用ASP.net加ACCESS的网页，都用ADO.net操作的，存在一个问题：文本框修改后存入数据库无法Update。网页的具体步骤：
Page_Load中，连接数据库，建立了一个Reader，读出表中的字段，其中WHERE用的是等于Request地址栏的id参数。读出以后给文本框绑定值，然后关闭了Reader，关闭连接。
然后用户会开始修改文本框的内容，改好后按btn_Submit。
btn_Submit_Click中，将文本框内容存入变量，连接数据库，用Command弄一个Update，Update除了id的每个字段，最后用Excute执行，没有报错，就是无法更改内容。
在另一张网页，对同一张数据表进行Insert操作就能，是不是证明数据库是可写的。具体代码如下
Imports System.Data.OleDb
Imports System.IOPartial Class News_ManageDetail
Inherits System.Web.UI.Page Public ori_title As String
Public ori_article As String Protected Sub btn_Submit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btn_Submit.Click
'定义变量
Dim ar_title As String = txt_title.Text
Dim ar_time As String = lb_NewsTime.Text
Dim ar_auid As String = Session("UserID")
Dim ar_attpath As String = ""
Dim ar_attname As String = ""
Dim ar_auname As String = lb_AuthorName.Text
Dim ar_article As String = txt_Article.Text
'判断文件以及操作文件
If txt_attname.Text <> "" And FileUpload1.HasFile = False Then
'如果没有上传文件则警告
lb_alert.Text = "您没有上传文件。"
lb_alert.Visible = True
Return
End If
If FileUpload1.HasFile Then
'如果没有输入文件名则警告
If txt_attname.Text = "" Then
lb_alert.Text = "您需要输入上传后的重命名名称。"
lb_alert.Visible = True
Return
End If
'如果超过大小则警告
If FileUpload1.PostedFile.ContentLength > 4 * 1024 * 1024 Then
lb_alert.Text = "您上传的文件大小过大，最大只能为4M。您上传的文件大小为 " & FileUpload1.PostedFile.ContentLength / 1024 / 1024 & " M。"
lb_alert.Visible = True
Return
End If
'如果类型不对则警告
Dim extension As String = Path.GetExtension(FileUpload1.PostedFile.FileName.ToLower)
If extension <> ".txt" And extension <> ".doc" And extension <> ".xls" And extension <> ".docx" And extension <> ".xlsx" And extension <> ".ppt" And extension <> ".pptx" And extension <> ".pdf" And extension <> ".pdf" Then
lb_alert.Text = "您的文件类型不对，文件类型只能为： txt doc xls docx xlsx ppt pptx pdf rar 。"
lb_alert.Visible = True
Return
End If
'如果没问题，很好~
ar_attpath = txt_attname.Text & extension
ar_attname = txt_attname.Text
End If
'上传文件
If txt_attname.Text <> "" And FileUpload1.HasFile <> False Then
Try
Using connection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath("~\App_Data\StudentCredits.mdb") & ";Persist Security Info=True;Jet OLEDB:Database Password=unncspdpo123")
connection.Open()
Dim command_findfile As OleDbCommand = New OleDbCommand("SELECT AttPath FROM tb_News WHERE (NewsID = @Newsid)", connection)
command_findfile.Parameters.AddWithValue("@Newsid", Request.QueryString("newsid"))
Dim reader As OleDbDataReader = command_findfile.ExecuteReader()
reader.Read()
Dim ori_attpath As String = reader.GetValue(reader.GetOrdinal("AttPath")).ToString
reader.Close()
connection.Close()
'删除原文件
File.Delete(MapPath("~/UploadFiles/" & ori_attpath))
End Using
'添加新文件
FileUpload1.SaveAs(MapPath("~/UploadFiles/" & ar_attpath))
Catch ex As Exception
lb_alert.Text = "上传失败，可能是文件名已存在，或者磁盘空间不足，请尝试更改文件名。"
Return
End Try
End If
'更新数据
Using connection2 As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath("~\App_Data\StudentCredits.mdb") & ";Persist Security Info=True;Jet OLEDB:Database Password=unncspdpo123")
'更新数据库
connection2.Open()
Dim command_update As OleDbCommand = New OleDbCommand _
("UPDATE tb_News SET tb_News.Title=@Title, tb_News.AuthorID=@AuthorID, tb_News.NewsTime=@NewsTime, tb_News.AttPath=@AttPath, tb_News.AttName=@AttName, tb_News.Article =@Article WHERE tb_News.NewsID =@NewsID", connection2)
command_update.Parameters.AddWithValue("@Newsid", Request.QueryString("newsid"))
command_update.Parameters.AddWithValue("@Title", ar_title)
command_update.Parameters.AddWithValue("@AuthorID", ar_auid)
command_update.Parameters.AddWithValue("@NewsTime", ar_time)
command_update.Parameters.AddWithValue("@Article", ar_article)
