[MongoDB] MongoDB and Java use crud together

Summary:

1. [MongoDB] Installing MongoDB
2. [Mongodb]mongo Basic use:
3. [Advantages and disadvantages of mongodb]mongodb and comparison with relational database
4. [Mongodb]mongodb and Java use crud together

It is also fairly simple to use, because MongoDB is a database of class files, so it is very convenient to operate.

First download the corresponding jar package, here I directly use MAVEN automatically, the following is the configuration in the Pom file:

<dependency>

<groupId>junit</groupId>

<artifactid>junit</artifactid>

<version>4.8.2</version>

</Dependency>

<dependency>

<groupId>org.mongodb</groupId>

<artifactid>MONGO-java-driver</artifactid>

<version>2.7.2</version>

</Dependency>

A MongoDB jar package and a junit jar package, you can

You can then start writing code that is called directly in the main method of a Java class:

Public static void main (string[] args) throws exception{

// Create a Mongo instances, using local "127.0.0.1" by default, 27017

Mongo mongo1j = new Mongo ();

// Use ip+ port number creation

Mongo Mongo = new Mongo ("127.0.0.1", 27017);

// get the names of all databases

For (String name:mongo.getDatabaseNames ()) {

System. out. println ("DbName:" + name);

}

// get a database for subsequent operations on the database

DB db = Mongo.getdb ("student");

For (String name:db.getCollectionNames ()) {

System. out. println ("CollectionName:" + name);

}

// get the corresponding set

Dbcollection students = db.getcollection ("student");

// querying data in all collections

dbcursor cur = students.find ();

// iterate through all the contents of the collection

While (Cur.hasnext ()) {

System. out. println (Cur.next ());

}

System. out. println ("Cur.count ():" + Cur.count ());

System. out. println ("Cur.getcursorid ():" + Cur.getcursorid ());

System. out. println ("json.serialize ():" + JSON. Serialize(cur));

//DELETE Operation

Students.remove (new basicdbobject ("name", "YANGJX"));

System. out. println ("Cur.count ():" + Cur.count ());

//ADD Operation

DBObject student = new basicdbobject ();

Student.put ("name", "YANGJX");

Student.put ("Age", "the");

Students.save (student);

System. out. println ("Cur.count ():" + Cur.count ());

//UPDATE Operation

DBObject updateobj = new basicdbobject ();

Updateobj.put ("Age", +);

Updateobj.put ("name", "Zhanggy");

Updateobj.put ("Extra", "Markhere");

Students.update (new basicdbobject ("Age", "updateobj");

System. out. println (JSON. Serialize(Students.find (new basicdbobject ("name", "Zhanggy" )));

}

After the execution of the above code is completed, it will be printed as follows:

dbname:local

dbname:student

Collectionname:colname

collectionname:student

collectionName:system.indexes

{"_id": {"$oid": "555ae83a09668180fadccdeb"}, "Age":

{"_id": {"$oid": "555ae84009668180fadccdec"}, "name": "Zhangyc", "Age": 29.0, "Sex": true}

{"_id": {"$oid": "555ae84709668180fadccded"}, "name": "Zhangyyq", "Age": 30.0, "Sex": true}

{"_id": {"$oid": "555aebdb09b332c5a188b620"}, "passwd": "1234"}

{"_id": {"$oid": "555d80d7b7a5042665b195ae"}, "name": "Yangjx", "Age" :

Cur.count (): 5

Cur.getcursorid (): 0

json.serialize (): [{"_id": {"$oid": "555ae83a09668180fadccdeb"}, "Age": +}, {"_id": {"$oid": "555ae840096 68180fadccdec "}," name ":" Zhangyc "," Age ": 29.0," Sex ": true}, {" _id ": {" $oid ":" 555ae84709668180fadccded "}," Name ":" Zhangyyq "," Age ": 30.0," Sex ": true}, {" _id ": {" $oid ":" 555aebdb09b332c5a188b620 "}," passwd ":" 1234 "} {"_id": {"$oid": "555d80d7b7a5042665b195ae"}, "name": "Yangjx", "Age" :--}]

Cur.count (): 4

Cur.count (): 5

[{"_id": {"$oid": "555ae83a09668180fadccdeb"}, "age": +, "name": "Zhanggy", "Extra": "Markhere"}]

Reference:

Http://www.cnblogs.com/hoojo/archive/2011/06/02/2068665.html

[MongoDB] MongoDB and Java use crud together