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How to Handle Concurrent Room Database Inserts with Kotlin Coroutines in Android?

πŸ‘€ Views: 32 πŸ’¬ Answers: 1 πŸ“… Created: 2025-06-15
android kotlin room

Quick question that's been bugging me - I've been researching this but I'm updating my dependencies and Quick question that's been bugging me - I'm working with an scenario while trying to insert multiple entries into a Room database concurrently using Kotlin Coroutines. After implementing the inserts, I'm noticing that only one of the entries seems to be saved, while the others are either ignored or cause a `SQLiteConstraintException`. I'm using Room version 2.4.2 and Kotlin Coroutines version 1.5.2. Here’s a simplified version of my DAO: ```kotlin @Dao interface UserDao { @Insert(onConflict = OnConflictStrategy.REPLACE) suspend fun insertUser(user: User) } ``` And this is how I'm trying to insert the users: ```kotlin class UserRepository(private val userDao: UserDao) { suspend fun insertUsers(users: List<User>) { users.forEach { user -> CoroutineScope(Dispatchers.IO).launch { userDao.insertUser(user) } } } } ``` I’m aware that using `CoroutineScope(Dispatchers.IO).launch` inside a loop can lead to issues, but I needed the inserts to occur in a non-blocking way. I tried using `async` but ended up with the same `SQLiteConstraintException` for some entries. Additionally, when I run this code, only the last user in the list appears to be stored in the database. Is there a more efficient way to handle multiple inserts concurrently without this constraint exception? Any suggestions on best practices for inserting multiple records in Room with Kotlin Coroutines would be greatly appreciated! For context: I'm using Kotlin on Windows. Any ideas what could be causing this? Thanks for your help in advance! I've been using Kotlin for about a year now. Thanks for your help in advance! Any pointers in the right direction?