(ASP.NET)SQL数据读取器返回空值
我连接到一个数据库,然后使用SQLDataReader解析这些结果,然后将这些结果放入变量中,以便以后使用。问题是我的所有results.items都返回空值。然而,DataReader在调试时显示了正确的字段计数(ASP.NET)SQL数据读取器返回空值,asp.net,sql,datareader,Asp.net,Sql,Datareader,我连接到一个数据库,然后使用SQLDataReader解析这些结果,然后将这些结果放入变量中,以便以后使用。问题是我的所有results.items都返回空值。然而,DataReader在调试时显示了正确的字段计数 Private Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowC
Private Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
If e.CommandName = "editPost" Then
'Remove DataGrid'''''''''
GridView1.Visible = False
'''''''''''''''''''''''''
Dim index As Integer = Convert.ToInt32(e.CommandArgument)
Dim row As GridViewRow = GridView1.Rows(index)
Dim ID As String = GridView1.Rows(index).Cells(0).Text
''''''''''''''''''''''''''''''''''''''''CREATE Controls for Placeholder
Dim editEditor As New CuteEditor.Editor
Dim hiddenID As New HiddenField
hiddenID.ID = "hiddenID"
hiddenID.Value = ID
editEditor.ID = "editEditor"
Dim subjectTXT As New TextBox
subjectTXT.ID = "editorSubject"
Dim br As New Literal
Dim submitChanges As New Button
Dim sbjLabel As New Label
submitChanges.ID = "submitChanges"
submitChanges.Text = " Submit Changes "
submitChanges.Height = 40
submitChanges.Width = 300
sbjLabel.Text = "Subject: "
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
editEditor.AutoConfigure = CuteEditor.AutoConfigure.Simple
br.Text = "<br/><br/>"
plcEditor.Controls.Add(hiddenID)
plcEditor.Controls.Add(sbjLabel)
plcEditor.Controls.Add(subjectTXT)
subjectTXT.Width = "100"
subjectTXT.Height = "25"
subjectTXT.CssClass = "editInput"
plcEditor.Controls.Add(br)
plcEditor.Controls.Add(editEditor)
plcEditor.Controls.Add(br)
plcEditor.Controls.Add(br)
plcEditor.Controls.Add(submitChanges)
submitChanges.OnClientClick = UpdatePost()
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Dim connStr As String = ConfigurationManager.ConnectionStrings("oakfratnewsConnectionString").ConnectionString
Dim nCon As New SqlConnection(connStr)
Dim addCon As New SqlConnection(connStr)
Dim addCom As New SqlCommand("SELECT * FROM [News] WHERE ([ID] = @ID)", addCon)
addCom.Parameters.AddWithValue("@ID", ID)
addCon.Open()
addCom.ExecuteNonQuery()
Dim results As SqlDataReader
results = addCom.ExecuteReader
While results.Read()
Dim editText As String = results.Item("Content")
Dim Subject As String = results.Item("Subject")
editEditor.Text = editText
subjectTXT.Text = Subject
End While
End If
End Sub
从哪里获得ID值? addCom.Parameters。AddWithValue@ID,ID 删除addCom.ExecuteNonQuery 为什么使用 Dim editText作为字符串=results.ItemContent 我在循环之前定义变量,然后以这种方式读取它
Dim editText As String
While results.Read()
editText = results("Content") ' without .items
...
End While
删除addCom.executenonquery数据库字段中是否有空数据?