Java和MongoDB之Hello World
1.新建Project新建Java Project，并把mongo-java-driver驱动加入到项目bulid path中，如果你使用的是maven增加依赖。
org.mongodb
mongo-java-driver
2.10.1
2.连接上MongoDB
//>2.10版本
MongoClient mongo = new MongoClient( "localhost" , 27017 );
//老版本
Mongo mongo = new Mongo("localhost", 27017); 如果需要验证，需要输入用户名和密码
MongoClient mongoClient = new MongoClient();
DB db = mongoClient.getDB("database name");
boolean auth = db.authenticate("username", "password".toCharArray());
3.MongoDB数据库 得到MongoDB中的数据库，如果数据库名不存在，MongoDB会自动创建
DB db = mongo.getDB("database name");
显示所有的数据库
List dbs = mongo.getDatabaseNames();
for(String db : dbs){
System.out.println(db);
}
4.MongoDB Collection（MongoDB表） 得到数据库中的表
DB db = mongo.getDB("testdb");
DBCollection table = db.getCollection("user");
显示数据库中的所有表
DB db = mongo.getDB("testdb");
Set tables = db.getCollectionNames();
for(String coll : tables){
System.out.println(coll);
}
5.插入、查找、更新、删除操作 插入数据，向Collection（表）中插入一个Document
DBCollection table = db.getCollection("user");
BasicDBObject document = new BasicDBObject();
document.put("name", "qiyadeng");
document.put("age", 30);
document.put("createdDate", new Date());
table.insert(document);
更新Document中的name="qiyadeng.com"
DBCollection table = db.getCollection("user");
BasicDBObject query = new BasicDBObject();
query.put("name", "qiyadeng");
BasicDBObject newDocument = new BasicDBObject();
newDocument.put("name", "qiyadeng.com");
BasicDBObject updateObj = new BasicDBObject();
updateObj.put("$set", newDocument);
table.update(query, updateObj);
从Collection中查找name="qiyadeng.com"的Document
DBCollection table = db.getCollection("user");
BasicDBObject searchQuery = new BasicDBObject();
searchQuery.put("name", "qiyadeng.com");
DBCursor cursor = table.find(searchQuery);
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
删除name="qiyadeng"的Document
DBCollection table = db.getCollection("user");
BasicDBObject searchQuery = new BasicDBObject();
searchQuery.put("name", "qiyadeng.com");
table.remove(searchQuery);
6.完整的例子
package com.qiyadeng.mongodb;
import java.util.Date;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.MongoClient;
public class MongoDBSample {
public static void main(String[] args) throws Exception{
/**** Connect to MongoDB ****/
//2.10.0后,使用MongoClient
MongoClient mongo = new MongoClient("localhost", 27017);
/**** Get database ****/
// if database doesn't exists, MongoDB will create it for you
DB db = mongo.getDB("testdb");
/**** Get collection / table from 'testdb' ****/
// if collection doesn't exists, MongoDB will create it for you
DBCollection table = db.getCollection("user");
/**** Insert ****/
// create a document to store key and value
BasicDBObject document = new BasicDBObject();
document.put("name", "qiyadeng");
document.put("age", 30);
document.put("createdDate", new Date());
table.insert(document);
/**** Find and display ****/
BasicDBObject searchQuery = new BasicDBObject();
searchQuery.put("name", "qiyadeng");
DBCursor cursor = table.find(searchQuery);
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
/**** Update ****/
// search document where name="qiyadeng" and update it with new values
BasicDBObject query = new BasicDBObject();
query.put("name", "qiyadeng");
BasicDBObject newDocument = new BasicDBObject();
newDocument.put("name", "qiyadeng.com");
BasicDBObject updateObj = new BasicDBObject();
updateObj.put("$set", newDocument);
table.update(query, updateObj);
/**** Find and display ****/
BasicDBObject searchQuery2
= new BasicDBObject().append("name", "qiyadeng.com");
DBCursor cursor2 = table.find(searchQuery2);
while (cursor2.hasNext()) {
System.out.println(cursor2.next());
}
}
}
输出
{ "_id" : { "$oid" : "51444c88874c79654063356b"} , "name" : "qiyadeng" , "age" : 30 , "createdDate" : { "$date" : "2013-03-16T10:42:16.555Z"}}
{ "_id" : { "$oid" : "51444c88874c79654063356b"} , "age" : 30 , "createdDate" : { "$date" : "2013-03-16T10:42:16.555Z"} , "name" : "qiyadeng.com"}
使用mongo验证创建的数据库testdb，collection user是否存在。
http://www.qiyadeng.com/wp-content/uploads/2013/03/20130316184820_29515.jpg
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