ABAP Select data from SAP table MMDA_PUR_S_PO_SCN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMDA_PUR_S_PO_SCN
*  INTO TABLE @DATA(IT_MMDA_PUR_S_PO_SCN2).
*--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_MMDA_PUR_S_PO_SCN INDEX 1 INTO DATA(WA_MMDA_PUR_S_PO_SCN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMDA_PUR_S_PO_SCN>-ROCANCEL = 1.
<MMDA_PUR_S_PO_SCN>-BWVORG = 1.
<MMDA_PUR_S_PO_SCN>-EBELN = 1.
<MMDA_PUR_S_PO_SCN>-EBELP = 1.
<MMDA_PUR_S_PO_SCN>-SCLDT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMDA_PUR_S_PO_SCN-SCLTM, sy-vline,
  WA_MMDA_PUR_S_PO_SCN-SCLNR, sy-vline,
  WA_MMDA_PUR_S_PO_SCN-CNFDT, sy-vline,
  WA_MMDA_PUR_S_PO_SCN-CNFTM, sy-vline,
  WA_MMDA_PUR_S_PO_SCN-CNFNR, sy-vline,
  WA_MMDA_PUR_S_PO_SCN-EBTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMDA_PUR_S_PO_SCN 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_MMDA_PUR_S_PO_SCN 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_MMDA_PUR_S_PO_SCN INTO WA_MMDA_PUR_S_PO_SCN.


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

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MMDA_PUR_S_PO_SCN-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PO_SCN-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_MMDA_PUR_S_PO_SCN_STR, 
ROCANCEL TYPE STRING,
BWVORG TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
SCLDT TYPE STRING,
SCLTM TYPE STRING,
SCLNR TYPE STRING,
CNFDT TYPE STRING,
CNFTM TYPE STRING,
CNFNR TYPE STRING,
EBTYP TYPE STRING,
SCLQTY TYPE STRING,
CNFQTY TYPE STRING,
OPNQTY TYPE STRING,
TTLQTY TYPE STRING,
MEINS TYPE STRING,
UMREZ TYPE STRING,
UMREN TYPE STRING,
TIMESTAMP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMDA_PUR_S_PO_SCN_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_MMDA_PUR_S_PO_SCN_STR-ROCANCEL sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-BWVORG sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-EBELN sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-EBELP sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-SCLDT sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-SCLTM sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-SCLNR sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-CNFDT sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-CNFTM sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-CNFNR sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-EBTYP sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-SCLQTY sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-CNFQTY sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-OPNQTY sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-TTLQTY sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-MEINS sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-UMREZ sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-UMREN sy-vline 
WA_MMDA_PUR_S_PO_SCN_STR-TIMESTAMP sy-vline      INTO ld_text SEPARATED BY SPACE.

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