User Dialog Overview
Update Statement
TABLES customers.
SELECT SINGLE * FROM customers WHERE id = 1.
IF sy-subrc = 0.
customers-name = ‘John’.
UPDATE customers.
ENDIF.
SAP System : Dialog Processing
SAP GUI
Report zpsm1.
Request
Tables customers.
List
1
Send Request
Application Server
Store request to queue
Select single * from
Generate Screen(List)
customers where id = 1.
11
Write: / customers-name.
Dispatcher
3
Send List
2
10
Request
Queue Send request to WP
SAP Buffer
Search for free WP
Check Program in Program Buffer
Program
6
4
D
D
D …
…
D
User Context
Area
5
9
Database Server
SQL Request
customers
7
Roll in
Load&Gen Program
D010S
8
Execute ABAP
statement
Dialog WP : Report
Dialog Work Process
Local Memory
User Context
TaskHandler
Memory Space
ABAP Processor
DYNPRO Processor
DB Interface
Result Set Memory
Database Server
List Buffer
SAP System : Dialog Processing
SAP GUI
Request
PROGRAM sapmzex001.
Screen
1
Send Request
Application Server
Store request to queue
INCLUDE ….
Generate Dialog Screen
CALL SCREEN 100.
11
…
Dispatcher
3
Send List
2
10
Request
Queue Send request to WP
SAP Buffer
Search for free WP
Check Program in Program Buffer
Program
6
4
D
D
D …
…
D
User Context
Area
5
9
Database Server
SQL Request
customers
7
Roll in
Load&Gen Program
D010S
8
Execute ABAP
statement
Dialog WP : Dialog Program
Dialog Work Process
Local Memory
User Context
TaskHandler
Memory Space
ABAP Processor
DYNPRO Processor
DB Interface
Result Set Memory
Database Server
Screen Buffer
Dialog Program : Transaction
Dialog Program Components
Transaction Code
Dialog Program
Program Naming Convention : SAPM[Z/Y]…
Screen : 100
(Screen Layout)
ABAP Module Pool
PAI
ABAP Module Pool
Flow Logic
Screen : 200
(Screen Layout)
PBO
PBO
ABAP Module Pool
PAI
ABAP Module Pool
Flow Logic
Data Transfer (Local Memory)
Local Memory
Screen Work Area
ok_code
Element List
ABAP Work Area
Screen Buffer
ABAP Memory Space
PBO
customers
id
customers-id
PAI
name
0000000
ok_code
city
…
Flow Logic

Process Before Output(PBO)


After it has processed all of the modules in the
PBO processing block, the system copies the
contents of the fields in the ABAP work area to
their corresponding fields in the screen work area.
Process After Input(PAI)

Before it processes the first module in the PAI
processing block, the system copies the contents
of the fields in the screen work area to their
corresponding fields in the ABAP work area.
OK Code Field in Screen
OK Code Field or
Command Field
(ok_code in Element List)
Defining Screen (4 Steps)




Screen Attribute
Screen Layout
Flow Logic
Element List
Element List(ok_code field)
Flow Logic in Screen 100
PROCESS BEFORE OUTPUT.
MODULE STATUS_0100.
PROCESS AFTER INPUT.
MODULE USER_COMMAND_0100.
PBO in Screen 100
MODULE status_0100 OUTPUT.
SET PF-STATUS ‘0100’.
SET TITLEBAR ‘0100’.
ENDMODULE.
PAI in Screen 100
MODULE user_command_0100 INPUT.
CASE ok_code.
WHEN ‘BACK’.
LEAVE PROGRAM.
WHEN space.
SELECT SINGLE * FROM customers WHERE id = customers-id.
IF sy-subrc = 0.
LEAVE TO SCREEN 200.
ENDIF.
ENDCASE.
ENDMODULE.
How to Create Dialog Program





Transaction SE80 : Create Dialog Program (SAPMY/Z…)
Create Screen(4 steps)
 Screen Attribute (Description)
 Screen Layout (Graphic Screen Painter)
 Flow Logic(PBO,PAI)
 Define Variable ok_code in Element List
Define Data Objects in ABAP Work Area at TOP
Include(TABLES, DATA,...)
Check and Activate Dialog Program
Create Transaction Code (Y/Z…)
Example I
Maintain Customers Data
Screen : 100
Screen : 200
Example I

Create Dialog Program SAPMZEX<nn> for
changing Customers table
 Screen 100
 Field customers-id
 Screen 200
 Field customers-id and customers-name
Example I

Screen 100
PROCESS BEFORE OUTPUT.
MODULE STATUS_0100.
PROCESS AFTER INPUT.
MODULE USER_COMMAND_0100.
Example I

Screen 100
MODULE status_0100 OUTPUT.
SET PF-STATUS ‘0100’.
SET TITLEBAR ‘0100’.
CLEAR ok_code.
ENDMODULE.
Example I

Screen 100
MODULE user_command_0100 INPUT.
CASE ok_code.
WHEN ‘BACK’.
LEAVE PROGRAM. “leave to screen 0
WHEN space.
SELECT SINGLE * FROM customers
WHERE id = customers-id.
LEAVE TO SCREEN 200.
ENDCASE.
ENDMODULE.
Example I

Screen 200
PROCESS BEFORE OUTPUT.
MODULE STATUS_0200.
PROCESS AFTER INPUT.
MODULE USER_COMMAND_0200.
Example I

Screen 200
MODULE status_0200 OUTPUT.
SET PF-STATUS ‘0200’.
SET TITLEBAR ‘0200’.
CLEAR ok_code.
ENDMODULE.
Example I

Screen 200
MODULE user_command_0200 INPUT.
CASE ok_code.
WHEN ‘BACK’.
LEAVE TO SCREEN 100. “SET SCREEN 100. LEAVE SCREEN.
WHEN ‘SAVE’.
UPDATE customers.
MESSAGE s000(38) WITH ‘Update OK!’.
LEAVE TO SCREEN 100.
ENDCASE.
ENDMODULE.
Example I

TOP Include
TABLES customers.
DATA ok_code TYPE sy-ucomm.

Create Transaction Code
Transaction Code : ZEX<nn>
Exercise
Create Dialog Program : SAPMZCUST<nn>
Transaction Code : ZCUST<nn>
Exercise : Customers Maintenance
Screen : 100
Screen : 200
Checking User Input

Check Input Data Using FIELD Statement
FIELD Statement

Screen 100 : Flow Logic (PAI)
PROCESS AFTER INPUT.
FIELD customers-id MODULE user_command_0100.
Example I

Screen 100 : PAI
MODULE user_command_0100 INPUT.
...
WHEN SPACE.
SELECT SINGLE * FROM customers WHERE id = customers-id.
IF sy-subrc <> 0.
MESSAGE e000(38) WITH ‘Customers data not found’.
ELSE.
LEAVE TO SCREEN 200.
ENDIF.
ENDCASE.
ENDMODULE.