最后,还是给出更新document的完整例子:
package com.liao;
import java.net.UnknownHostException;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.Mongo;
import com.mongodb.MongoException;
publicclass UpdateDocumentApp {
publicstaticvoid printAllDocuments(DBCollection collection){
DBCursor cursor = collection.find();
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
}
publicstaticvoid removeAllDocuments(DBCollection collection){
collection.remove(new BasicDBObject());
}
publicstaticvoid insertDummyDocuments(DBCollection collection){
BasicDBObject document = new BasicDBObject();
document.put("hosting", "hostA");
document.put("type", "vps");
document.put("clients", 1000);
BasicDBObject document2 = new BasicDBObject();
document2.put("hosting", "hostB");
document2.put("type", "dedicated server");
document2.put("clients", 100);
BasicDBObject document3 = new BasicDBObject();
document3.put("hosting", "hostC");
document3.put("type", "vps");
document3.put("clients", 900);
collection.insert(document);
collection.insert(document2);
collection.insert(document3);
}
publicstaticvoid main(String[] args) {
try {
Mongo mongo = new Mongo("localhost", 27017);
DB db = mongo.getDB("yourdb");
DBCollection collection = db.getCollection("dummyColl");
System.out.println("Testing 1...");
insertDummyDocuments(collection);
//find hosting = hostB, and update it with new document
BasicDBObject newDocument = new BasicDBObject();
newDocument.put("hosting", "hostB");
newDocument.put("type", "shared host");
newDocument.put("clients", 111);
collection.update(new BasicDBObject().append("hosting", "hostB"), newDocument);
printAllDocuments(collection);
removeAllDocuments(collection);
System.out.println("Testing 2...");
insertDummyDocuments(collection);
BasicDBObject newDocument2 = new BasicDBObject().append("$inc",
new BasicDBObject().append("clients", 99));
collection.update(new BasicDBObject().append("hosting", "hostB"), newDocument2);
printAllDocuments(collection);
removeAllDocuments(collection);
System.out.println("Testing 3...");
insertDummyDocuments(collection);
BasicDBObject newDocument3 = new BasicDBObject().append("$set",
new BasicDBObject().append("type", "dedicated server"));
collection.update(new BasicDBObject().append("hosting", "hostA"), newDocument3);
printAllDocuments(collection);
removeAllDocuments(collection);
System.out.println("Testing 4...");
insertDummyDocuments(collection);
BasicDBObject updateQuery = new BasicDBObject().append("$set",
new BasicDBObject().append("clients", "888"));
collection.update(
new BasicDBObject().append("type", "vps"), updateQuery, false, true);
printAllDocuments(collection);
removeAllDocuments(collection);
System.out.println("Done");
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (MongoException e) {
e.printStackTrace();
}
}
}
import java.net.UnknownHostException;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.Mongo;
import com.mongodb.MongoException;
publicclass UpdateDocumentApp {
publicstaticvoid printAllDocuments(DBCollection collection){
DBCursor cursor = collection.find();
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
}
publicstaticvoid removeAllDocuments(DBCollection collection){
collection.remove(new BasicDBObject());
}
publicstaticvoid insertDummyDocuments(DBCollection collection){
BasicDBObject document = new BasicDBObject();
document.put("hosting", "hostA");
document.put("type", "vps");
document.put("clients", 1000);
BasicDBObject document2 = new BasicDBObject();
document2.put("hosting", "hostB");
document2.put("type", "dedicated server");
document2.put("clients", 100);
BasicDBObject document3 = new BasicDBObject();
document3.put("hosting", "hostC");
document3.put("type", "vps");
document3.put("clients", 900);
collection.insert(document);
collection.insert(document2);
collection.insert(document3);
}
publicstaticvoid main(String[] args) {
try {
Mongo mongo = new Mongo("localhost", 27017);
DB db = mongo.getDB("yourdb");
DBCollection collection = db.getCollection("dummyColl");
System.out.println("Testing 1...");
insertDummyDocuments(collection);
//find hosting = hostB, and update it with new document
BasicDBObject newDocument = new BasicDBObject();
newDocument.put("hosting", "hostB");
newDocument.put("type", "shared host");
newDocument.put("clients", 111);
collection.update(new BasicDBObject().append("hosting", "hostB"), newDocument);
printAllDocuments(collection);
removeAllDocuments(collection);
System.out.println("Testing 2...");
insertDummyDocuments(collection);
BasicDBObject newDocument2 = new BasicDBObject().append("$inc",
new BasicDBObject().append("clients", 99));
collection.update(new BasicDBObject().append("hosting", "hostB"), newDocument2);
printAllDocuments(collection);
removeAllDocuments(collection);
System.out.println("Testing 3...");
insertDummyDocuments(collection);
BasicDBObject newDocument3 = new BasicDBObject().append("$set",
new BasicDBObject().append("type", "dedicated server"));
collection.update(new BasicDBObject().append("hosting", "hostA"), newDocument3);
printAllDocuments(collection);
removeAllDocuments(collection);
System.out.println("Testing 4...");
insertDummyDocuments(collection);
BasicDBObject updateQuery = new BasicDBObject().append("$set",
new BasicDBObject().append("clients", "888"));
collection.update(
new BasicDBObject().append("type", "vps"), updateQuery, false, true);
printAllDocuments(collection);
removeAllDocuments(collection);
System.out.println("Done");
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (MongoException e) {
e.printStackTrace();
}
}
}