ABAP Select data from SAP table MDSTR_PG_TREE_STOCKS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDSTR_PG_TREE_STOCKS
*  INTO TABLE @DATA(IT_MDSTR_PG_TREE_STOCKS2).
*--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_MDSTR_PG_TREE_STOCKS INDEX 1 INTO DATA(WA_MDSTR_PG_TREE_STOCKS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDSTR_PG_TREE_STOCKS>-DATUM = 1.
<MDSTR_PG_TREE_STOCKS>-PGHST = 1.
<MDSTR_PG_TREE_STOCKS>-PRGRP = 1.
<MDSTR_PG_TREE_STOCKS>-WERKS = 1.
<MDSTR_PG_TREE_STOCKS>-NRMIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDSTR_PG_TREE_STOCKS-WEMIT, sy-vline,
  WA_MDSTR_PG_TREE_STOCKS-WRKTX, sy-vline,
  WA_MDSTR_PG_TREE_STOCKS-VSNDA, sy-vline,
  WA_MDSTR_PG_TREE_STOCKS-TXMIT, sy-vline,
  WA_MDSTR_PG_TREE_STOCKS-MEMIT, sy-vline,
  WA_MDSTR_PG_TREE_STOCKS-MSEHT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDSTR_PG_TREE_STOCKS 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_MDSTR_PG_TREE_STOCKS 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_MDSTR_PG_TREE_STOCKS INTO WA_MDSTR_PG_TREE_STOCKS.


*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 PRGRP
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MDSTR_PG_TREE_STOCKS-PRGRP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDSTR_PG_TREE_STOCKS-PRGRP.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MDSTR_PG_TREE_STOCKS-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDSTR_PG_TREE_STOCKS-MATNR.
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_MDSTR_PG_TREE_STOCKS_STR, 
DATUM TYPE STRING,
PGHST TYPE STRING,
PRGRP TYPE STRING,
WERKS TYPE STRING,
NRMIT TYPE STRING,
WEMIT TYPE STRING,
WRKTX TYPE STRING,
VSNDA TYPE STRING,
TXMIT TYPE STRING,
MEMIT TYPE STRING,
MSEHT TYPE STRING,
ANTEI TYPE STRING,
PRKOF TYPE STRING,
UMREF TYPE STRING,
MTART TYPE STRING,
PERKZ TYPE STRING,
PERIV TYPE STRING,
PGTYP TYPE STRING,
KPGZU TYPE STRING,
DISPO TYPE STRING,
FIXKZ TYPE STRING,
DISST TYPE STRING,
NODEKEY TYPE STRING,
STOCK TYPE STRING,
LABST TYPE STRING,
TRAME_DRP TYPE STRING,
UMLME TYPE STRING,
UMLME2 TYPE STRING,
TRAME TYPE STRING,
INSME TYPE STRING,
INSME2 TYPE STRING,
SPEME TYPE STRING,
SPEME2 TYPE STRING,
EINME TYPE STRING,
EINME2 TYPE STRING,
KLABS TYPE STRING,
RETME TYPE STRING,
KINSM TYPE STRING,
KINSM2 TYPE STRING,
KSPEM TYPE STRING,
KSPEM2 TYPE STRING,
KEINM TYPE STRING,
KEINM2 TYPE STRING,
SLLAB TYPE STRING,
SLINS TYPE STRING,
EISBE TYPE STRING,
MATNR TYPE STRING,
MATXT TYPE STRING,
MTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDSTR_PG_TREE_STOCKS_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_MDSTR_PG_TREE_STOCKS_STR-DATUM sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-PGHST sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-PRGRP sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-WERKS sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-NRMIT sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-WEMIT sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-WRKTX sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-VSNDA sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-TXMIT sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-MEMIT sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-MSEHT sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-ANTEI sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-PRKOF sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-UMREF sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-MTART sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-PERKZ sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-PERIV sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-PGTYP sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-KPGZU sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-DISPO sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-FIXKZ sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-DISST sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-NODEKEY sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-STOCK sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-LABST sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-TRAME_DRP sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-UMLME sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-UMLME2 sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-TRAME sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-INSME sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-INSME2 sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-SPEME sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-SPEME2 sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-EINME sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-EINME2 sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-KLABS sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-RETME sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-KINSM sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-KINSM2 sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-KSPEM sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-KSPEM2 sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-KEINM sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-KEINM2 sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-SLLAB sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-SLINS sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-EISBE sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-MATNR sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-MATXT sy-vline 
WA_MDSTR_PG_TREE_STOCKS_STR-MTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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