ABAP Select data from SAP table DISLACT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DISLACT table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to DISLACT. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the DISLACT table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_DISLACT TYPE STANDARD TABLE OF DISLACT,
      WA_DISLACT TYPE DISLACT,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <DISLACT> TYPE DISLACT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DISLACT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DISLACT
  INTO TABLE IT_DISLACT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DISLACT
*  INTO TABLE @DATA(IT_DISLACT2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_DISLACT INDEX 1 INTO DATA(WA_DISLACT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DISLACT ASSIGNING <DISLACT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DISLACT>-CLIENT = 1.
<DISLACT>-ISLNR = 1.
<DISLACT>-ISLVR = 1.
<DISLACT>-ACTCNT = 1.
<DISLACT>-ACTCAT = 1.

ENDLOOP.

LOOP AT IT_DISLACT INTO WA_DISLACT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DISLACT-ACTGRP, sy-vline,
  WA_DISLACT-ACTCOD, sy-vline,
  WA_DISLACT-ERNAM, sy-vline,
  WA_DISLACT-ERDAT, sy-vline,
  WA_DISLACT-ERTIM, sy-vline,
  WA_DISLACT-AENAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DISLACT you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_DISLACT TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_DISLACT INTO WA_DISLACT.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field ISLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DISLACT-ISLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DISLACT-ISLNR.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_DISLACT_STR, 
CLIENT TYPE STRING,
ISLNR TYPE STRING,
ISLVR TYPE STRING,
ACTCNT TYPE STRING,
ACTCAT TYPE STRING,
ACTGRP TYPE STRING,
ACTCOD TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
AETIM TYPE STRING,
FLGDEL TYPE STRING,
ISLATSEL TYPE STRING,
TXTACTGRP TYPE STRING,
TXTACTCOD TYPE STRING,
FLGUPD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DISLACT_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_DISLACT_STR-CLIENT sy-vline 
WA_DISLACT_STR-ISLNR sy-vline 
WA_DISLACT_STR-ISLVR sy-vline 
WA_DISLACT_STR-ACTCNT sy-vline 
WA_DISLACT_STR-ACTCAT sy-vline 
WA_DISLACT_STR-ACTGRP sy-vline 
WA_DISLACT_STR-ACTCOD sy-vline 
WA_DISLACT_STR-ERNAM sy-vline 
WA_DISLACT_STR-ERDAT sy-vline 
WA_DISLACT_STR-ERTIM sy-vline 
WA_DISLACT_STR-AENAM sy-vline 
WA_DISLACT_STR-AEDAT sy-vline 
WA_DISLACT_STR-AETIM sy-vline 
WA_DISLACT_STR-FLGDEL sy-vline 
WA_DISLACT_STR-ISLATSEL sy-vline 
WA_DISLACT_STR-TXTACTGRP sy-vline 
WA_DISLACT_STR-TXTACTCOD sy-vline 
WA_DISLACT_STR-FLGUPD sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.