MongoDB資料匯總

Mongodb是一個比較流行的nosql軟體，windows linux mac平台上都有發行版本，經過測試，效率還是非常不錯的，但是對記憶體的消耗非常大，因為使用了mapviewoffile，即直接將硬碟資料對應到記憶體，因此需要整片記憶體去載入（http://www.cnblogs.com/daizhj/archive/2011/04/25/mongos_mmap_source_code.html）。記憶體監控和管理還是非常重要的。

資料匯總：

mongodb下載：http://www.mongodb.org/display/DOCS/Quickstart

Java對應驅動：https://github.com/mongodb/mongo-java-driver/downloads

《10天掌握MongoDB》2012翻新完整版.pdf" http://vdisk.weibo.com/s/7-tgW

"MongoDB The Definitive Guide.pdf" http://vdisk.weibo.com/s/7AF7f

其他資料：

http://blog.nosqlfan.com/tags/mongodb
http://www.cnblogs.com/hoojo/archive/2011/06/02/2068665.html

深入瞭解mongodb，源碼解析：http://www.cnblogs.com/daizhj/category/260889.html

//附：java基本操作

package org.senma.test.mongo;

/**
* Copyright (C) 2008 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

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();
}
}