ABAP Select data from SAP table P0021_ABA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P0021_ABA 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 P0021_ABA. 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 P0021_ABA 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_P0021_ABA TYPE STANDARD TABLE OF P0021_ABA,
      WA_P0021_ABA TYPE P0021_ABA,
      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: <P0021_ABA> TYPE P0021_ABA.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P0021_ABA.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P0021_ABA
  INTO TABLE IT_P0021_ABA.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P0021_ABA
*  INTO TABLE @DATA(IT_P0021_ABA2).
*--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_P0021_ABA INDEX 1 INTO DATA(WA_P0021_ABA2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P0021_ABA ASSIGNING <P0021_ABA>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P0021_ABA>-PERNR = 1.
<P0021_ABA>-INFTY = 1.
<P0021_ABA>-SUBTY = 1.
<P0021_ABA>-OBJPS = 1.
<P0021_ABA>-SPRPS = 1.

ENDLOOP.

LOOP AT IT_P0021_ABA INTO WA_P0021_ABA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P0021_ABA-ENDDA, sy-vline,
  WA_P0021_ABA-BEGDA, sy-vline,
  WA_P0021_ABA-SEQNR, sy-vline,
  WA_P0021_ABA-AEDTM, sy-vline,
  WA_P0021_ABA-UNAME, sy-vline,
  WA_P0021_ABA-HISTO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P0021_ABA 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_P0021_ABA 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_P0021_ABA INTO WA_P0021_ABA.


