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cellspacing="1" cellpadding="1" bgcolor="#000000"><tr bgcolor="#FFFFFF"><td width="100%" colspan="4" align="left"><table width="95%" align="center"><tr><td class="font1"><p align="center"><br><font size="3">精简DELPHI数据库系统的补充</font><br><span class="nava"><font color="#CC9933">2000-05-29· -·-</font></span></p><p align="JUSTIFY"> 在网上看到一篇文章《精简DELPHI数据库系统》，本人依实际操作经验，觉得其文小有疏漏，有必要在此加以补充。<o:p></o:p><br> <o:p></o:p> 大家都知道，用DELPHI做数据库虽然方便，但发布时必需同时分发BDE(Borland公司的32位数据库引擎)，全部文件需17兆之巨，如此怎么还能彰显DELPHI的优越性呢？！所以程序员在用DELPHI做数据库时，如何根据实际情况精简BDE是必不可少的一步。<o:p></o:p></p> <p class="MsoNormal" style="TEXT-INDENT: 14.2pt; tab-stops: 28.4pt"> BDE中各文件的具体作用，可以参考BDE32.HELP中Introduction to Borland Database Engine/Core BDE files 在此只以我作的一个数据库为例谈谈精简BDE的具体步骤。<o:p></o:p></p> <p class="MsoNormal" style="TEXT-INDENT: 14.2pt; tab-stops: 28.4pt"> 程序使用PARADOX数据库,用到了TQUERY和TBACHMOVE控件,BDE文件如下：<o:p></o:p></p> <blockquote> <p>blw32.dll 国际语言驱动支持,必需<o:p></o:p></p> <p>Bantam.dll 未查到相关解释，缺少会引起BDE初始化错误<o:p></o:p></p> <p>idapi32.dll 数据驱动基本函数集,必需<o:p></o:p></p> <p>fareast.btl 东方语言驱动程序,使用中文必需<o:p></o:p></p> <p>idr20009.dll 错误信息,必需<o:p></o:p></p> <p>charset.cvb 字符集转换,如用到CHARSET_GB2312,则必不可少<o:p></o:p></p> <p>idbat32.dll 批量移动数据支持(针对TBATHMOVE控件)<o:p></o:p></p> <p>idpdx32.dll PARADOX数据库驱动程序<o:p></o:p></p> <p>idsql32.dll SQL查询引擎(针对TQUERY控件)<o:p></o:p></p> <p>IDAPI.CFG BDE配置文件,存储数据库别名,必不可少<o:p></o:p></p> </blockquote> <p class="MsoNormal" style="TEXT-INDENT: 14.2pt; tab-stops: 28.4pt"> 共10个文件,2.3M,ZIP后830K,以前用VFP需要3张软盘的桌面数据库,现在一盘搞定.<o:p></o:p></p> <p class="MsoNormal" style="TEXT-INDENT: 14.2pt; tab-stops: 28.4pt"> 除了拷贝BDE文件外，还要对系统进行一些设置工作，具体程序如下:<o:p></o:p></p> <blockquote> <p>procedure TForm1.FormCreate(Sender: TObject);<o:p></o:p></p> <p> var stl:tstringlist; <o:p></o:p></p> <p> myrg:tregistry; <o:p></o:p></p> <p> i:integer;<o:p></o:p></p> <p> path:string;<o:p></o:p></p> <p> begin<o:p></o:p></p> <blockquote> <p> path:=extractfilepath(application.ExeName); //获得当前路径；<o:p></o:p></p> <p> stl:=tstringlist.Create ;<o:p></o:p></p> <p> myrg:=tregistry.Create;<o:p></o:p></p> <p> myrg.RootKey :=HKEY_LOCAL_MACHINE;<o:p></o:p></p> </blockquote> <p> try<o:p></o:p></p> <p> IF NOT myrg.KeyExists('software\Borland') then </p> <blockquote> <p>begin //检查相应键值<o:p></o:p>以确定BDE是否注册/当前数据库程序是否初次运行；<o:p></o:p></p> <blockquote> <p> showmessage('初次使用,系统将进行必要设置!');<o:p></o:p></p> <p> myrg.OpenKey('software\Borland\Database Engine',true);<o:p></o:p></p>⌨️ 快捷键说明
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