mongoDB连接数据库

package mongod;
import java.util.List;
import java.util.ArrayList;
import org.bson.types.*;

import com.mongodb.*;


public class mongo {
//  DBObject  o = new BasicDBObject();
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		MongoClient mo = new MongoClient("127.0.0.1",27017);
		DB db = mo.getDB("wtdd");
		
		DBCollection col = db.getCollection("wtd");
		/*
		实现增加集合
		db.createCollection("wtddd!!1", new BasicDBObject()); 
		
		实现插入单个对象，对象中含有数组
		DBObject in = new BasicDBObject();
		in.put("wtd", "wtdd");
		List<String> lis = new ArrayList<String>();
		lis.add("c++");
		lis.add("java");
		in.put("like", lis);
		col.insert(in);
		
		遍历查看元素
		DBObject a = new BasicDBObject();
		a.put("_id", false);
		a.put("like", false);
		 DBCursor dbs = col.find(null,a);
		for(DBObject obj:dbs) {
			System.out.println(obj);
		}
		
		查找单个数据
		DBObject aa = new BasicDBObject("name","jim");
		DBCursor dbs = col.find(aa);
		for(DBObject obj:dbs) {
			System.out.println(obj);
		}
		
		批量加入数据
		DBObject a = new BasicDBObject();
		DBObject b = new BasicDBObject();
		a.put("name",111);
		b.put("name",222);
		List<DBObject> lis = new ArrayList<DBObject>();
		lis.add(a);
		lis.add(b);
		col.insert(lis);
		
		按照id删除，注意id类型
		col.remove(new BasicDBObject("_id",new ObjectId("5cb586965f37024dd0baf262")));// ID是ObjectID类型 
		
		按照name删除数据
		DBObject a = new BasicDBObject("name",111);
		col.remove(a).getN();
		
		update增加列属性
		DBObject a = new BasicDBObject();
		a.put("$set", new BasicDBObject("age",25));
		col.update(new BasicDBObject("name",222), a,false,false)；
		
		查找e大于80，c小于95 的数据
		DBObject a = new BasicDBObject();
		a.put("e", new BasicDBObject("$gt",80));
		a.put("c", new BasicDBObject("$lt",95));
		DBObject b = new BasicDBObject();
		b.put("e", true);
		b.put("c", true);
		DBCursor dbs = col.find(a,b);
		for(DBObject obj:dbs) {
			System.out.println(obj);
		}
		
		实现分页跳转
		DBObject a = new BasicDBObject();
		a.put("name", true);
		a.put("_id", 0);
		DBCursor dbs = col.find(null,a).limit(3).skip(3);
		for(DBObject obj:dbs) {
			System.out.println(obj);
		}
		
		*/
	}
}