ABAP Select data from SAP table PEG_MDBS_SMALL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PEG_MDBS_SMALL
*  INTO TABLE @DATA(IT_PEG_MDBS_SMALL2).
*--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_PEG_MDBS_SMALL INDEX 1 INTO DATA(WA_PEG_MDBS_SMALL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PEG_MDBS_SMALL>-EBELN = 1.
<PEG_MDBS_SMALL>-EBELP = 1.
<PEG_MDBS_SMALL>-ETENR = 1.
<PEG_MDBS_SMALL>-MATNR = 1.
<PEG_MDBS_SMALL>-WERKS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PEG_MDBS_SMALL-UMREZ, sy-vline,
  WA_PEG_MDBS_SMALL-UMREN, sy-vline,
  WA_PEG_MDBS_SMALL-WEMNG, sy-vline,
  WA_PEG_MDBS_SMALL-MENGE, sy-vline,
  WA_PEG_MDBS_SMALL-ELIKZ, sy-vline,
  WA_PEG_MDBS_SMALL-PSPNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PEG_MDBS_SMALL 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_PEG_MDBS_SMALL 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_PEG_MDBS_SMALL INTO WA_PEG_MDBS_SMALL.


*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_PEG_MDBS_SMALL-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PEG_MDBS_SMALL-EBELN.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_PEG_MDBS_SMALL-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PEG_MDBS_SMALL-PSPNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field LMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PEG_MDBS_SMALL-LMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PEG_MDBS_SMALL-LMEIN.
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_PEG_MDBS_SMALL_STR, 
EBELN TYPE STRING,
EBELP TYPE STRING,
ETENR TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
UMREZ TYPE STRING,
UMREN TYPE STRING,
WEMNG TYPE STRING,
MENGE TYPE STRING,
ELIKZ TYPE STRING,
PSPNR TYPE STRING,
MEINS TYPE STRING,
LMEIN TYPE STRING,
RSNUM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PEG_MDBS_SMALL_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_PEG_MDBS_SMALL_STR-EBELN sy-vline 
WA_PEG_MDBS_SMALL_STR-EBELP sy-vline 
WA_PEG_MDBS_SMALL_STR-ETENR sy-vline 
WA_PEG_MDBS_SMALL_STR-MATNR sy-vline 
WA_PEG_MDBS_SMALL_STR-WERKS sy-vline 
WA_PEG_MDBS_SMALL_STR-UMREZ sy-vline 
WA_PEG_MDBS_SMALL_STR-UMREN sy-vline 
WA_PEG_MDBS_SMALL_STR-WEMNG sy-vline 
WA_PEG_MDBS_SMALL_STR-MENGE sy-vline 
WA_PEG_MDBS_SMALL_STR-ELIKZ sy-vline 
WA_PEG_MDBS_SMALL_STR-PSPNR sy-vline 
WA_PEG_MDBS_SMALL_STR-MEINS sy-vline 
WA_PEG_MDBS_SMALL_STR-LMEIN sy-vline 
WA_PEG_MDBS_SMALL_STR-RSNUM sy-vline      INTO ld_text SEPARATED BY SPACE.

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