在Xamarin C中选择异步原始查询到Sqlitie数据库的问题＃

Question

使用ExecuteAsync适用于创建，插入等，但不适用于选择。这是两个有效的查询：CREATE TABLE t(x INTEGER PRIMARY KEY ASC, y, z)和insert into t(y, z) values(2, 2)

但是选择没有。这是我的代码：

SQLiteAsyncConnection conn = new SQLiteAsyncConnection(App.Databaselocation);
var result = await conn.ExecuteAsync("select y from t");

并抛出此SQLiteException：

SQLite.SQLiteConnection.Execute（System.String查询，System。）中的SQLite.SQLiteException：在SQLite.SQLiteCommand.ExecuteNonQuery（）[0x000ad]中的行\ n，位于/Users/vagrant/git/src/SQLite.cs:2334 \ n中。 /Tesers/vagrant/git/src/SQLite.cs:673 \ n中的Object [] args）[0x0003a]位于/ Users / vagrant / git / src / SQLiteAsync中的SQLite.SQLiteAsyncConnection + <> c__DisplayClass21_0.b__0（）[0x00013] .cs：222 \ n在System.Threading.Tasks.Task

1[TResult].InnerInvoke () [0x0000f] in
  <f32579baafc1404fa37ba3ec1abdc0bd>:0 \n  at
  System.Threading.Tasks.Task.Execute () [0x00010] in
  <f32579baafc1404fa37ba3ec1abdc0bd>:0 \n--- End of stack trace from
  previous location where exception was thrown ---\n  at
  System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw ()
  [0x0000c] in <f32579baafc1404fa37ba3ec1abdc0bd>:0 \n  at
  System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess
  (System.Threading.Tasks.Task task) [0x0003e] in
  <f32579baafc1404fa37ba3ec1abdc0bd>:0 \n  at
  System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification
  (System.Threading.Tasks.Task task) [0x00028] in
  <f32579baafc1404fa37ba3ec1abdc0bd>:0 \n  at
  System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd
  (System.Threading.Tasks.Task task) [0x00008] in
  <f32579baafc1404fa37ba3ec1abdc0bd>:0 \n  at
  System.Runtime.CompilerServices.TaskAwaiter

1 [TResult] .GetResult（）[0x00000] in：0 \ n atou.PoblacionPage + d _1.MoveNext（）[0x00044] in C：\ Users \ sgmon \ OneDrive \ Projects \ Mars \ Pob.xaml.cs：41“

Answer 1

您需要使用Query / QueryAsync来从sql select返回结果集：

var result = await conn.QueryAsync<t>("select y from t");