Dialog Programming Overview

SAP System : Dialog Processing (Report)SAP GUIReport zpsm1.

Request

Tables customers.

Application ServerStore request to queue3

Send Request

1

Generate Screen(List)10

List

Select single * from customers where id = 1. Write: / customers-name.

DispatcherSend List2 9

Search for free WP

SAP BufferProgram

Request Queue Send request to WP4

Check Program in Program Buffer5

7

Execute ABAP statement

D8

DSQL Request

D

D6

Load&Gen Program

Database Server

Dialog WP : Executable ProgramDialog WPTaskHandler

Local Memory

Memory Space

ABAP Processor

DYNPRO Processor

List Buffer

DB InterfaceResult Set Memory

Database

Types of ABAP Report1 3

1. Report Listing

4

2. Drill-down Report 3. Control-break Report 4. ALV Report

SAP System : Dialog Processing (DIALOG)SAP GUIProgram sapmzex001.

Request

Include .

Application ServerStore request to queue3

Send Request

1

Generate Dialog Screen10

Screen

Set screen 100.

DispatcherSend List2 9

Search for free WP

SAP BufferProgram

Request Queue Send request to WP4

Check Program in Program Buffer5

7

Execute ABAP statement

D8

DSQL Request

D

D6

Load&Gen Program

Database Server

Dialog WP : Dialog ProgramDialog WPTaskHandler

Local MemoryABAP Memory

ABAP Processor

DYNPRO Processor

Screen Buffer

DB InterfaceResult Set Memory

Database

Dialog Program : Transaction

Dialog Program ComponentsTransaction Code

Dialog Program

Program Naming Convention : SAPM

Screen : 100(Screen Layout)Flow Logic

PBOPAI

ABAP Module Pool

ABAP Module Pool

Screen : 200(Screen Layout)Flow Logic

PBO PAI

ABAP Module Pool

ABAP Module Pool

SAP TransactionDB Commit DB Commit

An SAP transaction consists of Dialog steps. A Dialog step begins when the user press Enter,activates a function by pressing a function key,double-clicks or chooses a function from a menu.It ends when the next screen is display In the course of a Dialog step,The PAI modules belonging to the current screen and the PBO modules belonging to the next screen

Data Transfer (Local Memory)Local Memory

Screen Work Areaok_code

ABAP Work AreaABAP Memory Spacecustomers id name city

Screen BufferElement List

PBO

customers-id customers-name

0000000

PAI

ok_code

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 ScreenOK 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 100PROCESS BEFORE OUTPUT. MODULE STATUS_0100.

PROCESS AFTER INPUT. MODULE USER_COMMAND_0100.

PBO in Screen 100MODULE status_0100 OUTPUT. SET PF-STATUS 0100. SET TITLEBAR 0100. ENDMODULE.

PAI in Screen 100MODULE user_command_0100 INPUT. CASE ok_code. WHEN EXIT. Leave program SET SCREEN 0. LEAVE SCREEN. Leave to screen 0 WHEN SAVE. UPDATE customers. MESSAGE S000(38) WITH Update OK. SET SCREEN 50. LEAVE SCREEN. ENDCASE. ENDMODULE.

How to Create Dialog Program

Transaction SE80 : Create Dialog Program Create Screen(4 steps) Screen Attribute Screen Layout Flow Logic(PBO,PAI) Define Variable ok_code in Element List Define Data Object in ABAP Work Area at TOP Include(Tables, Data,...) Check and Activate Dialog Program Create Transaction Code

Example IMaintain Customers DataScreen : 100

Screen : 200

Example I

Create Dialog Program SAPMZEX for changing Customers table Screen 100 Field customers-id Screen 200 Field customers-id and customers-name

Example I

Screen 100PROCESS BEFORE OUTPUT. MODULE STATUS_0100. PROCESS AFTER INPUT. MODULE USER_COMMAND_0100.

Example I

Screen 100MODULE status_0100 OUTPUT. SET PF-STATUS 0100. SET TITLEBAR 0100. ENDMODULE.

Example I

Screen 100MODULE user_command_0100 INPUT. CASE ok_code. WHEN BACK. LEAVE PROGRAM. leave to screen 0 WHEN space. if not assign Enter Key SELECT SINGLE * FROM customers WHERE id = customers-id. LEAVE TO SCREEN 200. ENDCASE. ENDMODULE.

