Shulou(Shulou.com)06/01 Report--

Click on the jar package of MongoDB to see that there are many methods for the Mongo class, including getAddress (), dropDatabase (String), getDB (String), and so on. Let's demonstrate the use of Mongo.class one by one.

The demonstration of Mongo is mainly done in a test class, so I set up a java class for JUnitTest_1 here. The main code is as follows, because the comments are rich, they will not be explained one by one.

Import com.mongodb.Mongo

Public class JUnitTest_1 {

@ Test

Public void test1 () throws Exception {

Mongo mongo = new Mongo ()

/ / get all databases

List dbs = mongo.getDatabaseNames ()

For (String db: dbs) {

System.out.println (db)

}

/ / get the version of the current MongoDB

System.out.println ("mongo version =" + mongo.getVersion ())

/ / get the server address

System.out.println ("mongo server address =" + mongo.getAddress ())

/ / Delete a database

/ / mongo.dropDatabase ("test")

/ / you can also view the maximum setting value of the BSON document

System.out.println ("bsonObjectSize =" + mongo.getMaxBsonObjectSize ())

/ / debugString

System.out.println ("debugString =" + mongo.debugString ())

Mongo.close ()

}

}

Running on my computer, the output is as follows:

Local

Test

Mongo version = 2.10.1

Mongo server address = / 127.0.0.1purl 27017

BsonObjectSize = 16777216

DebugString = DBTCPConnector: / 127.0.0.1 27017 / 127.0.0.1 purl 27017

In practice, it is recommended to use MongoClient instead of the Mongo class. MongoClient is thread-safe and can share the same instance among multiple threads. The test code for calling the MongoClient class is as follows

Public void test2 () throws Exception {

MongoClient client = new MongoClient ()

/ / query all current databases

List dbs = client.getDatabaseNames ()

For (String db: dbs) {

System.out.println (db)

}

/ / get the version of the current MongoDB

System.out.println ("mongo version =" + client.getVersion ())

/ / get the server address

System.out.println ("mongo server address =" + client.getAddress ())

/ / Delete a database

/ / client.dropDatabase ("test")

/ / you can also view the maximum setting value of the BSON document

System.out.println ("bsonObjectSize =" + client.getMaxBsonObjectSize ())

/ / debugString

System.out.println ("debugString =" + client.debugString ())

Client.close ()

}

The printed results are shown in one.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.