ABAP Select data from SAP table PC20G into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PC20G 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 PC20G. 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 PC20G 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_PC20G TYPE STANDARD TABLE OF PC20G,
      WA_PC20G TYPE PC20G,
      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: <PC20G> TYPE PC20G.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PC20G.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PC20G
  INTO TABLE IT_PC20G.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PC20G
*  INTO TABLE @DATA(IT_PC20G2).
*--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_PC20G INDEX 1 INTO DATA(WA_PC20G2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PC20G ASSIGNING <PC20G>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PC20G>-BUDAT = 1.
<PC20G>-AUFNR = 1.
<PC20G>-RUCKR = 1.
<PC20G>-RUCKZ = 1.
<PC20G>-ORIGF = 1.

ENDLOOP.

LOOP AT IT_PC20G INTO WA_PC20G.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PC20G-GRUNR, sy-vline,
  WA_PC20G-C1ZNR, sy-vline,
  WA_PC20G-LOARR, sy-vline,
  WA_PC20G-BETPE, sy-vline,
  WA_PC20G-BETRG, sy-vline,
  WA_PC20G-RUW01, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PC20G 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_PC20G 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_PC20G INTO WA_PC20G.


*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 AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PC20G-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PC20G-AUFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field RUE01
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PC20G-RUE01
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PC20G-RUE01.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VGE01
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PC20G-VGE01
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PC20G-VGE01.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field SOE01
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PC20G-SOE01
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PC20G-SOE01.
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_PC20G_STR, 
BUDAT TYPE STRING,
AUFNR TYPE STRING,
RUCKR TYPE STRING,
RUCKZ TYPE STRING,
ORIGF TYPE STRING,
GRUNR TYPE STRING,
C1ZNR TYPE STRING,
LOARR TYPE STRING,
BETPE TYPE STRING,
BETRG TYPE STRING,
RUW01 TYPE STRING,
RUE01 TYPE STRING,
VGW01 TYPE STRING,
VGE01 TYPE STRING,
SOW01 TYPE STRING,
SOE01 TYPE STRING,
LGRAD TYPE STRING,
RTE_CURR TYPE STRING,
AMT_CURR TYPE STRING,
GRUNA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PC20G_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_PC20G_STR-BUDAT sy-vline 
WA_PC20G_STR-AUFNR sy-vline 
WA_PC20G_STR-RUCKR sy-vline 
WA_PC20G_STR-RUCKZ sy-vline 
WA_PC20G_STR-ORIGF sy-vline 
WA_PC20G_STR-GRUNR sy-vline 
WA_PC20G_STR-C1ZNR sy-vline 
WA_PC20G_STR-LOARR sy-vline 
WA_PC20G_STR-BETPE sy-vline 
WA_PC20G_STR-BETRG sy-vline 
WA_PC20G_STR-RUW01 sy-vline 
WA_PC20G_STR-RUE01 sy-vline 
WA_PC20G_STR-VGW01 sy-vline 
WA_PC20G_STR-VGE01 sy-vline 
WA_PC20G_STR-SOW01 sy-vline 
WA_PC20G_STR-SOE01 sy-vline 
WA_PC20G_STR-LGRAD sy-vline 
WA_PC20G_STR-RTE_CURR sy-vline 
WA_PC20G_STR-AMT_CURR sy-vline 
WA_PC20G_STR-GRUNA sy-vline      INTO ld_text SEPARATED BY SPACE.

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