之前共享的那个SAP Press – OData and SAP NetWeaver Gateway.pdf好像第一版本的，虽然我看了大半，也没发现有什么问题，不过今天有朋友给了这个SAP_Press_-_SAP_Gateway_and_OData_(2ed)2016.pdf，说是这是第二版本的，所以分享一下，主要是学习SAP Gateway 及ODATA，主要的功能就是事务码：
SEGW,
/IWFND/MAINT_SERVICE
/IWFND/ERROR_LOG
In May 2011, SAP launched SAP N etWeaver Gateway (now called SAP
Gateway) at SAPPHIRE NOW. Since then, SAP Gateway has become a
successful, well-established, and adopted product. It even became part
of the standard delivery of SAP N et Weaver (7.40 and higher).
So what is SAP Gateway? The short answer is that SAP Gateway is a tech-
nology that improves the reach of SAP business applications. It increases
the range of SAP business applications not only in terms of end users but
also with regard to the number of developers and addressable environ-
ments. With the help of SAP Gateway, SAP business applications, parts
of those applications, or simply SAP data can be used by an application
developer without prior knowledge of SAP to build- for example-
mobile applications.
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