【MongoDB数据库】JavaMongoDBCRUDExample - 数据库编程

加数据到BasicDBObject）

	public void testSave3(){
		DBCollection table = db.getCollection("person");
		
		Map maps = new HashMap();
		maps.put("name", "小李");
		maps.put("password", "xiaozhang");
		maps.put("age", 24);
		
		BasicDBObject document = new BasicDBObject(maps);//这样添加后，对象里的字段是无序的。
		table.insert(document);
	}

在mongodb shell中使用命令查看数据

> db.person.find()
{ "_id" : ObjectId("537761da2c82bf816b34e6cf"), "name" : "jack", "age" : 50 }
{ "_id" : ObjectId("53777096d67d552056ab8916"), "name" : "小王", "age" : 24 }
{ "_id" : ObjectId("5377712cd67d84f62c65c4f6"), "name" : "小郭", "age" : 24 }
{ "_id" : ObjectId("53777230d67dfe576de5079a"), "name" : "小张", "password" : "xiaozhang", "age" : "23" }
{ "_id" : ObjectId("537772e9d67df098a26d79a6"), "age" : 24, "name" : "小李", "password" : "xiaozhang" }

9、更新对象

我们可以结合【mongodb shell命令】db.person.update({name:"小李"},{$set:{password:"hello"}})来理解Java是如何操作对象来更新的。{name:"小李"}是一个BasicDBObject，{$set:{password:"hello"}也是一个BasicDBObject，这样理解的话，你就会觉得mongodb shell命令操作和Java操作很相似。

	public void testUpdate() {
		DBCollection table = db.getCollection("person");
		BasicDBObject query = new BasicDBObject();
		query.put("name", "小张");

		BasicDBObject newDocument = new BasicDBObject();
		newDocument.put("age", 23);

		BasicDBObject updateObj = new BasicDBObject();
		updateObj.put("$set", newDocument);
		table.update(query, updateObj);
	}

	// 命令操作：db.person.update({name:"小李"},{$set:{password:"hello"}})
	public void testUpdate2() {
		DBCollection table = db.getCollection("person");
		BasicDBObject query = new BasicDBObject("name", "小张");
		BasicDBObject newDocument = new BasicDBObject("age", 24);
		BasicDBObject updateObj = new BasicDBObject("$set", newDocument);
		table.update(query, updateObj);
	}

10、删除对象

可参考db.users.remove({name:"小李"})命令来理解Java操作对象

	public void testDelete(){
		DBCollection table = db.getCollection("person");
		BasicDBObject query = new BasicDBObject("name", "小李");
		table.remove(query);
	}

11、参考

Java + MongoDB Hello World Example（推荐）

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