我正在使用Mysql数据库（版本5.5）开发一个C＃应用程序。我正面临一个问题，我需要捕获Mysql中发生的异常。它是否被Mysql或dotNet捕获并不重要。问题是我想在发生异常/错误时回滚我以前的所有工作;是MySqlException还是自定义的。是的，我尝试使用TransactionScope和MySqlTransaction，但它没有回滚我的工作。
public int AddDeviceNew(string IMEI, string Sim, TextBox veh_reg, RadioButtonList veh_icon, RadioButtonList vehicle_type, DropDownList group, DropDownList ddlIsDimts, HiddenField hid_requested_id)
{
if (conn.State == ConnectionState.Closed)
{
conn.Open();
}
Common_Functions com_Obj = new Common_Functions();
int deviceid;
Int64 serviceid;
string logText;
long Sim_Id;
MySqlCommand command = conn.CreateCommand();
MySqlTransaction trans = conn.BeginTransaction();
//command.Connection = conn;
//command.CommandText = "SET autocommit = 0";
//command.ExecuteNonQuery();
command.CommandText = "select ffc_status from devices where imei='" + IMEI + "'";
string strdeviceFFCstatus = Convert.ToString(command.ExecuteScalar());
command.CommandText = "select ffc_status from mobile_simcards where mobile_no=" + Sim;
string strSIMFFCstatus = Convert.ToString(command.ExecuteScalar());
if (strSIMFFCstatus == "1")
{
command.CommandText = "delete from mobile_simcards where mobile_no=" + Sim;
command.ExecuteNonQuery();
}
command.CommandText = "insert into mobile_simcards(network,mobile_no,created,last_updated) values(2,'" + Sim + "',now(),now())";
command.ExecuteNonQuery();
long SimID = command.LastInsertedId;
if (strdeviceFFCstatus == "1")
{
command.CommandText = "delete from devices where imei='" + IMEI + "'";
command.ExecuteNonQuery();
}
logText = "--------------------------------------\nDate: " + DateTime.Now.ToString("G") + "\nNotes: \n**Created**\n--------------------------------------\n";
command.CommandText = "insert into devices (sys_user_id,sys_type,sys_simcard,imei,serial_no,fleet_key,heartbeat_type,odometer_offset,hours_offset,`log`,notes) values('3114','15','" + SimID + "','" + IMEI + "','" + IMEI + "','Shggg123',0,'54718','43200','" + logText + "','')";
command.ExecuteNonQuery();
//Sim_Id = command.LastInsertedId;
deviceid = Convert.ToInt16(command.LastInsertedId);
//----------For MiCar-------------
//if (group.SelectedItem.Text == "4551")
//{
// for (int i = 1; i <= 30; i++)
// {
// command.CommandText = "insert into devicemappingrfid values(" + i + "," + deviceid + ",'',0,1,now())";
// command.ExecuteNonQuery();
// }
//}
//--------------------------------
logText = "--------------------------------------\nDate: " + DateTime.Now.ToString("G") + "\nNotes: \n**Created**\n--------------------------------------\n";
command.CommandText = "insert into services(sys_user_id,sys_sage_reference,sys_created,sys_renewal_due,sys_renewal_cost,sys_device_id,veh_reg,veh_icon_1,veh_icon_2,veh_body,veh_chasis,veh_year,veh_seats,veh_avempg,veh_costpermile,veh_wd_auth_start,veh_wd_auth_end,veh_we_auth_start,veh_we_auth_end,veh_sun_auth_start,veh_sun_auth_end,veh_type,`log`,veh_type_name,is_dimts) values(3114,345,now(),'0001-01-01 00:00:00','0.0','" + deviceid + "','" + Regex.Replace(veh_reg.Text, "[^0-9a-zA-Z]+", "") + "','" + veh_icon.SelectedValue + "','','','','','0','0.0','0.0','00:00','00:00','00:00','00:00','00:00','23:59','" + vehicle_type.SelectedValue.ToString() + "','" + logText + "','" + vehicle_type.SelectedItem.Text + "'," + Convert.ToInt16(ddlIsDimts.SelectedValue) + ")";
command.ExecuteNonQuery();
serviceid = Convert.ToInt64(command.LastInsertedId);
