ABAP Select data from SAP table LWMSM_LTAK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LWMSM_LTAK 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_LTAK. 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_LTAK 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_LTAK TYPE STANDARD TABLE OF LWMSM_LTAK,
      WA_LWMSM_LTAK TYPE LWMSM_LTAK,
      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_LTAK> TYPE LWMSM_LTAK.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LWMSM_LTAK
*  INTO TABLE @DATA(IT_LWMSM_LTAK2).
*--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_LTAK INDEX 1 INTO DATA(WA_LWMSM_LTAK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LWMSM_LTAK>-LGNUM = 1.
<LWMSM_LTAK>-TANUM = 1.
<LWMSM_LTAK>-BWLVS = 1.
<LWMSM_LTAK>-BDATU = 1.
<LWMSM_LTAK>-BZEIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LWMSM_LTAK-BNAME, sy-vline,
  WA_LWMSM_LTAK-REFNR, sy-vline,
  WA_LWMSM_LTAK-TBNUM, sy-vline,
  WA_LWMSM_LTAK-VBELN, sy-vline,
  WA_LWMSM_LTAK-KQUIT, sy-vline,
  WA_LWMSM_LTAK-QDATU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LWMSM_LTAK 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_LTAK 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_LTAK INTO WA_LWMSM_LTAK.


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

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

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

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

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

*Conversion exit CUNIT, internal->external for field ZEIEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAK-ZEIEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAK-ZEIEI.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit TIMLO, internal->external for field STUZT
CALL FUNCTION 'CONVERSION_EXIT_TIMLO_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_LTAK-STUZT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_LTAK-STUZT.
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_LTAK_STR, 
LGNUM TYPE STRING,
TANUM TYPE STRING,
BWLVS TYPE STRING,
BDATU TYPE STRING,
BZEIT TYPE STRING,
BNAME TYPE STRING,
REFNR TYPE STRING,
TBNUM TYPE STRING,
VBELN TYPE STRING,
KQUIT TYPE STRING,
QDATU TYPE STRING,
PLDAT TYPE STRING,
SOLWM TYPE STRING,
ZEIEI TYPE STRING,
STDAT TYPE STRING,
STUZT TYPE STRING,
LGBZO TYPE STRING,
VBTYP TYPE STRING,
TAPRI TYPE STRING,
NOITM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LWMSM_LTAK_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_LTAK_STR-LGNUM sy-vline 
WA_LWMSM_LTAK_STR-TANUM sy-vline 
WA_LWMSM_LTAK_STR-BWLVS sy-vline 
WA_LWMSM_LTAK_STR-BDATU sy-vline 
WA_LWMSM_LTAK_STR-BZEIT sy-vline 
WA_LWMSM_LTAK_STR-BNAME sy-vline 
WA_LWMSM_LTAK_STR-REFNR sy-vline 
WA_LWMSM_LTAK_STR-TBNUM sy-vline 
WA_LWMSM_LTAK_STR-VBELN sy-vline 
WA_LWMSM_LTAK_STR-KQUIT sy-vline 
WA_LWMSM_LTAK_STR-QDATU sy-vline 
WA_LWMSM_LTAK_STR-PLDAT sy-vline 
WA_LWMSM_LTAK_STR-SOLWM sy-vline 
WA_LWMSM_LTAK_STR-ZEIEI sy-vline 
WA_LWMSM_LTAK_STR-STDAT sy-vline 
WA_LWMSM_LTAK_STR-STUZT sy-vline 
WA_LWMSM_LTAK_STR-LGBZO sy-vline 
WA_LWMSM_LTAK_STR-VBTYP sy-vline 
WA_LWMSM_LTAK_STR-TAPRI sy-vline 
WA_LWMSM_LTAK_STR-NOITM sy-vline      INTO ld_text SEPARATED BY SPACE.

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