mongo-java-driver/examples/QuickTour.java at master · alphaadidas/mongo-java-driver · GitHub

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import com.mongodb.Mongo;

import com.mongodb.DBCollection;

import com.mongodb.BasicDBObject;

import com.mongodb.DBObject;

import com.mongodb.DBCursor;

import com.mongodb.DB;

import java.util.Set;

import java.util.List;

public class QuickTour {

public static void main(String[] args) throws Exception {

// connect to the local database server

Mongo m = new Mongo();

// get handle to "mydb"

DB db = m.getDB( "mydb" );

// Authenticate - optional

// boolean auth = db.authenticate("foo", "bar");

// get a list of the collections in this database and print them out

Set<String> colls = db.getCollectionNames();

for (String s : colls) {

System.out.println(s);

}

// get a collection object to work with

DBCollection coll = db.getCollection("testCollection");

// drop all the data in it

coll.drop();

// make a document and insert it

BasicDBObject doc = new BasicDBObject();

doc.put("name", "MongoDB");

doc.put("type", "database");

doc.put("count", 1);

BasicDBObject info = new BasicDBObject();

info.put("x", 203);

info.put("y", 102);

doc.put("info", info);

coll.insert(doc);

// get it (since it's the only one in there since we dropped the rest earlier on)

DBObject myDoc = coll.findOne();

System.out.println(myDoc);

// now, lets add lots of little documents to the collection so we can explore queries and cursors

for (int i=0; i < 100; i++) {

coll.insert(new BasicDBObject().append("i", i));

}

System.out.println("total # of documents after inserting 100 small ones (should be 101) " + coll.getCount());

// lets get all the documents in the collection and print them out

DBCursor cur = coll.find();

while(cur.hasNext()) {

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

}

// now use a query to get 1 document out

BasicDBObject query = new BasicDBObject();

query.put("i", 71);

cur = coll.find(query);

while(cur.hasNext()) {

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

}

// now use a range query to get a larger subset

query = new BasicDBObject();

query.put("i", new BasicDBObject("$gt", 50)); // i.e. find all where i > 50

cur = coll.find(query);

while(cur.hasNext()) {

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

}

// range query with multiple contstraings

query = new BasicDBObject();

query.put("i", new BasicDBObject("$gt", 20).append("$lte", 30)); // i.e. 20 < i <= 30

cur = coll.find(query);

while(cur.hasNext()) {

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

}

// create an index on the "i" field

coll.createIndex(new BasicDBObject("i", 1)); // create index on "i", ascending

// list the indexes on the collection

List<DBObject> list = coll.getIndexInfo();

for (DBObject o : list) {

System.out.println(o);

}

// See if the last operation had an error

System.out.println("Last error : " + db.getLastError());

// see if any previous operation had an error

System.out.println("Previous error : " + db.getPreviousError());

// force an error

db.forceError();

// See if the last operation had an error

System.out.println("Last error : " + db.getLastError());

db.resetError();

}

mongo-java-driver/examples/QuickTour.java at master · alphaadidas/mongo-java-driver · GitHub

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