By Günther Färber, Julia Kirchner
If youd wish to the best way to application your first executable ABAP functions, then this e-book is your excellent significant other. even if youre already acquainted with one other programming language, youll take advantage of trouble-free motives and step by step guideline to successfully grasp the fundamentals of programming business-critical purposes with ABAP.
Comprehensive, easy-to-follow descriptions introduce you to every of the suitable techniques and an ongoing useful situation that maintains through the ebook guarantees that you just make yourself familiar with all significant parts of ABAP improvement. a number of step by step techniques, screenshots, and answer suggestions are hired through the authors to explain procedural and object-oriented language components in a transparent and easy-to-understand means. In each one bankruptcy, youll additional expand the pattern program, permitting you to construct the talents had to simply reproduce the advance of a complete ABAP software - together with all of its difficult info.
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Extra info for ABAP Basics
More about how to auto-create a data structure in a database can be found in Chapter 9, “Command Line Tools” later in this book. In any case, it’s important that the data structure and the Doctrine 2 persistence mappings match. If not, we will be in trouble for sure. The schema tool can also be used to verify that data structure and persistence mappings match. In the following, let’s assume that we always create the data structure for the demo application using the schema tool. In this case, the users table will be created after invoking the proper schema tool commands: Col Type Length Id INT 11 NULL?
Looks like it is time for Doctrine 2 to enter the stage. 25 CHAPTER 4 Hello, Doctrine 2! In the previous chapter we learned about the complexity of an ORM the hard way by implementing our own persistence code. Doctrine 2 instead provides full transparent persistence for PHP objects by implementing the so called “Data Mapper Pattern”. Essentially, Doctrine allows the programmer to focus on the object-oriented business logic and takes the pain out of PHP object persistence. Don’t worry! We run through Doctrine 2 quickly in this chapter, but we will look into each individual aspect of it in depth later in the book.
The main annotation here is @Column. Its attribute type is the only mandatory attribute and is important to make persistence work correctly. If a wrong type is defined, you may lose information while saving to or reading from the database. In addition, there are many other optional attributes, such as name, which allows you to configure a table column name. It defaults to the name of the member variable. The length attribute is needed only for strings, where it defines the maximum length of a string value.