I am using Android Architecture Components. Hence using Room 'ORM'. I have a class EQPreset that has a member String presetName. This class has a child class called UserDefinedEQPreset and it contains an int[] arr. I have declared the child class EQPreset and entity using @Entity annotation, since only this subtype I want to store in db. Now I want to use parent class's (EQPreset) member String presetName to be used as primary key. How to declare a member of parent class as primary key while using Room. I know @Primarykey annotation is used to declare the primary key. But how to use parent class's member as primary key.
Primary key from parent class using Room?
Viewed 2272
2 Answers
@Entity(primaryKeys = ["presetName"])
class UserDefinedEQPreset extends EQPreset{
...
}
I think this is what you're looking for. Use the primaryKeys attribute on the Entity annotation to specify the primary key. You can also use this to specify composite primary keys.
Related