ABAP Select data from SAP table LWMSM_LIKP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LWMSM_LIKP
*  INTO TABLE @DATA(IT_LWMSM_LIKP2).
*--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_LWMSM_LIKP INDEX 1 INTO DATA(WA_LWMSM_LIKP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LWMSM_LIKP>-VBELN = 1.
<LWMSM_LIKP>-ERNAM = 1.
<LWMSM_LIKP>-ERZET = 1.
<LWMSM_LIKP>-ERDAT = 1.
<LWMSM_LIKP>-BZIRK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LWMSM_LIKP-VSTEL, sy-vline,
  WA_LWMSM_LIKP-VKORG, sy-vline,
  WA_LWMSM_LIKP-LFART, sy-vline,
  WA_LWMSM_LIKP-WADAT, sy-vline,
  WA_LWMSM_LIKP-LDDAT, sy-vline,
  WA_LWMSM_LIKP-TDDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LWMSM_LIKP 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_LWMSM_LIKP 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_LWMSM_LIKP INTO WA_LWMSM_LIKP.


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

*Conversion exit TIMLO, internal->external for field ERZET
CALL FUNCTION 'CONVERSION_EXIT_TIMLO_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LIKP-ERZET
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LIKP-ERZET.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MODAT, internal->external for field ERDAT
CALL FUNCTION 'CONVERSION_EXIT_MODAT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LIKP-ERDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LIKP-ERDAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MODAT, internal->external for field WADAT
CALL FUNCTION 'CONVERSION_EXIT_MODAT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LIKP-WADAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LIKP-WADAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MODAT, internal->external for field LDDAT
CALL FUNCTION 'CONVERSION_EXIT_MODAT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LIKP-LDDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LIKP-LDDAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MODAT, internal->external for field TDDAT
CALL FUNCTION 'CONVERSION_EXIT_MODAT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LIKP-TDDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LIKP-TDDAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MODAT, internal->external for field LFDAT
CALL FUNCTION 'CONVERSION_EXIT_MODAT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LIKP-LFDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LIKP-LFDAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MODAT, internal->external for field KODAT
CALL FUNCTION 'CONVERSION_EXIT_MODAT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LIKP-KODAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LIKP-KODAT.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit TIMLO, internal->external for field LFUHR
CALL FUNCTION 'CONVERSION_EXIT_TIMLO_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LIKP-LFUHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LIKP-LFUHR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit TIMLO, internal->external for field TDUHR
CALL FUNCTION 'CONVERSION_EXIT_TIMLO_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LIKP-TDUHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LIKP-TDUHR.
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_LWMSM_LIKP_STR, 
VBELN TYPE STRING,
ERNAM TYPE STRING,
ERZET TYPE STRING,
ERDAT TYPE STRING,
BZIRK TYPE STRING,
VSTEL TYPE STRING,
VKORG TYPE STRING,
LFART TYPE STRING,
WADAT TYPE STRING,
LDDAT TYPE STRING,
TDDAT TYPE STRING,
LFDAT TYPE STRING,
KODAT TYPE STRING,
ABLAD TYPE STRING,
ROUTE TYPE STRING,
VBTYP TYPE STRING,
LPRIO TYPE STRING,
VSBED TYPE STRING,
KUNNR TYPE STRING,
KUNAG TYPE STRING,
KDGRP TYPE STRING,
ANZPK TYPE STRING,
LFUHR TYPE STRING,
LSTEL TYPE STRING,
LGNUM TYPE STRING,
LIFNR TYPE STRING,
TDUHR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LWMSM_LIKP_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_LWMSM_LIKP_STR-VBELN sy-vline 
WA_LWMSM_LIKP_STR-ERNAM sy-vline 
WA_LWMSM_LIKP_STR-ERZET sy-vline 
WA_LWMSM_LIKP_STR-ERDAT sy-vline 
WA_LWMSM_LIKP_STR-BZIRK sy-vline 
WA_LWMSM_LIKP_STR-VSTEL sy-vline 
WA_LWMSM_LIKP_STR-VKORG sy-vline 
WA_LWMSM_LIKP_STR-LFART sy-vline 
WA_LWMSM_LIKP_STR-WADAT sy-vline 
WA_LWMSM_LIKP_STR-LDDAT sy-vline 
WA_LWMSM_LIKP_STR-TDDAT sy-vline 
WA_LWMSM_LIKP_STR-LFDAT sy-vline 
WA_LWMSM_LIKP_STR-KODAT sy-vline 
WA_LWMSM_LIKP_STR-ABLAD sy-vline 
WA_LWMSM_LIKP_STR-ROUTE sy-vline 
WA_LWMSM_LIKP_STR-VBTYP sy-vline 
WA_LWMSM_LIKP_STR-LPRIO sy-vline 
WA_LWMSM_LIKP_STR-VSBED sy-vline 
WA_LWMSM_LIKP_STR-KUNNR sy-vline 
WA_LWMSM_LIKP_STR-KUNAG sy-vline 
WA_LWMSM_LIKP_STR-KDGRP sy-vline 
WA_LWMSM_LIKP_STR-ANZPK sy-vline 
WA_LWMSM_LIKP_STR-LFUHR sy-vline 
WA_LWMSM_LIKP_STR-LSTEL sy-vline 
WA_LWMSM_LIKP_STR-LGNUM sy-vline 
WA_LWMSM_LIKP_STR-LIFNR sy-vline 
WA_LWMSM_LIKP_STR-TDUHR sy-vline      INTO ld_text SEPARATED BY SPACE.

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