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手敲Mybatis-反射工具天花板_渣渣洒泪成长记的博客-CSDN博客
历时漫长的岁月,终于鼓起勇气继续研究Mybatis的反射工具类们,简直就是把反射玩出花,但是理解起来还是很有难度的,涉及的内容代码也颇多,所以花费时间也比较浩大,不过当了解套路每个类的功能也好,设计也好,基本也可以浓缩成一句话理解,心中有了系统也好似没有那么难理解了,本节如在工作中使用到此场景,可以拿来当作工具直接使用。 前言-为什么使用反射 在手敲Mybatis-数据源池化处理实现那一节,我们留下了坑需要填,在获取连接时,数据库连接的设置还是硬编码,如果我们此时xml文件又需要新增加一些属性,就需要进行修改代码,会发现代码设计不太灵活,本节就为了解决此问题,来一起写一个很强大的反射工具类。 UML类图-类关系介绍 MyBatis设计将分为以下几个类,元类、元对象、对象包装器、反射器、调用者、对象工厂,下面就介绍这几个设计都是干什么的: SystemMetaObject:系统入口,万物的开始,系统级别的元对象 MetaObject:元对象,外部系统调用入口,封装了包装器对象,在构造方法中使用策略模式来调用不同的对象包装器...
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