ABAP Select data from SAP table ML4H_S_SIM_PDS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ML4H_S_SIM_PDS 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 ML4H_S_SIM_PDS. 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 ML4H_S_SIM_PDS 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_ML4H_S_SIM_PDS TYPE STANDARD TABLE OF ML4H_S_SIM_PDS,
      WA_ML4H_S_SIM_PDS TYPE ML4H_S_SIM_PDS,
      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: <ML4H_S_SIM_PDS> TYPE ML4H_S_SIM_PDS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_ML4H_S_SIM_PDS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM ML4H_S_SIM_PDS
  INTO TABLE IT_ML4H_S_SIM_PDS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ML4H_S_SIM_PDS
*  INTO TABLE @DATA(IT_ML4H_S_SIM_PDS2).
*--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_ML4H_S_SIM_PDS INDEX 1 INTO DATA(WA_ML4H_S_SIM_PDS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_ML4H_S_SIM_PDS ASSIGNING <ML4H_S_SIM_PDS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ML4H_S_SIM_PDS>-DOCREF_TMP = 1.
<ML4H_S_SIM_PDS>-KALNR = 1.
<ML4H_S_SIM_PDS>-CURTP = 1.
<ML4H_S_SIM_PDS>-JAHRPER = 1.
<ML4H_S_SIM_PDS>-CATEG = 1.

ENDLOOP.

LOOP AT IT_ML4H_S_SIM_PDS INTO WA_ML4H_S_SIM_PDS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ML4H_S_SIM_PDS-PTYP, sy-vline,
  WA_ML4H_S_SIM_PDS-BVALT, sy-vline,
  WA_ML4H_S_SIM_PDS-PROCESS, sy-vline,
  WA_ML4H_S_SIM_PDS-QUANT, sy-vline,
  WA_ML4H_S_SIM_PDS-MEINS, sy-vline,
  WA_ML4H_S_SIM_PDS-STVAL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ML4H_S_SIM_PDS 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_ML4H_S_SIM_PDS 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_ML4H_S_SIM_PDS INTO WA_ML4H_S_SIM_PDS.


*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 PERI7, internal->external for field JAHRPER
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_ML4H_S_SIM_PDS-JAHRPER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ML4H_S_SIM_PDS-JAHRPER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ML4H_S_SIM_PDS-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ML4H_S_SIM_PDS-MEINS.
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_ML4H_S_SIM_PDS_STR, 
DOCREF_TMP TYPE STRING,
KALNR TYPE STRING,
CURTP TYPE STRING,
JAHRPER TYPE STRING,
CATEG TYPE STRING,
PTYP TYPE STRING,
BVALT TYPE STRING,
PROCESS TYPE STRING,
QUANT TYPE STRING,
MEINS TYPE STRING,
STVAL TYPE STRING,
PRD TYPE STRING,
KDM TYPE STRING,
MARKUP TYPE STRING,
WAERS TYPE STRING,
XPLREL TYPE STRING,
PLQTY TYPE STRING,
XKDM_NACT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ML4H_S_SIM_PDS_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_ML4H_S_SIM_PDS_STR-DOCREF_TMP sy-vline 
WA_ML4H_S_SIM_PDS_STR-KALNR sy-vline 
WA_ML4H_S_SIM_PDS_STR-CURTP sy-vline 
WA_ML4H_S_SIM_PDS_STR-JAHRPER sy-vline 
WA_ML4H_S_SIM_PDS_STR-CATEG sy-vline 
WA_ML4H_S_SIM_PDS_STR-PTYP sy-vline 
WA_ML4H_S_SIM_PDS_STR-BVALT sy-vline 
WA_ML4H_S_SIM_PDS_STR-PROCESS sy-vline 
WA_ML4H_S_SIM_PDS_STR-QUANT sy-vline 
WA_ML4H_S_SIM_PDS_STR-MEINS sy-vline 
WA_ML4H_S_SIM_PDS_STR-STVAL sy-vline 
WA_ML4H_S_SIM_PDS_STR-PRD sy-vline 
WA_ML4H_S_SIM_PDS_STR-KDM sy-vline 
WA_ML4H_S_SIM_PDS_STR-MARKUP sy-vline 
WA_ML4H_S_SIM_PDS_STR-WAERS sy-vline 
WA_ML4H_S_SIM_PDS_STR-XPLREL sy-vline 
WA_ML4H_S_SIM_PDS_STR-PLQTY sy-vline 
WA_ML4H_S_SIM_PDS_STR-XKDM_NACT sy-vline      INTO ld_text SEPARATED BY SPACE.

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