Android Room插入所有问题

Question

我开始使用Android Room,我遇到了一些麻烦.

我有一个7 Orders的ArrayList,当我调用insertAll(List orders)时,只有4个订单被插入到数据库中.

如何调试插入查询以查找阻塞内容？

谢谢

Answer 1

Room执行的调用不是同步的,因此可能在您执行时

List<Order> myOrders = mDb.getOrderDao().getAll()

它仍在插入订单.

试试这个

@Dao 
public interface OrderDao { 
    @Insert(onConflict = OnConflictStrategy.REPLACE) 
    public long insertOrder(Order order); 

    @Insert(onConflict = OnConflictStrategy.REPLACE) 
    void insertAllOrders(List<Order> order); 

    @Query("SELECT * FROM orders") 
    List<Order> getAll(); 
 }

@Entity(tableName = TABLE_NAME) 
public class Order { 
   public static final String TABLE_NAME = "orders"; 
   @PrimaryKey (autoGenerate = true)
   private int id; 
   @SerializedName("order_number") 
   @ColumnInfo(name = "order_number") 
   private String orderNumber; 
} 

// Call 
mDb.getOrderDao().insertAllOrders(orders);
Log.d(TAG, "inserted all");

Executor executor = Executors.newSingleThreadExecutor();

executor.execute(new Runnable() {
        @Override
        public void run() {

             List<Order> myOrders = mDb.getOrderDao().getAll();
             Log.d(TAG, "Orders nr = " + myOrders.size()); 
        }
});

Answer 2

必须添加 OnConflict 属性。

@Insert(onConflict = OnConflictStrategy.REPLACE)