...引的依靠情况> 函数索引依靠于在定义索引时使用的表达式中的函数,如果这个函数是PL/SQL 函数 或者是包函数(package function),那么,一旦这个这个函数发生任何变化(any changes to the funcion sepcification),这个索引就会被停用。
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如果碰巧该闭包函数跟某个事件绑定,那么就必须要解绑定。
If you happened to attach the closure to an event, then you would have to detach it from that event.
从外部环境中导入的变量是在闭包函数定义的use子句中指定的。
Variables to be imported from the outside environment are specified in the use clause of the closure function definition.
闭包函数和 lambda 函数绝对不是新出现的概念;它们均来自函数编程领域。
The concepts of closures and lambda functions are definitely not new ones; they both come from the functional programming world.
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