Execute、Requery 和 Clear 方法示例 (VBScript)

项目
05/30/2023

此示例演示了从 Command 对象和 Connection 对象运行时的 Execute 方法。它还使用 Requery 方法检索 Recordset 中的当前数据，并使用 Clear 方法清除 Errors 集合的内容。要运行此过程，需要 ExecuteCommand 和 PrintOutput 过程。

在 Active Server Page (ASP) 中使用以下示例。若要查看此功能完整的示例，必须让数据源 AdvWorks.mdb（随 SDK 示例一起安装）位于 C:\Program Files\Microsoft Platform SDK\Samples\DataAccess\Rds\RDSTest\advworks.mdb 或编辑示例代码中的路径以反映此文件的实际位置。这是一个 Microsoft Access 数据库文件。

使用 Find 查找文件 Adovbs.inc 并将其放置在计划使用的目录中。将以下代码剪切并粘贴到记事本或其他文本编辑器中，并将其保存为 ExecuteVBS.asp。可以在任何客户端浏览器中查看结果。

<!-- BeginExecuteVBS -->  
<%@ Language=VBScript %>  
<% ' use this 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>ADO Execute Method</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>  
<H3>ADO Execute Method</H3>  
<HR>  
<H4>Recordset Retrieved Using Connection Object</H4>  
<!--- Recordsets retrieved using Execute method of Connection and Command Objects-->  
<%   
     ' connection, command and recordset variables  
    Dim Cnxn, strCnxn  
    Dim rsCustomers, strSQLCustomers  
    Dim Cmd   
    Dim rsProducts, strSQLProducts  
  
    ' create and open connection  
    Set Cnxn = Server.CreateObject("ADODB.Connection")   
    strCnxn="Provider='sqloledb';Data Source=" & _  
            Request.ServerVariables("SERVER_NAME") & ";" & _  
            "Integrated Security='SSPI';Initial Catalog='Northwind';"  
    Cnxn.Open  strCnxn  
    ' create and open recordset  
    Set rsCustomers = Server.CreateObject("ADODB.Recordset")  
    strSQLCustomers = "Customers"  
    rsCustomers.Open strSQLCustomers, Cnxn, adOpenKeyset, adLockOptimistic, adCmdTable  
  
    '1st Recordset using Connection - Execute  
    Set rsCustomers = Cnxn.Execute(strSQLCustomers)   
  
    Set Cmd = Server.CreateObject("ADODB.Command")  
    Cmd.ActiveConnection = Cnxn  
    strSQLProducts = "SELECT * From Products"  
    Cmd.CommandText = strSQLProducts  
  
    '2nd Recordset Cmd - execute   
    Set rsProducts = Cmd.Execute  
    %>  
    <TABLE COLSPAN=8 CELLPADDING=5 BORDER=0 ALIGN=CENTER>  
    <!-- BEGIN column header row for Customer Table-->  
    <TR CLASS=thead>  
      <TH>Company Name</TH>  
      <TH>Contact Name</TH>  
      <TH>City</TH>  
    </TR>  
  
    <!--Display ADO Data from Customer Table-->  
    <%   
    Do While Not rsCustomers.EOF %>  
      <TR CLASS=tbody>  
        <TD>   
        <%= rsCustomers("CompanyName")%>   
        </TD>  
        <TD>  
        <%= rsCustomers("ContactName") %>   
        </TD>  
        <TD>   
        <%= rsCustomers("City")%>   
        </TD>  
      </TR>   
      <%   
    rsCustomers.MoveNext   
    Loop   
    %>  
</TABLE>  
  
<HR>  
<H4>Recordset Retrieved Using Command Object</H4>  
  
<TABLE CELLPADDING=5 BORDER=0 ALIGN=CENTER WIDTH="80%">  
  
<!-- BEGIN column header row for Product List Table-->  
<TR CLASS=thead2>  
  <TH>Product Name</TH>  
  <TH>Unit Price</TH>  
</TR>  
  
<!-- Display ADO Data Product List-->  
<% Do Until rsProducts.EOF %>  
  <TR CLASS=tbody>  
    <TD>  
    <%= rsProducts("ProductName")%>    
    </TD>  
    <TD>   
    <%= rsProducts("UnitPrice")%>   
    </TD>  
<%   
    rsProducts.MoveNext   
    Loop  
  
    ' clean up  
    If rsCustomers.State = adStateOpen then  
        rsCustomers.Close  
    End If  
    If rsProducts.State = adStateOpen then  
        rsProducts.Close  
    End If  
    If Cnxn.State = adStateOpen then  
        Cnxn.Close  
    End If  
    Set Cmd = Nothing  
    Set rsCustomers = Nothing  
    Set rsProducts = Nothing  
    Set Cnxn = Nothing  
%>  
</TABLE>  
  
</BODY>  
</HTML>  
<!-- EndExecuteVBS -->

另请参阅

Clear 方法 (ADO)
命令对象 (ADO)
连接对象 (ADO)
错误对象
 错误集合 (ADO)
Execute 方法（ADO 命令）
Execute 方法（ADO 连接）
记录集对象 (ADO)
Requery 方法

通过

Execute、Requery 和 Clear 方法示例 (VBScript)

另请参阅

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