/// <summary>
/// 增、删、改异步操作
/// </summary>
/// <param name="connection">链接字符串</param>
/// <param name="cmd">sql语句</param>
/// <param name="param">参数</param>
/// <param name="flag">true存储过程，false sql语句</param>
/// <returns>int</returns>
public Task <int> ExcuteNonQueryAsync(string connection, string cmd, DynamicParameters param, bool flag = false)
{
return(_sqlhelper.ExcuteNonQueryAsync(connection, cmd, param, flag));
}