ABAP Select data from SAP table WLMTD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLMTD
*  INTO TABLE @DATA(IT_WLMTD2).
*--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_WLMTD INDEX 1 INTO DATA(WA_WLMTD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLMTD>-MANDT = 1.
<WLMTD>-LAYVR = 1.
<WLMTD>-LBRNR = 1.
<WLMTD>-SORF1 = 1.
<WLMTD>-SPRAS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLMTD-TXTID, sy-vline,
  WA_WLMTD-ZEINR, sy-vline,
  WA_WLMTD-TXTZL, sy-vline,
  WA_WLMTD-UPDKZ, sy-vline,
  WA_WLMTD-SELKZ, sy-vline,
  WA_WLMTD-TXTL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLMTD 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_WLMTD 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_WLMTD INTO WA_WLMTD.


*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 ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_WLMTD-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLMTD-SPRAS.
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_WLMTD_STR, 
MANDT TYPE STRING,
LAYVR TYPE STRING,
LBRNR TYPE STRING,
SORF1 TYPE STRING,
SPRAS TYPE STRING,
TXTID TYPE STRING,
ZEINR TYPE STRING,
TXTZL TYPE STRING,
UPDKZ TYPE STRING,
SELKZ TYPE STRING,
TXTL TYPE STRING,
LTEX1 TYPE STRING,
LTEX2 TYPE STRING,
LTEX3 TYPE STRING,
LTEX4 TYPE STRING,
LFOR1 TYPE STRING,
LFOR2 TYPE STRING,
LFOR3 TYPE STRING,
LFOR4 TYPE STRING,
KZMEHR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLMTD_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_WLMTD_STR-MANDT sy-vline 
WA_WLMTD_STR-LAYVR sy-vline 
WA_WLMTD_STR-LBRNR sy-vline 
WA_WLMTD_STR-SORF1 sy-vline 
WA_WLMTD_STR-SPRAS sy-vline 
WA_WLMTD_STR-TXTID sy-vline 
WA_WLMTD_STR-ZEINR sy-vline 
WA_WLMTD_STR-TXTZL sy-vline 
WA_WLMTD_STR-UPDKZ sy-vline 
WA_WLMTD_STR-SELKZ sy-vline 
WA_WLMTD_STR-TXTL sy-vline 
WA_WLMTD_STR-LTEX1 sy-vline 
WA_WLMTD_STR-LTEX2 sy-vline 
WA_WLMTD_STR-LTEX3 sy-vline 
WA_WLMTD_STR-LTEX4 sy-vline 
WA_WLMTD_STR-LFOR1 sy-vline 
WA_WLMTD_STR-LFOR2 sy-vline 
WA_WLMTD_STR-LFOR3 sy-vline 
WA_WLMTD_STR-LFOR4 sy-vline 
WA_WLMTD_STR-KZMEHR sy-vline      INTO ld_text SEPARATED BY SPACE.

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