我在VB.NET中有一個函數,它在啓動主應用程序之前向MySQL數據庫驗證用戶身份。下面是函數的代碼:MySqlDataReader在構建時給出錯誤
Public Function authConnect() As Boolean
Dim dbserver As String
Dim dbuser As String
Dim dbpass As String
dbserver = My.Settings.dbserver.ToString
dbuser = My.Settings.dbuser.ToString
dbpass = My.Settings.dbpass.ToString
conn = New MySqlConnection
myConnString = "server=" & dbserver & ";" & "user id=" & dbuser & ";" & "password=" & dbpass & ";" & "database=rtadmin"
Dim myCommand As New MySqlCommand
Dim myAdapter As New MySqlDataAdapter
Dim myData As New DataTable
Dim myDataReader As New MySqlDataReader
Dim query As String
myCommand.Parameters.Add(New MySqlParameter("?Username", login_usr_txt.Text))
myCommand.Parameters.Add(New MySqlParameter("?Password", login_pass_txt.Text))
query = "select * from users where user = ?Username and passwd = ?Password"
conn.ConnectionString = myConnString
Try
conn.Open()
Try
myCommand.Connection = conn
myCommand.CommandText = query
myAdapter.SelectCommand = myCommand
myDataReader = myCommand.ExecuteReader
If myDataReader.HasRows() Then
MessageBox.Show("You've been logged in.", "RT Live! Information", MessageBoxButtons.OK, MessageBoxIcon.Information)
End If
Catch ex As Exception
End Try
Catch ex As Exception
End Try
End Function
的功能還沒有完成,有需要啓動應用程序之前完成,因爲我使用一個MessageBox顯示的結果一些其他的東西登錄嘗試。
是我得到的錯誤是:
錯誤1「MySql.Data.MySqlClient.MySqlDataReader.Friend子新(CMD作爲MySql.Data.MySqlClient.MySqlCommand,聲明例如MySQL。 Data.MySqlClient.PreparableStatement,behavior As System.Data.CommandBehavior)'在此上下文中不可訪問,因爲它是'Friend'。 C:\ Users \ Mario \ documents \ visual studio 2010 \ Projects \ Remote Techs Live!\ Remote Techs Live!\ Login.vb 43 13 Remote Techs Live!
任何想法?
非常感謝。這工作,我從來沒有意識到新的。 – TuxMeister 2010-05-12 14:27:02