如何使用单个查询更新所有行中的列 - Android Room Database

Question

I am trying to update a column in Room database android which is associated with all rows.

My condition is i have a column called isActive which is a boolean column if a row contains true value for this column all other row should have false

This is what i have tried but it clearly updates a single row

@Query("UPDATE ADDRESS SET isActive = (CASE WHEN isActive = 0 THEN 1 ELSE 0 END) WHERE addressId = :addressId")

Only the row I'm pointing to with primary key is getting updated i want all rows expect that row to update

Even if the column is already true it should be changed to false

How do I solve this?

Answer 1

I have found a solution to the problem

This is what i have tried to replace the query with

note: we don't need 2 queries to achieve this

Answer:

@Query("UPDATE ADDRESS SET isActive = CASE addressId WHEN :addressId THEN 1 ELSE 0 END")

by including addressId in CASE have solved my problem.

Hope this might help someone!

Answer 2

如果要更新所有行，则必须删除 where 条件。