Error with OleDb when using text field in table.

[malitice]

I wrote a program that works just fine normally, but when I change one of the fields in the mysql database to a text field (or mediumtext, long text blob etc) the program throws an error:

An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in system.data.dll

Additional information: No error information available: DB_E_NOTABLE(0x80040E37).

And flags the bold line:

EDIT: for some reason the forums are adding spaces to the line by the 'n', those are not in the code.

	 Dim fdCon As New OleDb.OleDbConnection("Provider=MySQLProv;Data Source=test;User Id=root;Password=;")
		Dim fdCom As New OleDb.OleDbCommand("SELECT * FROM lib1 WHERE id = '" & TextBox1.Text & "'", fdCon)
		fdCom.Connection.Open()
[b]	   Dim fdRead As OleDb.OleDbDataReader = fdCom.ExecuteReader(CommandBehavior.CloseConnection)[/b]
		While fdRead.Read
		do somthing
		end while

It normally works but as soons as the field type is changed (to larger than tinytext) it errors. Is there a byte or size limit when using OleDb?

 

[malitice]

I retried it a few different ways, and it gives me the same error with the following as my table:

CREATE TABLE `test` (
  `test` text NOT NULL
) TYPE=MyISAM;

and the following as my connection

	   Dim fdCon As New OleDb.OleDbConnection("Provider=MySQLProv;Data Source=test;User Id=root;Password=;")
		Dim fdCom As New OleDb.OleDbCommand("SELECT * FROM test", fdCon)
		fdCom.Connection.Open()
		Dim fdRead As OleDb.OleDbDataReader = fdCom.ExecuteReader(CommandBehavior.CloseConnection)
		While fdRead.Read
			textbox1.Text = fdRead.GetValue(0)
		End While
		fdCom.Connection.Close()

So my question is is there a way to be able to read a text field in a mysql table?

 

[malitice]

Well after some testing and reading the myoledb manual I figured it out.

For reference for anybody else that needs it

 Dim fdCom As New OleDb.OleDbCommand("SELECT substring(Table,1,XXXXX) FROM test", fdCon)

Table is the name of the field, the xxxxxx are the number of characters you want to show.