ADO.NET :: Getting Error - The Data Types Text And Varchar Are Incompatible In The Equal To Operator?
Nov 10, 2010
So admitingly I am fairly new at .NET...I have been a PHP guy for rather long time...
Heres my code:
[code]....
Essentially what I am trying to do is query the SQL database by the username. This above code is a method within the user respository for fetching a user by their username. The variable "username" is passed in as a string.
When the method is called a recieve the following error:
The data types text and varchar are incompatible in the equal to operator.
This to me is rather confusing since the field in the database, user_username, is a text and the variable passed in, as said, is a string. They should be synonomous for all practical purposes.
Dim intusercount As Integer = 0 Using connection As New SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|Database.mdf;Integrated Security=True;User Instance=True") Using command As New SqlCommand("SELECT [ID] FROM [Members] WHERE [Username]=@Username AND [Password]=@Password", connection) command.Parameters.Add("@Username", Data.SqlDbType.VarChar).Value = TextBox1.Text command.Parameters.Add("@Password", Data.SqlDbType.VarChar).Value = TextBox2.Text connection.Open() intusercount = command.ExecuteScalar connection.Close() If intusercount > 0 Then MsgBox("Good") Else MsgBox("Bad") End If End Using End Using Error:
The data types text and varchar are incompatible in the equal to operator.
Source Error: Quote:
Line 11: command.Parameters.Add("@Password", Data.SqlDbType.VarChar).Value = TextBox2.Text Line 12: connection.Open() Line 13: intusercount = command.ExecuteScalar Line 14: connection.Close() Line 15: If intusercount > 0 Then
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I have table structure like that
[Code]....
Everyone suggests to change ntext type to nvarchar(MAX) and life will be beautyfull. But... First, I need ntext, simply because there should be text in this field.
nvarchar(MAX) equals 4096 bytes which is to small for large text. Second, I already have table with ntext field, which does not cause this error.
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