ABAP Select data from SAP table PC2G1 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PC2G1 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 PC2G1. 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 PC2G1 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_PC2G1 TYPE STANDARD TABLE OF PC2G1,
      WA_PC2G1 TYPE PC2G1,
      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: <PC2G1> TYPE PC2G1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PC2G1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PC2G1
  INTO TABLE IT_PC2G1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PC2G1
*  INTO TABLE @DATA(IT_PC2G12).
*--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_PC2G1 INDEX 1 INTO DATA(WA_PC2G12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PC2G1 ASSIGNING <PC2G1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PC2G1>-CNTR2 = 1.
<PC2G1>-BEGDA = 1.
<PC2G1>-ENDDA = 1.
<PC2G1>-TXUSE = 1.
<PC2G1>-TXARE = 1.

ENDLOOP.

LOOP AT IT_PC2G1 INTO WA_PC2G1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PC2G1-EETYP, sy-vline,
  WA_PC2G1-PRTCL, sy-vline,
  WA_PC2G1-SPCRL, sy-vline,
  WA_PC2G1-TXFLG, sy-vline,
  WA_PC2G1-EXEMT, sy-vline,
  WA_PC2G1-TAXID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PC2G1 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_PC2G1 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_PC2G1 INTO WA_PC2G1.


*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 GJAHR, internal->external for field TXYEA
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_PC2G1-TXYEA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PC2G1-TXYEA.
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_PC2G1_STR, 
CNTR2 TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
TXUSE TYPE STRING,
TXARE TYPE STRING,
EETYP TYPE STRING,
PRTCL TYPE STRING,
SPCRL TYPE STRING,
TXFLG TYPE STRING,
EXEMT TYPE STRING,
TAXID TYPE STRING,
TXGRP TYPE STRING,
TXPCT TYPE STRING,
TXACC TYPE STRING,
TXACY TYPE STRING,
EXPAM TYPE STRING,
EXPCY TYPE STRING,
TXBCT TYPE STRING,
TXBCC TYPE STRING,
TXBCY TYPE STRING,
INCM1 TYPE STRING,
INCM2 TYPE STRING,
INCM3 TYPE STRING,
INCM4 TYPE STRING,
TXSCT TYPE STRING,
TXSCC TYPE STRING,
TXSCY TYPE STRING,
TXVCT TYPE STRING,
TXVCC TYPE STRING,
TXVCY TYPE STRING,
PAYDT TYPE STRING,
TXSAG TYPE STRING,
TXYEG TYPE STRING,
TXSPG TYPE STRING,
TXCPG TYPE STRING,
TXCCT TYPE STRING,
TXCCC TYPE STRING,
TXCCY TYPE STRING,
TXERS TYPE STRING,
ERRAT TYPE STRING,
ERAMT TYPE STRING,
ERACU TYPE STRING,
ADDTX TYPE STRING,
TXCWS TYPE STRING,
EXRAT TYPE STRING,
TXIDB TYPE STRING,
IDBRT TYPE STRING,
TXICI TYPE STRING,
ICIRT TYPE STRING,
TXGRN TYPE STRING,
TAXGP TYPE STRING,
TXMON TYPE STRING,
TXYEA TYPE STRING,
EXPCL TYPE STRING,
EPRPS TYPE STRING,
PCTPS TYPE STRING,
ACCPS TYPE STRING,
ACYPS TYPE STRING,
TXCMN TYPE STRING,
TXERD TYPE STRING,
TXTMD TYPE STRING,
CURST TYPE STRING,
ENSTA TYPE STRING,
ENTDA TYPE STRING,
EMTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PC2G1_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_PC2G1_STR-CNTR2 sy-vline 
WA_PC2G1_STR-BEGDA sy-vline 
WA_PC2G1_STR-ENDDA sy-vline 
WA_PC2G1_STR-TXUSE sy-vline 
WA_PC2G1_STR-TXARE sy-vline 
WA_PC2G1_STR-EETYP sy-vline 
WA_PC2G1_STR-PRTCL sy-vline 
WA_PC2G1_STR-SPCRL sy-vline 
WA_PC2G1_STR-TXFLG sy-vline 
WA_PC2G1_STR-EXEMT sy-vline 
WA_PC2G1_STR-TAXID sy-vline 
WA_PC2G1_STR-TXGRP sy-vline 
WA_PC2G1_STR-TXPCT sy-vline 
WA_PC2G1_STR-TXACC sy-vline 
WA_PC2G1_STR-TXACY sy-vline 
WA_PC2G1_STR-EXPAM sy-vline 
WA_PC2G1_STR-EXPCY sy-vline 
WA_PC2G1_STR-TXBCT sy-vline 
WA_PC2G1_STR-TXBCC sy-vline 
WA_PC2G1_STR-TXBCY sy-vline 
WA_PC2G1_STR-INCM1 sy-vline 
WA_PC2G1_STR-INCM2 sy-vline 
WA_PC2G1_STR-INCM3 sy-vline 
WA_PC2G1_STR-INCM4 sy-vline 
WA_PC2G1_STR-TXSCT sy-vline 
WA_PC2G1_STR-TXSCC sy-vline 
WA_PC2G1_STR-TXSCY sy-vline 
WA_PC2G1_STR-TXVCT sy-vline 
WA_PC2G1_STR-TXVCC sy-vline 
WA_PC2G1_STR-TXVCY sy-vline 
WA_PC2G1_STR-PAYDT sy-vline 
WA_PC2G1_STR-TXSAG sy-vline 
WA_PC2G1_STR-TXYEG sy-vline 
WA_PC2G1_STR-TXSPG sy-vline 
WA_PC2G1_STR-TXCPG sy-vline 
WA_PC2G1_STR-TXCCT sy-vline 
WA_PC2G1_STR-TXCCC sy-vline 
WA_PC2G1_STR-TXCCY sy-vline 
WA_PC2G1_STR-TXERS sy-vline 
WA_PC2G1_STR-ERRAT sy-vline 
WA_PC2G1_STR-ERAMT sy-vline 
WA_PC2G1_STR-ERACU sy-vline 
WA_PC2G1_STR-ADDTX sy-vline 
WA_PC2G1_STR-TXCWS sy-vline 
WA_PC2G1_STR-EXRAT sy-vline 
WA_PC2G1_STR-TXIDB sy-vline 
WA_PC2G1_STR-IDBRT sy-vline 
WA_PC2G1_STR-TXICI sy-vline 
WA_PC2G1_STR-ICIRT sy-vline 
WA_PC2G1_STR-TXGRN sy-vline 
WA_PC2G1_STR-TAXGP sy-vline 
WA_PC2G1_STR-TXMON sy-vline 
WA_PC2G1_STR-TXYEA sy-vline 
WA_PC2G1_STR-EXPCL sy-vline 
WA_PC2G1_STR-EPRPS sy-vline 
WA_PC2G1_STR-PCTPS sy-vline 
WA_PC2G1_STR-ACCPS sy-vline 
WA_PC2G1_STR-ACYPS sy-vline 
WA_PC2G1_STR-TXCMN sy-vline 
WA_PC2G1_STR-TXERD sy-vline 
WA_PC2G1_STR-TXTMD sy-vline 
WA_PC2G1_STR-CURST sy-vline 
WA_PC2G1_STR-ENSTA sy-vline 
WA_PC2G1_STR-ENTDA sy-vline 
WA_PC2G1_STR-EMTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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