ABAP Select data from SAP table PC2NARG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PC2NARG 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 PC2NARG. 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 PC2NARG 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_PC2NARG TYPE STANDARD TABLE OF PC2NARG,
      WA_PC2NARG TYPE PC2NARG,
      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: <PC2NARG> TYPE PC2NARG.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PC2NARG.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PC2NARG
  INTO TABLE IT_PC2NARG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PC2NARG
*  INTO TABLE @DATA(IT_PC2NARG2).
*--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_PC2NARG INDEX 1 INTO DATA(WA_PC2NARG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PC2NARG ASSIGNING <PC2NARG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PC2NARG>-ARGSP = 1.
<PC2NARG>-BEGDA = 1.
<PC2NARG>-ENDDA = 1.
<PC2NARG>-RGLTN = 1.
<PC2NARG>-NARGS = 1.

ENDLOOP.

LOOP AT IT_PC2NARG INTO WA_PC2NARG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PC2NARG-ESTAT, sy-vline,
  WA_PC2NARG-RSTAT, sy-vline,
  WA_PC2NARG-PSTAT, sy-vline,
  WA_PC2NARG-RPERB, sy-vline,
  WA_PC2NARG-RPERE, sy-vline,
  WA_PC2NARG-FPPER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PC2NARG 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_PC2NARG 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_PC2NARG INTO WA_PC2NARG.


*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_PC2NARG_STR, 
ARGSP TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
RGLTN TYPE STRING,
NARGS TYPE STRING,
ESTAT TYPE STRING,
RSTAT TYPE STRING,
PSTAT TYPE STRING,
RPERB TYPE STRING,
RPERE TYPE STRING,
FPPER TYPE STRING,
RFPWT TYPE STRING,
RFAMT TYPE STRING,
RKOFC TYPE STRING,
RGLTC TYPE STRING,
CTYPE TYPE STRING,
RGPCT TYPE STRING,
RGBAS TYPE STRING,
RCBAS TYPE STRING,
RGPTP TYPE STRING,
RCPTP TYPE STRING,
RPAMT TYPE STRING,
RGAMT TYPE STRING,
RRPCT TYPE STRING,
RRPTP TYPE STRING,
RRBAS TYPE STRING,
RRAMT TYPE STRING,
RPPCT TYPE STRING,
RPPTP TYPE STRING,
RPBAS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PC2NARG_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_PC2NARG_STR-ARGSP sy-vline 
WA_PC2NARG_STR-BEGDA sy-vline 
WA_PC2NARG_STR-ENDDA sy-vline 
WA_PC2NARG_STR-RGLTN sy-vline 
WA_PC2NARG_STR-NARGS sy-vline 
WA_PC2NARG_STR-ESTAT sy-vline 
WA_PC2NARG_STR-RSTAT sy-vline 
WA_PC2NARG_STR-PSTAT sy-vline 
WA_PC2NARG_STR-RPERB sy-vline 
WA_PC2NARG_STR-RPERE sy-vline 
WA_PC2NARG_STR-FPPER sy-vline 
WA_PC2NARG_STR-RFPWT sy-vline 
WA_PC2NARG_STR-RFAMT sy-vline 
WA_PC2NARG_STR-RKOFC sy-vline 
WA_PC2NARG_STR-RGLTC sy-vline 
WA_PC2NARG_STR-CTYPE sy-vline 
WA_PC2NARG_STR-RGPCT sy-vline 
WA_PC2NARG_STR-RGBAS sy-vline 
WA_PC2NARG_STR-RCBAS sy-vline 
WA_PC2NARG_STR-RGPTP sy-vline 
WA_PC2NARG_STR-RCPTP sy-vline 
WA_PC2NARG_STR-RPAMT sy-vline 
WA_PC2NARG_STR-RGAMT sy-vline 
WA_PC2NARG_STR-RRPCT sy-vline 
WA_PC2NARG_STR-RRPTP sy-vline 
WA_PC2NARG_STR-RRBAS sy-vline 
WA_PC2NARG_STR-RRAMT sy-vline 
WA_PC2NARG_STR-RPPCT sy-vline 
WA_PC2NARG_STR-RPPTP sy-vline 
WA_PC2NARG_STR-RPBAS sy-vline      INTO ld_text SEPARATED BY SPACE.

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