If txt_attname.Text <> "" And FileUpload1.HasFile <> False Then
command_update.Parameters.AddWithValue("@AttPath", ar_attpath)
command_update.Parameters.AddWithValue("@AttName", ar_attname)
Else
command_update.Parameters.AddWithValue("@AttPath", "")
command_update.Parameters.AddWithValue("@AttName", "")
End If
command_update.ExecuteNonQuery()
connection2.Close()
End Using
'反馈信息
'Response.Write(<script language='javascript'>alert('修改成功！');location='News_ManageIndex.aspx';</script>)
Response.Write(Request.QueryString("newsid") & "<br />")
Response.Write(ar_title & "<br />")
End Sub Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'判断是否符合权限
If Session("Privilege") <> "admin" And Session("Privilege") <> "spdpof" Then
Response.Write(<script language='javascript'>alert('您的权限不允许访问此界面！');location='Default.aspx';</script>)
End If
'设置警告字符
lb_alert.Text = "仅在需要更新附件时再向文本框内输入文件名。"
lb_alert.Visible = True
'设置默认按钮
Me.Form.DefaultButton = "cp_main$btn_Submit"
'填入数据库内容
Using connection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath("~\App_Data\StudentCredits.mdb") & ";Persist Security Info=True;Jet OLEDB:Database Password=unncspdpo123")
connection.Open()
Dim command_find As OleDbCommand = New OleDbCommand("SELECT Title, Article FROM tb_News WHERE (NewsID = @Newsid)", connection)
command_find.Parameters.AddWithValue("@Newsid", Request.QueryString("newsid"))
Dim reader As OleDbDataReader = command_find.ExecuteReader()
'在页面写入数据库内容
reader.Read()
ori_title = reader.GetValue(reader.GetOrdinal("Title")).ToString
ori_article = reader.GetValue(reader.GetOrdinal("Article")).ToString
reader.Close()
'关闭数据库
connection.Close()
End Using
txt_title.Text = ori_title
lb_NewsTime.Text = DateTime.Now.ToString()
lb_AuthorName.Text = Session("ChnName")
txt_attname.Text = ""
txt_Article.Text = ori_article
End SubEnd Class
Page_Load中，连接数据库，建立了一个Reader，读出表中的字段，其中WHERE用的是等于Request地址栏的id参数。读出以后给文本框绑定值，然后关闭了Reader，关闭连接。
然后用户会开始修改文本框的内容，改好后按btn_Submit。
btn_Submit_Click中，将文本框内容存入变量，连接数据库，用Command弄一个Update，Update除了id的每个字段，最后用Excute执行，没有报错，就是无法更改内容。
在另一张网页，对同一张数据表进行Insert操作就能，是不是证明数据库是可写的。具体代码如下
Imports System.Data.OleDb
Imports System.IOPartial Class News_ManageDetail
Inherits System.Web.UI.Page Public ori_title As String
Public ori_article As String Protected Sub btn_Submit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btn_Submit.Click
'定义变量
Dim ar_title As String = txt_title.Text
Dim ar_time As String = lb_NewsTime.Text
Dim ar_auid As String = Session("UserID")
Dim ar_attpath As String = ""
Dim ar_attname As String = ""
Dim ar_auname As String = lb_AuthorName.Text
Dim ar_article As String = txt_Article.Text
'判断文件以及操作文件
If txt_attname.Text <> "" And FileUpload1.HasFile = False Then
'如果没有上传文件则警告
lb_alert.Text = "您没有上传文件。"
lb_alert.Visible = True
Return
End If
If FileUpload1.HasFile Then
'如果没有输入文件名则警告
If txt_attname.Text = "" Then
lb_alert.Text = "您需要输入上传后的重命名名称。"
lb_alert.Visible = True
Return
End If
'如果超过大小则警告
If FileUpload1.PostedFile.ContentLength > 4 * 1024 * 1024 Then
lb_alert.Text = "您上传的文件大小过大，最大只能为4M。您上传的文件大小为 " & FileUpload1.PostedFile.ContentLength / 1024 / 1024 & " M。"
lb_alert.Visible = True
Return
End If
'如果类型不对则警告
Dim extension As String = Path.GetExtension(FileUpload1.PostedFile.FileName.ToLower)
If extension <> ".txt" And extension <> ".doc" And extension <> ".xls" And extension <> ".docx" And extension <> ".xlsx" And extension <> ".ppt" And extension <> ".pptx" And extension <> ".pdf" And extension <> ".pdf" Then
lb_alert.Text = "您的文件类型不对，文件类型只能为： txt doc xls docx xlsx ppt pptx pdf rar 。"
lb_alert.Visible = True
Return
End If
'如果没问题，很好~
ar_attpath = txt_attname.Text & extension
