/// <summary>
/// determine whether data is exist
/// </summary>
/// <param name="cmd">command</param>
/// <returns>whether data is exist</returns>
public static bool Query(ICommand cmd)
{
return(CommandExecuteManager.Query(cmd));
}
/// <summary>
/// quer
/// </summary>
/// <typeparam name="T">data type</typeparam>
/// <param name="cmd">query command</param>
/// <returns>datas</returns>
public static IEnumerable <T> Query <T>(ICommand cmd)
{
return(CommandExecuteManager.Query <T>(cmd));
}