java 中mongodb的各种操作查询的实例详解

时间:2021-07-26 07:25:06

javamongodb的各种操作查询的实例详解

一. 常用查询:

1. 查询一条数据:(多用于保存时判断db中是否已有当前数据,这里 is  精确匹配,模糊匹配 使用regex...)

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

2. 查询多条数据:linkUrl.id 属于分级查询

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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.模糊查询:-----关键字---regex

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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,我在代码亲自实践过的模糊查询,只支持字段属性是字符串的查询,你要是查字段属性是int的模糊查询,还真没辙。

4.gte: 大于等于,lte小于等于...注意查询的时候各个字段的类型要和mongodb中数据类型一致

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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: 大于等于
         }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);
  }

查询字段不存在的数据 -----关键字---not

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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);
    }

查询字段不为空的数据     -----关键字---ne

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

查询或语句:a || b     ----- 关键字---orOperator

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

查询且语句:a && b     ----- 关键字---and

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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);

查询一个属性的子属性,例如:查下面数据的key2.keyA的语句

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

5. 查询数量:----- 关键字---count

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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);
   }

查找包含在某个集合范围:----- 关键字---in

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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. 更新一条数据的一个字段:

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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. 更新一条数据的多个字段:

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//调用更新
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. 删除数据:

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

9.保存数据:

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//插入一条数据
  public void saveObject(Object obj) {
      insert(obj);
    }
   
  //插入多条数据  
  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:

精确查询:is;

模糊查询:regex;

分页查询,每页多少:skip,limit

按某个字段排序(或升或降):new Sort(new Sort.Order(Sort.Direction.ASC, "port"))

查询数量:count

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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表里的字段----appmanageType
      //下同 port protocol 也是DB表的字段
      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;
}

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原文链接:http://blog.csdn.net/qq_33732975/article/details/69942563