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Refresh 方法示例 （VBScript）

  • 项目

重要

从 Windows 8 和 Windows Server 2012 开始，RDS 服务器组件不再包含在 Windows 操作系统中（有关详细信息，请参阅 Windows 8 和 Windows Server 2012 兼容性指南）。 RDS 客户端组件将在将来的 Windows 版本中删除。 避免在新开发工作中使用此功能，并计划修改当前使用此功能的应用程序。 使用 RDS 的应用程序应迁移到 WCF 数据服务。

以下示例演示如何设置 RDS 的必要参数。运行时 DataControl。 使用 Refresh 方法检索 记录集 的方式由 ExecuteOptions 的设置和 FetchOptions 属性的设置决定。 若要测试此示例，请将以下代码剪切并粘贴到普通 ASP 文档中，并将其命名为 RefreshVBS.asp。 使用 查找 查找文件 Adovbs.inc 并将其放置在计划使用的目录中。 ASP 脚本将标识服务器。

<!-- BeginRefreshVBS -->  
<%@ Language=VBScript %>  
<!--use the following META tag instead of adovbs.inc-->  
<!--METADATA TYPE="typelib" uuid="00000205-0000-0010-8000-00AA006D2EA4" -->  
<html>  
<head>  
    <meta name="VI60_DefaultClientScript"  content=VBScript>  
    <meta name="GENERATOR" content="Microsoft Visual Studio 6.0">  
    <title>Refresh Method Example (VBScript)</title>  
<style>  
<!--  
body {  
   font-family: 'Verdana','Arial','Helvetica',sans-serif;  
   BACKGROUND-COLOR:white;  
   COLOR:black;  
    }  
.thead {  
   background-color: #008080;   
   font-family: 'Verdana','Arial','Helvetica',sans-serif;   
   font-size: x-small;  
   color: white;  
   }  
.thead2 {  
   background-color: #800000;   
   font-family: 'Verdana','Arial','Helvetica',sans-serif;   
   font-size: x-small;  
   color: white;  
   }  
.tbody {   
   text-align: center;  
   background-color: #f7efde;  
   font-family: 'Verdana','Arial','Helvetica',sans-serif;   
   font-size: x-small;  
    }  
-->  
</style>  
</head>  
  
<body>  
<h1>Refresh Method Example (VBScript)</h1>  
  
<H2>RDS API Code Examples </H2>  
<HR>  
<TABLE DATASRC=#RDC>  
   <TR>  
      <TD> <INPUT DATAFLD="FirstName" SIZE=15> </TD>  
      <TD> <INPUT DATAFLD="LastName" SIZE=15> </TD>  
      <TD> <INPUT DATAFLD="Title" SIZE=15> </TD>  
      <TD> <INPUT DATAFLD="HireDate" SIZE=15> </TD>  
   </TR>  
</TABLE>  
  
<!-- RDS.DataControl with no parameters set at design time -->  
<OBJECT classid="clsid:BD96C556-65A3-11D0-983A-00C04FC29E33"  
   ID=RDC HEIGHT=1 WIDTH=1>  
</OBJECT>  
<HR>  
Server: <Input Size=70 Name="txtServer" Value="https://<%=Request.ServerVariables("SERVER_NAME")%>"><BR>  
Connect: <Input Size=70 Name="txtConnect" Value="Provider='sqloledb';Integrated Security='SSPI';Initial Catalog='Northwind'"><BR>  
SQL: <Input Size=70 Name="txtSQL" Value="Select * from Employees">  
<HR>  
<TABLE BORDER=1 WIDTH="60%">  
<TR>  
   <TD COLSPAN=3 BGCOLOR=silver>  
   Choose if you want the Recordset brought back Synchronously on the   
   current calling thread or Asynchronously on another thread.   
   </TD>  
</TR>  
<TR>  
   <TD>Synchronously: <BR>  
      <Input Type="Radio" Name="optExecuteOptions" Checked OnClick="SetExO('adcExecSync')">  
   </TD>  
   <TD>Asynchronously: <BR>  
      <Input Type="Radio" Name="optExecuteOptions"  OnClick="SetExO('adcExecAsync')">  
   </TD>  
   <TD> </TD>  
</TR>  
<TR>  
   <TD COLSPAN=3 BGCOLOR=silver>  
   Fetch Up Front, Background Fetch with Blocking or Background Fetch   
   without Blocking   
   </TD>  
<TR>  
   <TD>Up Front:<BR>  
       <Input Type="Radio" Name="optFetchOptions"  OnClick="SetFO('adcFetchUpFront')">  
   </TD>  
   <TD>Background w/ Blocking:<BR>  
       <Input Type="Radio" Name="optFetchOptions" Checked OnClick="SetFO('adcFetchBackground')">  
   </TD>  
   <TD>Background w/o Blocking:<BR>  
      <Input Type="Radio" Name="optFetchOptions"  OnClick="SetFO('adcFetchAsync')">  
   </TD>  
</TR>  
</TABLE>  
  
<INPUT TYPE=BUTTON NAME="Run" VALUE="Run"><BR>  
  
<Script Language="VBScript">  
<!--  
Dim EO         'ExecuteOptions  
Dim FO         'FetchOptions  
EO = "adcExecSync"   'Default value  
FO = "adcFetchBackground"   'Default value  
  
Sub SetExO(NewEO)  
   EO = NewEO  
End Sub  
  
Sub SetFO(NewFO)  
   FO = NewFO  
End Sub  
  
' Set parameters of RDS.DataControl at Run Time  
Sub Run_OnClick  
   RDC.Server = txtServer.Value  
   RDC.SQL = txtSQL.Value  
   RDC.Connect = txtConnect.Value  
   If EO = "adcExecSync" Then   'Determine which ExecuteOption chosen  
      RDC.ExecuteOptions = adcExecSync  
      MsgBox "Recordset brought in on current calling thread Synchronously"  
   Else  
      RDC.ExecuteOptions = adcExecAsync  
      MsgBox "Recordset brought in on another thread Asynchronously"  
   End If  
  
   If FO = "adcFetchBackground" Then      'Determine                 which FetchOption chosen  
      RDC.FetchOptions = adcFetchBackground  
      MsgBox "Control goes back to user after first batch of records returned"  
   ElseIf FO = " adcFetchUpFront" Then  
      RDC.FetchOptions = adcFetchUpFront  
      MsgBox "All records returned before control goes back to user"  
   Else  
      RDC.FetchOptions = adcFetchAsync  
      MsgBox "Control goes back to user immediately"  
   End If  
  
   RDC.Refresh  
End Sub  
-->  
</Script>  
  
</body>  
</html>  
<!-- EndRefreshVBS -->

另请参阅

DataControl 对象 （RDS）
ExecuteOptions 属性 （RDS）
FetchOptions 属性 （RDS）
Recordset 对象 （ADO）
Refresh 方法 （ADO）