ABAP Select data from SAP table POWL_FIELDCAT_STY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM POWL_FIELDCAT_STY
*  INTO TABLE @DATA(IT_POWL_FIELDCAT_STY2).
*--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_POWL_FIELDCAT_STY INDEX 1 INTO DATA(WA_POWL_FIELDCAT_STY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<POWL_FIELDCAT_STY>-COLID = 1.
<POWL_FIELDCAT_STY>-COLPOS = 1.
<POWL_FIELDCAT_STY>-WIDTH = 1.
<POWL_FIELDCAT_STY>-HEADER = 1.
<POWL_FIELDCAT_STY>-HEADER_BY_DDIC = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_POWL_FIELDCAT_STY-HEADER_TEXT_WRAPPING, sy-vline,
  WA_POWL_FIELDCAT_STY-DISPLAY_TYPE, sy-vline,
  WA_POWL_FIELDCAT_STY-H_ALIGN, sy-vline,
  WA_POWL_FIELDCAT_STY-FIXED, sy-vline,
  WA_POWL_FIELDCAT_STY-TEXT, sy-vline,
  WA_POWL_FIELDCAT_STY-TEXT_REF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_POWL_FIELDCAT_STY 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_POWL_FIELDCAT_STY 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_POWL_FIELDCAT_STY INTO WA_POWL_FIELDCAT_STY.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_POWL_FIELDCAT_STY_STR, 
COLID TYPE STRING,
COLPOS TYPE STRING,
WIDTH TYPE STRING,
HEADER TYPE STRING,
HEADER_BY_DDIC TYPE STRING,
HEADER_TEXT_WRAPPING TYPE STRING,
DISPLAY_TYPE TYPE STRING,
H_ALIGN TYPE STRING,
FIXED TYPE STRING,
TEXT TYPE STRING,
TEXT_REF TYPE STRING,
EDITABLE TYPE STRING,
EDITABLE_REF TYPE STRING,
WRAPPING TYPE STRING,
WRAPPING_REF TYPE STRING,
ICON_SRC TYPE STRING,
ICON_SRC_REF TYPE STRING,
ICON_FIRST TYPE STRING,
ICON_FIRST_REF TYPE STRING,
CBOX_CHECK TYPE STRING,
CBOX_CHECK_REF TYPE STRING,
COL_VISIBLE TYPE STRING,
TECHNICAL_COL TYPE STRING,
ENABLED TYPE STRING,
ENABLED_REF TYPE STRING,
TOOLTIP TYPE STRING,
TOOLTIP_REF TYPE STRING,
ALLOW_FILTER TYPE STRING,
ALLOW_SORT TYPE STRING,
CQ TYPE STRING,
CQ_REF TYPE STRING,
SORT_REF TYPE STRING,
FILTER_REF TYPE STRING,
OVS_HANDLER_NAME TYPE STRING,
VALID_VALUES TYPE STRING,
DDIC_SHLP TYPE STRING,
PROGR_PERCENT TYPE STRING,
PROGR_PERCENT_REF TYPE STRING,
COLOR TYPE STRING,
COLOR_REF TYPE STRING,
SET_NULL TYPE STRING,
SET_NULL_REF TYPE STRING,
SORT_ORDER TYPE STRING,
NO_SORT_GROUP TYPE STRING,
NULL_AS_BLANK TYPE STRING,
PROGR_COLOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_POWL_FIELDCAT_STY_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_POWL_FIELDCAT_STY_STR-COLID sy-vline 
WA_POWL_FIELDCAT_STY_STR-COLPOS sy-vline 
WA_POWL_FIELDCAT_STY_STR-WIDTH sy-vline 
WA_POWL_FIELDCAT_STY_STR-HEADER sy-vline 
WA_POWL_FIELDCAT_STY_STR-HEADER_BY_DDIC sy-vline 
WA_POWL_FIELDCAT_STY_STR-HEADER_TEXT_WRAPPING sy-vline 
WA_POWL_FIELDCAT_STY_STR-DISPLAY_TYPE sy-vline 
WA_POWL_FIELDCAT_STY_STR-H_ALIGN sy-vline 
WA_POWL_FIELDCAT_STY_STR-FIXED sy-vline 
WA_POWL_FIELDCAT_STY_STR-TEXT sy-vline 
WA_POWL_FIELDCAT_STY_STR-TEXT_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-EDITABLE sy-vline 
WA_POWL_FIELDCAT_STY_STR-EDITABLE_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-WRAPPING sy-vline 
WA_POWL_FIELDCAT_STY_STR-WRAPPING_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-ICON_SRC sy-vline 
WA_POWL_FIELDCAT_STY_STR-ICON_SRC_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-ICON_FIRST sy-vline 
WA_POWL_FIELDCAT_STY_STR-ICON_FIRST_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-CBOX_CHECK sy-vline 
WA_POWL_FIELDCAT_STY_STR-CBOX_CHECK_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-COL_VISIBLE sy-vline 
WA_POWL_FIELDCAT_STY_STR-TECHNICAL_COL sy-vline 
WA_POWL_FIELDCAT_STY_STR-ENABLED sy-vline 
WA_POWL_FIELDCAT_STY_STR-ENABLED_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-TOOLTIP sy-vline 
WA_POWL_FIELDCAT_STY_STR-TOOLTIP_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-ALLOW_FILTER sy-vline 
WA_POWL_FIELDCAT_STY_STR-ALLOW_SORT sy-vline 
WA_POWL_FIELDCAT_STY_STR-CQ sy-vline 
WA_POWL_FIELDCAT_STY_STR-CQ_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-SORT_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-FILTER_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-OVS_HANDLER_NAME sy-vline 
WA_POWL_FIELDCAT_STY_STR-VALID_VALUES sy-vline 
WA_POWL_FIELDCAT_STY_STR-DDIC_SHLP sy-vline 
WA_POWL_FIELDCAT_STY_STR-PROGR_PERCENT sy-vline 
WA_POWL_FIELDCAT_STY_STR-PROGR_PERCENT_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-COLOR sy-vline 
WA_POWL_FIELDCAT_STY_STR-COLOR_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-SET_NULL sy-vline 
WA_POWL_FIELDCAT_STY_STR-SET_NULL_REF sy-vline 
WA_POWL_FIELDCAT_STY_STR-SORT_ORDER sy-vline 
WA_POWL_FIELDCAT_STY_STR-NO_SORT_GROUP sy-vline 
WA_POWL_FIELDCAT_STY_STR-NULL_AS_BLANK sy-vline 
WA_POWL_FIELDCAT_STY_STR-PROGR_COLOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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