ABAP Select data from SAP table SAPWLNRTD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SAPWLNRTD
*  INTO TABLE @DATA(IT_SAPWLNRTD2).
*--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_SAPWLNRTD INDEX 1 INTO DATA(WA_SAPWLNRTD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SAPWLNRTD>-SERVICETYP = 1.
<SAPWLNRTD>-TEXT = 1.
<SAPWLNRTD>-LONGTEXT = 1.
<SAPWLNRTD>-STEPCNT = 1.
<SAPWLNRTD>-COUNT1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SAPWLNRTD-COUNT1P, sy-vline,
  WA_SAPWLNRTD-COUNT1PC, sy-vline,
  WA_SAPWLNRTD-COUNT2, sy-vline,
  WA_SAPWLNRTD-COUNT2P, sy-vline,
  WA_SAPWLNRTD-COUNT2PC, sy-vline,
  WA_SAPWLNRTD-COUNT3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SAPWLNRTD 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_SAPWLNRTD 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_SAPWLNRTD INTO WA_SAPWLNRTD.


*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_SAPWLNRTD_STR, 
SERVICETYP TYPE STRING,
TEXT TYPE STRING,
LONGTEXT TYPE STRING,
STEPCNT TYPE STRING,
COUNT1 TYPE STRING,
COUNT1P TYPE STRING,
COUNT1PC TYPE STRING,
COUNT2 TYPE STRING,
COUNT2P TYPE STRING,
COUNT2PC TYPE STRING,
COUNT3 TYPE STRING,
COUNT3P TYPE STRING,
COUNT3PC TYPE STRING,
COUNT4 TYPE STRING,
COUNT4P TYPE STRING,
COUNT4PC TYPE STRING,
COUNT5 TYPE STRING,
COUNT5P TYPE STRING,
COUNT5PC TYPE STRING,
COUNT6 TYPE STRING,
COUNT6P TYPE STRING,
COUNT6PC TYPE STRING,
COUNT7 TYPE STRING,
COUNT7P TYPE STRING,
COUNT7PC TYPE STRING,
COUNT8 TYPE STRING,
COUNT8P TYPE STRING,
COUNT8PC TYPE STRING,
COUNT9 TYPE STRING,
COUNT9P TYPE STRING,
COUNT9PC TYPE STRING,
COUNT10 TYPE STRING,
COUNT10P TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SAPWLNRTD_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_SAPWLNRTD_STR-SERVICETYP sy-vline 
WA_SAPWLNRTD_STR-TEXT sy-vline 
WA_SAPWLNRTD_STR-LONGTEXT sy-vline 
WA_SAPWLNRTD_STR-STEPCNT sy-vline 
WA_SAPWLNRTD_STR-COUNT1 sy-vline 
WA_SAPWLNRTD_STR-COUNT1P sy-vline 
WA_SAPWLNRTD_STR-COUNT1PC sy-vline 
WA_SAPWLNRTD_STR-COUNT2 sy-vline 
WA_SAPWLNRTD_STR-COUNT2P sy-vline 
WA_SAPWLNRTD_STR-COUNT2PC sy-vline 
WA_SAPWLNRTD_STR-COUNT3 sy-vline 
WA_SAPWLNRTD_STR-COUNT3P sy-vline 
WA_SAPWLNRTD_STR-COUNT3PC sy-vline 
WA_SAPWLNRTD_STR-COUNT4 sy-vline 
WA_SAPWLNRTD_STR-COUNT4P sy-vline 
WA_SAPWLNRTD_STR-COUNT4PC sy-vline 
WA_SAPWLNRTD_STR-COUNT5 sy-vline 
WA_SAPWLNRTD_STR-COUNT5P sy-vline 
WA_SAPWLNRTD_STR-COUNT5PC sy-vline 
WA_SAPWLNRTD_STR-COUNT6 sy-vline 
WA_SAPWLNRTD_STR-COUNT6P sy-vline 
WA_SAPWLNRTD_STR-COUNT6PC sy-vline 
WA_SAPWLNRTD_STR-COUNT7 sy-vline 
WA_SAPWLNRTD_STR-COUNT7P sy-vline 
WA_SAPWLNRTD_STR-COUNT7PC sy-vline 
WA_SAPWLNRTD_STR-COUNT8 sy-vline 
WA_SAPWLNRTD_STR-COUNT8P sy-vline 
WA_SAPWLNRTD_STR-COUNT8PC sy-vline 
WA_SAPWLNRTD_STR-COUNT9 sy-vline 
WA_SAPWLNRTD_STR-COUNT9P sy-vline 
WA_SAPWLNRTD_STR-COUNT9PC sy-vline 
WA_SAPWLNRTD_STR-COUNT10 sy-vline 
WA_SAPWLNRTD_STR-COUNT10P sy-vline      INTO ld_text SEPARATED BY SPACE.

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