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ITB258ABAP Programming

Lecture 11

Using Tables in Transactions


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Objectives

This lecture aims to introduce the concepts

associated with:

Table controls:graphical screen elements used

for displaying more than nrows of a table on a

single screen

screen flow logicfor handling table controls


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Using Tables in a Screen

ABAP offers the Table Controlgraphicalelement as a mechanism for displaying and

modifying tabular data in a screen a Table Control is a screen container or

object that allows display of multiple rows ofa table (database or internal) on a screen

Good for displaying a one-to-manyrelationship on the one screen.


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Table Control


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Table Controls Table Control features allow

horizontal & vertical scrolling

column width resizing

scrolling within a field (where contents are

wider than the screen field width)reordering the sequence of columns

saving the current display settings for future use

selection of table rows & columns

Formatting features includeautomatic table resizing on window resize

separator lines between rows & columns

column header fields for all columns


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Creating a Table Control

In the TOP Include object:

CONTROLS ctrlTYPE TABLEVIEW

USING SCREEN scr.

TABLEVIEWcorresponds to a complex type

(CXTAB_CONTROL defined in the ABAP dictionary) USING SCREENdetermines the screen from

which the table control will get its initial values


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CXTAB_CONTROL


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Adding a Table Control to a Screen

Enter a Name for the Table Control


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Press Dict/program fields pushbutton

Adding Fields to a Table Control


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Enter database table name

Select Get From Dictionary


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Enter internal table name

Select Get From program


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Mark the fields to be added to the table control

Then click on Copy to select the fields


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The label for each column is a textfield, created by clicking on thetext field icon and then draggingthe new text field onto the headerof the column before typing in the

label

Text field icon


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Table Control Principles

Database Table

Internal Table

(Buffer)

1. Internal Table filled withselected data


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Internal Table

(Buffer)

2. Table Control contentsfilled from internal table

Table

Control


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Internal Table

(Buffer)

Table

Control

3. Changes to Table Controlcontents copied to internal

table


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Database Table

Internal Table

(Buffer)

4. When screen is closed, internal table

contents copied back to database


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PBO

PAI

Select rows from

the database into

an internal table

Screen 1

PBO

PAI

Screen 2 (with table control)

LOOP ...read internal table into

table control line by line

ENDLOOP.

LOOP ...

update internal table from

table control line by line

ENDLOOP.


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All screen fields that do not

belong to a table control and are

not specified in a FIELD

statement are transported to

module pool fields

Table control fields are

transported row by row to

module pool fields

Fields specified in FIELD

statements are transported

immediately before the FIELD

statement is executed

LOOP start

LOOP end

transport screen tablecontrol fields to ABAP

module pool fields

transport all fields from

the screen to ABAP fields

excluding table control fields

PROCESS AFTER INPUT


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Table Controls in the Flow Logic

PROCESS BEFORE OUTPUT.

LOOP AT ITAB WITH CONTROL FLIGHTS

CURSOR FLIGHTS-CURRENT_LINE.ENDLOOP.

PROCESS AFTER INPUT.

LOOP AT ITAB.

MODULE MODIFY_ITAB.

ENDLOOP.

MODULE MODIFY_ITAB INPUT.

MODIFY ITAB INDEX FLIGHTS-CURRENT_LINE.

ENDMODULE.

Method 1 (table control fields = itab fields)


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Method 2 (table control fields = dict. fields)


LOOP WITH CONTROL FLIGHTS.

MODULE READ_ITAB.

ENDLOOP.



MODULE MODIFY_ITAB.

ENDLOOP.

MODULE READ_ITAB OUTPUT.

READ TABLE ITAB INDEX

FLIGHTS-CURRENT_LINE.

IF SY-SUBRC EQ 0.

MOVE-CORRESPONDING ITAB TO SFLIGHT.

ELSE.

EXIT FROM STEP-LOOP.

ENDIF.

ENDMODULE.

MODULE MODIFY_ITAB INPUT.MOVE-CORRESPONDING SFLIGHT TO ITAB.

MODIFY ITAB INDEX


ENDMODULE.


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MODULE READ_ITAB.

ENDLOOP.



CHAIN.

FIELD: SFLIGHT-PRICE,

SFLIGHT-FLDATE.

MODULE MODIFY_ITAB

ON CHAIN-REQUEST.ENDCHAIN.

ENDLOOP.

MODULE READ_ITAB OUTPUT.

READ TABLE ITAB INDEX


IF SY-SUBRC EQ 0.


ELSE.

EXIT FROM STEP-LOOP.

ENDIF.

ENDMODULE.

MODULE MODIFY_ITAB INPUT.MOVE-CORRESPONDING SFLIGHT TO ITAB.

MODIFY ITAB INDEX


ENDMODULE.

Method 2 (table control fields = dict. fields)


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Table Control Attributes

data: begin of cxtab_control,

...

cols type cxtab_columnoccurs 10,

end of cxtab_control.

data: begin of cxtab_column,

...

selected,

screen like screen,

end of cxtab_column.

SCREEN FIELDS:

name

length

active

...


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Sorting a Table Control by a

Selected Field

DATA: WA LIKE LINE OF FLIGHTS-COLS.

...

MODULE USER_COMMAND_200....

LOOP AT FLIGHTS-COLS INTO WA.

IF WA-SELECTED = X.

SORT ITAB BY (WA-SCREEN-NAME+5).ENDIF.

ENDLOOP.

ENDMODULE.


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Sample Fields

List

Output only fields

Table Control


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Updating the Internal Table



CHAIN.


SFLIGHT-FLDATE.

MODULE MODIFY_ITABON CHAIN-REQUEST.

ENDCHAIN.

ENDLOOP.

Method 1 Method 2


LOOP AT ITAB.

CHAIN.


SFLIGHT-FLDATE.

MODULE MODIFY_ITABON CHAIN-REQUEST.

ENDCHAIN.

ENDLOOP.


ITAB-MARK = 'X'.MODIFY ITAB INDEX


ENDMODULE.


MOVE-CORRESPONDING SFLIGHTTO ITAB.

ITAB-MARK = 'X'.

MODIFY ITAB INDEX


ENDMODULE.


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Updating the Database

Saving the Updated Data (both methods)

MODULE USER_COMMAND_200.

CASE OK_CODE.

WHEN SAVE.

LOOP AT ITAB.

CHECK ITAB-MARK = X.


UPDATE SFLIGHT.

ENDLOOP.

WHEN ...

...

ENDCASE.

ENDMODULE.


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Updating the database

Exit modules are

processed before any

data is transferred from

screen to program(including updating

SY-DATAR), so this is

the only way to capture

changed data if an exit

is triggered.


FIELD:

MODULE SET_FLAG ON REQUEST.

MODULE SET_FLAG INPUT.

FLAG = 'X'.

ENDMODULE.

MODULE EXIT INPUT.IF FLAG = 'X'.

ENDIF.

LEAVE TO SCREEN 0.

ENDMODULE.


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Conclusion

This lectured examined concepts associatedwith the use of Table Controls in a screen

definitioncreation

maintenance

filling

modifying

sorting

saving


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Related Reading

Textbook

Ch 3.3 - Dialog Applications

On Line HelpR/3 LibraryBC..ABAP Workbench

BC ABAP Users Guide ABAP User Interface Screens

Processing User input on a Screen, Controlling theScreen Flow, Modifying the Screen, Using Tables in aScreen


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Next Week

Review of semester

Please ask questions!

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