ABAP Select data from SAP table CNFW_DISPLAY_ST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNFW_DISPLAY_ST
*  INTO TABLE @DATA(IT_CNFW_DISPLAY_ST2).
*--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_CNFW_DISPLAY_ST INDEX 1 INTO DATA(WA_CNFW_DISPLAY_ST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNFW_DISPLAY_ST>-L_S_OBJNR = 1.
<CNFW_DISPLAY_ST>-ICON = 1.
<CNFW_DISPLAY_ST>-AUFNR = 1.
<CNFW_DISPLAY_ST>-POST1 = 1.
<CNFW_DISPLAY_ST>-L_CELEMENT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNFW_DISPLAY_ST-L_STAGR, sy-vline,
  WA_CNFW_DISPLAY_ST-L_LEDNR, sy-vline,
  WA_CNFW_DISPLAY_ST-L_GJAHR, sy-vline,
  WA_CNFW_DISPLAY_ST-L_WRTTP, sy-vline,
  WA_CNFW_DISPLAY_ST-L_VERSN, sy-vline,
  WA_CNFW_DISPLAY_ST-L_HRKFT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNFW_DISPLAY_ST 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_CNFW_DISPLAY_ST 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_CNFW_DISPLAY_ST INTO WA_CNFW_DISPLAY_ST.


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

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

*Conversion exit GJAHR, internal->external for field L_GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_CNFW_DISPLAY_ST-L_GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNFW_DISPLAY_ST-L_GJAHR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit BEKNZ, internal->external for field L_BEKNZ
CALL FUNCTION 'CONVERSION_EXIT_BEKNZ_OUTPUT'
  EXPORTING
    input =                      WA_CNFW_DISPLAY_ST-L_BEKNZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNFW_DISPLAY_ST-L_BEKNZ.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit CUNIT, internal->external for field L_UOM_QTY
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CNFW_DISPLAY_ST-L_UOM_QTY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNFW_DISPLAY_ST-L_UOM_QTY.
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_CNFW_DISPLAY_ST_STR, 
L_S_OBJNR TYPE STRING,
ICON TYPE STRING,
AUFNR TYPE STRING,
POST1 TYPE STRING,
L_CELEMENT TYPE STRING,
L_STAGR TYPE STRING,
L_LEDNR TYPE STRING,
L_GJAHR TYPE STRING,
L_WRTTP TYPE STRING,
L_VERSN TYPE STRING,
L_HRKFT TYPE STRING,
L_VRGNG TYPE STRING,
L_PAROB TYPE STRING,
L_USPOB TYPE STRING,
L_BEKNZ TYPE STRING,
L_TWAER TYPE STRING,
L_PERBL TYPE STRING,
L_VBUND TYPE STRING,
L_PARGB TYPE STRING,
L_ADD_INFO TYPE STRING,
L_UOM_WORK TYPE STRING,
L_UOM_QTY TYPE STRING,
L_PLAN_WORK TYPE STRING,
L_PLAN_QTY TYPE STRING,
L_PLAN_COST_OBJ TYPE STRING,
L_PLAN_CURR_OBJ TYPE STRING,
L_PLAN_COST_COA TYPE STRING,
L_PLAN_CURR_COA TYPE STRING,
L_PLAN_RATE TYPE STRING,
L_ACTUAL_WORK TYPE STRING,
L_ACTUAL_COST TYPE STRING,
L_ACTUAL_QTY TYPE STRING,
L_AUTO_ACTL_COST TYPE STRING,
L_AUTO_REM_COST TYPE STRING,
L_AUTO_REM_WORK TYPE STRING,
L_AUTO_COST_COMPL TYPE STRING,
L_PAST_REM_WORK TYPE STRING,
L_PAST_REM_QTY TYPE STRING,
L_PAST_ACTL_COST TYPE STRING,
L_PAST_REM_COST TYPE STRING,
L_PAST_COMPL_COST TYPE STRING,
L_CURR_REM_WORK TYPE STRING,
L_CURR_ACTL_WORK TYPE STRING,
L_CURR_REM_QTY TYPE STRING,
L_CURR_ACTL_QTY TYPE STRING,
L_CURR_REM_COST TYPE STRING,
L_CURR_ACTL_COST TYPE STRING,
L_CURR_COMPL_COST TYPE STRING,
L_CURR_COMPL_QTY TYPE STRING,
L_CURR_RATE TYPE STRING,
L_CURR_COMPL_WORK TYPE STRING,
L_UPDATE TYPE STRING,
BELTP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNFW_DISPLAY_ST_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_CNFW_DISPLAY_ST_STR-L_S_OBJNR sy-vline 
WA_CNFW_DISPLAY_ST_STR-ICON sy-vline 
WA_CNFW_DISPLAY_ST_STR-AUFNR sy-vline 
WA_CNFW_DISPLAY_ST_STR-POST1 sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_CELEMENT sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_STAGR sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_LEDNR sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_GJAHR sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_WRTTP sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_VERSN sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_HRKFT sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_VRGNG sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PAROB sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_USPOB sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_BEKNZ sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_TWAER sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PERBL sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_VBUND sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PARGB sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_ADD_INFO sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_UOM_WORK sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_UOM_QTY sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PLAN_WORK sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PLAN_QTY sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PLAN_COST_OBJ sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PLAN_CURR_OBJ sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PLAN_COST_COA sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PLAN_CURR_COA sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PLAN_RATE sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_ACTUAL_WORK sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_ACTUAL_COST sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_ACTUAL_QTY sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_AUTO_ACTL_COST sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_AUTO_REM_COST sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_AUTO_REM_WORK sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_AUTO_COST_COMPL sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PAST_REM_WORK sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PAST_REM_QTY sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PAST_ACTL_COST sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PAST_REM_COST sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_PAST_COMPL_COST sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_CURR_REM_WORK sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_CURR_ACTL_WORK sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_CURR_REM_QTY sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_CURR_ACTL_QTY sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_CURR_REM_COST sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_CURR_ACTL_COST sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_CURR_COMPL_COST sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_CURR_COMPL_QTY sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_CURR_RATE sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_CURR_COMPL_WORK sy-vline 
WA_CNFW_DISPLAY_ST_STR-L_UPDATE sy-vline 
WA_CNFW_DISPLAY_ST_STR-BELTP sy-vline      INTO ld_text SEPARATED BY SPACE.

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