sqliteAsyncConnection选择计数始终返回1

Question

我无法弄清楚为什么计数查询总是返回1，我确信表中有多行，因为我已经将它们打印出来了。

SQLiteAsyncConnection dbConnection;// this is set 

dbConnection.CreateTableAsync<PickingData>();// create the table

int LastInsertedId = await dbConnection.ExecuteScalarAsync<int>("select count(*) from " + "PickingData");

在拣货数据类中

[PrimaryKey, AutoIncrement, Column("_id")]
public int Id { get; set; }