ABAP Select data from SAP table PUN_RSCHEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PUN_RSCHEADER
*  INTO TABLE @DATA(IT_PUN_RSCHEADER2).
*--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_PUN_RSCHEADER INDEX 1 INTO DATA(WA_PUN_RSCHEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PUN_RSCHEADER>-MONNS = 1.
<PUN_RSCHEADER>-TOTAL = 1.
<PUN_RSCHEADER>-INDTA = 1.
<PUN_RSCHEADER>-MONRT = 1.
<PUN_RSCHEADER>-DFEIR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PUN_RSCHEADER-RFPSC, sy-vline,
  WA_PUN_RSCHEADER-MAXRL, sy-vline,
  WA_PUN_RSCHEADER-FRENT, sy-vline,
  WA_PUN_RSCHEADER-RLITA, sy-vline,
  WA_PUN_RSCHEADER-EIPOA, sy-vline,
  WA_PUN_RSCHEADER-FOPOA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PUN_RSCHEADER 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_PUN_RSCHEADER 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_PUN_RSCHEADER INTO WA_PUN_RSCHEADER.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_PUN_RSCHEADER_STR, 
MONNS TYPE STRING,
TOTAL TYPE STRING,
INDTA TYPE STRING,
MONRT TYPE STRING,
DFEIR TYPE STRING,
RFPSC TYPE STRING,
MAXRL TYPE STRING,
FRENT TYPE STRING,
RLITA TYPE STRING,
EIPOA TYPE STRING,
FOPOA TYPE STRING,
RENTS TYPE STRING,
ANCRU TYPE STRING,
ANCRL TYPE STRING,
CURRN TYPE STRING,
BRFEE TYPE STRING,
BRCUR TYPE STRING,
RSMXP TYPE STRING,
RSPCN TYPE STRING,
RSDDT TYPE STRING,
RSDPN TYPE STRING,
PERNR TYPE STRING,
ANRED TYPE STRING,
NACHN TYPE STRING,
VORNA TYPE STRING,
MIDNM TYPE STRING,
NACH2 TYPE STRING,
INITS TYPE STRING,
NAME2 TYPE STRING,
FDATE TYPE STRING,
CNAME TYPE STRING,
INDTP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PUN_RSCHEADER_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_PUN_RSCHEADER_STR-MONNS sy-vline 
WA_PUN_RSCHEADER_STR-TOTAL sy-vline 
WA_PUN_RSCHEADER_STR-INDTA sy-vline 
WA_PUN_RSCHEADER_STR-MONRT sy-vline 
WA_PUN_RSCHEADER_STR-DFEIR sy-vline 
WA_PUN_RSCHEADER_STR-RFPSC sy-vline 
WA_PUN_RSCHEADER_STR-MAXRL sy-vline 
WA_PUN_RSCHEADER_STR-FRENT sy-vline 
WA_PUN_RSCHEADER_STR-RLITA sy-vline 
WA_PUN_RSCHEADER_STR-EIPOA sy-vline 
WA_PUN_RSCHEADER_STR-FOPOA sy-vline 
WA_PUN_RSCHEADER_STR-RENTS sy-vline 
WA_PUN_RSCHEADER_STR-ANCRU sy-vline 
WA_PUN_RSCHEADER_STR-ANCRL sy-vline 
WA_PUN_RSCHEADER_STR-CURRN sy-vline 
WA_PUN_RSCHEADER_STR-BRFEE sy-vline 
WA_PUN_RSCHEADER_STR-BRCUR sy-vline 
WA_PUN_RSCHEADER_STR-RSMXP sy-vline 
WA_PUN_RSCHEADER_STR-RSPCN sy-vline 
WA_PUN_RSCHEADER_STR-RSDDT sy-vline 
WA_PUN_RSCHEADER_STR-RSDPN sy-vline 
WA_PUN_RSCHEADER_STR-PERNR sy-vline 
WA_PUN_RSCHEADER_STR-ANRED sy-vline 
WA_PUN_RSCHEADER_STR-NACHN sy-vline 
WA_PUN_RSCHEADER_STR-VORNA sy-vline 
WA_PUN_RSCHEADER_STR-MIDNM sy-vline 
WA_PUN_RSCHEADER_STR-NACH2 sy-vline 
WA_PUN_RSCHEADER_STR-INITS sy-vline 
WA_PUN_RSCHEADER_STR-NAME2 sy-vline 
WA_PUN_RSCHEADER_STR-FDATE sy-vline 
WA_PUN_RSCHEADER_STR-CNAME sy-vline 
WA_PUN_RSCHEADER_STR-INDTP sy-vline      INTO ld_text SEPARATED BY SPACE.

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