最近在后台写些东东用到Oracle Objects的继承等方面的知识，翻了下Oracle的文档资料．
记录下资料的链接，方便以后查询：
9i:Basic Components of Oracle Objects
10g:Basic Components of Oracle Objects
建议先看9i，感觉9i的目录结构更加清晰．
我碰到的一些问题的解决方法（相信如果你用object type的继承，也一定会有这些问题 ^-^）：
1.how to invoke overriden methods in a super type
2.PLS-00363: expression 'SELF' cannot be used as an assignment target
摘要：
All methods in an object type accept an instance of that type as their first parameter. The name of this built-in parameter is SELF. Whether declared implicitly or explicitly, SELF is always the first parameter passed to a method.
In member functions, if SELF is not declared, its parameter mode defaults to IN. However, in member procedures, if SELF is not declared, its parameter mode defaults to IN OUT.
In member functions, if SELF is not declared, its parameter mode defaults to IN. However, in member procedures, if SELF is not declared, its parameter mode defaults to IN OUT.
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/195110/viewspace-746261/ ，如需转载，请注明出处，否则将追究法律责任。
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