ADO 更新記錄

我們可使用 SQL 的 UPDATE 來更新數據庫表中的某條記錄。

更新數據庫表中的記錄

我們希望更新 Northwind 數據中 Customers 表的某條記錄。首先我們需要創建一個表格,來列出 Customers 中的所有記錄。

<html>
<body>
<%
set conn=Server.CreateObject("ADODB.Connection")
conn.Provider="Microsoft.Jet.OLEDB.4.0"
conn.Open "c:/webdata/northwind.mdb"
set rs=Server.CreateObject("ADODB.Recordset")
rs.open "SELECT * FROM customers",conn
%>

<h2>List Database</h2>
<table border="1" width="100%">
<tr>
<%
for each x in rs.Fields
  response.write("<th>" & ucase(x.name) & "</th>")
next
%>
</tr>
<% do until rs.EOF %>
<tr>
<form method="post" action="demo_update.asp">
<%
for each x in rs.Fields
  if lcase(x.name)="customerid" then%>
    <td>
    <input type="submit" name="customerID" value="<%=x.value%>">
    </td>
  <%else%>
    <td><%Response.Write(x.value)%></td>
  <%end if
next
%>
</form>
<%rs.MoveNext%>
</tr>
<%
loop
conn.close
%>
</table>

</body>
</html>

如果用戶點擊 "customerID" 列中的按鈕,會打開一個新文件 "demo_update.asp"。此文件包含了創建輸入域的源代碼,這些輸入域基于數據庫中記錄的字段,同時也含有一個保存修改的“更新按鈕”:

<html>
<body>

<h2>Update Record</h2>
<%
set conn=Server.CreateObject("ADODB.Connection")
conn.Provider="Microsoft.Jet.OLEDB.4.0"
conn.Open "c:/webdata/northwind.mdb"

cid=Request.Form("customerID")

if Request.form("companyname")="" then
  set rs=Server.CreateObject("ADODB.Recordset")
  rs.open "SELECT * FROM customers WHERE customerID='" & cid & "'",conn
  %>
  <form method="post" action="demo_update.asp">
  <table>
  <%for each x in rs.Fields%>
  <tr>
  <td><%=x.name%></td>
  <td><input name="<%=x.name%>" value="<%=x.value%>"></td>
  <%next%>
  </tr>
  </table>
  <br /><br />
  <input type="submit" value="Update record">
  </form>
<%
else
  sql="UPDATE customers SET "
  sql=sql & "companyname='" & Request.Form("companyname") & "',"
  sql=sql & "contactname='" & Request.Form("contactname") & "',"
  sql=sql & "address='" & Request.Form("address") & "',"
  sql=sql & "city='" & Request.Form("city") & "',"
  sql=sql & "postalcode='" & Request.Form("postalcode") & "',"
  sql=sql & "country='" & Request.Form("country") & "'"
  sql=sql & " WHERE customerID='" & cid & "'"
  on error resume next
  conn.Execute sql
  if err<>0 then
    response.write("No update permissions!")
  else 
    response.write("Record " & cid & " was updated!")
  end if 
end if
conn.close
%>

</body>
</html>
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