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dao (data access objects) was the first object-oriented interface that exposed the microsoft jet database engine (used by microsoft access) and allowed visual basic developers to directly connect to access tables - as well as other databases - through odbc. dao is suited best for either single-system applications or for small, local deployments. 【推荐阅读:我的Thinking in Java学习】
ado isn´t automatically code-compatible with your existing data access applications. while ado encapsulates the functionality of dao and rdo, you must convert many of the language elements over to ado syntax. in some cases, this will mean only a simple conversion of some functions of your existing code. in other cases, it might be best to rewrite the application using ado´s new features.
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