*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 PDATE, internal->external for field FGBDT
CALL FUNCTION 'CONVERSION_EXIT_PDATE_OUTPUT'
  EXPORTING
    input =                      WA_P0021_ABA-FGBDT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_P0021_ABA-FGBDT.
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_P0021_ABA_STR, 
PERNR TYPE STRING,
INFTY TYPE STRING,
SUBTY TYPE STRING,
OBJPS TYPE STRING,
SPRPS TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
SEQNR TYPE STRING,
AEDTM TYPE STRING,
UNAME TYPE STRING,
HISTO TYPE STRING,
ITXEX TYPE STRING,
REFEX TYPE STRING,
ORDEX TYPE STRING,
ITBLD TYPE STRING,
PREAS TYPE STRING,
FLAG1 TYPE STRING,
FLAG2 TYPE STRING,
FLAG3 TYPE STRING,
FLAG4 TYPE STRING,
RESE1 TYPE STRING,
RESE2 TYPE STRING,
GRPVL TYPE STRING,
FAMSA TYPE STRING,
FGBDT TYPE STRING,
FGBLD TYPE STRING,
FANAT TYPE STRING,
FASEX TYPE STRING,
FAVOR TYPE STRING,
FANAM TYPE STRING,
FGBOT TYPE STRING,
FGDEP TYPE STRING,
ERBNR TYPE STRING,
FGBNA TYPE STRING,
FNAC2 TYPE STRING,
FCNAM TYPE STRING,
FKNZN TYPE STRING,
FINIT TYPE STRING,
FVRSW TYPE STRING,
FVRS2 TYPE STRING,
FNMZU TYPE STRING,
AHVNR TYPE STRING,
KDSVH TYPE STRING,
KDBSL TYPE STRING,
KDUTB TYPE STRING,
KDGBR TYPE STRING,
KDART TYPE STRING,
KDZUG TYPE STRING,
KDZUL TYPE STRING,
KDVBE TYPE STRING,
ERMNR TYPE STRING,
AUSVL TYPE STRING,
AUSVG TYPE STRING,
FASDT TYPE STRING,
FASAR TYPE STRING,
FASIN TYPE STRING,
EGAGA TYPE STRING,
FANA2 TYPE STRING,
FANA3 TYPE STRING,
BETRG TYPE STRING,
TITEL TYPE STRING,
EMRGN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P0021_ABA_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_P0021_ABA_STR-PERNR sy-vline 
WA_P0021_ABA_STR-INFTY sy-vline 
WA_P0021_ABA_STR-SUBTY sy-vline 
WA_P0021_ABA_STR-OBJPS sy-vline 
WA_P0021_ABA_STR-SPRPS sy-vline 
WA_P0021_ABA_STR-ENDDA sy-vline 
WA_P0021_ABA_STR-BEGDA sy-vline 
WA_P0021_ABA_STR-SEQNR sy-vline 
WA_P0021_ABA_STR-AEDTM sy-vline 
WA_P0021_ABA_STR-UNAME sy-vline 
WA_P0021_ABA_STR-HISTO sy-vline 
WA_P0021_ABA_STR-ITXEX sy-vline 
WA_P0021_ABA_STR-REFEX sy-vline 
WA_P0021_ABA_STR-ORDEX sy-vline 
WA_P0021_ABA_STR-ITBLD sy-vline 
WA_P0021_ABA_STR-PREAS sy-vline 
WA_P0021_ABA_STR-FLAG1 sy-vline 
WA_P0021_ABA_STR-FLAG2 sy-vline 
WA_P0021_ABA_STR-FLAG3 sy-vline 
WA_P0021_ABA_STR-FLAG4 sy-vline 
WA_P0021_ABA_STR-RESE1 sy-vline 
WA_P0021_ABA_STR-RESE2 sy-vline 
WA_P0021_ABA_STR-GRPVL sy-vline 
WA_P0021_ABA_STR-FAMSA sy-vline 
WA_P0021_ABA_STR-FGBDT sy-vline 
WA_P0021_ABA_STR-FGBLD sy-vline 
WA_P0021_ABA_STR-FANAT sy-vline 
WA_P0021_ABA_STR-FASEX sy-vline 
WA_P0021_ABA_STR-FAVOR sy-vline 
WA_P0021_ABA_STR-FANAM sy-vline 
WA_P0021_ABA_STR-FGBOT sy-vline 
WA_P0021_ABA_STR-FGDEP sy-vline 
WA_P0021_ABA_STR-ERBNR sy-vline 
WA_P0021_ABA_STR-FGBNA sy-vline 
WA_P0021_ABA_STR-FNAC2 sy-vline 
WA_P0021_ABA_STR-FCNAM sy-vline 
WA_P0021_ABA_STR-FKNZN sy-vline 
WA_P0021_ABA_STR-FINIT sy-vline 
WA_P0021_ABA_STR-FVRSW sy-vline 
WA_P0021_ABA_STR-FVRS2 sy-vline 
WA_P0021_ABA_STR-FNMZU sy-vline 
WA_P0021_ABA_STR-AHVNR sy-vline 
WA_P0021_ABA_STR-KDSVH sy-vline 
WA_P0021_ABA_STR-KDBSL sy-vline 
WA_P0021_ABA_STR-KDUTB sy-vline 
WA_P0021_ABA_STR-KDGBR sy-vline 
WA_P0021_ABA_STR-KDART sy-vline 
WA_P0021_ABA_STR-KDZUG sy-vline 
WA_P0021_ABA_STR-KDZUL sy-vline 
WA_P0021_ABA_STR-KDVBE sy-vline 
WA_P0021_ABA_STR-ERMNR sy-vline 
WA_P0021_ABA_STR-AUSVL sy-vline 
WA_P0021_ABA_STR-AUSVG sy-vline 
WA_P0021_ABA_STR-FASDT sy-vline 
WA_P0021_ABA_STR-FASAR sy-vline 
WA_P0021_ABA_STR-FASIN sy-vline 
WA_P0021_ABA_STR-EGAGA sy-vline 
WA_P0021_ABA_STR-FANA2 sy-vline 
WA_P0021_ABA_STR-FANA3 sy-vline 
WA_P0021_ABA_STR-BETRG sy-vline 
WA_P0021_ABA_STR-TITEL sy-vline 
WA_P0021_ABA_STR-EMRGN sy-vline      INTO ld_text SEPARATED BY SPACE.

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