【发布时间】:2014-05-24 09:29:22
【问题描述】:
我想为我的应用程序创建一个登录页面。当一切都完成并且我想登录时,它总是显示
错误:
Microsoft Jet 数据库引擎无法打开文件“C:\Users\Gio\Documents\Visual Studio 2012\Projects\CSS\CSS\bin\Debug”。它已被其他用户独占打开,或者您需要权限才能查看其数据。
代码:
Imports System.Data.OleDb
Public Class Login
Dim path = System.Windows.Forms.Application.StartupPath
Private Sub Login_Load(sender As Object, e As EventArgs) Handles MyBase.Load
End Sub
Private Sub loginbtn_Click(sender As Object, e As EventArgs) Handles loginbtn.Click
Dim connection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Users\Gio\Documents\Visual Studio 2012\Projects\CSS\CSS\bin\Debug;")
Dim command As New OleDbCommand("SELECT [ID] FROM [User] WHERE [usernameField] = Username AND [passwordField] = Password", connection)
Dim usernameparam As New OleDbParameter("Username", Me.usernamebox.Text)
Dim passwordparam As New OleDbParameter("Password", Me.passwordbox.Text)
command.Parameters.Add(usernameparam)
command.Parameters.Add(passwordparam)
command.Connection.Open()
Dim reader As OleDbDataReader = command.ExecuteReader()
If reader.HasRows Then
MessageBox.Show("Login Succesful!")
passwordbox.Text = ""
Me.Hide()
Main.Show()
Else
MessageBox.Show("Username and Password are incorrect!")
passwordbox.Text = ""
End If
command.Connection.Close()
End Sub
Private Sub exitbtn_Click(sender As Object, e As EventArgs) Handles exitbtn.Click
Me.Close()
End Sub
End Class
【问题讨论】:
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你是用ms access独占打开access数据库的吗?
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如何检查我是否有玉? @jay 感谢您的编辑。这个网站还是新手 :)
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抱歉,您没有在连接字符串中指定 ms 访问文件名。
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啊,是的,你是对的。但是在我指定它之后,错误发生了变化。它变成了找不到文件'C:\Users\Gio\Documents\Visual Studio 2012\Projects\CSS\CSS\bin\Debug\CSS.mdb'。
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使用 Windows 资源管理器浏览这个 'C:\Users\Gio\Documents\Visual Studio 2012\Projects\CSS\CSS\bin\Debug' 并查看 CSS.mdb 文件是否存在,否则你需要将文件复制到那里。
标签: vb.net