如何使用 Casbah for MongoDb 对域模型进行 CRUD 操作?

发布于 2024-11-17 08:58:23 字数 1031 浏览 4 评论 0原文

有一个关于Casbah的教程:

http://api.mongodb.org/scala/ casbah/current/tutorial.html

但我发现很难遵循该教程,因为我仍在学习 Scala。

我只想了解如何使用 Casbah 进行简单的 CRUD 操作 在我可以更进一步之前。

给出下面的域模型:

class Hotel (var name: String, var stars: Int, val address:  Address)

class Address(var street:String, var city: String, var postCode: String)



val address = new Address(street = "1234 st", city = "edmond", postCode = "1232234", country = "USA" )


  val hotel = new Hotel(name = "Super Nice", stars = 4, address =  address)

val address2 = new Address(street = "main st", city = "edmond", postCode = "1232234", country = "USA" )

val hotel2 = new Hotel(name = "Big Hotel", stars = 4, address =  address2)

上面给出的 Casbah 代码是用来实现这些任务的?

(1) 将两家酒店保存在 mongodb 中

(2) 找到所有星级等于 4 或大于 4 的酒店。这应该给我 我可以迭代的列表

(3)找到一家名为“Super Nice”的酒店并将其名称更改为“Ultra Nice”

(4)获取所有酒店的地址并将国家/地区更改为小写并保存在数据库中

There is a tutorial on Casbah:

http://api.mongodb.org/scala/casbah/current/tutorial.html

But I find it hard to follow the tutorial as I am still learning Scala.

All I wanted to find out how to do simple CRUD operations using Casbah to begin with
before I can go more advanced.

Given below domain models:

class Hotel (var name: String, var stars: Int, val address:  Address)

class Address(var street:String, var city: String, var postCode: String)



val address = new Address(street = "1234 st", city = "edmond", postCode = "1232234", country = "USA" )


  val hotel = new Hotel(name = "Super Nice", stars = 4, address =  address)

val address2 = new Address(street = "main st", city = "edmond", postCode = "1232234", country = "USA" )

val hotel2 = new Hotel(name = "Big Hotel", stars = 4, address =  address2)

Given above what Casbah code is to achieve these tasks?

(1) save both hotels in mongodb

(2) find all hotels that have stars equal to 4 or greater than 4. this should give me
a list over which I can iterate

(3) find a hotel by the name "Super Nice" and change its name to "Ultra Nice"

(4) get addresses of all hotels and change country to lower case and save in database

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孤单情人 2024-11-24 08:58:23

在这里您可以看到如何插入数据: Casbah wiki

如果你想直接在 MongoDB 中保存案例类(不需要 MongoDBObject),你应该看看 Salat 和 SalatDao:Salat 演示

在我看来,问题(2)-(4)的答案可以在 casbah 和 salat 的文档中轻松找到。

Here you can see how to insert data: Casbah wiki

If you want to directly save case classes (without needing a MongoDBObject) in MongoDB you should have a look at Salat and SalatDao: Salat presentation

In my opinion, the answers to question (2) - (4) can be found easily in the documentation of casbah and salat.

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