今天重新安装Delphi后，发现以前的程序不能编译，错误提示为：File not found: 'DBAccess.dcu'，这个'DBAccess.dcu'j是什么东西呢？ 在网上查了一下，也没有找到，后来在我以前的控件包里仔细找了一下，发现'DBAccess.dcu'原来是ODAC控件里的一个文件，ODAC是一个让Delphi连接Oracle的三方组件，安装以后就可以了，看一下ODAC官方介绍吧，英文的，将就看。

Oracle Data Access Components (ODAC) is a library of components that provides native connectivity to Oracle from Delphi, Delphi for .NET, C++Builder and Kylix. The ODAC library is designed to help programmers develop faster and cleaner Oracle database applications. ODAC is a complete replacement for standard Oracle connectivity solutions and presents an efficient native alternative to the Borland Database Engine and dbExpress for access to Oracle.

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