Example I

Screen 200PROCESS BEFORE OUTPUT. MODULE STATUS_0200. PROCESS AFTER INPUT. MODULE USER_COMMAND_0200.

Example I

Screen 200MODULE status_0200 OUTPUT. SET PF-STATUS 0200. SET TITLEBAR 0200. ENDMODULE.

Example I

Screen 200

MODULE user_command_0200 INPUT. CASE ok_code. WHEN BACK. LEAVE TO SCREEN 100. set screen 100 WHEN SAVE. UPDATE customers. MESSAGE S000(38) WITH Update OK!. LEAVE TO SCREEN 100. ENDCASE. ENDMODULE.

Example I

TOP Include Create Transaction Code

TABLES customers. DATA ok_code TYPE sy-ucomm.

Transaction Code : ZEX

ExerciseCreate Dialog Program : SAPMZCUST Transaction Code : ZCUST

Exercise : Customers MaintenanceScreen : 100

Screen : 200

Setting the Cursor Position DynamicallyPROCESS BEFORE OUTPUT. MODULE STATUS_0200. MODULE set_cursor.

MODULE set_cursor OUTPUT. SET CURSOR FIELD CUSTOMERS-CITY OFFSET 3. ENDMODULE.

Cursor Position

Avoiding the Unexpected Processing Step of ok_code Field

1. Auxiliary OK_CODE Variable

TOP Include

TABLES customers. DATA ok_code TYPE sy-ucomm. DATA save_ok TYPE sy-ucomm.

Example I - Change

Screen 100 : PAIMODULE user_command_0100 INPUT. save_ok = ok_code. CLEAR ok_code. CASE save_ok. WHEN BACK. LEAVE PROGRAM. WHEN space. SELECT SINGLE * FROM customers WHERE id = customers-id. LEAVE TO SCREEN 200. ENDCASE. ENDMODULE.

Example I - Change

Screen 200 : PAIMODULE user_command_0200 INPUT. save_ok = ok_code. CLEAR ok_code. CASE save_ok. WHEN BACK. LEAVE TO SCREEN 100. WHEN space. LEAVE TO SCREEN 200. WHEN SAVE. UPDATE customers. MESSAGE s000(38) WITH Update OK!. LEAVE TO SCREEN 100. ENDCASE.

ENDMODULE.

2. Specify the Enter Function at GUI Status

Check Enter Function

Screen 100 : PAIMODULE user_command_0100 INPUT. CASE ok_code. WHEN BACK. LEAVE PROGRAM. WHEN ENTE. SELECT SINGLE * FROM customers WHERE id = customers-id. LEAVE TO SCREEN 200. ENDCASE.

ENDMODULE.

3. Clear OK_CODE at PBO

Screen 100 : Flow LogicPROCESS BEFORE OUTPUT. MODULE STATUS_0100. MODULE clear_ok_code. PROCESS AFTER INPUT. MODULE USER_COMMAND_0100.

Clear OK_CODE at PBO

Screen 100 : PBOMODULE status_0100 OUTPUT. SET PF-STATUS 0100. SET TITLEBAR 0100. ENDMODULE.

MODULE clear_ok_code OUTPUT. CLEAR ok_code. ENDMODULE.

Checking User Input

Example IIMaintain Customers Data

Check Input Data Manually

Example II

Screen 100 : PAIMODULE user_command_0100 INPUT. ... WHEN SPACE. SELECT SINGLE * FROM customers WHERE id = customers-id. IF sy-subrc 0. MESSAGE S000(38) WITH Customers data not found. LEAVE TO SCREEN 100. ELSE. LEAVE TO SCREEN 200. ENDIF. ENDCASE. ENDMODULE.

Example IIIMaintain Customers Data

Check Input Data Using Field Command

Example III Field Statement

Screen 100 : Flow Logic (PAI)PROCESS AFTER INPUT. FIELD customers-id MODULE user_command_0100.

Example III

Screen 100 : PAIMODULE 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.

Field Input Checking

If you want to check input values in the module pool and start dialog in the event of a negative result,you use the FIELD statement with the addition MODULE. If the module results in an error(E) or warning(W) message,the screen is redisplayed without processing the PBO modules.The message text is displayed and only the field being checked by this module becomes ready for input again

Field Statement With More Than 1 Field

Screen 100 : Flow Logic (PAI)PROCESS AFTER INPUT. CHAIN. FIELD: customers-id,customers-custtype MODULE user_command_0100. ENDCHAIN.

