[MongoDB基础]-- 操作mongodb数据库

java操作mongodb数据库
 
mongoDB的java驱动
 
1、DBObject对象
如：{name:"suns",pwd:"123"}---------->Map.put("name","suns")----->DBObject是Map的子接口
-------------->BasicDBObject.put("name","suns");
 
2、BasicDBList对象（数组的形式）
["suns","jiangxs","huxz"]------>ArrayList---------->BasicDBList.add("suns")子类
 
3、java编程步骤
a、导入MongDB提供的java驱动jar包
b、创建链接对象----------》负责与数据库的链接
Mongo mongo=new Mongo(ip,port);
c、获得数据库对象
DB db=mongo.getDB("dbname");
d、获得Collection对象
DBCollection dbCollection=db.getCollection("collectionName");
e、调用DBCollection对象的相关方法完成MongoDb的CRUD操作
      (1)dbCollection.insert()------------->db.insert();
      (2)dbCollection.find()    ------------->db.users.find();
      (3)dbCollection.findOne()----------->db.users.findOne();
      (4)dbCollection.update()------------>db.users.update();
      (5)dbCollection.remove()------------>db.users.remove();
 
4、启动Eclipse演示代码
public class TestMongoAPI{
   private Mongo mongo;
   private DB     db;
   private DBCollection dbCollection;
  @Before//初始化方法
   public void init()throws Exception{
       mongo=new Mongo("127.0.0.1","27017");
            db=mongo.getDB("baichi");
      dbCollection=db.getCollection("users");
  }
  /**1、测试插入对象
     *db.users.insert(name:"suns",password:"123456");
     *db.Collection.insert()
     */
  @Test
   public void testInsert(){
    //新建DB对象
     DBObject dbObject=new BasicDBObject();
    dbObject.put("name","suns");
    dbObject.put("password","123456");
    //将值插入数据库中
    dbCollection.insert(dbObject);
    }
   /**
     *执行插入java代码后，检查是否插入MongoDB数据库
     *>db----->>use  baichi----->db.users.find()
     */
   
     /**
      *2、测试插入集合
      *db.users.insert({post,[1,2,3]})
      * dbCollection.insert()
      */
      @Test
       public void testListInsert(){
        BasicDBList  dbList=new BasicDBList();
        dbList.add(1);
        dbList.add(2);
         dbList.add(3);
        //创建对象准备放入集合
         DBObject dbObject=new BasicDBObject();
         dbObject.put("post",dbList);
         dbCollection.insert(dbObject);
       }
         /**
          *3、测试批量数据的插入
          *{name:"suns1",password:"123456"}
          *{name:"suns2",password:"123456"}
          *{name:"suns3",password:"123456"}
          */
          @Test
          public void testBatchIbsert(){
              //创建3个对象，准备存储数据
               DBObject dbObject1=new BasicDBObject();
               DBObject dbObject2=new BasicDBObject();       
               DBObject dbObject3=new BasicDBObject();
              //放入数据到map集合中
               dbObject1.put("name","suns1");
               dbObject1.put("password","123456");
 
               dbObject1.put("name","suns2");
               dbObject1.put("password","123456");
 
               dbObject1.put("name","suns3");
               dbObject1.put("password","123456");
                
                List<DBObject> dbObjects=new ArrayList<DBObject>();
                 dbObjects.add(dbObject1);
                 dbObjects.add(dbObject2);
                 dbObjects.add(dbObject3);
                //重载的方法
                dbCollection.insert(dbObjects);
           }
       /**
         *4、测试数据的查询（一）
         *    db.users.find({name:"suns"});
         *    dbCollection.find()
         */
         @Test
          public void testQuery(){
               DBObject dbObject=new BasicDBObject();
               dbObject.put("name","suns");
               DBCursor  dbCursor=dbCollection.find(dbObject);//添加查询条件dbObject
              //遍历查询结果
              while(dbCursor.hasNext()){
                      System.out.println(dbCursor.next());
              }
          }
         /**
            *5、测试数据的查询（二）
            *db.users.find({name:{$ne:"suns"}});
            * dbCollection.find();
            */
            @Test
             public void testQuery2(){
                //新建需要封装的对象
                DBObject neObject=new BasicDBObject();
                             neObject.put("$ne","suns");   
                 DBObject  nameObject=new BasicDBObject();
                 nameObject.put("name",neObject);
                 //调用对象的方法，执行语句
                 DBCursor    dbcursor=dbCollection.find(nameObject);
                 while(dbcursor.hashNext()){
                        System.out.println("结果:"+dbcursor.next());
                  }
             }
        
           /**
            *6、测试修改数据
            *db.users.update({name:"suns"},{$set:{password:"23564"}},0,1);
            *0位置代表如果不存在，是否插入(0否，1是)；1位置代表是否影响多行（0否，1是）
            * dbCollection.update()
            */
            @Test
            public void testUpdate(){
               DBObject   queryObject=new BasicDBObject();
               queryObject.put("name","suns");
               DBObject  setCondition=new BasicDBObject();
               setCondition.put("password","23564");
 
               DBObject   setObject=new BasicDBObject();
               setObject.put("$set",setCondition);
                //调用对象的方法，执行修改
               dbCollection.update(queryObject,setObject,false,true);
            }
 
           /**
            *7、测试删除数据
 *db.users.remove({name:"suns"});
            * dbCollection.remove();
            */
            @Test
            public void testDelete(){
               //准备封装参数
               DBObject   removeCondition=new BasicDBObject();
               removeCondition.put("name","suns");
               //调用对象方法，删除数据
               dbCollection.remove(removeCondition);
            }
}