#associative

ORA-25330: PL/SQL associative arrays may not be used with AQ array operations

文档解释ORA-25330:PL/SQLassociativearraysmaynotbeusedwithAQarrayoperationsCause:APL/SQLassociativearraywasprovidedforthepayloadparameterinanenqueue/dequeuearrayoper...

Associative References(关联引用)

category是不能创建实例变量的,但我们可以通过关联引用来达到这样的目的。特别是当你不持有这个类,比如说系统的类,而你又的确需要添加一个property。staticcharobjcAddress;//给对象_sub关联一个字符串属性objcAddress,并做赋值objc_setAssociatedObject(...