command.CommandText = "insert into group_services (sys_service_id,sys_group_id,sys_added_date) values(" + serviceid + ",'1998',now())";
command.ExecuteNonQuery();
logText = "--------------------------------------\nDate: " + DateTime.Now.ToString("G") + "\nNotes: \nAdded to Vimal\n--------------------------------------\n";
command.CommandText = "update services set log=CONCAT(log,'" + logText + "') where id='" + serviceid + "'";
command.ExecuteNonQuery();
command.CommandText = "insert into tbl_history_devices (`sys_group_id`,`sys_service_id`) values('1998','" + serviceid + "')";
command.ExecuteNonQuery();
command.CommandText = "select name from `group` where id='" + group.SelectedValue + "'";
string groupName = (string)command.ExecuteScalar();
if (group.SelectedValue != "1998")
{
command.CommandText = "insert into group_services (sys_service_id,sys_group_id,sys_added_date) values(" + serviceid + "," + group.SelectedValue + ",now())";
command.ExecuteNonQuery();
logText = "--------------------------------------\nDate: " + DateTime.Now.ToString("G") + "\nNotes: \nAdded to " + groupName + "\n--------------------------------------\n";
command.CommandText = "update services set log=CONCAT(log,'" + logText + "') where id='" + serviceid + "'";
command.ExecuteNonQuery();
command.CommandText = "insert into tbl_history_devices (`sys_group_id`,`sys_service_id`) values('" + group.SelectedValue + "','" + serviceid + "')";
command.ExecuteNonQuery();
//--------------------------------------------------------------------------------------------------------------------------------------------
command.CommandText = "insert into device_mapping (device_id,device_imei,sys_simcard,vehID,NewVehID,repair_with_IMEI,reason,device_placed,current_mapped_status) values('" + deviceid + "','" + IMEI + "','" + SimID + "','" + serviceid + "','','','','',1)";
command.ExecuteNonQuery();
//--------------------------------------------------------------------------------------------------------------------------------------------
}
command.CommandText = "insert into latest_telemetry (sys_service_id,sys_msg_type,sys_proc_time,sys_proc_host,sys_geofence_id,sys_device_id,gps_time,jny_distance,jny_duration,jny_idle_time,jny_leg_code,jny_device_jny_id,des_movement_id,des_vehicle_id,tel_hours,tel_input_0,tel_input_1,tel_input_2,tel_input_3,tel_temperature,tel_voltage,tel_odometer) values('" + serviceid + "','0',date_add(now(),interval -330 minute),'None','0','" + deviceid + "',now(),'0.0','0','0','0','0','0','0','0',false,false,false,false,'0.0','0.0','0')";
command.ExecuteNonQuery();
if (hid_requested_id.Value != "")
{
command.CommandText = "update requested_device set device_status=1 where id=" + Convert.ToInt16(com_Obj.Safe(hid_requested_id.Value)) + "";
command.ExecuteNonQuery();
}
trans.Commit();
trans.Rollback();
command.Dispose();
return 1;
}
答案 0 :(得分：0)
在您的代码中，您尝试提交事务，然后在下一行中回滚它：
trans.Commit();
trans.Rollback();
其中的重点是什么？此时回滚肯定不起作用，因为事务已经提交。
我建议更新代码以遵循与此类似的结构：
MySqlCommand command = conn.CreateCommand();
MySqlTransaction trans = conn.BeginTransaction();
try
{
// Perform everything that you need, all queries, updates, etc.
trans.Commit(); // this line would be executed only if no exceptions were thrown
}
catch
{
// Your error handling code
trans.Rollback(); // rollback is only executed when exception is thrown
}