Question

我正在开展一个学校项目，我们应该将用户输入的数据保存到我们在项目中创建的数据库中。我在项目的App_Data文件夹中创建了一个名为“db1”的数据库，并创建了一个名为“Video_Games”的表。我的代码有点像弗兰肯斯坦的怪物，它来自我的教科书和在线例子。

Protected Sub btnTable_Click(sender As Object, e As EventArgs) Handles btnTable.Click
    Dim strTitle As String = txtTitle.Text
    Dim strConsole As String = txtConsole.Text
    Dim strYear As String = txtYear.Text
    Dim strESRB As String = txtRating.Text
    Dim strScore As String = txtScore.Text
    Dim strPublisher As String = txtPublisher.Text
    Dim strDeveloper As String = txtDeveloper.Text
    Dim strGenre As String = txtGenre.Text
    Dim strPurchase As String = calDate.SelectedDate.ToString

    Dim conn As SqlConnection
    Dim cmd As SqlCommand

    Dim cmdString As String = "INSERT INTO Video_Games(Title, Console, Year, ESRB, Score, Publisher, Developer, Genre, Purchase) 
                                VALUES (@strTitle, @strConsole, @strYear, @strESRB, @strScore, @strPublisher, @strDeveloper, @strGenre, @strPurchase)"


    conn = New SqlConnection("Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\db1;Integrated Security=True;User Instance=True")
    cmd = New SqlCommand(cmdString, conn)

    cmd.Parameters.AddWithValue("@strTitle", strTitle)
    cmd.Parameters.AddWithValue("@strConsole", strConsole)
    cmd.Parameters.AddWithValue("@strYear", strYear)
    cmd.Parameters.AddWithValue("@strESRB", strESRB)
    cmd.Parameters.AddWithValue("@strScore", strScore)
    cmd.Parameters.AddWithValue("@strPublisher", strPublisher)
    cmd.Parameters.AddWithValue("@strDeveloper", strDeveloper)
    cmd.Parameters.AddWithValue("@strGenre", strGenre)
    cmd.Parameters.AddWithValue("@strPurchase", strPurchase)

    conn.Open()

    cmd.ExecuteNonQuery()

    conn.Close()

End Sub

我得到的错误来自“conn.Open（）”行是： System.Data.dll中发生了'System.Data.SqlClient.SqlException'类型的异常，但未在用户代码中处理

其他信息：建立与SQL Server的连接时发生与网络相关或特定于实例的错误。服务器未找到或无法访问。验证实例名称是否正确以及SQL

根据错误判断，我假设它与我的'conn = New SqlConnection'行有关，但我找不到如何使其工作。感谢您提供任何帮助。

Answer 1

从https://www.connectionstrings.com获取连接字符串。您可以使用可信连接或标准安全性。当你安装mssql时定义用户登录混合模式或正常。混合模式表示使用用户名和密码

Answer 2

我想通了，实际上采取了完全不同的方向;我去了Access数据库溃败而不是SQL。谢谢大家的帮助和支持。我使用的代码是：

Protected Sub btnDisplay_Click(ByVal sender As Object, ByVal e As System.EventArgs)

    Dim strTitle As String = txtTitle.Text
    Dim strConsole As String = txtConsole.Text
    Dim strYear As String = txtYear.Text
    Dim strESRB As String = txtRating.Text
    Dim strScore As String = txtScore.Text
    Dim strPublisher As String = txtPublisher.Text
    Dim strDeveloper As String = txtDeveloper.Text
    Dim strGenre As String = txtGenre.Text
    Dim strPurchase As String = calDate.SelectedDate.ToString
    Dim strDate As Date = calDate.SelectedDate
    Dim intYear As Integer = CInt(strYear)

    If strDate > Date.Today Then
            Response.Write("<script>alert('Error: The selected date must be today or earlier')</script>")
        Else
        lblDisp2.Text = "Data Saved to Database"

        Dim connection As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\db1.accdb"
        Dim query As String = "INSERT INTO [Video_Games](Title, Console, Year_Released, ESRB, Score, Publisher, Developer, Genre, Purchase) 
                                VALUES (@strTitle, @strConsole, @strYear, @strESRB, @strScore, @strPublisher, @strDeveloper, @strGenre, @strPurchase)"

        Dim con As New OleDbConnection(connection)
        Dim cmd As New OleDbCommand()
        cmd.CommandText = query
        cmd.CommandType = CommandType.Text
        cmd.Connection = con

        cmd.Parameters.AddWithValue("@strTitle", strTitle)
        cmd.Parameters.AddWithValue("@strConsole", strConsole)
        cmd.Parameters.AddWithValue("@strYear", strYear)
        cmd.Parameters.AddWithValue("@strESRB", strESRB)
        cmd.Parameters.AddWithValue("@strScore", strScore)
        cmd.Parameters.AddWithValue("@strPublisher", strPublisher)
        cmd.Parameters.AddWithValue("@strDeveloper", strDeveloper)
        cmd.Parameters.AddWithValue("@strGenre", strGenre)
        cmd.Parameters.AddWithValue("@strPurchase", strPurchase)

        con.Open()
        Dim dr As OleDbDataReader = cmd.ExecuteReader()
        Dim dt As New DataTable()
        dt.Load(dr)
        con.Close()
    End If

End Sub

将用户输入保存到数据库表asp.net

2 个答案: