📄 mdmthrefreshvbs.htm

📁 ADO使用手册,非常详细
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<META HTTP-EQUIV="Content-Type" Content="text/html; charset=gb2312"><title>Refresh 方法范例 (VBScript)</title>
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<h3><a name="mdmthrefreshvbs"></a>Refresh 方法范例 (VBScript)</h3>
<p>
以下范例举例说明如何在运行时设置必要的 <b>RDS.DataControl</b> 参数。使用 <b>Refresh</b> 方法检索 <b>Recordset</b> 的方式取决于 <b>ExecuteOptions</b> 和 <b>FetchOptions</b> 属性的设置。如要测试该范例，请剪切该代码并粘贴至规范的 HTML 文本的 &lt;Body&gt;&lt;/Body&gt; 标记之间，并将其命名为“ADCapi2.asp”。ASP 脚本将标识服务器。</p>
<pre>&lt;HTML&gt;
&lt;HEAD&gt;
&lt;TITLE&gt;Refresh / ExecuteOptions&lt;/TITLE&gt;
&lt;/HEAD&gt;
&lt;BODY&gt;
&lt;Center&gt;&lt;H2&gt;RDS API Code Examples &lt;/H2&gt;
&lt;HR&gt;
&lt;Object CLASSID="clsid:AC05DC80-7DF1-11d0-839E-00A024A94B3A"
   CODEBASE="http://&lt;%=Request.ServerVariables("SERVER_NAME")%&gt;/MSADC/Samples/Sheridan.cab"
   ID=GRID1 
      datasrc=#ADC
      HEIGHT=125 
      WIDTH=495&gt;
   &lt;PARAM NAME="AllowAddNew" VALUE="TRUE"&gt;
   &lt;PARAM NAME="AllowDelete" VALUE="TRUE"&gt;
   &lt;PARAM NAME="AllowUpdate" VALUE="TRUE"&gt;
   &lt;PARAM NAME="Caption" VALUE="Remote Data Service Run Time"&gt;
&lt;/OBJECT&gt;&lt;!-- 在设计时设置的不带参数的 RDS.DataControl --&gt;
&lt;OBJECT classid="clsid:BD96C556-65A3-11D0-983A-00C04FC29E33"
   ID=ADC&gt;
   &lt;/OBJECT&gt;
&lt;HR&gt;
&lt;Input Size=70 Name="txtServer" Value="http://&lt;%=Request.ServerVariables("SERVER_NAME")%&gt;"&gt;&lt;BR&gt;
&lt;Input Size=70 Name="txtConnect" Value = "dsn=ADCDemo;UID=ADCDemo;PWD=ADCDemo;"&gt;&lt;BR&gt;
&lt;Input Size=70 Name="txtSQL" Value="Select * from Employee"&gt;
&lt;BR&gt;
Choose if you want the Recordset brought back Synchronously on the current calling thread or Asynchronously on another thread
&lt;Input Type="Radio" Name="optExecuteOptions" Checked OnClick="SetExO('adcExecSync')"&gt;
&lt;Input Type="Radio" Name="optExecuteOptions"&nbsp; OnClick="SetExO('adcExecAsync')"&gt;&lt;BR&gt;
Fetch Up Front, Background Fetch with Blocking or Background Fetch without Blocking
&lt;Input Type="Radio" Name="optFetchOptions"&nbsp; OnClick="SetFO('adcFetchUpFront')"&gt;
&lt;Input Type="Radio" Name="optFetchOptions" Checked OnClick="SetFO('adcFetchBackground')"&gt;
&lt;Input Type="Radio" Name="optFetchOptions"&nbsp; OnClick="SetFO('adcFetchAsync')"&gt;
&lt;HR&gt;
&lt;INPUT TYPE=BUTTON NAME="Run" VALUE="Run"&gt;&lt;BR&gt;
&lt;H4&gt;Fill Grid with these values or change them to see data from another ODBC data source on your server&lt;/H4&gt;
&lt;/Center&gt;
&lt;Script Language="VBScript"&gt;
&lt;!--
Dim EO          'ExecuteOptions
Dim FO         'FetchOptions
EO = "adcExecSync"   ' 默认值
FO = "adcFetchBackground"   ' 默认值
Sub SetExO(NewEO)
   EO = NewEO
End Sub
Sub SetFO(NewFO)
   FO = NewFO
End Sub
' 在运行时设置 RDS.DataControl 参数。
Sub Run_OnClick
   ADC.Server = txtServer.Value
   ADC.SQL = txtSQL.Value
   ADC.Connect = txtConnect.Value
If EO = "adcExecSync" Then      ' 选择 ExecuteOption
   ADC.ExecuteOptions = adcExecSync
      MsgBox "Recordset brought in on current calling thread Syncronously"
Else
   ADC.ExecuteOptions = adcExecAsync
         MsgBox "Recordset brought in on another thread Asyncronously"
End IfIf FO = "adcFetchBackground" Then      ' 选择 FetchOption
   ADC.FetchOptions = adcFetchBackground
      MsgBox "Control goes back to user after first batch of records returned"
ElseIf FO = " adcFetchUpFront" Then
   ADC.FetchOptions = adcFetchUpFront
         MsgBox "All records returned before control goes back to user"
Else
   ADC.FetchOptions = adcFetchAsync
         MsgBox "Control goes back to user immediately"
End IfADC.RefreshEnd Sub
--&gt;
&lt;/Script&gt;
&lt;/BODY&gt;
&lt;/HTML&gt;
</pre>
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