asp.net - insert 命令在表中插入几行

Question

我正在使用此代码插入数据库，但每次插入多行时，有什么问题？

    Protected Sub btnSave_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSave.Click
    Dim dob As DateTime = DateTime.Parse(Request.Form(TextBox6.UniqueID))

    Dim conString As String = ConfigurationManager.ConnectionStrings("sqlexpress").ConnectionString

    Using con As New System.Data.SqlClient.SqlConnection(conString)

        Dim com As New SqlCommand("INSERT INTO main (GroupID, Name, Description, ModeUD, StartNum, StartDate, Rate) VALUES (" & TextBox1.Text & ",'" & TextBox2.Text & "','" & TextBox3.Text & "'," & Me.DropDownList1.SelectedItem.Value & "," & TextBox4.Text & ",'" & dob & "'," & TextBox5.Text & ")", con)

        con.Open()
        com.ExecuteNonQuery()
        con.Close()





    End Using
End Sub

Answer 1

您是否检查过您的代码块是否被多次调用？一种快速的方法是在里面放一个警告框，这样你就可以计算它运行的次数。

Answer 2

嗯……有很多问题。第一个是 SQL 注入的可能性，您应该使用命名参数。另一个是about这一行Dim com As New...也应该在一个Using子句中。

但是，那段代码中没有任何内容表明它插入了超过 1 条记录。我建议你在行上设置一个断点ExecuteNonQuery，看看发生了什么。

Answer 3

我已经检查并洞按钮单击执行了两次，我已将代码更改为这个并已解决，但我不知道为什么单击事件执行了两次：

 Dim i As Boolean = True


  Protected Sub btnSave_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSave.Click
    Dim dob As DateTime = DateTime.Parse(Request.Form(TextBox6.UniqueID))

    Dim conString As String = ConfigurationManager.ConnectionStrings("sqlexpress").ConnectionString





    Using con As New System.Data.SqlClient.SqlConnection(conString)
        con.Open()
        Using com As New SqlCommand("INSERT INTO main (GroupID, Name, Description, ModeUD, StartNum, StartDate, Rate) VALUES (" & TextBox1.Text & ",'" & TextBox2.Text & "','" & TextBox3.Text & "'," & Me.DropDownList1.SelectedItem.Value & "," & TextBox4.Text & ",'" & dob & "'," & TextBox5.Text & ")", con)
            If i = True Then





                com.ExecuteScalar()
                i = False
            End If

        End Using
        con.Close()

    End Using

End Sub