ABAP Select data from SAP table PEG_MDBS into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PEG_MDBS 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. 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 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 TYPE STANDARD TABLE OF PEG_MDBS,
      WA_PEG_MDBS TYPE PEG_MDBS,
      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> TYPE PEG_MDBS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PEG_MDBS
*  INTO TABLE @DATA(IT_PEG_MDBS2).
*--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 INDEX 1 INTO DATA(WA_PEG_MDBS2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PEG_MDBS-WERKS, sy-vline,
  WA_PEG_MDBS-LGORT, sy-vline,
  WA_PEG_MDBS-BSTYP, sy-vline,
  WA_PEG_MDBS-LOEKZ, sy-vline,
  WA_PEG_MDBS-ELIKZ, sy-vline,
  WA_PEG_MDBS-MEINS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PEG_MDBS 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 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 INTO WA_PEG_MDBS.


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

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

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

*Conversion exit NUMCV, internal->external for field REVLV
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_PEG_MDBS-REVLV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PEG_MDBS-REVLV.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

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

*Conversion exit ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_PEG_MDBS-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PEG_MDBS-PSPNR.
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_STR, 
MANDT TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
ETENR TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
BSTYP TYPE STRING,
LOEKZ TYPE STRING,
ELIKZ TYPE STRING,
MEINS TYPE STRING,
UMREZ TYPE STRING,
UMREN TYPE STRING,
WEBAZ TYPE STRING,
PSTYP TYPE STRING,
KNTTP TYPE STRING,
SOBKZ TYPE STRING,
KZVBR TYPE STRING,
ETFZ1 TYPE STRING,
ETFZ2 TYPE STRING,
BSTAE TYPE STRING,
ARSNR TYPE STRING,
ARSPS TYPE STRING,
ETDRK TYPE STRING,
EINDT TYPE STRING,
MENGE TYPE STRING,
WEMNG TYPE STRING,
DABMG TYPE STRING,
WAMNG TYPE STRING,
GLMNG TYPE STRING,
QUNUM TYPE STRING,
QUPOS TYPE STRING,
RSNUM TYPE STRING,
ESTKZ TYPE STRING,
BEDAT TYPE STRING,
FIXKZ TYPE STRING,
SERNR TYPE STRING,
AMENG TYPE STRING,
REVLV TYPE STRING,
BWTAR TYPE STRING,
WEPOS TYPE STRING,
CHARG TYPE STRING,
AKTNR TYPE STRING,
RETPO TYPE STRING,
STATU TYPE STRING,
EMLIF TYPE STRING,
LBLKZ TYPE STRING,
EREKZ TYPE STRING,
KZBWS TYPE STRING,
EGLKZ TYPE STRING,
KZFIX TYPE STRING,
INSMK TYPE STRING,
STAPO TYPE STRING,
BERID TYPE STRING,
VERID TYPE STRING,
RESLO TYPE STRING,
UPTYP TYPE STRING,
PRIO_URG TYPE STRING,
PRIO_REQ TYPE STRING,
FLS_RSTO TYPE STRING,
NODISP TYPE STRING,
BANFN TYPE STRING,
BNFPO TYPE STRING,
ITCONS TYPE STRING,
FIXMG TYPE STRING,
MNG02 TYPE STRING,
UZEIT TYPE STRING,
SGT_SCAT TYPE STRING,
