Room 查询返回的列没有字段
Room The columns returned by the query does not have the fields
我在 'Order' 中保留了一份产品清单。
当我尝试从 Room 获取产品列表时。我收到以下错误。但是我做了一个TypeConvertor。可能是什么错误？
订单
@Entity(tableName = Order.TABLE_NAME)
@JsonClass(generateAdapter = true)
data class Order(
@PrimaryKey(autoGenerate = true)
val id: Long,
val isSendCheque: Int,
val phone: String,
val name: String,
val comment: String? = "",
val timeFrom: String,
val timeTo: String,
@TypeConverters(Converters::class)
@ColumnInfo(name = "listProduct")
var listProduct: List<Product>? = null,
val publicOrderId: String
) {
companion object {
const val TABLE_NAME = "mau_order"
}
}
产品
@Parcelize
@JsonClass(generateAdapter = true)
data class Product(
@SerializedName("id")
@PrimaryKey
var id: Long = -1,
@SerializedName("order_id") var orderId: Long = -1,
@SerializedName("name") var name: String = "name product",
@SerializedName("packaging") var packaging: String? = "1 кг",
@SerializedName("path_image") var pathImage: String = "",
@SerializedName("price") var price: Double = 0.0,
@SerializedName("price_discount") var priceDiscount: Double = 0.0,
@SerializedName("product_id") var productId: Int = -1,
@SerializedName("quantity") var quantity: Double = 0.0,
@SerializedName("units") var units: String = "ШТ",
@SerializedName("created_at") var createdAt: String = "",
@SerializedName("updated_at") var updatedAt: String = "",
@SerializedName("brgew") var brgew: String = "",
@SerializedName("gewei") var gewei: String = "кг"
) : Parcelable
OrdersDao
@Dao
interface OrdersDao {
/**
* Inserts [orders] into the [Order.TABLE_NAME] table.
* Duplicate values are replaced in the table.
* @param orders Orders
*/
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun insertOrders(orders: List<Order>)
/**
* Inserts [orders] into the [Order.TABLE_NAME] table.
* Duplicate values are replaced in the table.
* @param orders Orders
*/
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun insertOrders(order: Order)
/**
* Deletes all the orders from the [Order.TABLE_NAME] table.
*/
@Query("DELETE FROM ${Order.TABLE_NAME}")
suspend fun deleteAllOrders()
/**
* Fetches the order from the [Order.TABLE_NAME] table whose id is [orderId].
* @param orderId Unique ID of [Order]
* @return [Flow] of [Order] from database table.
*/
@Query("SELECT * FROM ${Order.TABLE_NAME} WHERE ID = :orderId")
fun getOrderById(orderId: Long): LiveData<Order>
//ERROR
@Query("SELECT listProduct FROM ${Order.TABLE_NAME} WHERE ID = :orderId")
fun getBasketById(orderId: Long): LiveData<Order>
/**
* Fetches all the orders from the [Order.TABLE_NAME] table.
* @return [Flow]
*/
@Query("SELECT * FROM ${Order.TABLE_NAME}")
fun getAllOrders(): LiveData<List<Order>>
}
转换器
@TypeConverter
fun stringToProductList(data: String?): MutableList<Product> {
if (data == null) {
return Collections.emptyList()
}
val listType = object : TypeToken<MutableList<Product>>() {
}.type
return gson.fromJson(data, listType)
}
@TypeConverter
fun ProductListToString(someObjects: MutableList<Product>?): String? {
if (someObjects == null) {
return null
}
return gson.toJson(someObjects)
}
错误
OrdersDao.java:53: error: The columns returned by the query does not
have the fields
[id,orderId,name,pathImage,price,priceDiscount,productId,quantity,units,createdAt,updatedAt,brgew,gewei]
in com.vepe.navigation.model.entity.Product even though they are
annotated as non-null or primitive. Columns returned by the query:
[listProduct]
public abstract java.util.List<com.vepe.navigation.model.entity.Product>
getBasketHistoryFromOrderById(long orderId); Current JDK version
1.8.0_272-b10 has a bug (https://bugs.openjdk.java.net/browse/JDK-8007720) that prevents Room
