mongodb常用语句以及SpringBoot中使用mongodb

普通查询

某个字段匹配数组内的元素数量的，假如region只有一个元素的
db.getCollection('map').find({region:{$size:1}})
假如region只有0个元素的
db.getCollection('map').find({region:{$size:0}})
db.getCollection('map').find({region:{$size:1}}).count()
db.getCollection('map').find({"area":{$gt:[]}}).count()
db.getCollection('map').find({"area":{$eq:[]}}).count()字段为[]
db.getCollection('map').find({"address_city":{$eq:[]}})
字段不存在
db.getCollection('map').find({"local":{$exists:false}});这个不能按>和<查询

db.getCollection('map').find({"type":"3"})
db.map.find({"type":"3"})

找出非空

db.getCollection('表').find({"字段":{$exists:true}});

查_id需要注意

db.map_area.find({"_id":ObjectId("5811c104dd908725398b5XXX")})

mongodb原生正则查询

任意匹配
db.getCollection('表').find({"description":/玉兰小区/});
前缀
db.getCollection('表').find({"description":/^玉兰/});
加i兼容大小写
db.getCollection('表').find({"station_area":/EC/i});

spring MongoDB

	//等效criteria.andOperator(criteria.where("name").regex(".*" + v + ".*"));criteria.andOperator(criteria.where("name").regex(".*\\" + v + "\\.*"));criteria.andOperator(criteria.where("name").regex(".*?" + v + ".*"));//前缀查询criteria.andOperator(criteria.where("name").regex(".*^" + v + ".*"));

条件查询

//完全匹配
Pattern pattern = Pattern.compile("^商品$", Pattern.CASE_INSENSITIVE);
//右匹配
Pattern pattern = Pattern.compile("^.*商品$", Pattern.CASE_INSENSITIVE);
//左匹配
Pattern pattern = Pattern.compile("^商品.*$", Pattern.CASE_INSENSITIVE);
//模糊匹配
Pattern pattern = Pattern.compile("^.*商品.*$", Pattern.CASE_INSENSITIVE);
Query query = Query.query(Criteria.where(fieldName).regex(pattern));  
List<UserInfo> users = mongoTemplate.find(query, UserInfo.class, classname);

返回指定字段

只返回address，不要id。注意前面的{}不可少

db.getCollection('user').find({},{address:1,_id:0})

数字查询mongodb原生语句

db.getCollection('表').find({"number": {$regex: '76', $options:'i'}});

Java代码同时多条件or查询

Pattern pattern = Pattern.compile(search, Pattern.CASE_INSENSITIVE);criteria.orOperator(criteria.where("name").regex(".*?\\" + search + ".*"),criteria.where("number").regex(pattern));

查询大于某个字段长度的列表

db.getCollection('表').find({"字段": {"$exists": true, "$regex": /^.{5,}$/}}).limit(5)

更新数据

db.t1.updateOne({"_id":ObjectId("523eb382d7f8b9ac3b18b4571")},
{"$set":{"name":"XXX1"}})

Query query = Query.query(Criteria.where("_id").is("53eb382d7f8b9ac3b18b4574"));
Update update = Update.update("_id", "53eb382d7f8b9ac3b18b4574").set("name","xxx22").set("description","xxxx22");

in查询

原生语句

in查询
db.getCollection('表').find({$or:[{number:"01"},{number:"02"}]})
db.getCollection('表').find({$or:[{number:"01"},{number:"02"},{status:1}]})

spring中MongoTemplate

Query query = new Query();
Criteria criteria = new Criteria();
if (condition.getType().equals("in")) {List<String> v = Arrays.asList(condition.split(","));criteria.andOperator(criteria.where("name").in(v));
}
query.addCriteria(criteria);

多条件查询or

Criteria c1= Criteria.where("name").is("XXX");
Criteria c2= Criteria.where("number").is("01");Criteria cr = new Criteria();
Query query = new Query();
query.addCriteria(cr.orOperator(c1,c2));

and

query.addCriteria(cr.andOperator(c1,c2));

多条件查询也可以这样写：

Criteria criteria = new Criteria().andOperator(  Criteria.where("id").is(28),  Criteria.where("name").is("123")  
);  

