java操作mongoDB数据库的简单实例

首先导入mongoDB的jar包http://pan.baidu.com/s/1bnGMJRD

 

//DataBase.java

package com.mongodb.test;

import java.net.UnknownHostException;

import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.Mongo;
import com.mongodb.MongoException;
import com.mongodb.util.JSON;

public class DataBase {
 public static void main(String[] args)
  throws UnknownHostException, MongoException {
  //1.建立一个Mongo的数据库连接对象
  Mongo mg = new Mongo("127.0.0.1:27017");
        //查询所有的Database
        for (String name : mg.getDatabaseNames()) {
            System.out.println("dbName: " + name);
        }
        //2.创建相关数据库的连接
        DB db = mg.getDB("foobar");
        //查询数据库所有的集合
        for (String name : db.getCollectionNames()) {
            System.out.println("collectionName: " + name);
        }
       
        DBCollection users = db.getCollection("persons");
        //查询所有的数据
        DBCursor cur = users.find();
        while (cur.hasNext()) {
         DBObject object = cur.next();
         System.out.println(object.get("name"));
        }
        System.out.println(cur.count());
        System.out.println(cur.getCursorId());
        System.out.println(JSON.serialize(cur));
    }
}
//MongoDb.java

package com.mongodb.test;

import java.net.UnknownHostException;
import java.util.List;

import org.bson.types.ObjectId;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.Mongo;
import com.mongodb.MongoException;

public class MongoDb {
 //1.建立一个Mongo的数据库连接对象
 static Mongo connection = null;
 //2.创建相关数据库的连接
 static DB db = null;
 public MongoDb(String dbName) throws UnknownHostException, MongoException{
  connection = new Mongo("127.0.0.1:27017");
  db = connection.getDB(dbName);
 }
 public static void main(String[] args) throws UnknownHostException, MongoException {
  //实例化
  MongoDb mongoDb = new MongoDb("foobar");
     /**
      * 1.创建一个名字叫javadb的数据库
      */
//  mongoDb.createCollection("javadb");
  /**
   * 2.为集合javadb添加一条数据
   */
//  DBObject dbs = new BasicDBObject();
//  dbs.put("name", "uspcat.com");
//  dbs.put("age", 2);
//  List<String>  books = new ArrayList<String>();
//  books.add("EXTJS");
//  books.add("MONGODB");
//  dbs.put("books", books);
//  mongoDb.insert(dbs, "javadb");
  /**
   * 3.批量插入数据
   */
//  List<DBObject> dbObjects = new ArrayList<DBObject>();
//  DBObject jim = new BasicDBObject("name","jim");
//  DBObject lisi = new BasicDBObject("name","lisi");
//  dbObjects.add(jim);
//  dbObjects.add(lisi);
//  mongoDb.insertBatch(dbObjects, "javadb");
  /**
   * 4.根据ID删除数据
   */
//  mongoDb.deleteById("502870dab9c368bf5b151a04", "javadb");
  /**
   * 5.根据条件删除数据
   */
//  DBObject lisi = new BasicDBObject();
//  lisi.put("name", "lisi");
//  int count = mongoDb.deleteByDbs(lisi, "javadb");
//  System.out.println("删除数据的条数是: "+count);
  /**
   * 6.更新操作,为集合增加email属性
   */
//  DBObject update = new BasicDBObject();
//  update.put("$set",
//    new BasicDBObject("eamil","test
@126.com"));
//  mongoDb.update(new BasicDBObject(),
//    update,false,true,"javadb");
  /**
   * 7.查询出persons集合中的name和age
   */
//  DBObject keys = new BasicDBObject();
//  keys.put("_id", false);
//  keys.put("name", true);
//  keys.put("age", true);
//  DBCursor cursor = mongoDb.find(null, keys, "persons");
//     while (cursor.hasNext()) {
//      DBObject object = cursor.next();
//      System.out.println(object.get("name"));
//     }
     /**
      * 7.查询出年龄大于26岁并且英语成绩小于80分
      */
//  DBObject ref = new BasicDBObject();
//  ref.put("age", new BasicDBObject("$gte",26));
//  ref.put("e", new BasicDBObject("$lte",80));
//  DBCursor cursor = mongoDb.find(ref, null, "persons");
//     while (cursor.hasNext()) {
//      DBObject object = cursor.next();
//      System.out.print(object.get("name")+"-->");
//      System.out.print(object.get("age")+"-->");
//      System.out.println(object.get("e"));
//     }
  /**
   * 8.分页例子
   */
  DBCursor cursor = mongoDb.find(null, null, 0, 3, "persons");
     while (cursor.hasNext()) {
      DBObject object = cursor.next();
      System.out.print(object.get("name")+"-->");
      System.out.print(object.get("age")+"-->");
      System.out.println(object.get("e"));
     }  
  //关闭连接对象
  connection.close();
 }
 /**
  * 穿件一个数据库集合
  * @param collName 集合名称
  * @param db  数据库实例
  */
 public void createCollection(String collName){
  DBObject dbs = new BasicDBObject();
  db.createCollection("javadb", dbs);
 }
 /**
  * 为相应的集合添加数据
  * @param dbs
  * @param collName
  */
 public void insert(DBObject dbs,String collName){
  //1.得到集合
  DBCollection coll = db.getCollection(collName);
  //2.插入操作
  coll.insert(dbs);
 }
 /**
  * 为集合批量插入数据
  * @param dbses
  * @param collName
  */
 public void insertBatch(List<DBObject> dbses,String collName){
  //1.得到集合
  DBCollection coll = db.getCollection(collName);
  //2.插入操作
  coll.insert(dbses);
 }
 /**
  * 根据id删除数据
  * @param id
  * @param collName
  * @return 返回影响的数据条数
  */
 public int deleteById(String id,String collName){
  //1.得到集合
  DBCollection coll = db.getCollection(collName);
  DBObject dbs = new BasicDBObject("_id", new ObjectId(id));
  int count = coll.remove(dbs).getN();
  return count;
 }
 /**
  * 根据条件删除数据
  * @param id
  * @param collName
  * @return 返回影响的数据条数
  */ 
 public int deleteByDbs(DBObject dbs,String collName){
  //1.得到集合
  DBCollection coll = db.getCollection(collName);
  int count = coll.remove(dbs).getN();
  return count;
 }
 /**
  * 更新数据
  * @param find 查询器
  * @param update 更新器
  * @param upsert 更新或插入
  * @param multi 是否批量更新
  * @param collName 集合名称
  * @return 返回影响的数据条数
  */
 public int update(DBObject find,
      DBObject update,
      boolean upsert,
      boolean multi,
      String collName){
  //1.得到集合
  DBCollection coll = db.getCollection(collName);
  int count = coll.update(find, update, upsert, multi).getN();
  return count;
 }
 /**
  * 查询器(分页)
  * @param ref
  * @param keys
  * @param start
  * @param limit
  * @return
  */
 public DBCursor find(DBObject ref,
   DBObject keys,
   int start,
   int limit,
   String collName){
  DBCursor cur = find(ref, keys, collName);
  return cur.limit(limit).skip(start);
 }
 /**
  * 查询器(不分页)
  * @param ref
  * @param keys
  * @param start
  * @param limit
  * @param collName
  * @return
  */
 public DBCursor find(DBObject ref,
   DBObject keys,
   String collName){
  //1.得到集合
  DBCollection coll = db.getCollection(collName);
  DBCursor cur = coll.find(ref, keys);
  return cur;
 } 
}

 

java操作mongoDB数据库的简单实例,古老的榕树,5-wow.com

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