📄 mdprostatex.htm

📁 ADO使用手册,非常详细
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<h3><a name="mdprostatex"></a>State 属性范例</h3>
<p>
该范例使用 <b>State</b> 属性，在异步连接正在打开和异步命令正在执行时显示消息。</p>
<pre>Public Sub StateX()   Dim cnn1 As ADODB.Connection
   Dim cnn2 As ADODB.Connection
   Dim cmdChange As ADODB.Command
   Dim cmdRestore As ADODB.Command
   Dim strCnn As String
   
   ' 打开两个异步连接，在连接时显示消息。
   Set cnn1 = New ADODB.Connection
   Set cnn2 = New ADODB.Connection
   strCnn = "Provider=sqloledb;" &amp; _
      "Data Source=srv;Initial Catalog=pubs;User Id=sa;Password=; "
      
   cnn1.Open strCnn, , , adAsyncConnect
   While (cnn1.<span class=cfe><b>State</b></span> = adStateConnecting)
      Debug.Print "Opening first connection...."
   Wend
   
   cnn2.Open strCnn, , , adAsyncConnect
   While (cnn2.<span class=cfe><b>State</b></span> = adStateConnecting)
      Debug.Print "Opening second connection...."
   Wend
   
   ' 创建两个命令对象。
   Set cmdChange = New ADODB.Command
   cmdChange.ActiveConnection = cnn1
   cmdChange.CommandText = "UPDATE titles SET type = 'self_help' " &amp; _
      "WHERE type = 'psychology'"
   
   Set cmdRestore = New ADODB.Command
   cmdRestore.ActiveConnection = cnn2
   cmdRestore.CommandText = "UPDATE titles SET type = 'psychology' " &amp; _
      "WHERE type = 'self_help'"
   
   ' 执行命令，在正在执行时显示消息。
   cmdChange.Execute , , adAsyncExecute
   While (cmdChange.<span class=cfe><b>State</b></span> = adStateExecuting)
      Debug.Print "Change command executing...."
   Wend
   
   cmdRestore.Execute , , adAsyncExecute
   While (cmdRestore.<span class=cfe><b>State</b></span> = adStateExecuting)
      Debug.Print "Restore command executing...."
   Wend
   
   cnn1.Close
   cnn2.CloseEnd Sub</pre>
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