/// <summary>
/// 增、删、改异步操作
///
///
/// </summary>
/// <typeparam name="T">实体</typeparam>
/// <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 async Task <int> ExcuteNonQueryAsync <T>(string cmd, DynamicParameters param = null, bool flag = false) where T : class, new()
{
int result = 0;
using (var con = new MySqlFactory().DataBaseConnection(_connectionStr))
{
result = await con.ExecuteAsync(cmd, param, null, null, flag?CommandType.StoredProcedure : CommandType.Text);
}
return(result);
}