添加新 table 和更新版本号后 Room 数据库挂起

Question

一旦我的应用程序执行第一个房间命令（在不同的 table 中），应用程序就会冻结。

我从控制台收到的最后一条消息是：

I/SQLiteOpenHelper: DB version upgrading from 3 to 4

我认为我使用迁移命令正确升级了数据库。我还看到一个文件 4.json，其中包含新创建的实体。

MainDatabase.kt

@Database(
    entities = [
        PaymentEntity::class,
        PaymentOptionsEntity::class,
    exportSchema = true,
    version = 4
)
abstract class MainDatabase : RoomDatabase() {
abstract fun paymentDao(): PaymentDao

    companion object {
        @Volatile
        private var INSTANCE: MainDatabase? = null

        val MIGRATION_3_4 = object : Migration(3, 4){
            override fun migrate(database: SupportSQLiteDatabase) {
                database.execSQL("CREATE TABLE IF NOT EXISTS `PaymentOptionsEntity` (`id` INTEGER, PRIMARY KEY(`id`))")
            }
        }

        fun getDatabase(
            context: Context,
            scope: CoroutineScope? = null
        ): MainDatabase {
            // if the INSTANCE is not null, then return it,
            // if it is, then create the database
            return INSTANCE ?: synchronized(this) {
                val instance = Room.databaseBuilder(
                    context.applicationContext,
                    MainDatabase::class.java,
                    BuildConfig.APPLICATION_ID + "_" + BuildConfig.FLAVOR + "_db"
                )
                    .addMigrations(MIGRATION_1_2, MIGRATION_2_3, MIGRATION_3_4)
                    .build()
                INSTANCE = instance
                // return instance
                instance
            }
        }    
    }
}

PaymentDao

@Dao
interface PaymentDao {
    @Insert(onConflict = OnConflictStrategy.REPLACE)
    suspend fun insertPaymentOptions(paymentOptions: List<PaymentOptionsEntity>)

    @Query("SELECT * FROM PaymentOptionsEntity")
    suspend fun getPaymentOptions(): List<PaymentOptionsEntity>
}

PaymentOptionsEntity

@Parcelize
@Entity(tableName="PaymentOptionsEntity")
data class PaymentOptionsEntity (
    @PrimaryKey
    val id: String = ""
): Parcelable

build.gradle（应用）：

implementation "androidx.room:room-runtime:2.4.0-alpha03"
implementation "androidx.room:room-ktx:2.4.0-alpha03"

Answer 1

您已在 PaymentOptionsEntity 中将 id 定义为字符串

并在 MIGRATION_3_4 中作为整数 ("CREATE TABLE IF NOT EXISTS PaymentOptionsEntity (id INTEGER, PRIMARY KEY(id))")

两处保持一致

添加新 table 和更新版本号后 Room 数据库挂起

Room database hangs after adding new table and updating version number

android

android-room