ABAP Select data from SAP table WSLM_POS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WSLM_POS
*  INTO TABLE @DATA(IT_WSLM_POS2).
*--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_WSLM_POS INDEX 1 INTO DATA(WA_WSLM_POS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WSLM_POS>-ATTYP = 1.
<WSLM_POS>-SATNR = 1.
<WSLM_POS>-ABTNR = 1.
<WSLM_POS>-LAYVR = 1.
<WSLM_POS>-LNLGV = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WSLM_POS-LAYGR, sy-vline,
  WA_WSLM_POS-LMVER, sy-vline,
  WA_WSLM_POS-LMVAR, sy-vline,
  WA_WSLM_POS-SORF1, sy-vline,
  WA_WSLM_POS-FACIN, sy-vline,
  WA_WSLM_POS-SHELF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WSLM_POS 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_WSLM_POS 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_WSLM_POS INTO WA_WSLM_POS.


*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 MATN1, internal->external for field SATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WSLM_POS-SATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSLM_POS-SATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MELAY
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WSLM_POS-MELAY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSLM_POS-MELAY.
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_WSLM_POS_STR, 
ATTYP TYPE STRING,
SATNR TYPE STRING,
ABTNR TYPE STRING,
LAYVR TYPE STRING,
LNLGV TYPE STRING,
LAYGR TYPE STRING,
LMVER TYPE STRING,
LMVAR TYPE STRING,
SORF1 TYPE STRING,
FACIN TYPE STRING,
SHELF TYPE STRING,
MEVOR TYPE STRING,
MELAY TYPE STRING,
HPLGR TYPE STRING,
ASL_VNO TYPE STRING,
ASL_GNO TYPE STRING,
ASL_PNO TYPE STRING,
ASL_DATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WSLM_POS_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_WSLM_POS_STR-ATTYP sy-vline 
WA_WSLM_POS_STR-SATNR sy-vline 
WA_WSLM_POS_STR-ABTNR sy-vline 
WA_WSLM_POS_STR-LAYVR sy-vline 
WA_WSLM_POS_STR-LNLGV sy-vline 
WA_WSLM_POS_STR-LAYGR sy-vline 
WA_WSLM_POS_STR-LMVER sy-vline 
WA_WSLM_POS_STR-LMVAR sy-vline 
WA_WSLM_POS_STR-SORF1 sy-vline 
WA_WSLM_POS_STR-FACIN sy-vline 
WA_WSLM_POS_STR-SHELF sy-vline 
WA_WSLM_POS_STR-MEVOR sy-vline 
WA_WSLM_POS_STR-MELAY sy-vline 
WA_WSLM_POS_STR-HPLGR sy-vline 
WA_WSLM_POS_STR-ASL_VNO sy-vline 
WA_WSLM_POS_STR-ASL_GNO sy-vline 
WA_WSLM_POS_STR-ASL_PNO sy-vline 
WA_WSLM_POS_STR-ASL_DATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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