MongoDB Quick Start Note (eight) MongoDB Java driver Operation code explanation _MARIADB

MongoDB Java driver is thread-safe, for general applications, as long as a MONGO instance, MONGO has a built-in connection pool (pool size defaults to 10).

The following code gives you an introduction to the Java-driven operations of MongoDB, as shown in the following code:

Import java.util.ArrayList;
Import java.util.List;
Import Java.util.regex.Pattern;
Import org.bson.Document;
Import com.mongodb.MongoClient;
Import com.mongodb.MongoCredential;
Import com.mongodb.ServerAddress;
Import com.mongodb.client.FindIterable;
Import com.mongodb.client.MongoCollection;
Import Com.mongodb.client.MongoCursor;
Import Com.mongodb.client.MongoDatabase; public class Mongozyh {public static void main (string[] args) {try {//Connect to MongoDB Service, serveraddress () Two parameters are server address and port S
Erveraddress serveraddress = new ServerAddress ("localhost", 27017);
list<serveraddress> Addrs = new arraylist<serveraddress> ();
Addrs.add (serveraddress); Three parameters are user name database name password mongocredential credential = mongocredential. Createscramsha1credential ("Zyh", "admin", "zyh". ToC
Hararray ());
List<mongocredential> credentials = new arraylist<mongocredential> ();
Credentials.add (credential);
Obtain MongoDB connection Mongoclient via connection authentication mongoclient = new Mongoclient (Addrs, credentials); Connecting to DataLibrary Mongodatabase mongodatabase = mongoclient.getdatabase ("Zyhdb");
Creates a new collection and creates a new empty set//Mongodatabase.createcollection ("student") in the database after execution;
System.out.println ("new collection succeeded");
Gets the collection and inserts data into the collection mongocollection<document> mongocollection = mongodatabase. GetCollection ("student");
Insert a piece of data//Document document = new document ();
Document.append ("name", "Zhangsan");
Document.append ("Age", 28);
Mongocollection.insertone (document);
System.out.println ("Insert a piece of data successfully");
Insert multiple data//list<document> documentlist = new arraylist<document> ();
Document Document1 = new document ();
Document1.append ("name", "Lisi");
Document1.append ("Age", 28);
Document1.append ("Sex", "male");
Document Document2 = new document ();
Document2.append ("name", "Wangwu");
Document2.append ("Age", 31);
Document2.append ("Sex", "male");
Documentlist.add (Document1);
Documentlist.add (Document2);
Mongocollection.insertmany (documentlist);
System.out.println ("Insert multiple data successfully"); Query data//queryAll data in the collection//finditerable<document> finditerable = Mongocollection.find ();
mongocursor<document> mongocursor = Finditerable.iterator (); while (Mongocursor.hasnext ()) {//System.out.println (Mongocursor.next ());//}//query based on criteria//Document query = new Docum
ENT ();
Query.put ("Age", New Document ("$lt", 30));
Query.put ("Sex", "male");
Query.put ("name", query);
Regular expression query//pattern = Pattern.compile ("^zhang");
Query.put ("name", pattern);
Sort//Document sort = new Document (); Sort.put ("Name",-1);
1 is a positive sequence,-1 is reverse//finditerable<document> finditerable = mongocollection.find (query)//. Sort (sort);
mongocursor<document> mongocursor = Finditerable.iterator (); while (Mongocursor.hasnext ()) {//Document doc = Mongocursor.next ();//System.out.print ("Name:" + doc.get ("name") + "
...");
System.out.print ("Age:" + doc.get ("age") + "...");
System.out.println ("Sex:" + doc.get ("sex") + "..."); }//Mongocollection.findoneandupdate (query conditions, modifiedcapacity); Query the first data and modify//mongocollection.findoneanddelete (query conditions); Query out the first data and delete//mongocollection.findoneandreplace (query condition, replace content);
Query the first piece of data and replace//modify data//Document query = new document ();
Query.put ("Age", 28);
Document update = new document ();
Document d = new document ();
D.put ("Birthday", New Date ());
D.put ("name", "Zhangsan");
Update.put ("$set", D); Mongocollection.updateone (query, update);
Modify the first Data//mongocollection.updatemany (query condition, modify content) of the query;//Modify all data//delete data/Document query = new document ();
Query.put ("Age", 28); Mongocollection.deleteone (query); Deletes the first Data//mongocollection.deletemany (query condition) to the query; Delete all data//Mongocollection.drop () from the query;
Delete Collection} catch (Exception e) {e.printstacktrace ();}} }

About small make up to introduce the MongoDB Quick Start Note (eight) of the MongoDB Java driver code to explain so much, I hope to help you, but also to continue to update MongoDB relevant knowledge, please pay attention to cloud Habitat community website!