modify-room-database

name	Modify Room Database
description	Instructions for modifying the Room caching database in MemosM.

Modify Room Database

MemosM uses Android Room for local caching.

1. Add/Modify Entity

Entities are located in app/src/main/java/org/example/memosm/data/cache/. Define your data class and annotate it with @Entity.

@Entity(tableName = "my_custom_table")
data class CachedData(
    @PrimaryKey val id: String,
    val content: String
)

2. Update DAO

Add query methods to app/src/main/java/org/example/memosm/data/cache/MemoDao.kt (or create a new DAO).

@Dao
interface MemoDao {
    @Insert(onConflict = OnConflictStrategy.REPLACE)
    suspend fun insertData(data: CachedData)
}

Note: If you create a new DAO, expose it in MemoCacheDatabase.kt and provide it in Koin (Modules.kt).

3. Database Migration

If you changed an existing entity or added a new one, you must increment the version in MemoCacheDatabase.kt.

@Database(
    entities = [CachedMemo::class, CachedData::class], 
    version = 2, // <-- Increment this
    exportSchema = false
)
abstract class MemoCacheDatabase : RoomDatabase() { ... }

In a production app, you should also provide a Migration block, but depending on the user requirements, a simple destructive migration (fallbackToDestructiveMigration()) might be used if it's just a pure cache. Check existing logic in MemoCacheDatabase.kt to follow the project's strategy.