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simple-mybatis's Introduction

简单的Mybatis

这是根据mybatis运行原理实现到一个简易型mybatis框架

  • 已实现传统使用方式
    • 传统dao开发存在的问题
      • （1）存在加载配置文件，创建会话的代码重复
      • （2）存在调用mapperStatement存在硬编码问题
  • 已实现mapper动态代理使用方式
  • 暂未实现事务手动提交（PS: 默认执行一次mapper会自动提交）
    • PS: 因为在实际场景下，多数据源的切换和数据源事务的管理均反转到Spring进行管理

原声JDBC的问题

  • 数据库配置信息存在硬编码问题
  • 频繁创建和释放数据库链接
  • sql语句,设置参数,获取结果集均存在硬编码问题
  • 手动封装结果集较为繁琐

简单mybatis的解决思路

  • 将数据库配置信息存储到xml文件中
  • 使用数据库链接池管理数据库链接
  • 将sql存储到xml中，使用反射设置参数
  • 使用反射封装结果集

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