ABAP Select data from SAP table P21_LETILTAS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P21_LETILTAS 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 P21_LETILTAS. 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 P21_LETILTAS 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_P21_LETILTAS TYPE STANDARD TABLE OF P21_LETILTAS,
      WA_P21_LETILTAS TYPE P21_LETILTAS,
      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: <P21_LETILTAS> TYPE P21_LETILTAS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P21_LETILTAS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P21_LETILTAS
  INTO TABLE IT_P21_LETILTAS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P21_LETILTAS
*  INTO TABLE @DATA(IT_P21_LETILTAS2).
*--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_P21_LETILTAS INDEX 1 INTO DATA(WA_P21_LETILTAS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P21_LETILTAS ASSIGNING <P21_LETILTAS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P21_LETILTAS>-PERNR = 1.
<P21_LETILTAS>-ENAME = 1.
<P21_LETILTAS>-GBDAT = 1.
<P21_LETILTAS>-GBORT = 1.
<P21_LETILTAS>-BEGDA = 1.

ENDLOOP.

LOOP AT IT_P21_LETILTAS INTO WA_P21_LETILTAS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P21_LETILTAS-ENDDA, sy-vline,
  WA_P21_LETILTAS-PAPER, sy-vline,
  WA_P21_LETILTAS-KORABBI, sy-vline,
  WA_P21_LETILTAS-IT0308, sy-vline,
  WA_P21_LETILTAS-VFELF, sy-vline,
  WA_P21_LETILTAS-PFTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P21_LETILTAS 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_P21_LETILTAS 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_P21_LETILTAS INTO WA_P21_LETILTAS.


*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 GBDAT
CALL FUNCTION 'CONVERSION_EXIT_PDATE_OUTPUT'
  EXPORTING
    input =                      WA_P21_LETILTAS-GBDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_P21_LETILTAS-GBDAT.
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_P21_LETILTAS_STR, 
PERNR TYPE STRING,
ENAME TYPE STRING,
GBDAT TYPE STRING,
GBORT TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
PAPER TYPE STRING,
KORABBI TYPE STRING,
IT0308 TYPE STRING,
VFELF TYPE STRING,
PFTYP TYPE STRING,
PFBEZ TYPE STRING,
PFSTY TYPE STRING,
PFLGA TYPE STRING,
LGART TYPE STRING,
WAERS TYPE STRING,
KORSU TYPE STRING,
RESSU TYPE STRING,
PFPRP TYPE STRING,
PPROZ TYPE STRING,
PMINS TYPE STRING,
PMOSU TYPE STRING,
PKONT TYPE STRING,
PFREG TYPE STRING,
PFREG_TXT TYPE STRING,
EMFSL TYPE STRING,
EMFTX TYPE STRING,
BKPLZ TYPE STRING,
BKORT TYPE STRING,
STRAS TYPE STRING,
LOCAT TYPE STRING,
BANKS TYPE STRING,
BANKL TYPE STRING,
BANKN TYPE STRING,
ZWECK TYPE STRING,
ZLSCH TYPE STRING,
VEGRJ TYPE STRING,
LETJL TYPE STRING,
LETJL_TXT TYPE STRING,
SPLIT TYPE STRING,
PRIOT TYPE STRING,
KAMAT TYPE STRING,
KORKM TYPE STRING,
BET_T TYPE STRING,
BET_U TYPE STRING,
BET_H TYPE STRING,
BET_R TYPE STRING,
BET_Q TYPE STRING,
BTRTL TYPE STRING,
PERSK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P21_LETILTAS_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_P21_LETILTAS_STR-PERNR sy-vline 
WA_P21_LETILTAS_STR-ENAME sy-vline 
WA_P21_LETILTAS_STR-GBDAT sy-vline 
WA_P21_LETILTAS_STR-GBORT sy-vline 
WA_P21_LETILTAS_STR-BEGDA sy-vline 
WA_P21_LETILTAS_STR-ENDDA sy-vline 
WA_P21_LETILTAS_STR-PAPER sy-vline 
WA_P21_LETILTAS_STR-KORABBI sy-vline 
WA_P21_LETILTAS_STR-IT0308 sy-vline 
WA_P21_LETILTAS_STR-VFELF sy-vline 
WA_P21_LETILTAS_STR-PFTYP sy-vline 
WA_P21_LETILTAS_STR-PFBEZ sy-vline 
WA_P21_LETILTAS_STR-PFSTY sy-vline 
WA_P21_LETILTAS_STR-PFLGA sy-vline 
WA_P21_LETILTAS_STR-LGART sy-vline 
WA_P21_LETILTAS_STR-WAERS sy-vline 
WA_P21_LETILTAS_STR-KORSU sy-vline 
WA_P21_LETILTAS_STR-RESSU sy-vline 
WA_P21_LETILTAS_STR-PFPRP sy-vline 
WA_P21_LETILTAS_STR-PPROZ sy-vline 
WA_P21_LETILTAS_STR-PMINS sy-vline 
WA_P21_LETILTAS_STR-PMOSU sy-vline 
WA_P21_LETILTAS_STR-PKONT sy-vline 
WA_P21_LETILTAS_STR-PFREG sy-vline 
WA_P21_LETILTAS_STR-PFREG_TXT sy-vline 
WA_P21_LETILTAS_STR-EMFSL sy-vline 
WA_P21_LETILTAS_STR-EMFTX sy-vline 
WA_P21_LETILTAS_STR-BKPLZ sy-vline 
WA_P21_LETILTAS_STR-BKORT sy-vline 
WA_P21_LETILTAS_STR-STRAS sy-vline 
WA_P21_LETILTAS_STR-LOCAT sy-vline 
WA_P21_LETILTAS_STR-BANKS sy-vline 
WA_P21_LETILTAS_STR-BANKL sy-vline 
WA_P21_LETILTAS_STR-BANKN sy-vline 
WA_P21_LETILTAS_STR-ZWECK sy-vline 
WA_P21_LETILTAS_STR-ZLSCH sy-vline 
WA_P21_LETILTAS_STR-VEGRJ sy-vline 
WA_P21_LETILTAS_STR-LETJL sy-vline 
WA_P21_LETILTAS_STR-LETJL_TXT sy-vline 
WA_P21_LETILTAS_STR-SPLIT sy-vline 
WA_P21_LETILTAS_STR-PRIOT sy-vline 
WA_P21_LETILTAS_STR-KAMAT sy-vline 
WA_P21_LETILTAS_STR-KORKM sy-vline 
WA_P21_LETILTAS_STR-BET_T sy-vline 
WA_P21_LETILTAS_STR-BET_U sy-vline 
WA_P21_LETILTAS_STR-BET_H sy-vline 
WA_P21_LETILTAS_STR-BET_R sy-vline 
WA_P21_LETILTAS_STR-BET_Q sy-vline 
WA_P21_LETILTAS_STR-BTRTL sy-vline 
WA_P21_LETILTAS_STR-PERSK sy-vline      INTO ld_text SEPARATED BY SPACE.

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