PROCESS AFTER INPUT. CHAIN. FIELD customers-id MODULE user_command_0100. FIELD customers-custtype MODULE user_command_0100. ENDCHAIN.

Field Statement & Data TransportPROCESS AFTER INPUT. MODULE a. FILED f1 MODULE b. FILED f2 MODULE c. MODULE d.Screen 100f1 f3 f2 f4

Transfer f3,f4 Call module a Transfer f1 Call module b Transfer f2 Call module c Call module d

Required Field

Required Field

Required Field

At exit-command

Function Type : Exit Command

At exit-command

When user chooses a function with type E,the screen flow logic jumps directly to the following statement

MODULE AT EXIT-COMMAND

No other screen fields are transported to the program except OK Code field

At exit-command

Screen 100 : Flow LogicPROCESS BEFORE OUTPUT. MODULE STATUS_0100. PROCESS AFTER INPUT. MODULE exit AT EXIT-COMMAND. MODULE USER_COMMAND_0100.

At exit-command

Screen 100 : PAIMODULE exit INPUT. CASE ok_code. WHEN EXIT. LEAVE PROGRAM. ENDCASE. ENDMODULE.

LEAVE PROGRAM.

Function Module (POPUP_TO_CONFIRM_LOSS_OF_DATA)

Example IVMaintain Customer Data

Popup confirmation data using functionPOPUP_TO_CONFIRM_LOSS_OF_DATA

Example IV

TOP Include... DATA ans.

Example IV

Screen 100 : PAIMODULE exit INPUT.CALL FUNCTION POPUP_TO_CONFIRM_LOSS_OF_DATA EXPORTING textline1 = Are you sure? titel = Please Confirm!!! IMPORTING answer = ans. IF ans = J. J = Ja in German= Yes in English LEAVE PROGRAM. ELSE. ENDIF.

ENDMODULE.

SAP Transaction : Enqueue Lock Object

SAP Transaction & DB Transaction

Each Dialog step can contain update requests(INSERT,DELETE,UPDATE) After each Dialog step,the R/3 system automatically passes a database commit to the database system.The database system then distributes the update requests from the individual dialog steps across several database transactions A rollback in one Dialog step has no effect on database updates performed in previous Dialog steps

SAP Transaction(LUW)DB Commit DB Commit

DB LUW

SAP LUW

SAP Database Maintenance Steps

Check data locking by calling function ENQUEUE_ Read data from Database Ex. Select single Data Processing Ex. Update ... Release lock by calling function DEQUEUE_

SAP Lock Object

Transaction SE11 : Lock object

ENQUEUE_ DEQUEUE_

SAP Lock Object : Function Module

Example IV

ENQUEUE /DEQUEUELock Object(SE11) CALL FUNCTION ENQUEUE_EZCUST CALL FUNCTION DEQUEUE_EZCUST

User 1

User 2

Example IV (I)

Screen 100 : PAIMODULE user_command_0100 INPUT. ... WHEN SPACE. CALL FUNCTION ENQUEUE_EZCUST00 EXPORTING id = customers-id EXCEPTIONS ... IF sy-subrc 0.MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.

ELSE. SELECT SINGLE * FROM customers WHERE id = customers-id. ...

Example IV (II)

Screen 100 : PAIMODULE user_command_0100 INPUT. ... WHEN SPACE. CALL FUNCTION ENQUEUE_EZCUST00 EXPORTING message id sy-msgid type sy-msgty number id = customers-id sy-msgno with sy-msgv1 sy-msgv2 ... sy-msgv3 sy-msgv4. IF sy-subrc 0. CONCATENATE Data was locked by : sy-msgv1 INTO mess. MESSAGE E000(38) WITH mess. ELSE. SELECT SINGLE * FROM customers WHERE id = customers-id. ...

Example IV

Screen 200 : PAIMODULE user_command_0200 INPUT. ... WHEN BACK. CALL FUNCTION DEQUEUE_EZCUST00 EXPORTING id = customers-id. LEAVE TO SCREEN 100.

Example IV

Screen 200 : PAIMODULE user_command_0200 INPUT. ... WHEN SAVE. UPDATE customers. MESSAGE S000(38) WITH Update OK!. CALL FUNCTION DEQUEUE_EZCUST00 EXPORTING id = customers-id. LEAVE TO SCREEN 100. ... ...

Monitoring Enqueue Lock : SM12