + "_" + city + "_", provinceCityCountryList); provinceCityMap.put("level", provinceCityCountryList); } String country = map.get("country"); Map<String, Object> provinceCityCountryMap = null; if (StringUtils.isNotEmpty(country)) { provinceCityCountryMap = new HashMap<String, Object>(); provinceCityCountryList.add(provinceCityCountryMap); String countrySort = String.valueOf(existMap.get(province + "_" + city + "_sort")); existMap.put(province + "_" + city + "_sort", "null".equals(countrySort) ? 1 : NumberUtils.toInt(countrySort) + 1); provinceCityCountryMap.put("sort", existMap.get(province + "_" + city + "_sort")); provinceCityCountryMap.put("Code", map.get("countryCode")); provinceCityCountryMap.put("Name", country); } else { provinceCityCountryMap = new HashMap<String, Object>(); provinceCityCountryList.add(provinceCityCountryMap); provinceCityCountryMap.put("sort", 1); provinceCityCountryMap.put("Code", ""); provinceCityCountryMap.put("Name", ""); } } } try { return JsonUtils.toJson(zoneList); } catch (Exception e) { e.printStackTrace(); } return null; }
5.4
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