动态拼凑Criteria

Query query = new Query();
Criteria cr = new Criteria();List<Criteria> criteriaList=new ArrayList<>();
//这里可以写for循环
Criteria c1= Criteria.where("name").is("XXX");
criteriaList.add(c1);
Criteria c2= Criteria.where("number").is("01");
criteriaList.add(c2);if(criteriaList.size()>0) {Criteria[] criteriaArray = criteriaList.toArray(new Criteria[criteriaList.size()]);cr.andOperator(criteriaArray);
}
query.addCriteria(cr);if (select != null && select.size() > 0) {for (String tmp : select) {query.fields().include(tmp);}
}
List<User> list = mongoOperations.find(query, clazz);

这个写的还可以，比较全，可以延伸参考下：https://blog.csdn.net/weixin_43935907/article/details/86568387

分页

先看这个：https://www.cnblogs.com/woshimrf/p/mongodb-pagenation-performance.html

//当前第0页，每页2条

query.skip(page*row);
query.limit(row);

分页要注意 skip要*row

public int getPageSize() {return pageSize;}public void setPageSize(int pageSize) {this.pageSize = pageSize;}public int getSkip() {skip=(pageNo-1)*pageSize;return skip;}public void setSkip(int skip) {this.skip = skip;}

参考https://blog.csdn.net/congcong68/article/details/47624221

分页参考：https://blog.csdn.net/u013042707/article/details/82668613?utm_source=blogxgwz1

Criteria c1=null;Criteria c2=null;Criteria c3=null;ArrayList<Criteria> list=new ArrayList<Criteria>();if (vo.getCatalog1()!=null){c1 = Criteria.where(MyBean.FILD_CATALOG1).is(vo.getCatalog1());list.add(c1);}if (vo.getCatalog()!=null){c2=Criteria.where(MyBean.FILD_CATALOG).is(vo.getCatalog());list.add(c2);}if (vo.getTitle()!=null){//模糊查询c3=Criteria.where(MyBean.FILD_TITLE).regex(".*?\\" +vo.getTitle()+ ".*");list.add(c3);}Criteria[] arr=new Criteria[list.size()];list.toArray(arr);Criteria criteria=new Criteria().andOperator(arr);Query query=new Query(criteria);query.skip((vo.getPage()-1)*vo.getPageSize());query.limit(vo.getPageSize());List<MyBean>  list= mongoTemplate.find(query, MyBean.class);return list;

分页排序

//分页和排序if (simplePageRequest.getPage() != null && simplePageRequest.getRows() != null) {query.skip(simplePageRequest.getPage() - 1);query.limit(simplePageRequest.getRows());
}if (simplePageRequest.getSort() != null && simplePageRequest.getOrder() != null) {Sort.Direction SortDirection;if (simplePageRequest.getSort().toLowerCase().equals("asc")) {SortDirection = Sort.Direction.ASC;} else {SortDirection = Sort.Direction.DESC;}Sort sort = new Sort(SortDirection, simplePageRequest.getOrder());query.with(sort);
}

说明：多个排序参数

Sort sort = new Sort(Sort.Direction.ASC, “ID”).and(new Sort(Sort.Direction.ASC, “TIME”));

查看索引：

db.getCollection('表').getIndexes()

查询数组个数限制

https://docs.mongodb.com/manual/reference/operator/query/size/

img是个数组，需要数组个数>2个

写法1：这是一种比较骚的写法，一般看不明白：

MongoDB下根据数组大小查询

criteria.and("img.2").exists(true);

写法2:取反

criteria.norOperator( Criteria.where("img").size(0));

写法3:枚举  有局限多了不好搞  这实际上是查单个等于的

criteria.orOperator(Criteria.where("img").size(3),Criteria.where("img").size(4),Criteria.where("img").size(5),Criteria.where("img").size(6));

不为空不为null

criteria.and("img").ne("").ne(null);

扩展参考：

mongodb查询非空数组的几种方法

Spring Data Mongodb的Criteria类（all、and、andOperator、elemMatch）

查询数组：

包含，完全匹配

https://blog.csdn.net/leshami/article/details/55049891