Criteria類：

public static Criteria where(String key) 條件查詢欄位

public static Criteria is(Object o)等於

一. 常用查詢:

1. 查詢一條資料:(多用於儲存時判斷db中是否已有當前資料,這裡 is  精確匹配,模糊匹配 使用regex...)

public PageUrl getByUrl(String url) { 
    return findOne(new Query(Criteria.where("url").is(url)),PageUrl.class); 
  } 

2. 查詢多條資料:linkUrl.id 屬於分級查詢

public List<PageUrl> getPageUrlsByUrl(int begin, int end,String linkUrlid) {     
    Query query = new Query(); 
    query.addCriteria(Criteria.where("linkUrl.id").is(linkUrlid)); 
    return find(query.limit(end - begin).skip(begin), PageUrl.class);     
  }

3.模糊查詢:-----關鍵字---regex

public long getProcessLandLogsCount(List<Condition> conditions) 
   { 
     Query query = new Query(); 
     if (conditions != null && conditions.size() > 0) { 
       for (Condition condition : conditions) { 
         query.addCriteria(Criteria.where(condition.getKey()).regex(".*?\\" +condition.getValue().toString()+ ".*")); 
       } 
     } 
     return count(query, ProcessLandLog.class); 
   } 
 

最下面，我在程式碼親自實踐過的模糊查詢，只支援欄位屬性是字串的查詢，你要是查欄位屬性是int的模糊查詢，還真沒轍。

4.gt：大於，gte: 大於等於，it：小於，lte：小於等於，ne：不等於...注意查詢的時候各個欄位的型別要和mongodb中資料型別一致

public List<ProcessLandLog> getProcessLandLogs(int begin,int end,List<Condition> conditions,String orderField,Direction direction) 
   { 
     Query query = new Query(); 
     if (conditions != null && conditions.size() > 0) { 
       for (Condition condition : conditions) { 
         if(condition.getKey().equals("time")){ 
           query.addCriteria(Criteria.where("time").gte(condition.getValue())); //gte: 大於等於 
         }else if(condition.getKey().equals("insertTime")){ 
           query.addCriteria(Criteria.where("insertTime").gte(condition.getValue())); 
         }else{ 
           query.addCriteria(Criteria.where(condition.getKey()).is(condition.getValue())); 
         } 
       } 
     } 
     return find(query.limit(end - begin).skip(begin).with(new Sort(new Sort.Order(direction, orderField))), ProcessLandLog.class); 
   } 
   
 public List<DpsLand> getDpsLandsByTime(int begin, int end, Date beginDate,Date endDate) { 
  return find(new Query(Criteria.where("updateTime").gte(beginDate).lte(endDate)).limit(end - begin).skip(begin), 
   DpsLand.class); 
  }
 

查詢欄位不存在的資料 -----關鍵字---not

public List<GoodsDetail> getGoodsDetails2(int begin, int end) { 
      Query query = new Query(); 
      query.addCriteria(Criteria.where("goodsSummary").not()); 
      return find(query.limit(end - begin).skip(begin),GoodsDetail.class); 
    }

查詢欄位不為空的資料     -----關鍵字---ne

Criteria.where("key1").ne("").ne(null)

查詢或語句：a || b     ----- 關鍵字---orOperator

Criteria criteria = new Criteria(); 
 criteria.orOperator(Criteria.where("key1").is("0"),Criteria.where("key1").is(null));

查詢且語句：a && b     ----- 關鍵字---and

Criteria criteria = new Criteria(); 
criteria.and("key1").is(false); 
criteria.and("key2").is(type); 
Query query = new Query(criteria); 
long totalCount = this.mongoTemplate.count(query, Xxx.class);

查詢一個屬性的子屬性，例如：查下面資料的key2.keyA的語句

var s = { 
    key1: value1, 
    key2: { 
      keyA: valueA, 
      keyB: valueB 
    } 
  }; 
  
@Query("{'key2.keyA':?0}") 
List<Asset> findAllBykeyA(String keyA);

5. 查詢數量:----- 關鍵字---count

public long getPageInfosCount(List<Condition> conditions) { 
     Query query = new Query(); 
     if (conditions != null && conditions.size() > 0) { 
       for (Condition condition : conditions) { 
         query.addCriteria(Criteria.where(condition.getKey()).is(condition.getValue())); 
       } 
     } 
     return count(query, PageInfo.class); 
   }

