MySQL Bugs: #16126: Unable to use MySql as datasource for the ASP.NET 2.0 SqlDataSource object

Bug #16126	Unable to use MySql as datasource for the ASP.NET 2.0 SqlDataSource object
Submitted:	2 Jan 2006 14:46	Modified:	29 Oct 2006 5:03
Reporter:	Emanuele Scozzafava	Email Updates:
Status:	Closed	Impact on me:	None
Category:	Connector / NET	Severity:	S2 (Serious)
Version:	1.0.7	OS:	Any (all)
Assigned to:		CPU Architecture:	Any

Description:

Using MySql as DataSource for SqlDataSource ASP.NET 2.0 object I obtain the following error:

"Unable to find the requested .Net Framework Data Provider.  It may not be installed."

How to repeat:
copy this code within the body of a asp.net 2.0 page:

<asp:SqlDataSource ID="SqlDataSource1" 
        runat="server" 
        ConnectionString="Data Source=100.100.100.46;User ID=root"
        ProviderName="MySql.Data.MySqlClient" 
        SelectCommand="SELECT * FROM mysql">
</asp:SqlDataSource>
<asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1">
</asp:GridView>

Suggested fix:
The SqlDataSource object seems that internally uses a DbProviderFactory.
These classes are listed within the system.data section of machine.config.

For the correct use of the SqlDataSource component it's necessary that .net data provider for mysql implement a class like SqlClientFactory - within the System.Data.SqlClient namespace - and add this class in machine.config file.

I just ran into this myself. The MySqlClient works great. Now i wanted to try creating a simple DataGrid. hit this limitation.

It would be great to have this taken care of. i might be willing to try myself, but I'm not sure how quickly I could come up to speed.

Tim Hanson

I think that if MySql connector implements a class from DbProviderFactory abstract class - for example a class with the name MySqlFactory - and register it within the machine.config in system.data/DbProvidersFactories section, like other dbproviderfactories for SQLServer, Oracle or ODBC, Visual Studio 2005 could use it for tools like "Add connection" of the "Database Explorer".

does anyone have a short how-to on MySql.Data and MySqlClient ? my first attempt worked, but now i got compile errors and am not quite sure what to do.

--tbh

sorry, just re-read my post -badly written. 

i meant a how-to on *building* them with Visual Studio. if i open the supplied project file, MySql.Data.csproj, and convert it to DotNet 2.0 and build it works. (there are about 50 warnings, but no errors.) ah, I see it created a new MySql.Data.dll under bin/net-1.1/Debug.

i guess i have to tweak the build settings.

To resolve the problem a new class factory is needed.
This is an example on how could be implemented.

public sealed class MySqlClientFactory : DbProviderFactory 
{
    public static readonly MySqlClientFactory Instance;

    static MySqlClientFactory()
    {
        MySqlClientFactory.Instance = new MySqlClientFactory();
    }

    public override DbConnection CreateConnection()
    {
        return (DbConnection)(new MySqlConnection());
    }

    ... other methods ...

}

The problem is that MySqlConnection implements the IDbConnection interface and not inherits from System.Data.Common.DbConnection, then it's impossible to cast MySqlConnection into a DbConnection object.

A solution is to configure the datasource as ODBC.

Using Odbc is a work around. not a solution.

I've implemented a fix per Emanuele Scozzafava's suggestion:  Created a MySqlClientFactory class and modified the data objects to inherit from the proper base classes.

I'd like to share it but don't know how.  Can someone point me in the right direction to submit my changes?

Hi Jim. You can post it here with your comments.

Has anyone made any progress on this issue?  I really don't want to use ODBC. I'm tempted to build the factory class myself...

Thanks,
Jeremy

Jim McGowen had put together something, but I'm not sure where it stands...I would love to get a look at it, test it, etc...(hint to Jim) otherwise my employer has got me too busy to look at it. maybe come September.......

I created one long time ago, I would post mine here for you guys if I could but only registered developers or the original poster can upload files.  So I will temporarily post it to http://myjavaserver.com/~personalpc/MySqlClient1.0.7.5.zip.  If someone that has upload abilities would be so kind to post it in this bug.

