ABAP Select data from SAP table CHARGEN_GN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CHARGEN_GN
*  INTO TABLE @DATA(IT_CHARGEN_GN2).
*--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_CHARGEN_GN INDEX 1 INTO DATA(WA_CHARGEN_GN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CHARGEN_GN>-RFBEL = 1.
<CHARGEN_GN>-RFPOS = 1.
<CHARGEN_GN>-VERURSYS = 1.
<CHARGEN_GN>-VUTYP = 1.
<CHARGEN_GN>-UECHA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CHARGEN_GN-CHARG, sy-vline,
  WA_CHARGEN_GN-KCMENG, sy-vline,
  WA_CHARGEN_GN-KCBRGEW, sy-vline,
  WA_CHARGEN_GN-KCNTGEW, sy-vline,
  WA_CHARGEN_GN-KCVOLUM, sy-vline,
  WA_CHARGEN_GN-KCGEWEI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CHARGEN_GN 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_CHARGEN_GN 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_CHARGEN_GN INTO WA_CHARGEN_GN.


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

*Conversion exit ALPHA, internal->external for field VERURSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CHARGEN_GN-VERURSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CHARGEN_GN-VERURSYS.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field KCVOLEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CHARGEN_GN-KCVOLEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CHARGEN_GN-KCVOLEH.
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_CHARGEN_GN_STR, 
RFBEL TYPE STRING,
RFPOS TYPE STRING,
VERURSYS TYPE STRING,
VUTYP TYPE STRING,
UECHA TYPE STRING,
CHARG TYPE STRING,
KCMENG TYPE STRING,
KCBRGEW TYPE STRING,
KCNTGEW TYPE STRING,
KCVOLUM TYPE STRING,
KCGEWEI TYPE STRING,
KCVOLEH TYPE STRING,
CHSPL TYPE STRING,
XCHPF TYPE STRING,
XCHAR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CHARGEN_GN_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_CHARGEN_GN_STR-RFBEL sy-vline 
WA_CHARGEN_GN_STR-RFPOS sy-vline 
WA_CHARGEN_GN_STR-VERURSYS sy-vline 
WA_CHARGEN_GN_STR-VUTYP sy-vline 
WA_CHARGEN_GN_STR-UECHA sy-vline 
WA_CHARGEN_GN_STR-CHARG sy-vline 
WA_CHARGEN_GN_STR-KCMENG sy-vline 
WA_CHARGEN_GN_STR-KCBRGEW sy-vline 
WA_CHARGEN_GN_STR-KCNTGEW sy-vline 
WA_CHARGEN_GN_STR-KCVOLUM sy-vline 
WA_CHARGEN_GN_STR-KCGEWEI sy-vline 
WA_CHARGEN_GN_STR-KCVOLEH sy-vline 
WA_CHARGEN_GN_STR-CHSPL sy-vline 
WA_CHARGEN_GN_STR-XCHPF sy-vline 
WA_CHARGEN_GN_STR-XCHAR sy-vline      INTO ld_text SEPARATED BY SPACE.

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