ABAP Select data from SAP table ISAERSLIST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ISAERSLIST 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 ISAERSLIST. 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 ISAERSLIST 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_ISAERSLIST TYPE STANDARD TABLE OF ISAERSLIST,
      WA_ISAERSLIST TYPE ISAERSLIST,
      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: <ISAERSLIST> TYPE ISAERSLIST.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISAERSLIST
*  INTO TABLE @DATA(IT_ISAERSLIST2).
*--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_ISAERSLIST INDEX 1 INTO DATA(WA_ISAERSLIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISAERSLIST>-MANDT = 1.
<ISAERSLIST>-TRANSNO = 1.
<ISAERSLIST>-BELNR = 1.
<ISAERSLIST>-GJAHR = 1.
<ISAERSLIST>-LIFNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISAERSLIST-ADRNR, sy-vline,
  WA_ISAERSLIST-BUDAT, sy-vline,
  WA_ISAERSLIST-RMWWR, sy-vline,
  WA_ISAERSLIST-WAERS, sy-vline,
  WA_ISAERSLIST-WMWST1, sy-vline,
  WA_ISAERSLIST-NETT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISAERSLIST 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_ISAERSLIST 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_ISAERSLIST INTO WA_ISAERSLIST.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISAERSLIST-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISAERSLIST-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_ISAERSLIST-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISAERSLIST-GJAHR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field ADRNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISAERSLIST-ADRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISAERSLIST-ADRNR.
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_ISAERSLIST_STR, 
MANDT TYPE STRING,
TRANSNO TYPE STRING,
BELNR TYPE STRING,
GJAHR TYPE STRING,
LIFNR TYPE STRING,
ADRNR TYPE STRING,
BUDAT TYPE STRING,
RMWWR TYPE STRING,
WAERS TYPE STRING,
WMWST1 TYPE STRING,
NETT TYPE STRING,
WSKTO TYPE STRING,
TRANSDT TYPE STRING,
TRANSTIM TYPE STRING,
RETRANS TYPE STRING,
IDOCNO TYPE STRING,
IDOCCRDAT TYPE STRING,
STENR TYPE STRING,
STCEG TYPE STRING,
T_USER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISAERSLIST_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_ISAERSLIST_STR-MANDT sy-vline 
WA_ISAERSLIST_STR-TRANSNO sy-vline 
WA_ISAERSLIST_STR-BELNR sy-vline 
WA_ISAERSLIST_STR-GJAHR sy-vline 
WA_ISAERSLIST_STR-LIFNR sy-vline 
WA_ISAERSLIST_STR-ADRNR sy-vline 
WA_ISAERSLIST_STR-BUDAT sy-vline 
WA_ISAERSLIST_STR-RMWWR sy-vline 
WA_ISAERSLIST_STR-WAERS sy-vline 
WA_ISAERSLIST_STR-WMWST1 sy-vline 
WA_ISAERSLIST_STR-NETT sy-vline 
WA_ISAERSLIST_STR-WSKTO sy-vline 
WA_ISAERSLIST_STR-TRANSDT sy-vline 
WA_ISAERSLIST_STR-TRANSTIM sy-vline 
WA_ISAERSLIST_STR-RETRANS sy-vline 
WA_ISAERSLIST_STR-IDOCNO sy-vline 
WA_ISAERSLIST_STR-IDOCCRDAT sy-vline 
WA_ISAERSLIST_STR-STENR sy-vline 
WA_ISAERSLIST_STR-STCEG sy-vline 
WA_ISAERSLIST_STR-T_USER sy-vline      INTO ld_text SEPARATED BY SPACE.

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