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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="85.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 (7) <br>

发信站: BBS 水木清华站 (Thu Nov 12 21:55:54 1998) WWW-POST <br>

  <br>

* * * Begin Note * * * <br>

  <br>

Note: You naturally have a choice as to how much logic you put on the middle <br>

tier; that is, the server part of your applications. For instance, it is your <br>

choice as to whether or not to arrange the tables in a one-to-many on the <br>

server, though in most cases you would not do this. If you do this, then when <br>

you query the server from the client, you will get only the records from the <br>

detail table that are currently visible on the server. This may, in fact, be <br>

exactly what you want, particularly if the detail table is large. However, if <br>

both the master and detail table are small, then you may prefer to access all <br>

records from both tables, which is best accomplished by leaving them in their <br>

raw form on the server, and hooking them together in a master detail <br>

relationship only on the client. Even if you do not connect them in a one to <br>

many on the server, you still have the ability to control how many records <br>

come over at one time, so there really is no particular advantage to setting <br>

up a one-to-many on the server. <br>

  <br>

Borland may place additional code on its Web site (www.borland.com), that <br>

will aid in placing more logic on applications servers, even when using the <br>



first version of MIDAS. <br>

  <br>

  <br>

  <br>

* * * End Note * * * <br>

  <br>

  <br>

-- <br>

※ 来源:·BBS 水木清华站 bbs.net.tsinghua.edu.cn·[FROM: 202.38.72.60] <br>

</small><hr>
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