Update

class Update
androidx.room.Update

Marks a method in a Dao annotated class as an update method.

The implementation of the method will update its parameters in the database if they already exists (checked by primary keys). If they don't already exists, this option will not change the database.

All of the parameters of the Update method must either be classes annotated with Entity or collections/array of it.

Summary

Public constructors
<init>(onConflict: Int)

Marks a method in a Dao annotated class as an update method.

Properties
Int

What to do if a conflict happens.

Public constructors

<init>

Update(onConflict: Int)

Marks a method in a Dao annotated class as an update method.

The implementation of the method will update its parameters in the database if they already exists (checked by primary keys). If they don't already exists, this option will not change the database.

All of the parameters of the Update method must either be classes annotated with Entity or collections/array of it.

See Also

Properties

onConflict

val onConflict: Int

What to do if a conflict happens.

Use OnConflictStrategy#ABORT (default) to roll back the transaction on conflict. Use OnConflictStrategy#REPLACE to replace the existing rows with the new rows. Use OnConflictStrategy#IGNORE to keep the existing rows.

Return
Int: How to handle conflicts. Defaults to OnConflictStrategy#ABORT.