from being incremental. Consider using JDK 11+ or the embedded JDK
shipped with Android Studio
3.5+.C:\Users\mind\StudioProjects\Sarah_navigationProject\ProjectAndroid\app\build\tmp\kapt3\stubs\debug\com\vepe\navigation\model\entity\Product.java:8:
error: Entity class must be annotated with @Entity
请帮助我！谢谢
更新
我试图把@Entity 注释
我不知道在我的情况下是否有必要
并得到以下错误
error: The columns returned by the query does not have the fields
[id,orderId,name,pathImage,price,priceDiscount,productId,quantity,units,createdAt,updatedAt,brgew,gewei]
in com.vepe.navigation.model.entity.Product even though they are
annotated as non-null or primitive. Columns returned by the query:
[listProduct]
public abstract kotlinx.coroutines.flow.Flow<java.util.List<com.vepe.navigation.model.entity.Product>>
getBasketHistoryFromOrderById(long orderId); Current JDK version
1.8.0_272-b10 has a bug (https://bugs.openjdk.java.net/browse/JDK-8007720) that prevents Room
from being incremental. Consider using JDK 11+ or the embedded JDK
shipped with Android Studio
3.5+.C:\Users\mind\StudioProjects\Sarah_navigationProject\ProjectAndroid\app\build\tmp\kapt3\stubs\debug\com\vepe\navigation\data\local\dao\OrdersDao.java:53:
warning: The query returns some columns [listProduct] which are not
used by com.vepe.navigation.model.entity.Product. You can use
@ColumnInfo annotation on the fields to specify the mapping.
com.vepe.navigation.model.entity.Product has some fields [id, orderId,
name, packaging, pathImage, price, priceDiscount, productId, quantity,
units, createdAt, updatedAt, brgew, gewei] which are not returned by
the query. If they are not supposed to be read from the result, you
can mark them with @Ignore annotation. You can suppress this warning
by annotating the method with
@SuppressWarnings(RoomWarnings.CURSOR_MISMATCH). Columns returned by
the query: listProduct. Fields in
com.vepe.navigation.model.entity.Product: id, orderId, name,
packaging, pathImage, price, priceDiscount, productId, quantity,
units, createdAt, updatedAt, brgew, gewei.
您需要修复此查询：
@Query("SELECT listProduct FROM ${Order.TABLE_NAME} WHERE ID = :orderId")
fun getBasketById(orderId: Long): LiveData<Order>
问题是 selected 字段 (listProduct) 和返回类型 (Order) 不匹配。 Room 抱怨它无法理解如何构建只有一个字段的 Order 实例 - listProduct.
最简单的修复方法是 select 创建 Order 实例所需的所有字段：
@Query("SELECT * FROM ${Order.TABLE_NAME} WHERE ID = :orderId")
fun getBasketById(orderId: Long): LiveData<Order>
很简单，有时有很多查询和数据类我们错过了我们需要的和我们写的在代码中.
//ERROR
@Query("SELECT listProduct FROM ${Order.TABLE_NAME} WHERE ID = :orderId")
fun getBasketById(orderId: Long): LiveData<Order>
您在上述查询中 returning Order LiveData，但要求的 listProduct 不正确，要么
Make it '*'(获取orders/single订单列表)
@Query("SELECT * FROM ${Order.TABLE_NAME} WHERE ID = :orderId") fun getBasketById(orderId: Long): LiveData<Order>
或将return值改为LiveData>
@Query("SELECT listProduct FROM ${Order.TABLE_NAME} WHERE ID = :orderId") fun getBasketById(orderId: Long): LiveData<List<Product>>
这将解决您的问题。
除此之外，我还添加了房间转换，
object RoomConverters {
@TypeConverter
@JvmStatic
fun restoreModelList(listOfString: String): List<RoomModelList> {
return Gson().fromJson(listOfString, object : TypeToken<List<RoomModelList>>() {
}.type)
}
@TypeConverter
@JvmStatic
fun saveModelListAsString(listOfString: List<RoomModel>): String {
return Gson().toJson(listOfString)
}
}
我想出了这个办法来解决问题
订单服务
@GET("orders/baskethistory/id/{id}")
suspend fun getBasketHistoryById(@Path("id") id: Long): Response<BasketHistory>
对象列表的数据class
data class BasketHistory(
@SerializedName("basketHistory") val listProduct : MutableList<Product>
)
道
@Query("SELECT id,listProduct FROM ${Order.TABLE_NAME} WHERE ID = :orderId")