ar_attname = txt_attname.Text
End If
'上传文件
If txt_attname.Text <> "" And FileUpload1.HasFile <> False Then
Try
Using connection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath("~\App_Data\StudentCredits.mdb") & ";Persist Security Info=True;Jet OLEDB:Database Password=unncspdpo123")
connection.Open()
Dim command_findfile As OleDbCommand = New OleDbCommand("SELECT AttPath FROM tb_News WHERE (NewsID = @Newsid)", connection)
command_findfile.Parameters.AddWithValue("@Newsid", Request.QueryString("newsid"))
Dim reader As OleDbDataReader = command_findfile.ExecuteReader()
reader.Read()
Dim ori_attpath As String = reader.GetValue(reader.GetOrdinal("AttPath")).ToString
reader.Close()
connection.Close()
'删除原文件
File.Delete(MapPath("~/UploadFiles/" & ori_attpath))
End Using
'添加新文件
FileUpload1.SaveAs(MapPath("~/UploadFiles/" & ar_attpath))
Catch ex As Exception
lb_alert.Text = "上传失败，可能是文件名已存在，或者磁盘空间不足，请尝试更改文件名。"
Return
End Try
End If
'更新数据
Using connection2 As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath("~\App_Data\StudentCredits.mdb") & ";Persist Security Info=True;Jet OLEDB:Database Password=unncspdpo123")
'更新数据库
connection2.Open()
Dim command_update As OleDbCommand = New OleDbCommand _
("UPDATE tb_News SET tb_News.Title=@Title, tb_News.AuthorID=@AuthorID, tb_News.NewsTime=@NewsTime, tb_News.AttPath=@AttPath, tb_News.AttName=@AttName, tb_News.Article =@Article WHERE tb_News.NewsID =@NewsID", connection2)
command_update.Parameters.AddWithValue("@Newsid", Request.QueryString("newsid"))
command_update.Parameters.AddWithValue("@Title", ar_title)
command_update.Parameters.AddWithValue("@AuthorID", ar_auid)
command_update.Parameters.AddWithValue("@NewsTime", ar_time)
command_update.Parameters.AddWithValue("@Article", ar_article)
If txt_attname.Text <> "" And FileUpload1.HasFile <> False Then
command_update.Parameters.AddWithValue("@AttPath", ar_attpath)
command_update.Parameters.AddWithValue("@AttName", ar_attname)
Else
command_update.Parameters.AddWithValue("@AttPath", "")
command_update.Parameters.AddWithValue("@AttName", "")
End If
command_update.ExecuteNonQuery()
connection2.Close()
End Using
'反馈信息
'Response.Write(<script language='javascript'>alert('修改成功！');location='News_ManageIndex.aspx';</script>)
Response.Write(Request.QueryString("newsid") & "<br />")
Response.Write(ar_title & "<br />")
End Sub Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'判断是否符合权限
If Session("Privilege") <> "admin" And Session("Privilege") <> "spdpof" Then
Response.Write(<script language='javascript'>alert('您的权限不允许访问此界面！');location='Default.aspx';</script>)
End If
'设置警告字符
lb_alert.Text = "仅在需要更新附件时再向文本框内输入文件名。"
lb_alert.Visible = True
'设置默认按钮
Me.Form.DefaultButton = "cp_main$btn_Submit"
'填入数据库内容
Using connection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath("~\App_Data\StudentCredits.mdb") & ";Persist Security Info=True;Jet OLEDB:Database Password=unncspdpo123")
connection.Open()
Dim command_find As OleDbCommand = New OleDbCommand("SELECT Title, Article FROM tb_News WHERE (NewsID = @Newsid)", connection)
command_find.Parameters.AddWithValue("@Newsid", Request.QueryString("newsid"))
Dim reader As OleDbDataReader = command_find.ExecuteReader()
'在页面写入数据库内容
reader.Read()
ori_title = reader.GetValue(reader.GetOrdinal("Title")).ToString
ori_article = reader.GetValue(reader.GetOrdinal("Article")).ToString
reader.Close()
'关闭数据库
connection.Close()
End Using
txt_title.Text = ori_title
lb_NewsTime.Text = DateTime.Now.ToString()
lb_AuthorName.Text = Session("ChnName")
txt_attname.Text = ""
txt_Article.Text = ori_article
End SubEnd Class
解决方案 »
免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货