After typing tens of thousands of lines of source code, I drew a "full map" for Mybatis

Author: Xiao Fu Ge Blog: https://bugstack.cn

Precipitate, share, grow, and let yourself and others gain something! 😄

1. Talk about: Postpartum feelings

🤔有人跟我说，手写Spring难，手写Mybatis易？

A magical force made me start working on Mybatis after writing Spring . At first, I also thought that Spring has been written down so much, how difficult can Mybatis be? But as I started to sort out, dismantle, and refine, the architecture model of the source code of the Mybatis framework found that 事情没那么简单 !

Why are things not that simple? Because if only to reflect the core structure and function of an ORM framework, 7/8 classes can be realized. But if it is to implement a complete ORM framework that connects important core context processes, at least more than 100 classes can be used to connect all the functions of Mybatis.

So why do things that can be done by a few classes, write and open the whole Mybatis and write a bunch of code to achieve it?

In fact, there is a very important point here, that is, what is the purpose of your learning the source code, is it for the interview? To get familiar with the process? To follow suit? In fact, in Brother Fu's view, these are not the core purpose and expected results of learning source code. We study the source code more to learn how to design the engineering architecture, what design principles and design patterns are used when these source codes face complex system problems , and how these applied ideas are implemented in the code.

This kind of thing is the content that should be paid attention to when learning source code, and it is also something that can really help developers improve their coding thinking height . So you will see that Brother Fu gradually disassembles the core functional modules of Mybatis, and through gradual development and implementation, unfolds the mystery of the design and implementation of Mybatis layer by layer ( PS：写过以后也不太神秘 ).

Second, the source code: the overall map

After Xiao Fu finished writing the Mybatis framework, he sorted out an overall map and previewed the execution context of the entire Mybatis framework. With this guide to open the fog of war map, it becomes very clear to learn the technology of Mybatis.

• This is the overall map of the entire "Handwritten Mybatis" . Brother Xiao Fu will take you to gradually realize the functional modules here, refine the implementation process of each module in chapters, and finally allow readers to realize a rich, comprehensive and detailed ORM framework. . In the process of learning, you can also refer to this picture to compare the handwritten code and the source code of Mybatis, which is more conducive to the understanding of the Mybatis framework.
• Usually, if you do not study fragmented and patchwork, but build your own knowledge stack systematically, then after you study, you will definitely be able to sort out a set of technical maps about what you have learned.

3. View: Brochure Catalog

🤔 Going to brag! 傅哥，手写Mybatis 而已，你怎么把 Mybatis 都手写了！

Hahaha, the writing is cool, so I'll knock it all by the way, including: parsing, binding, reflection, caching, transactions, and annotations, data sources, and MetaObjects are all done!

1. Directory

• Blog: https://bugstack.cn - 博客菜单中 Spring 栏目下 -> 手撸 Mybatis
• Description: In the 18-chapter course, the readers will gradually write a set of Mybatis framework by hand, and it is a set of Mybatis framework that connects all core processes. After reading and learning, you will have a thorough and clear understanding of the ORM source code.

2. Source code

• Source code: The code of each chapter will be extended and iterated on the basis of the previous chapter, so that you can know more clearly what functions are added in each chapter, what code has been changed, and what modules have been added. In this way, even a novice reader can learn and master it step by step.

3. Video (Station B)

• Video: https://www.bilibili.com/video/BV1nY4y1B7eT
• Description: The whole set of source code writing content will also be accompanied by a video explanation to help partners who are willing to learn the source code of Mybatis, who can quickly get started and deepen their learning and understanding.

Fourth, join: handwritten source code

The reason why a part of the booklet articles and a small amount of code are opened is to tell readers what kind of technical enthusiasts are learning and what kind of growth they can get.

It is precisely because of my tossing about technology, 😄 the ability that seems to be cowhide, that readers can be assured of their pursuit. A small part of the payment is also to make the road of technology sharing more firm. If it is not paid, then most of the reading may be other people's scribbled notes, rather than in-depth disassembly analysis, showing the ins and outs of the reader.

There are R&D partners who need school recruitment, interviews, promotions, want to improve their technical depth, renew their careers, can develop steadily, improve their technical systems, and pursue the advanced development and architect route.

Source address : https://gitcode.net/xiaofuge/small-mybatis

5. Summary: My Experience

In fact, I can know that most of the students who are engaged in developers or are in school are actually very good ways to improve their technology for learning source code. But in fact, most people don't know where to start with a source code framework. Many times, even reading the source code feels like 拿绣花针搅拌一缸水 , and it's quite exhausting to gain nothing.

This is because compared with the usual business requirements development or the case code that you learn by yourself, a lot of design principles and design patterns are used in the framework source code to carry out system functions 解耦 and 实现 , A lot of related technologies such as 反射 , 代理 , 字节码 are also used.

So if you don't have a big cow 带着你开路 , but try hard to find out by yourself, it is actually difficult to understand all the context of a set of source code. Because people always need a reference, accumulation and use of experience in the process of learning, so in the process of learning source code, they should also learn from the experience of others, enrich their own wings, and then use these routines to learn other source code Content just got easier.