ABAP Select data from SAP table PRCT_HEAD_COM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PRCT_HEAD_COM
*  INTO TABLE @DATA(IT_PRCT_HEAD_COM2).
*--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_PRCT_HEAD_COM INDEX 1 INTO DATA(WA_PRCT_HEAD_COM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PRCT_HEAD_COM>-R3_KNUMV = 1.
<PRCT_HEAD_COM>-KAPPL = 1.
<PRCT_HEAD_COM>-KALSM = 1.
<PRCT_HEAD_COM>-VERSION = 1.
<PRCT_HEAD_COM>-WAERK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PRCT_HEAD_COM-HWAER, sy-vline,
  WA_PRCT_HEAD_COM-KURST, sy-vline,
  WA_PRCT_HEAD_COM-KURRF, sy-vline,
  WA_PRCT_HEAD_COM-KURRF_DAT, sy-vline,
  WA_PRCT_HEAD_COM-PRSDT, sy-vline,
  WA_PRCT_HEAD_COM-DOCTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PRCT_HEAD_COM 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_PRCT_HEAD_COM 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_PRCT_HEAD_COM INTO WA_PRCT_HEAD_COM.


*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 EXCRT, internal->external for field KURRF
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_PRCT_HEAD_COM-KURRF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PRCT_HEAD_COM-KURRF.
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_PRCT_HEAD_COM_STR, 
R3_KNUMV TYPE STRING,
KAPPL TYPE STRING,
KALSM TYPE STRING,
VERSION TYPE STRING,
WAERK TYPE STRING,
HWAER TYPE STRING,
KURST TYPE STRING,
KURRF TYPE STRING,
KURRF_DAT TYPE STRING,
PRSDT TYPE STRING,
DOCTYPE TYPE STRING,
KVEWE TYPE STRING,
BUSINESS_OBJ_TYPE TYPE STRING,
EXPIRING_CHECK_DATE TYPE STRING,
ATTR_NAME_VALUE TYPE STRING,
AUTHORITY_LEVEL_DISPLAY TYPE STRING,
AUTHORITY_LEVEL_EDIT TYPE STRING,
ONLY_SPEC_USAGE TYPE STRING,
PERFORM_TRACE TYPE STRING,
RETURN_DOC_INDICATOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PRCT_HEAD_COM_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_PRCT_HEAD_COM_STR-R3_KNUMV sy-vline 
WA_PRCT_HEAD_COM_STR-KAPPL sy-vline 
WA_PRCT_HEAD_COM_STR-KALSM sy-vline 
WA_PRCT_HEAD_COM_STR-VERSION sy-vline 
WA_PRCT_HEAD_COM_STR-WAERK sy-vline 
WA_PRCT_HEAD_COM_STR-HWAER sy-vline 
WA_PRCT_HEAD_COM_STR-KURST sy-vline 
WA_PRCT_HEAD_COM_STR-KURRF sy-vline 
WA_PRCT_HEAD_COM_STR-KURRF_DAT sy-vline 
WA_PRCT_HEAD_COM_STR-PRSDT sy-vline 
WA_PRCT_HEAD_COM_STR-DOCTYPE sy-vline 
WA_PRCT_HEAD_COM_STR-KVEWE sy-vline 
WA_PRCT_HEAD_COM_STR-BUSINESS_OBJ_TYPE sy-vline 
WA_PRCT_HEAD_COM_STR-EXPIRING_CHECK_DATE sy-vline 
WA_PRCT_HEAD_COM_STR-ATTR_NAME_VALUE sy-vline 
WA_PRCT_HEAD_COM_STR-AUTHORITY_LEVEL_DISPLAY sy-vline 
WA_PRCT_HEAD_COM_STR-AUTHORITY_LEVEL_EDIT sy-vline 
WA_PRCT_HEAD_COM_STR-ONLY_SPEC_USAGE sy-vline 
WA_PRCT_HEAD_COM_STR-PERFORM_TRACE sy-vline 
WA_PRCT_HEAD_COM_STR-RETURN_DOC_INDICATOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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