如何将整数文字放入Room查询中？

Question

Is it possible to put integer literals into Room query? Following query leads to build error:

@Query("UPDATE topics SET unreadCount=0 WHERE id=:chatId")
fun resetUnreadCount(chatId: Long)

I have tried several options (including RawQuery ) and came to an option of passing Int argument with default value:

@Query("UPDATE chats SET unreadCount=:ZERO WHERE id=:chatId")
fun resetUnreadCount(chatId: Long, ZERO: Int = 0) // hacky way to pass int literal into the query

Is there a normal way to do that?

Answer 1

Please check this documentation.

https://www.sqlite.org/datatype3.html . Look in section 3.4, it talks about coumn affinity behviour

unreadCount='0'

This should also work

@Query("UPDATE topics SET unreadCount='0' WHERE id=:chatId")

Answer 2

First query has a different Entity class 'topics'

@Query("UPDATE topics SET unreadCount=0 WHERE id=:chatId")

Should it be chats too? as the below query is working. integer in the query is fine.

@Query("UPDATE chats SET unreadCount=:ZERO WHERE id=:chatId")