BPRME TYPE STRING,
SGT_RCAT TYPE STRING,
DISUB_SOBKZ TYPE STRING,
DISUB_PSPNR TYPE STRING,
DISUB_KUNNR TYPE STRING,
DISUB_VBELN TYPE STRING,
DISUB_POSNR TYPE STRING,
DISUB_OWNER TYPE STRING,
PSPNR TYPE STRING,
WRK2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PEG_MDBS_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_STR-MANDT sy-vline 
WA_PEG_MDBS_STR-EBELN sy-vline 
WA_PEG_MDBS_STR-EBELP sy-vline 
WA_PEG_MDBS_STR-ETENR sy-vline 
WA_PEG_MDBS_STR-MATNR sy-vline 
WA_PEG_MDBS_STR-WERKS sy-vline 
WA_PEG_MDBS_STR-LGORT sy-vline 
WA_PEG_MDBS_STR-BSTYP sy-vline 
WA_PEG_MDBS_STR-LOEKZ sy-vline 
WA_PEG_MDBS_STR-ELIKZ sy-vline 
WA_PEG_MDBS_STR-MEINS sy-vline 
WA_PEG_MDBS_STR-UMREZ sy-vline 
WA_PEG_MDBS_STR-UMREN sy-vline 
WA_PEG_MDBS_STR-WEBAZ sy-vline 
WA_PEG_MDBS_STR-PSTYP sy-vline 
WA_PEG_MDBS_STR-KNTTP sy-vline 
WA_PEG_MDBS_STR-SOBKZ sy-vline 
WA_PEG_MDBS_STR-KZVBR sy-vline 
WA_PEG_MDBS_STR-ETFZ1 sy-vline 
WA_PEG_MDBS_STR-ETFZ2 sy-vline 
WA_PEG_MDBS_STR-BSTAE sy-vline 
WA_PEG_MDBS_STR-ARSNR sy-vline 
WA_PEG_MDBS_STR-ARSPS sy-vline 
WA_PEG_MDBS_STR-ETDRK sy-vline 
WA_PEG_MDBS_STR-EINDT sy-vline 
WA_PEG_MDBS_STR-MENGE sy-vline 
WA_PEG_MDBS_STR-WEMNG sy-vline 
WA_PEG_MDBS_STR-DABMG sy-vline 
WA_PEG_MDBS_STR-WAMNG sy-vline 
WA_PEG_MDBS_STR-GLMNG sy-vline 
WA_PEG_MDBS_STR-QUNUM sy-vline 
WA_PEG_MDBS_STR-QUPOS sy-vline 
WA_PEG_MDBS_STR-RSNUM sy-vline 
WA_PEG_MDBS_STR-ESTKZ sy-vline 
WA_PEG_MDBS_STR-BEDAT sy-vline 
WA_PEG_MDBS_STR-FIXKZ sy-vline 
WA_PEG_MDBS_STR-SERNR sy-vline 
WA_PEG_MDBS_STR-AMENG sy-vline 
WA_PEG_MDBS_STR-REVLV sy-vline 
WA_PEG_MDBS_STR-BWTAR sy-vline 
WA_PEG_MDBS_STR-WEPOS sy-vline 
WA_PEG_MDBS_STR-CHARG sy-vline 
WA_PEG_MDBS_STR-AKTNR sy-vline 
WA_PEG_MDBS_STR-RETPO sy-vline 
WA_PEG_MDBS_STR-STATU sy-vline 
WA_PEG_MDBS_STR-EMLIF sy-vline 
WA_PEG_MDBS_STR-LBLKZ sy-vline 
WA_PEG_MDBS_STR-EREKZ sy-vline 
WA_PEG_MDBS_STR-KZBWS sy-vline 
WA_PEG_MDBS_STR-EGLKZ sy-vline 
WA_PEG_MDBS_STR-KZFIX sy-vline 
WA_PEG_MDBS_STR-INSMK sy-vline 
WA_PEG_MDBS_STR-STAPO sy-vline 
WA_PEG_MDBS_STR-BERID sy-vline 
WA_PEG_MDBS_STR-VERID sy-vline 
WA_PEG_MDBS_STR-RESLO sy-vline 
WA_PEG_MDBS_STR-UPTYP sy-vline 
WA_PEG_MDBS_STR-PRIO_URG sy-vline 
WA_PEG_MDBS_STR-PRIO_REQ sy-vline 
WA_PEG_MDBS_STR-FLS_RSTO sy-vline 
WA_PEG_MDBS_STR-NODISP sy-vline 
WA_PEG_MDBS_STR-BANFN sy-vline 
WA_PEG_MDBS_STR-BNFPO sy-vline 
WA_PEG_MDBS_STR-ITCONS sy-vline 
WA_PEG_MDBS_STR-FIXMG sy-vline 
WA_PEG_MDBS_STR-MNG02 sy-vline 
WA_PEG_MDBS_STR-UZEIT sy-vline 
WA_PEG_MDBS_STR-SGT_SCAT sy-vline 
WA_PEG_MDBS_STR-BPRME sy-vline 
WA_PEG_MDBS_STR-SGT_RCAT sy-vline 
WA_PEG_MDBS_STR-DISUB_SOBKZ sy-vline 
WA_PEG_MDBS_STR-DISUB_PSPNR sy-vline 
WA_PEG_MDBS_STR-DISUB_KUNNR sy-vline 
WA_PEG_MDBS_STR-DISUB_VBELN sy-vline 
WA_PEG_MDBS_STR-DISUB_POSNR sy-vline 
WA_PEG_MDBS_STR-DISUB_OWNER sy-vline 
WA_PEG_MDBS_STR-PSPNR sy-vline 
WA_PEG_MDBS_STR-WRK2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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