fun getBasketById(orderId: Long): LiveData<BasketHistory>
试一试
我在 'Order' 中保留了一份产品清单。 当我尝试从 Room 获取产品列表时。我收到以下错误。但是我做了一个TypeConvertor。可能是什么错误？
订单
@Entity(tableName = Order.TABLE_NAME)
@JsonClass(generateAdapter = true)
data class Order(
@PrimaryKey(autoGenerate = true)
val id: Long,
val isSendCheque: Int,
val phone: String,
val name: String,
val comment: String? = "",
val timeFrom: String,
val timeTo: String,
@TypeConverters(Converters::class)
@ColumnInfo(name = "listProduct")
var listProduct: List<Product>? = null,
val publicOrderId: String
) {
companion object {
const val TABLE_NAME = "mau_order"
}
}
产品
@Parcelize
@JsonClass(generateAdapter = true)
data class Product(
@SerializedName("id")
@PrimaryKey
var id: Long = -1,
@SerializedName("order_id") var orderId: Long = -1,
@SerializedName("name") var name: String = "name product",
@SerializedName("packaging") var packaging: String? = "1 кг",
@SerializedName("path_image") var pathImage: String = "",
@SerializedName("price") var price: Double = 0.0,
@SerializedName("price_discount") var priceDiscount: Double = 0.0,
@SerializedName("product_id") var productId: Int = -1,
@SerializedName("quantity") var quantity: Double = 0.0,
@SerializedName("units") var units: String = "ШТ",
@SerializedName("created_at") var createdAt: String = "",
@SerializedName("updated_at") var updatedAt: String = "",
@SerializedName("brgew") var brgew: String = "",
@SerializedName("gewei") var gewei: String = "кг"
) : Parcelable
OrdersDao
@Dao
interface OrdersDao {
/**
* Inserts [orders] into the [Order.TABLE_NAME] table.
* Duplicate values are replaced in the table.
* @param orders Orders
*/
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun insertOrders(orders: List<Order>)
/**
* Inserts [orders] into the [Order.TABLE_NAME] table.
* Duplicate values are replaced in the table.
* @param orders Orders
*/
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun insertOrders(order: Order)
/**
* Deletes all the orders from the [Order.TABLE_NAME] table.
*/
@Query("DELETE FROM ${Order.TABLE_NAME}")
suspend fun deleteAllOrders()
/**
* Fetches the order from the [Order.TABLE_NAME] table whose id is [orderId].
* @param orderId Unique ID of [Order]
* @return [Flow] of [Order] from database table.
*/
@Query("SELECT * FROM ${Order.TABLE_NAME} WHERE ID = :orderId")
fun getOrderById(orderId: Long): LiveData<Order>
//ERROR
@Query("SELECT listProduct FROM ${Order.TABLE_NAME} WHERE ID = :orderId")
fun getBasketById(orderId: Long): LiveData<Order>
/**
* Fetches all the orders from the [Order.TABLE_NAME] table.
* @return [Flow]
*/
@Query("SELECT * FROM ${Order.TABLE_NAME}")
fun getAllOrders(): LiveData<List<Order>>
}
转换器
@TypeConverter
fun stringToProductList(data: String?): MutableList<Product> {
if (data == null) {
return Collections.emptyList()
}
val listType = object : TypeToken<MutableList<Product>>() {
}.type
return gson.fromJson(data, listType)
}
@TypeConverter
fun ProductListToString(someObjects: MutableList<Product>?): String? {
if (someObjects == null) {
return null
}
return gson.toJson(someObjects)
}
错误
OrdersDao.java:53: error: The columns returned by the query does not have the fields [id,orderId,name,pathImage,price,priceDiscount,productId,quantity,units,createdAt,updatedAt,brgew,gewei] in com.vepe.navigation.model.entity.Product even though they are annotated as non-null or primitive. Columns returned by the query: [listProduct] public abstract java.util.List<com.vepe.navigation.model.entity.Product> getBasketHistoryFromOrderById(long orderId); Current JDK version 1.8.0_272-b10 has a bug (https://bugs.openjdk.java.net/browse/JDK-8007720) that prevents Room from being incremental. Consider using JDK 11+ or the embedded JDK shipped with Android Studio 3.5+.C:\Users\mind\StudioProjects\Sarah_navigationProject\ProjectAndroid\app\build\tmp\kapt3\stubs\debug\com\vepe\navigation\model\entity\Product.java:8: error: Entity class must be annotated with @Entity
