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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center">         Delphi编程                            (BM: strayli FlyingBoy)          </font></big></big></td></tr>
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<tr><td width="100%" colspan="2" height="454">　<p align="center">[<a href="index.htm">回到开始</a>][<a href="15.htm">上一层</a>][<a href="95.htm">下一篇</a>]
<hr><p align="left"><small>发信人: strayli (stray), 信区: Delphi <br>

标  题: A Technical View of Borland MIDAS Part II (10) <br>

发信站: BBS 水木清华站 (Thu Nov 12 22:27:06 1998) WWW-POST <br>

  <br>

Using OLEnterprise <br>

OLEnterprise is an alternative to DCOM. If you use OLEnterprise, then you do <br>

not need to have DCOM on your system. <br>

  <br>

OLEnterprise has several advantages over DCOM: <br>

  <br>

It will allow you to make connections between two Windows 95 machines, even <br>

if no NT server is available. Connections without a server is impossible <br>

under DCOM. Connections between two Windows 95 machines even when a server is <br>

present are either impossible or extremely problematic under DCOM. In <br>

particular, DCOM only seems to work reliably when you are placing servers on <br>

NT machines. You can connect from a Windows 95 machine to an NT machine with <br>

DCOM, but not vice versa, nor can you reliably connect between two Windows 95 <br>

machines. (As far as I can tell it is impossible to place a server on a <br>

Windows 95 machine for remote connections, but I am hedging a bit here since <br>

this area is so poorly documented that I may have missed a trick hidden in <br>

some obscure location. Also, I suppose that this state of affairs will change <br>

as DCOM matures. At any rate, I have never spoken to any one who has made the <br>

connection successfully, though many very talented programmers have tried.) <br>



OLEnterprise has an Object Broker that will allow you to distribute the load <br>

of connections over multiple machines. In particular, each time a new user <br>

signs on to a database, they can be randomly routed to an available server, <br>

thereby distributing the load over multiple servers. The act of replicating <br>

the data between servers is, quite naturally, not supported by OLEnterprise, <br>

but is instead the responsibility of the server itself. <br>

OLEnterprise has fail over capability available through writing a few lines <br>

of code. <br>

Here is the fail over example, as provided by the good graces of the <br>

indefatigable Mike Destein: <br>

  <br>

procedure TForm1.Button2Click(Sender: TObject); <br>

  <br>

begin <br>

  <br>

try <br>

  <br>

ClientDataset1.ApplyUpdates(-1); <br>

  <br>

except <br>

  <br>

on eOle : EOleException do begin <br>

on eOle : EOleException do begin <br>

  <br>

Case eOle.Errorcode of <br>

  <br>

-2147023169 : // I dont know the const name <br>

  <br>

begin <br>

  <br>

// Handle RPC failure by resetting server <br>

  <br>

RemoteServer1.Connected := False; <br>

  <br>

RemoteServer1.connected := TRUE; <br>

  <br>

ClientDataset1.ApplyUpdates(-1); <br>

  <br>

end; <br>

  <br>

else showMessage(intToStr(eOle.errorCode)); <br>

  <br>

end; <br>

  <br>

end; <br>



  <br>

end; <br>

  <br>

end; <br>

  <br>

  <br>

  <br>

-- <br>

※ 来源:·BBS 水木清华站 bbs.net.tsinghua.edu.cn·[FROM: 202.38.79.111] <br>

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