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MyBatis源码学习笔记一

 3 years ago
source link: https://segmentfault.com/a/1190000040399451
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mybatis的创建SqlSession的过程：

image.png

Mybatis使用代理Dao的执行过程：

Mybatis只需提供一个Dao接口，就可以实现与数据库的CRUD交互，这种情形，我们很容易想到用JDK动态代理去实现，事实上也确实如此。
客户端是通过拿到Mybatis提供的Dao接口的代理对象，来进行CRUD操作，过程如下：
image.png

我们直接去看下

  public T newInstance(SqlSession sqlSession) {
    final MapperProxy<T> mapperProxy = new MapperProxy<T>(sqlSession, mapperInterface, methodCache);
    return newInstance(mapperProxy);
  }
  @SuppressWarnings("unchecked")
  protected T newInstance(MapperProxy<T> mapperProxy) {
    return (T) Proxy.newProxyInstance(mapperInterface.getClassLoader(), new Class[] { mapperInterface }, mapperProxy);
  }

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