Kotlin 如何判断数据是否插入到房间数据库中

我正在使用项目中新架构组件的房间数据库.

adding to database, I checked with debugger, this statement executed successfully.

appContext.db.rallyDAO().addVehicleListItem(vehicle)

在INSERT之后从此语句的数据库中获取NULL.

val v = appContext.db.rallyDAO().getVehicleListItem(it.vehicleID)

RoomDatabase

@Database(entities = arrayOf(Rally::class, Route::class, CheckPoints::class, Vehicles::class, VehicleListItem::class), version = 1)
abstract class TSDRoom: RoomDatabase() {
    public abstract fun rallyDAO():RallyDAO
}

内部DAO

@Insert(onConflict = OnConflictStrategy.REPLACE)
    fun addVehicleListItem(vehicleListItem:VehicleListItem)

    @Query("select * from vehicles_submitted where vehicle_id LIKE :vehicleID")
    fun getVehicleListItem(vehicleID:String):VehicleListItem

VehicleListItem Entity

@Entity(tableName = "vehicles_submitted",
        foreignKeys = arrayOf(ForeignKey(entity = Rally::class,
                parentColumns = arrayOf("rally_id"),
                childColumns = arrayOf("rally_id"))))
class VehicleListItem {
    @PrimaryKey
    @ColumnInfo(name = "vehicle_id")
    @SerializedName("vehicle_id")
    var vehicleID : String = ""
    @ColumnInfo(name = "driver_id")
    @SerializedName("driver_id")
    var driverID : String = ""
    @ColumnInfo(name = "vehicle_name")
    @SerializedName("vehicle_name")
    var vehicleName : String = ""
    @ColumnInfo(name = "driver_name")
    @SerializedName("driver_name")
    var driverName : String = ""
    @ColumnInfo(name = "driver_email")
    @SerializedName("driver_email")
    var driverEmail : String = ""

    @ColumnInfo(name = "rally_id")
    @SerializedName("rally_id")
    var rallyID: String = ""

    @ColumnInfo(name = "is_passed")
    @SerializedName("is_passed")
    var isPassed = false

    @ColumnInfo(name = "passing_time")
    @SerializedName("passing_time")
    var passingTime:String=""
}