ABAP Select data from SAP table PKR_FORM_MEDI_LS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PKR_FORM_MEDI_LS
*  INTO TABLE @DATA(IT_PKR_FORM_MEDI_LS2).
*--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_PKR_FORM_MEDI_LS INDEX 1 INTO DATA(WA_PKR_FORM_MEDI_LS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PKR_FORM_MEDI_LS>-LSREG = 1.
<PKR_FORM_MEDI_LS>-LSEES = 1.
<PKR_FORM_MEDI_LS>-LSNUM = 1.
<PKR_FORM_MEDI_LS>-LSNAM = 1.
<PKR_FORM_MEDI_LS>-LSPCD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PKR_FORM_MEDI_LS-LSCNT, sy-vline,
  WA_PKR_FORM_MEDI_LS-LSCNC, sy-vline,
  WA_PKR_FORM_MEDI_LS-LSAMT, sy-vline,
  WA_PKR_FORM_MEDI_LS-LSAMC, sy-vline,
  WA_PKR_FORM_MEDI_LS-LSSPG, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_PKR_FORM_MEDI_LS 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_PKR_FORM_MEDI_LS 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_PKR_FORM_MEDI_LS INTO WA_PKR_FORM_MEDI_LS.


*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 REGNO, internal->external for field LSREG
CALL FUNCTION 'CONVERSION_EXIT_REGNO_OUTPUT'
  EXPORTING
    input =                      WA_PKR_FORM_MEDI_LS-LSREG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PKR_FORM_MEDI_LS-LSREG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit BZNUM, internal->external for field LSNUM
CALL FUNCTION 'CONVERSION_EXIT_BZNUM_OUTPUT'
  EXPORTING
    input =                      WA_PKR_FORM_MEDI_LS-LSNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PKR_FORM_MEDI_LS-LSNUM.
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_PKR_FORM_MEDI_LS_STR, 
LSREG TYPE STRING,
LSEES TYPE STRING,
LSNUM TYPE STRING,
LSNAM TYPE STRING,
LSPCD TYPE STRING,
LSCNT TYPE STRING,
LSCNC TYPE STRING,
LSAMT TYPE STRING,
LSAMC TYPE STRING,
LSSPG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PKR_FORM_MEDI_LS_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_PKR_FORM_MEDI_LS_STR-LSREG sy-vline 
WA_PKR_FORM_MEDI_LS_STR-LSEES sy-vline 
WA_PKR_FORM_MEDI_LS_STR-LSNUM sy-vline 
WA_PKR_FORM_MEDI_LS_STR-LSNAM sy-vline 
WA_PKR_FORM_MEDI_LS_STR-LSPCD sy-vline 
WA_PKR_FORM_MEDI_LS_STR-LSCNT sy-vline 
WA_PKR_FORM_MEDI_LS_STR-LSCNC sy-vline 
WA_PKR_FORM_MEDI_LS_STR-LSAMT sy-vline 
WA_PKR_FORM_MEDI_LS_STR-LSAMC sy-vline 
WA_PKR_FORM_MEDI_LS_STR-LSSPG sy-vline      INTO ld_text SEPARATED BY SPACE.

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