Store multiple rows in a single key.

[Spmadhu Priya]

Hi!

I am doing internship in a company.

I am beginner to java.

I am developing the timetable project.

I want to store the below form when i am submitting the form .I know that i can store the single row at a time but i want to store multiple store at a time using JDO.

Thanks  in advance.

My form design is 

Day	1	2	3	4	5
Day 1	Value1	Value1	Value1	Value1	Value1
Day 2	Value2	Value2	Value2	Value2	Value2
Day 3	Value3	Value3	Value3	Value3	Value3
Day 4	Value4	Value4	Value4	Value4	Value4
Day 5	Value5	Value5	Value5	Value5	Value5
Day 6	Value6	Value6	Value6	Value6	Value6

[Patrice (Cloud Platform Support)]

Hi Spmadhu,

There are a couple of ways to do what you want. A single Datastore entity can have a repeated property. It can also have a structured property (a property made out of other properties).

So, a single entity could be "form" with a repeated Structured Property called "day". That structured property could then contain the values of columns 1 through 5, with a value for "day".

So your single "form 1" will have a property "Day", which will contain " 1, Value 1,Value 1,Value 1,Value 1,Value 1", then another "Day" in the same "form 1", containing "2, Value 2, Value 2, Value 2, Value 2, Value 2", etc.

In JDO specifically, repeated properties are "collections", and structured properties are "embedded". You can see more information here [1]

I would personally suggest using Objectify or JPA if you're not bound to JDO.

I hope these helps! 

Good luck with the internship :)

[1] https://cloud.google.com/appengine/docs/java/datastore/jdo/dataclasses

[spmadhupriya]

Hi Patrice,

Thank you so much.

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