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Acces and asp.net
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Diep-Vriezer View Drop Down
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    Posted: 12 September 2003 at 3:58pm

Hey all,

I've got some sort of a problem, when I try the following: I want to compare an unique id to a field in the database, and then read another collum on that row. How is this done? I tried alot, but I kept recieving this kind of error:

Data type mismatch in criteria expression.

Sooow, how can I first be sure the unique id exists in the table (collum is called 'Uid'), and if so, retrieve the content of the collum next to it (collum is called 'Loggedin').

// Edit: Of course in ASP.NET



Edited by Diep-Vriezer
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Diep-Vriezer View Drop Down
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Points: 831 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Diep-Vriezer Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2003 at 4:34am
Alright, not really a clear question. How about this: I want to read a collumn named Loggedin on a row WHERE Uid = aUniqueId.
 
I made up the following code:

-------

Dim aConnection As OleDbConnection, aCommand As OleDbCommand, aDatareader As OleDbDataReader, aString As String

aConnection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\Pub\wwwroot1\Components\Databases\Account.mdb;User Id=admin;Password=;")

aCommand = New OleDbCommand()

With aCommand

.CommandText = "SELECT * from tblLoggedin where Uid = '" & aUniqueId & "'"

.CommandType = CommandType.Text

.Connection = aConnection

End With

aConnection.Open()

aDatareader = aCommand.ExecuteReader()

While aDatareader.Read

aString = ""

aString = aDatareader.Item("Loggedin")

End While

aDatareader.Close()

aConnection.Close()

-------

Now I revieve the following error: (I just copied the entire error page )

-------

Server Error in '/' Application.

Data type mismatch in criteria expression.

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.Data.OleDb.OleDbException: Data type mismatch in criteria expression.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 

[OleDbException (0x80040e07): Data type mismatch in criteria expression.]
    System.Data.OleDb.OleDbCommand.ExecuteCommandTextErrorHandli ng(Int32 hr) +41
    System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleRe sult(tagDBPARAMS dbParams, Object& executeResult) +174
    System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& ; executeResult) +92
    System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavio r behavior, Object& executeResult) +65
    System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(Command Behavior behavior, String method) +112
   System.Data.OleDb.OleDbCommand.ExecuteReader(CommandBehavior behavior) +69
   System.Data.OleDb.OleDbCommand.ExecuteReader() +7
   denheijer.Account.CheckLoggedin(String aUniqueId, String cIp) in C:\Documents and Settings\Floris den Heijer\VSWebCache\DODGER\Components\Classes\Account.vb:32
   denheijer.Start.Page_Load(Object sender, EventArgs e) in C:\Documents and Settings\Floris den Heijer\VSWebCache\DODGER\Sections\Start\Start.aspx.vb:33
   System.Web.UI.Control.OnLoad(EventArgs e) +67
   System.Web.UI.Control.LoadRecursive() +35
   System.Web.UI.Page.ProcessRequestMain() +731

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TYSON View Drop Down
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Points: 142 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TYSON Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2003 at 8:14am

Try

.CommandText = "SELECT * from tblLoggedin where Uid = " & aUniqueId & ""
http://www.fuo-motorsports.com/
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Diep-Vriezer View Drop Down
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Joined: 06 August 2003
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Points: 831 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Diep-Vriezer Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2003 at 8:42am
Well, I already made it by simply changing the aUniqueId to the field it is in the database (an integer), and everything works fine now. Thanks anyway!
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