问题描述
我是解析服务器(parse.com)上的新手.我有两个类"students_records"和"students_fee".我将费用记录存储在"students_fee"类中，在"student_id"列中具有"students_records"的objectId.现在，我想通过一个查询来收集两个类的记录，这类似于我们在mysql中基于"students_fee"类中的"fee_year"列进行的联接查询.例如，获取所有具有"fee_year" = 2016和"student_id" ="students_records"的objectId的学生，这是链接 https://parseplatform.github.io/docs/js/guide/我目前正在获得帮助，但是我找不到这样的东西.谁能告诉我该怎么做?
I am new on parse server ( parse.com ). I have two classes "students_records" and "students_fee". I am storing fee records in class "students_fee" with objectId of "students_records" in column "student_id". Now I want to collect records from both classes by one query similar to join query we do in mysql with base on column 'fee_year' in class "students_fee". for example get all students who have 'fee_year'=2016 and 'student_id'=objectId of "students_records", this is link https://parseplatform.github.io/docs/js/guide/ of guide I am currently getting help, but i can't find such thing. Can anyone tell me how to do that?
谢谢.
推荐答案
由于在后台使用MongoDB(NoSQL)进行解析，因此没有真正的联接".您可以做的是创建一个从学生到记录的数组关系，然后在查询中使用 include 以便将所有记录包括在学生下.
Since parse use MongoDB (NoSQL) behind the scenes there is no real "join". What you can do is to create a array relationship from students to records and then use include in your query in order to include all the records under a student.
您可以在此处了解更多信息.
You can read more about it here.
为了简化操作，我建议您在此处使用Parse SDK.Parse SDK适用于所有流行的编程语言(例如iOS，Android，PHP，JavaScript等)
I recommend you to use Parse SDK's here in order to keep it simple.the Parse SDK is available for all the popular programming languages (e.g. iOS, Android, PHP, JavaScript and more)
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