Side note, I have also made an Enterprise Library extension that uses can connect to MySQL if anyone is interested.

Hi Could you please provide me the extension for Enterprise Library 2006. Also can you provide me the MySqlClient that is using DBProviderFactory and all the DbConnection etc. as a base class

Amit,
As was stated in my post, you can get the MySqlClient that I built from the link
in the post.  As for the Enterprise Library extension, if you could provide me
with an e-mail address I will send it to you.

My Email id is "kejriwal.amit@hotmail.com". I really appreciate your help as this will save me time.

Thank you

Amit

Wesley

Just scanned through and done compile but I havent tested yet.  I would like to look at your enterprise version while I'm at it - you can use email address o_kerux@yahoo.com

Many thanks
Tony

This is my first post, so please excuse my ignorance. But what are the disadvantages to using ODBC?

Wesley,
I tried using the MySql.Data library but it is failing when i am using enterprise library and call BeginTransaction as follows:

              Database db1=Microsoft.Practices.EnterpriseLibrary.Data.DatabaseFactory.CreateDatabase("MySql");
              DbConnection conn=db1.CreateConnection();
              conn.Open();
              DbTransaction tras=conn.BeginTransaction();
              tras.Dispose();
               conn.Close();

it throws the error "42000 check your sql syntax" do you know why this error is coming?

Thank you
Amit Kejriwal

Amit,
It has nothing to do with Enterprise Library, it does have to do with the MySql.Data library.  What version of MySQL are you using?  I have never done anything with transactions, but looking at the code for the MyConnection.BeginTransaction, it creates a new transaction and executes the following command: "SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ", then "BEGIN", then it returns the MySqlTransaction.

I would post my work, but I can't add files and don't have a public server to make it available.  Looks like Wesley's got it covered now anyway.  If anyone still wants it, post your email address and I'll send it to you.

As far as I know, this was never intended to work in 1.0 branch.
I'm closing this interesting discussion now.

I'm setting this back to verified because we have more information.  First, this will never work with the 1.x providers since it requires a fully ADO.net 2.0 compliant provider.

Second, I just tested this with a build of Connector/Net 5.0.2 and it works as expected so this should be fixed by the time 5.0.2 is released.  I'm leaving it as verified since I have not yet committed the fix.

Hi Reggie,

I tested the code of my first post with the connector 5.0.1 and it works fine.

There is another thing that it may be usefull (this is a feature request).

With Visual Studio 2005 there are many wizard, one of these is "Connect to datasource" under Tools menu.
In this wizard there is the list of data provider registered but MySQL doesn't appear in the list :(

Fixed in 5.0.2

The fix for bug #23245 also fixes this issue.

Hi Emanuele,

I can't seem to get the snippet of code you mentioned working with new .Net Connector (5.0.1).  How did you get it to reference the new data provider? 

Using your code, I've changed the IP address and my database root user doesn't have a password.

However, when I run your code I get the following error:

Failed to find or load the registered .Net Framework Data Provider.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Configuration.ConfigurationErrorsException: Failed to find or load the registered .Net Framework Data Provider.

Do you have any suggestions?

Thanks!

A note has been added to the 5.0.2 changelog.

Hi Wesley,
          Can you send me Enterprise Library 2006 extension for MySql 5.0.3, my mail id senthil_kalla@yahoo.co.in.

Thanks

hi ,

i am having same problem with the mysql.net connector v5.1.5. I can assign as datasource in windows application but in ASP.NET, it doesnot show up in driver list. 

if anyone has done this, if u could guide me or even send me the library, i would appreciate it.

heres my add

nakarmi_sandeep@hotmail.com
sandeep.nakarmi@gmail.com

thank you
sandeep

Hi, I was developing ASP.NET 2.0 website with MySQL 5.1 and the connector MySQL.Net 5.2.5. I had the same problem when I upload my code to the shared host. So I add the following code in the web.config. That solved the problem. It may help you guys.

<system.data>
  <DbProviderFactories>
      <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=5.2.5.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
    </DbProviderFactories>
  </system.data>

Thanks a lot Irwan, It worked.