请帮助我！谢谢
更新 我试图把@Entity 注释 我不知道在我的情况下是否有必要 并得到以下错误
error: The columns returned by the query does not have the fields [id,orderId,name,pathImage,price,priceDiscount,productId,quantity,units,createdAt,updatedAt,brgew,gewei] in com.vepe.navigation.model.entity.Product even though they are annotated as non-null or primitive. Columns returned by the query: [listProduct] public abstract kotlinx.coroutines.flow.Flow<java.util.List<com.vepe.navigation.model.entity.Product>> getBasketHistoryFromOrderById(long orderId); Current JDK version 1.8.0_272-b10 has a bug (https://bugs.openjdk.java.net/browse/JDK-8007720) that prevents Room from being incremental. Consider using JDK 11+ or the embedded JDK shipped with Android Studio 3.5+.C:\Users\mind\StudioProjects\Sarah_navigationProject\ProjectAndroid\app\build\tmp\kapt3\stubs\debug\com\vepe\navigation\data\local\dao\OrdersDao.java:53: warning: The query returns some columns [listProduct] which are not used by com.vepe.navigation.model.entity.Product. You can use @ColumnInfo annotation on the fields to specify the mapping. com.vepe.navigation.model.entity.Product has some fields [id, orderId, name, packaging, pathImage, price, priceDiscount, productId, quantity, units, createdAt, updatedAt, brgew, gewei] which are not returned by the query. If they are not supposed to be read from the result, you can mark them with @Ignore annotation. You can suppress this warning by annotating the method with @SuppressWarnings(RoomWarnings.CURSOR_MISMATCH). Columns returned by the query: listProduct. Fields in com.vepe.navigation.model.entity.Product: id, orderId, name, packaging, pathImage, price, priceDiscount, productId, quantity, units, createdAt, updatedAt, brgew, gewei.
您需要修复此查询：
@Query("SELECT listProduct FROM ${Order.TABLE_NAME} WHERE ID = :orderId")
fun getBasketById(orderId: Long): LiveData<Order>
问题是 selected 字段 (listProduct) 和返回类型 (Order) 不匹配。 Room 抱怨它无法理解如何构建只有一个字段的 Order 实例 - listProduct.
最简单的修复方法是 select 创建 Order 实例所需的所有字段：
@Query("SELECT * FROM ${Order.TABLE_NAME} WHERE ID = :orderId")
fun getBasketById(orderId: Long): LiveData<Order>
很简单，有时有很多查询和数据类我们错过了我们需要的和我们写的在代码中.
//ERROR
@Query("SELECT listProduct FROM ${Order.TABLE_NAME} WHERE ID = :orderId")
fun getBasketById(orderId: Long): LiveData<Order>
您在上述查询中 returning Order LiveData，但要求的 listProduct 不正确，要么
Make it '*'(获取orders/single订单列表)
@Query("SELECT * FROM ${Order.TABLE_NAME} WHERE ID = :orderId") fun getBasketById(orderId: Long): LiveData<Order>或将return值改为LiveData
@Query("SELECT listProduct FROM ${Order.TABLE_NAME} WHERE ID = :orderId") fun getBasketById(orderId: Long): LiveData<List<Product>>
这将解决您的问题。
除此之外，我还添加了房间转换，
object RoomConverters {
@TypeConverter
@JvmStatic
fun restoreModelList(listOfString: String): List<RoomModelList> {
return Gson().fromJson(listOfString, object : TypeToken<List<RoomModelList>>() {
}.type)
}
@TypeConverter
@JvmStatic
fun saveModelListAsString(listOfString: List<RoomModel>): String {
return Gson().toJson(listOfString)
}
}
我想出了这个办法来解决问题
订单服务
@GET("orders/baskethistory/id/{id}")
suspend fun getBasketHistoryById(@Path("id") id: Long): Response<BasketHistory>
对象列表的数据class
data class BasketHistory(
@SerializedName("basketHistory") val listProduct : MutableList<Product>
)
道
@Query("SELECT id,listProduct FROM ${Order.TABLE_NAME} WHERE ID = :orderId")
fun getBasketById(orderId: Long): LiveData<BasketHistory>
试一试