How to read any string from access database using adodb

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I want to read string from one column but when i try this one i got error that is "Data type mismatch in criteria expression."

VB

cmdOLEDB.CommandText = "SELECT usern FROM Aut WHERE usern=" & textbox1.Text
cmdOLEDB.Connection = cnnOLEDB
Dim rdrOLEDB As OleDbDataReader = cmdOLEDB.ExecuteReader
If rdrOLEDB.Read = True Then
MsgBox("Record found")
rdrOLEDB.Close()
Exit Sub
Else
MsgBox("Record not found")
rdrOLEDB.Close()
Exit Sub
End If

Posted 29-Dec-12 8:57am

Vishal I. Sahuji

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Wendelius · Answer 1 · 2012-12-29T09:07:00

Solution 1

Never ever concatenate data directly to your SQL statement. Instead use OleDbParameter[^].

So your query part should look like following:

C#

cmdOLEDB.CommandText = "SELECT usern FROM Aut WHERE usern = ?"
cmdOLEDB.Parameters.Add("username", OleDbType.VarChar, 50).Value = textbox1.Text;
...

Posted 29-Dec-12 9:07am

Wendelius

Updated 29-Dec-12 9:08am

v2

Comments

Espen Harlinn 30-Dec-12 8:10am

5'ed!

Wendelius 4-Jan-13 15:12pm

Thanks! :D