mongodb的使用，mongodb语法详解

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}});

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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);

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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})

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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)

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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″);

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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”) );

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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

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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;

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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）

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查询数组：

包含，完全匹配

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

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