Mysql连接器 - MultipleActiveResultSets问题

Question

First off, I have spent hours looking for a fix - maybe I just need another pair of eyes on this problem.

I'm currently coding ac# application for myself(Personal use). Im running the latest MySQL connector library from mysql.com

My connection string is

public string SQLConnection = "Server=localhost;Database=data;Uid=root;Pwd=ascent;charset=utf8;MultipleActiveResultSets=True;";

My issue is regarding MultipleActiveResultSets=True; . When this is included in my SQLConnection string the MySQL library is unable to connect. View the pic below to view my findings

http://i62.tinypic.com/25a57p1.png full image: http://i62.tinypic.com/25a57p1.png

When MultipleActiveResultSets=True; is removed from the connection string, I get this result

http://i58.tinypic.com/2useaom.png full image: http://i58.tinypic.com/2useaom.png

I get a successful connection.

The reason for MultipleActiveResultSets is because I'm using 2 MySqlDataReader at the same time - This however can't be changed.

If anyone knows why this is failing, then please suggest your fix.

My local MySQL server version: 5.6.17

Answer 1

I assume MySql connector doesn't support MARS (Multiple active result sets). In such case you cannot use it at more than one place at the same time.

Answer 2

The problem is not solved but I have found a work around.

I removed MultipleActiveResultSets=True; from the connection string. I then created a list where I saved the data from MySqlDataReader, I then closed the reader and reopen a new one which then I got the rest of the data from the database. Then simply merged the results together in the list.

So yeah, a temp fix.

If someone knows the proper fix then please comment, otherwise I will be using my temp fix.

Thanks guys.

Answer 3

另一个可以导致性能下降但可以用作快速修复的选项是为第二个读取器再打开一个数据库连接，并在完成后将其关闭。