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这个想法是创建一个消息框,用于在发送消息时将我的用户名,消息和发布日期时间存储到数据库中。VB数据集问题
很快就意识到,如果用户改变了他的名字会怎么样?
因此,我决定使用用户ID(icn)来标识消息海报。然而,我的代码块不断给我同样的错误。表示数据集ds2中没有行。
我试过我的SQL查询,它完美的工作,所以我真的很需要帮助,在我的代码块中发现错误。
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim name As String
Dim icn As String
Dim message As String
Dim time As String
Dim tags As String = ""
Dim strConn As System.Configuration.ConnectionStringSettings
strConn = ConfigurationManager.ConnectionStrings("ufadb")
Dim conn As SqlConnection = New SqlConnection(strConn.ToString())
Dim cmd As New SqlCommand("Select * From Message", conn)
Dim daMessages As SqlDataAdapter = New SqlDataAdapter(cmd)
Dim ds As New DataSet
cmd.Connection.Open()
daMessages.Fill(ds, "Messages")
cmd.Connection.Close()
If ds.Tables("Messages").Rows.Count > 0 Then
Dim n As Integer = ds.Tables("Messages").Rows.Count
Dim i As Integer
For i = 0 To n - 1
icn = ds.Tables("Messages").Rows(i).Item("icn")
Dim cmd2 As New SqlCommand("SELECT name FROM Member inner join Message ON Member.icn = Message.icn WHERE message.icn = @icn", conn)
cmd2.Parameters.AddWithValue("@icn", icn)
Dim daName As SqlDataAdapter = New SqlDataAdapter(cmd2)
Dim ds2 As New DataSet
cmd2.Connection.Open()
daName.Fill(ds2, "PosterName")
cmd2.Connection.Close()
name = ds2.Tables("PosterName").Rows(0).Item("name")
message = ds.Tables("Messages").Rows(i).Item("message")
time = ds.Tables("Messages").Rows(i).Item("timePosted")
tags = time + vbCrLf + name + ": " + vbCrLf + message + vbCrLf + tags
Next
txtBoard.Text = tags
Else
txtBoard.Text = "nothing to display"
End If
End Sub