Bug #23920 | Error being thrown when connection is opened | ||
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Submitted: | 3 Nov 2006 8:00 | Modified: | 9 Dec 2006 8:03 |
Reporter: | Burton Posey | Email Updates: | |
Status: | No Feedback | Impact on me: | |
Category: | Connector / NET | Severity: | S3 (Non-critical) |
Version: | 5.0.1 | OS: | Windows (WinXP SP2) |
Assigned to: | CPU Architecture: | Any | |
Tags: | .net, 5.0, beta, connector, Visual Basic |
[3 Nov 2006 8:00]
Burton Posey
[8 Nov 2006 10:02]
Tonci Grgin
Hi Burton and thanks for your problem report. In order to help you I will need the following: - Exact MySQL server version, host OS - Client OS - *Exact* connector/NET version (5.0.x) - NET fw version (if on Win) - Small but *complete* test case (VS I presume) showing this error I suspect something's wrong with your code since I am able to work with c/NET without problems.
[8 Nov 2006 18:16]
Burton Posey
I believe I had mentioned that the exact same code worked with the older connector (1.0.8), but not the new 5.0.1 beta one. The code that wasn't working... was the as-is table read-on data example from the 5.0.1 connector download, as well as my test case. I believe on the packaged example the problem was being thrown on the reader when I sent my information through with the appropriate button click. So, in other words, when I changed my references to the older connector dll from the newer one... I had to change no code whatsoever to get both programs to work. The Host's mySQL version is: 4.1.8-Max I'm confident that they are running Linux, but not 100% sure. My teacher conducting my independent study doesn't like working with windows and works on databases all day, so I would say Linux. I'm running WinXP SP2 Using Visual Studio .NET 2005 (I believe I had to up-convert the examples to 2005. Like I said, I can run it fine right now with the older (1.0.8) dll, but something could have changed in the conversion process). Here is an example that I just retested with the 5.0.1 MySQL.Data Reference in place. This program was tested right before I went to bed last night with the 1.0.8 connector dll reference in place. With 5.0.1, it does not work. With 1.0.8, it works fine. I took all of the personal stuff out and put in the <stuffname>. Public Function CreateConnection() myConnection = New MySqlConnection connStr = "" If Not myConnection Is Nothing Then myConnection.Close() If connStr = "" Then connStr = "Database=<insertdatabasename>;" & _ "Data Source = <enterdatasource>;" & _ "User ID=<enteruserid>;" & _ "Password=<enterpw>;" & _ "Allow Zero Datetime=true;" & _ "pooling=False;" End If myConnection.ConnectionString = connStr Try myConnection = New MySqlConnection(connStr) myConnection.Open() Return True Catch ex As MySqlException MessageBox.Show("Error connecting to the server: " + ex.Message) End Try Return False End Function The error is thrown at the line MyConnection.Open() and that error is: An unhandled exception of type 'System.NullReferenceException' occurred in MySql.Data.dll If you wanted to run MyConnection.Close() before the open statement, it works. I'm not sure if that is worth anything. Thanks for the help.
[9 Nov 2006 8:03]
Tonci Grgin
Hi Burton. I asked for *complete* sample. If you want to pursue this further, please attach *entire* VS project. You have not answered all of my questions: - NET fw version (if on Win) Is it possible you're using NET fw 1.x? If so, failure is expected, see ReleaseNotes. Consider following C# code / environment which works with no problem: C:\mysql\bin>mysql -uroot test Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 11 to server version: 4.1.22-log NET fw 2.0 on WinXP Pro SP2 //Assembly MySql.Data D:\svn-net\tags\5.0.1-beta\mysqlclient\bin\net-2.0\Debug\MySql.Data.dll using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using MySql.Data; using MySql.Data.MySqlClient; -- private void button1_Click(object sender, EventArgs e) { MySqlConnection conn = new MySqlConnection(); conn.ConnectionString = "DataSource=localhost;Database=test;UserID=root;Password=;PORT=3306;Allow Zero Datetime=true;pooling=False;"; conn.Open(); MySqlCommand command = new MySqlCommand(); command.CommandText = "SELECT * FROM blacklist"; command.CommandType = CommandType.Text; command.Connection = (MySqlConnection)conn; MySqlDataReader dr = command.ExecuteReader(); MessageBox.Show("Before READ"); dr.Read(); MessageBox.Show("After READ"); MessageBox.Show(dr.GetName(0)); MessageBox.Show(dr.GetName(1)); dr.Close(); MessageBox.Show("Ready"); command.Dispose(); conn.Close(); }
[10 Dec 2006 0:00]
Bugs System
No feedback was provided for this bug for over a month, so it is being suspended automatically. If you are able to provide the information that was originally requested, please do so and change the status of the bug back to "Open".