Examples of com.mongodb.MongoClient

com.mongodb.MongoClient
ongodb.org/display/DOCS/Replica+Sets">replica set using the Java driver by passing a ServerAddress list to the MongoClient constructor. For example:
```
 MongoClient mongoClient = new MongoClient(Arrays.asList( new ServerAddress("localhost", 27017), new ServerAddress("localhost", 27018), new ServerAddress("localhost", 27019))); 
```
You can connect to a sharded cluster using the same constructor. MongoClient will auto-detect whether the servers are a list of replica set members or a list of mongos servers.

By default, all read and write operations will be made on the primary, but it's possible to read from secondaries by changing the read preference:
```
 mongoClient.setReadPreference(ReadPreference.secondaryPreferred()); 
```
By default, all write operations will wait for acknowledgment by the server, as the default write concern is {@code WriteConcern.ACKNOWLEDGED}.

Note: This class supersedes the {@code Mongo} class. While it extends {@code Mongo}, it differs from it in that the default write concern is to wait for acknowledgment from the server of all write operations. In addition, its constructors accept instances of {@code MongoClientOptions} and {@code MongoClientURI}, which both also set the same default write concern.

In general, users of this class will pick up all of the default options specified in {@code MongoClientOptions}. In particular, note that the default value of the connectionsPerHost option has been increased to 100 from the old default value of 10 used by the superseded {@code Mongo} class.
@see ReadPreference#primary() @see com.mongodb.WriteConcern#ACKNOWLEDGED @see MongoClientOptions @see MongoClientURI @since 2.10.0

                throw new ManifoldCFException("GridFS: Metadata URL field cannot be empty.");
            }


            if (StringUtils.isEmpty(host) && StringUtils.isEmpty(port)) {
                try {
                    session = new MongoClient().getDB(db);
                } catch (UnknownHostException ex) {
                    throw new ManifoldCFException("GridFS: Default host is not found. Does mongod process run?" + ex.getMessage(), ex);
                }
            } else if (!StringUtils.isEmpty(host) && StringUtils.isEmpty(port)) {
                try {
                    session = new MongoClient(host).getDB(db);
                } catch (UnknownHostException ex) {
                    throw new ManifoldCFException("GridFS: Given host information is not valid or mongod process doesn't run" + ex.getMessage(), ex);
                }
            } else if (!StringUtils.isEmpty(host) && !StringUtils.isEmpty(port)) {
                try {
                    int integerPort = Integer.parseInt(port);
                    session = new MongoClient(host, integerPort).getDB(db);
                } catch (UnknownHostException ex) {
                    throw new ManifoldCFException("GridFS: Given information is not valid or mongod process doesn't run" + ex.getMessage(), ex);
                } catch (NumberFormatException ex) {
                    throw new ManifoldCFException("GridFS: Given port is not valid number. " + ex.getMessage(), ex);
                }
            } else if (StringUtils.isEmpty(host) && !StringUtils.isEmpty(port)) {
                try {
                    int integerPort = Integer.parseInt(port);
                    session = new MongoClient(host, integerPort).getDB(db);
                } catch (UnknownHostException ex) {
                    throw new ManifoldCFException("GridFS: Given information is not valid or mongod process doesn't run" + ex.getMessage(), ex);
                } catch (NumberFormatException ex) {
                    throw new ManifoldCFException("GridFS: Given port is not valid number. " + ex.getMessage(), ex);
                }

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import java.net.UnknownHostException;
import java.util.Random;


public class DotNotationTest {
    public static void main(String[] args) throws UnknownHostException {
        MongoClient client = new MongoClient();
        DB db = client.getDB("course");
        DBCollection lines = db.getCollection("DotNotationTest");
        lines.drop();
        Random rand = new Random();


        // insert 10 lines with random start and end points

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                true, true);
        return (Integer) doc.get("counter") - range + 1;
   }


    private static DBCollection createCollection() throws UnknownHostException {
        MongoClient client = new MongoClient();
        DB db = client.getDB("course");
        return db.getCollection("FindModifyTest");
    }

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        collection.remove(new BasicDBObject("_id", "frank"));
    }


    private static DBCollection createCollection() throws UnknownHostException {
        MongoClient client = new MongoClient();
        DB db = client.getDB("course");
        DBCollection collection = db.getCollection("UpdateRemoveTest");
        collection.drop();
        return collection;
    }

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import java.net.UnknownHostException;


public class InsertTest {
    public static void main(String[] args) throws UnknownHostException {
        MongoClient client = new MongoClient();
        DB courseDB = client.getDB("course");
        DBCollection collection = courseDB.getCollection("insertTest");


        collection.drop();


        DBObject doc = new BasicDBObject().append("x", 1);

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import java.net.UnknownHostException;
import java.util.Random;


public class FieldSelectionTest {
    public static void main(String[] args) throws UnknownHostException {
        MongoClient client = new MongoClient();
        DB db = client.getDB("course");
        DBCollection collection = db.getCollection("fieldSelectionTest");
        collection.drop();
        Random rand = new Random();


        // insert 10 documents with two random integers

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import java.net.UnknownHostException;
import java.util.Random;


public class FindTest {
    public static void main(String[] args) throws UnknownHostException {
        MongoClient client = new MongoClient();
        DB db = client.getDB("course");
        DBCollection collection = db.getCollection("findTest");
        collection.drop();


        // insert 10 documents with a random integer as the value of field "x"
        for (int i = 0; i < 10; i++) {

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import java.net.UnknownHostException;
import java.util.Random;


public class FindCriteriaTest {
    public static void main(String[] args) throws UnknownHostException {
        MongoClient client = new MongoClient();
        DB db = client.getDB("course");
        DBCollection collection = db.getCollection("findCriteriaTest");
        collection.drop();


        // insert 10 documents with two random integers
        for (int i = 0; i < 10; i++) {

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import java.net.UnknownHostException;
import java.util.Random;


public class SortSkipLimitTest {
    public static void main(String[] args) throws UnknownHostException {
        MongoClient client = new MongoClient();
        DB db = client.getDB("course");
        DBCollection lines = db.getCollection("SortSkipLimitTest");
        lines.drop();
        Random rand = new Random();


        // insert 10 lines with random start and end points

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        collection.remove(new BasicDBObject("_id", "frank"));
    }


    private static DBCollection createCollection() throws UnknownHostException {
        MongoClient client = new MongoClient();
        DB db = client.getDB("students");
        DBCollection collection = db.getCollection("grades");
        //collection.drop();
        return collection;
    }

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