查詢包含在某個集合範圍：----- 關鍵字---in，nin不包含

Criteria criteria = new Criteria(); 
Object [] o = new Object[]{0, 1, 2}; //包含所有 
criteria.and("type").in(o); 
Query query = new Query(criteria); 
query.with(new Sort(new Sort.Order(Direction.ASC, "type"))).with(new Sort(new Sort.Order(Direction.ASC, "title"))); 
List<WidgetMonitor> list = this.mongoTemplate.find(query, WidgetMonitor.class);

6. 更新一條資料的一個欄位:

public WriteResult updateTime(PageUrl pageUrl) { 
    String id = pageUrl.getId(); 
    return updateFirst(new Query(Criteria.where("id").is(id)),Update.update("updateTime", pageUrl.getUpdateTime()), PageUrl.class); 
  }

7. 更新一條資料的多個欄位:

//呼叫更新 
private void updateProcessLandLog(ProcessLandLog processLandLog, 
      int crawlResult) { 
    List<String> fields = new ArrayList<String>(); 
    List<Object> values = new ArrayList<Object>(); 
    fields.add("state"); 
    fields.add("result"); 
    fields.add("time"); 
    values.add("1"); 
    values.add(crawlResult); 
    values.add(Calendar.getInstance().getTime()); 
    processLandLogReposity.updateProcessLandLog(processLandLog, fields, 
        values); 
  } 
//更新 
public void updateProcessLandLog(ProcessLandLog land, List<String> fields,List<Object> values) { 
    Update update = new Update(); 
    int size = fields.size(); 
    for(int i = 0 ; i < size; i++){ 
      String field = fields.get(i); 
      Object value = values.get(i); 
      update.set(field, value); 
    } 
    updateFirst(new Query(Criteria.where("id").is(land.getId())), update,ProcessLandLog.class); 
  }

8. 刪除資料:

public void deleteObject(Class<T> clazz,String id) { 
    remove(new Query(Criteria.where("id").is(id)),clazz); 
  }

9.儲存資料:

//插入一條資料 
  public void saveObject(Object obj) { 
      insert(obj); 
    } 
    
  //插入多條資料   
  public void saveObjects(List<T> objects) { 
      for(T t:objects){ 
        insert(t); 
      } 
    }

我自己使用的例子：

下面例子涉及到：

精確查詢：is；

模糊查詢：regex；

分頁查詢，每頁多少：skip，limit

按某個欄位排序(或升或降)：new Sort(new Sort.Order(Sort.Direction.ASC, "port"))

查詢數量：count

public Map<String, Object> getAppPortDetailByPage(int pageNo, int pageSize, String order, String sortBy, String appPortType, String appPortSeacherName) { 
  Criteria criteria = new Criteria(); 
  if (!appPortType.equals("")) { 
    if (!appPortType.equals("all")) { 
      //DB表裡的欄位----appmanageType 
      //下同 port protocol 也是DB表的欄位 
      criteria.and("appmanageType").is(appPortType); 
    } 
  } 
  if (!appPortSeacherName.equals("")) { 
    try { 
      criteria.orOperator(Criteria.where("port").is(Integer.parseInt(appPortSeacherName)), 
          Criteria.where("protocol").regex(".*?" + appPortSeacherName + ".*")); 
    }catch (Exception e){ 
      criteria.orOperator(Criteria.where("protocol").regex(".*?" + appPortSeacherName + ".*")); 
    } 
  } 
  Map<String, Object> result = Maps.newHashMap(); 
  Query query = new Query(criteria); 
  query.skip((pageNo - 1) * pageSize); 
  query.limit(pageSize); 
  if(order != null && sortBy != null){ 
    query.with(new Sort(new Sort.Order(order.equals("asc") ? Sort.Direction.ASC : Sort.Direction.DESC, sortBy))); 
  }else { 
    query.with(new Sort(new Sort.Order(Sort.Direction.ASC, "port"))); 
  } 
  List<Appportmanage> list = this.mongoTemplate.find(query, Appportmanage.class); 
  long count = this.mongoTemplate.count(query, Appportmanage.class); 
  result.put("datas", list); 
  result.put("size", count); 
  return result; 
}

分頁查詢和排序