ABAP Select data from SAP table IWPC_CHARS_GEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IWPC_CHARS_GEN
*  INTO TABLE @DATA(IT_IWPC_CHARS_GEN2).
*--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_IWPC_CHARS_GEN INDEX 1 INTO DATA(WA_IWPC_CHARS_GEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IWPC_CHARS_GEN>-EQUNR = 1.
<IWPC_CHARS_GEN>-TPLNR = 1.
<IWPC_CHARS_GEN>-VERSN = 1.
<IWPC_CHARS_GEN>-GSBER = 1.
<IWPC_CHARS_GEN>-AUART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IWPC_CHARS_GEN-KOKRS, sy-vline,
  WA_IWPC_CHARS_GEN-KSTAR, sy-vline,
  WA_IWPC_CHARS_GEN-HRKFT, sy-vline,
  WA_IWPC_CHARS_GEN-TYPPS, sy-vline,
  WA_IWPC_CHARS_GEN-MENGE, sy-vline,
  WA_IWPC_CHARS_GEN-MEEHT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IWPC_CHARS_GEN 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_IWPC_CHARS_GEN 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_IWPC_CHARS_GEN INTO WA_IWPC_CHARS_GEN.


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

*Conversion exit TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_IWPC_CHARS_GEN-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IWPC_CHARS_GEN-TPLNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_IWPC_CHARS_GEN-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IWPC_CHARS_GEN-MATNR.
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_IWPC_CHARS_GEN_STR, 
EQUNR TYPE STRING,
TPLNR TYPE STRING,
VERSN TYPE STRING,
GSBER TYPE STRING,
AUART TYPE STRING,
KOKRS TYPE STRING,
KSTAR TYPE STRING,
HRKFT TYPE STRING,
TYPPS TYPE STRING,
MENGE TYPE STRING,
MEEHT TYPE STRING,
ARBID TYPE STRING,
KOSTL TYPE STRING,
LSTAR TYPE STRING,
MATNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IWPC_CHARS_GEN_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_IWPC_CHARS_GEN_STR-EQUNR sy-vline 
WA_IWPC_CHARS_GEN_STR-TPLNR sy-vline 
WA_IWPC_CHARS_GEN_STR-VERSN sy-vline 
WA_IWPC_CHARS_GEN_STR-GSBER sy-vline 
WA_IWPC_CHARS_GEN_STR-AUART sy-vline 
WA_IWPC_CHARS_GEN_STR-KOKRS sy-vline 
WA_IWPC_CHARS_GEN_STR-KSTAR sy-vline 
WA_IWPC_CHARS_GEN_STR-HRKFT sy-vline 
WA_IWPC_CHARS_GEN_STR-TYPPS sy-vline 
WA_IWPC_CHARS_GEN_STR-MENGE sy-vline 
WA_IWPC_CHARS_GEN_STR-MEEHT sy-vline 
WA_IWPC_CHARS_GEN_STR-ARBID sy-vline 
WA_IWPC_CHARS_GEN_STR-KOSTL sy-vline 
WA_IWPC_CHARS_GEN_STR-LSTAR sy-vline 
WA_IWPC_CHARS_GEN_STR-MATNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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