ABAP 中的Screen, Dynpro, PBO, PAI小结
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教程链接: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:
Parameters: accommodate only one value (can also be used as checkboxes and radiobuttons).
Selection-options: a range of values or a set of values
Events:
Abap report programs areevent driven programs.
Load-of-program
Initialization : executedbefore the selection screen is displayed.
At Selection-Screen: the event is processed when the selection screen has been processed. Validation & Checks values happen here.
Start-of-Selection: The programstarts selection from tables
End-of-selection:
Format the report:
2. Dialog Programming Tutorial
A user dialog is any form of interaction between the user and the program
Entering data
Choosing a menu item
Clicking a button
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:
Transaction code: a transaction code is linked to an ABAP program and an initial screen
Screen: Each dialog is controlled by one or more screens.
GUI status: Each screen has GUI status.
ABAP Program: Each screen and GUI status in the R/3 system belongs to one ABAP program.
Screen Flow Logic:
.PBO:Before the screen is displayed
.PAI:After a user action on the screen
. POH: when F1
. POV: When F4Dynpro: A screen with its Flow logic is called a Dynpro.
ABAP Module Pool : On a PBO or PAI event a Dynpro calls an ABAP dialog program.
Screen Flow Logic定义了在screen上的各种事件,而Dynpro定义了这个Screen和各种事件。而 ABAP MODULE POOL会处理这些event, 在每次事件时调用一个ABAP program。
ALV Report:
是为了更加方便地打印Table。其中包含了很多的模块可以使用。
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