教程鏈接： www.guru99.com/abap-tutorial.html
1. All about ABAP Report programming.
SAP-ABAP contains two types of programs-- Report programs & Dialog program. Report programs are used when large amounts of data needs to be displayed.
Selection screen:
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Parameters: accommodate only one value (can also be used as checkboxes and radiobuttons).
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Selection-options: a range of values or a set of values
Events:
Abap report programs are event driven programs.
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Load-of-program
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Initialization : executed before the selection screen is displayed.
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At Selection-Screen: the event is processed when the selection screen has been processed. Validation & Checks values happen here.
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Start-of-Selection: The program starts selection from tables
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End-of-selection:
Format the report:
2. Dialog Programming Tutorial
A user dialog is any form of interaction between the user and the program
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Entering data
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Choosing a menu item
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Clicking a button
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Clicking or double clicking an entry
Dialog programs are created with types as ‘M’-Module Pool. They can’t be executed independently and must be attached to at least one transaction code in which you specify an initial screen.
The components of a dialog program are:
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Transaction code: a transaction code is linked to an ABAP program and an initial screen
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Screen: Each dialog is controlled by one or more screens.
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GUI status: Each screen has GUI status.
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ABAP Program: Each screen and GUI status in the R/3 system belongs to one ABAP program.
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Screen Flow Logic:
. PBO: Before the screen is displayed
. PAI: After a user action on the screen
. POH: when F1
. POV: When F4 -
Dynpro: A screen with its Flow logic is called a Dynpro.
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ABAP Module Pool : On a PBO or PAI event a Dynpro calls an ABAP dialog program.
Screen Flow Logic定義了在screen上的各種事件，而Dynpro定義了這個Screen和各種事件。而 ABAP MODULE POOL會處理這些event, 在每次事件時調用一個ABAP program。
ALV Report:
是爲了更加方便地打印Table。其中包含了很多的模塊可以使用。