ABAP Select data from SAP table SAPWLROLEG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SAPWLROLEG
*  INTO TABLE @DATA(IT_SAPWLROLEG2).
*--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_SAPWLROLEG INDEX 1 INTO DATA(WA_SAPWLROLEG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SAPWLROLEG>-USERMODE = 1.
<SAPWLROLEG>-FUNCTION = 1.
<SAPWLROLEG>-PROFILE = 1.
<SAPWLROLEG>-ALVVARIANT = 1.
<SAPWLROLEG>-SUBPROFILE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SAPWLROLEG-WAN, sy-vline,
  WA_SAPWLROLEG-SYSID, sy-vline,
  WA_SAPWLROLEG-SYSTYPE, sy-vline,
  WA_SAPWLROLEG-INSTANCE, sy-vline,
  WA_SAPWLROLEG-PERIOD, sy-vline,
  WA_SAPWLROLEG-STARTDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SAPWLROLEG 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_SAPWLROLEG 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_SAPWLROLEG INTO WA_SAPWLROLEG.


*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.
ENDFORM. 

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

TYPES: BEGIN OF T_SAPWLROLEG_STR, 
USERMODE TYPE STRING,
FUNCTION TYPE STRING,
PROFILE TYPE STRING,
ALVVARIANT TYPE STRING,
SUBPROFILE TYPE STRING,
WAN TYPE STRING,
SYSID TYPE STRING,
SYSTYPE TYPE STRING,
INSTANCE TYPE STRING,
PERIOD TYPE STRING,
STARTDATE TYPE STRING,
INDEX_LML TYPE STRING,
INDEX_FTRC TYPE STRING,
SERVICE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SAPWLROLEG_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_SAPWLROLEG_STR-USERMODE sy-vline 
WA_SAPWLROLEG_STR-FUNCTION sy-vline 
WA_SAPWLROLEG_STR-PROFILE sy-vline 
WA_SAPWLROLEG_STR-ALVVARIANT sy-vline 
WA_SAPWLROLEG_STR-SUBPROFILE sy-vline 
WA_SAPWLROLEG_STR-WAN sy-vline 
WA_SAPWLROLEG_STR-SYSID sy-vline 
WA_SAPWLROLEG_STR-SYSTYPE sy-vline 
WA_SAPWLROLEG_STR-INSTANCE sy-vline 
WA_SAPWLROLEG_STR-PERIOD sy-vline 
WA_SAPWLROLEG_STR-STARTDATE sy-vline 
WA_SAPWLROLEG_STR-INDEX_LML sy-vline 
WA_SAPWLROLEG_STR-INDEX_FTRC sy-vline 
WA_SAPWLROLEG_STR-SERVICE sy-vline      INTO ld_text SEPARATED BY SPACE.

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