掌握SAP R3和ABAP的正确方法
过去 2.5 年我一直致力于 SAP 技术。 由于技术概念太多，我无法找到一个可以了解与之相关的所有内容的来源。我没有掌握所有技术概念的信心。
如果您遇到过这样的经历以及如何克服它，请帮助我。 推荐一些可能有帮助的书籍或您遵循的方法。
注：我已经从事过 Java/J2EE 工作。我对掌握这些概念有足够的信心。
I have been working on SAP technology for the last 2.5 years.
As there were so many technical concepts, I couldn't get a single source where I can learn about everything related to it. I didn't get the confidence of mastering all the technical concepts.
Please help me out if you have faced such an experience and how you overcame it.
Suggest some books or a methodology you followed which may be helpful.
Note: I have already worked in Java/J2EE. I am confident enough in mastering the concepts.
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显然，（或者更确切地说a）正确的方法将是适合您的方法，结论是您在尝试之前不知道该方法是否正确。 :-)
足够的哲学 - 我的建议是：
了解如何阅读 SAP 在线文档。这与阅读其他文档有点不同 - SAP 文档中充斥着有关您并不真正需要的遗留技术的信息。学会识别并跳过这些部分 - 您可以稍后再回来。
了解数据字典。它确实是所有事物的核心，如果您无法导航到那里并阅读结构，那么您就会迷失方向。开始阅读在线文档中的章节：http://help。 sap.com/saphelp_webas620/helpdata/en/cf/21ea0b446011d189700000e8322d00/frameset.htm。
阅读http://help.sap.com/saphelp_webas620 /helpdata/EN/fc/eb3138358411d1829f0000e829fbfe/frameset.htm。我知道内容很多，但它是免费的，而且几乎所有东西都在里面。再次强调，首先进行“快速索引运行”以了解其中的内容，然后深入研究基本概念。最低级别的 ABAP 与其他命令式/过程式语言没有本质上的不同。
遵循示例程序（事务代码 ABAPDOCU）。了解如何使用调试器（至关重要！）并了解演示程序中发生的情况。
一旦您掌握了基本语言的心智模型，就可以看看 ABAP 对象。如果您已经了解 Java，那么基本概念应该没有问题，但有一些特殊之处。
如果您遇到不明白的事情，请随时询问。
没有单一的信息源可以为您提供您必须了解的所有信息，特别是因为某些知识非常特定于上下文（FI、MM、IS-H，...）。
Obviously the (or rather a) correct approach would be one that works for you, the conclusion being that you don't know whether the approach was correct until you've tried it. :-)
Enough philosophy - my suggestions would be:
Learn how to read the SAP Online documentation. That's a bit different from reading other documentation - the SAP docs are littered with information about legacy techniques that you don't really need. Learn to identify and skip these parts - you can always come back later.
Develop a knowledge of the data dictionary. It's really at the heart of all things, and if you can't navigate there and read the structures, you're lost. Start reading the chapter in the online docs at http://help.sap.com/saphelp_webas620/helpdata/en/cf/21ea0b446011d189700000e8322d00/frameset.htm.
Read http://help.sap.com/saphelp_webas620/helpdata/EN/fc/eb3138358411d1829f0000e829fbfe/frameset.htm. I know that's a lot of stuff, but it's available for free, and almost everything is in there. Again, do a "fast indexing run" first to get a feeling of what's inside there, then dig into the basic concepts. ABAP at its lowest level isn't fundamentally different from other imperative / procedural languages.
Follow the example programs (transaction code ABAPDOCU). Learn how to use the debugger (vital!) and understand what's going on in the demo programs.
Once you've got a mental model of the basic language, take a look at ABAP Objects. If you already know Java, there should be no problem with the basic concepts, but there are a few specialties.
Feel free to ask if you run into something you don't understand.
There is no single source of information that will provide you with everything you have to know, especially since some of the knowledge is very specific to the context (FI, MM, IS-H, ...).