MongoClient mongoclient=new MongoClient("127.0.0.1",27017);

mongoclient.close();

//獲取鏈接對象，參數(shù)1為url，參數(shù)2為端口號
MongoClient mongoclient=new MongoClient("127.0.0.1",27017);
//獲取所有庫名的迭代器
MongoIterable<String> list= mongoclient.listDatebaseNames();
for(String str:list){
    System.out.println(str);//查看所有庫名
}

//獲取鏈接對象，參數(shù)1為url，參數(shù)2為端口號
MongoClient mongoclient=new MongoClient("127.0.0.1",27017);
//獲取庫對象，參數(shù)為庫名
MongoDatabase db=mongoclient.getDatabase("school");
//獲取當(dāng)前庫對象的所有集合名的迭代器
MongoIterable<String> list=db.getlistCollectionNames();
for(String str:list){
    System.out.println(str);//獲取所有集合名
}
//獲取集合對象，參數(shù)為集合名
MongoCollention<Document> collection=db.getCollection("student");

//獲取集合對象
MongoCollection<Document> collection = db.getCollection("student");
//新增時創(chuàng)建一個Docuement對象，以鍵值對的形式傳入內(nèi)容
Document document = new Document();
document.put("name", "張三");
document.put("age", 99);
document.put("sex", "男");
//添加一條數(shù)據(jù)，沒有返回值
collection.insertOne(document);
//新增多條數(shù)據(jù),傳入一個document集合
collection.insertMany(null);

 
//修改條件
Bson eq = Filters.eq("name","張三");
//修改匹配到的第一條
UpdateResult updateOne = collection.updateOne(
	eq, new Document("$set",new Document("age",50)));
//修改匹配的多條
collection.updateMany(eq, null);

AcknowledgedUpdateResult{matchedCount=0, modifiedCount=0, upsertedId=null}

//條件
Bson eq = Filters.eq("name","張三");
//刪除一條符合的
DeleteResult deleteOne = collection.deleteOne(eq);
//刪除 所有符合條件的
DeleteResult deleteMany = collection.deleteMany(eq);

AcknowledgedDeleteResult{deletedCount=0}

//無條件全查
FindIterable<Document> find = collection.find();
//帶條件查詢
Bson eq = Filters.regex("name", "張");
FindIterable<Document> find = collection.find(eq);

//全查
FindIterable<Document> find = collection.find();
//創(chuàng)建一個實(shí)體類集合準(zhǔn)備接收結(jié)果
List<Student>  slist = new ArrayList<Student>();
//獲取結(jié)果集迭代器對象	
MongoCursor<Document> iterator = find.iterator();
while(iterator.hasNext()) {
	Student s =  new Student();
	Document next = iterator.next();
	s.setSname(next.getString("name"));
	s.setSsex(next.getString("sex"));
	s.setSid(next.getInteger("sid"));	
    //將結(jié)果添加至實(shí)體類集合
	slist.add(s);
}