目录作用1、在运行时判断任意一个对象所属的类作用2、在运行时构造任意一个类的对象作用3、在运行时判断任意一个类所具有的成员变量和方法作用4、在运行时调用任意一个对象的方法总结反射（Reflection）是Java等编程
In a table, there is a column that contains ids separated by comas ex: \"159,167\" I want to do the equivalent of a join between this table and the table that contains those ids.
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