/// <summary>
/// determine whether data is exist
/// </summary>
/// <param name="cmd">command</param>
/// <returns>whether data is exist</returns>
public static async Task <bool> QueryAsync(ICommand cmd)
{
if (cmd?.IsObsolete ?? true)
{
return(false);
}
return(await CommandExecuteManager.QueryAsync(cmd).ConfigureAwait(false));
}
/// <summary>
/// query
/// </summary>
/// <typeparam name="T">data type</typeparam>
/// <param name="cmd">query command</param>
/// <returns>datas</returns>
public static async Task <IEnumerable <T> > QueryAsync <T>(ICommand cmd)
{
if (cmd?.IsObsolete ?? true)
{
return(new List <T>(0));
}
return(await CommandExecuteManager.QueryAsync <T>(cmd).ConfigureAwait(false));
}