ABAP Select data from SAP table PAR_RELLB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PAR_RELLB
*  INTO TABLE @DATA(IT_PAR_RELLB2).
*--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_PAR_RELLB INDEX 1 INTO DATA(WA_PAR_RELLB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PAR_RELLB>-TIPRG = 1.
<PAR_RELLB>-CODMV = 1.
<PAR_RELLB>-CCUIL = 1.
<PAR_RELLB>-AGROP = 1.
<PAR_RELLB>-MDCON = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PAR_RELLB-FECON, sy-vline,
  WA_PAR_RELLB-FEDES, sy-vline,
  WA_PAR_RELLB-OBRAS, sy-vline,
  WA_PAR_RELLB-STBAJ, sy-vline,
  WA_PAR_RELLB-FEREN, sy-vline,
  WA_PAR_RELLB-RMPAC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PAR_RELLB 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_PAR_RELLB 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_PAR_RELLB INTO WA_PAR_RELLB.


*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 DEXPL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PAR_RELLB-DEXPL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PAR_RELLB-DEXPL.
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_PAR_RELLB_STR, 
TIPRG TYPE STRING,
CODMV TYPE STRING,
CCUIL TYPE STRING,
AGROP TYPE STRING,
MDCON TYPE STRING,
FECON TYPE STRING,
FEDES TYPE STRING,
OBRAS TYPE STRING,
STBAJ TYPE STRING,
FEREN TYPE STRING,
RMPAC TYPE STRING,
LIQDA TYPE STRING,
SUCUR TYPE STRING,
DEXPL TYPE STRING,
PTRAB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PAR_RELLB_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_PAR_RELLB_STR-TIPRG sy-vline 
WA_PAR_RELLB_STR-CODMV sy-vline 
WA_PAR_RELLB_STR-CCUIL sy-vline 
WA_PAR_RELLB_STR-AGROP sy-vline 
WA_PAR_RELLB_STR-MDCON sy-vline 
WA_PAR_RELLB_STR-FECON sy-vline 
WA_PAR_RELLB_STR-FEDES sy-vline 
WA_PAR_RELLB_STR-OBRAS sy-vline 
WA_PAR_RELLB_STR-STBAJ sy-vline 
WA_PAR_RELLB_STR-FEREN sy-vline 
WA_PAR_RELLB_STR-RMPAC sy-vline 
WA_PAR_RELLB_STR-LIQDA sy-vline 
WA_PAR_RELLB_STR-SUCUR sy-vline 
WA_PAR_RELLB_STR-DEXPL sy-vline 
WA_PAR_RELLB_STR-PTRAB sy-vline      INTO ld_text SEPARATED BY SPACE.

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