ABAP Select data from SAP table EWULCTAB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EWULCTAB
*  INTO TABLE @DATA(IT_EWULCTAB2).
*--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_EWULCTAB INDEX 1 INTO DATA(WA_EWULCTAB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EWULCTAB>-KWFLG = 1.
<EWULCTAB>-HWFLG = 1.
<EWULCTAB>-TSFLG = 1.
<EWULCTAB>-IVFLG = 1.
<EWULCTAB>-EQFLG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EWULCTAB-ITFLG, sy-vline,
  WA_EWULCTAB-SUFLG, sy-vline,
  WA_EWULCTAB-HRFLG, sy-vline,
  WA_EWULCTAB-DPFLG, sy-vline,
  WA_EWULCTAB-LSFLG, sy-vline,
  WA_EWULCTAB-STFLG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EWULCTAB 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_EWULCTAB 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_EWULCTAB INTO WA_EWULCTAB.


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

*Conversion exit ALPHA, internal->external for field RLDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_EWULCTAB-RLDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EWULCTAB-RLDNR.
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_EWULCTAB_STR, 
KWFLG TYPE STRING,
HWFLG TYPE STRING,
TSFLG TYPE STRING,
IVFLG TYPE STRING,
EQFLG TYPE STRING,
ITFLG TYPE STRING,
SUFLG TYPE STRING,
HRFLG TYPE STRING,
DPFLG TYPE STRING,
LSFLG TYPE STRING,
STFLG TYPE STRING,
BWFLG TYPE STRING,
BPFLG TYPE STRING,
RCFLG TYPE STRING,
RDFLG TYPE STRING,
BGFLG TYPE STRING,
OLDVL TYPE STRING,
RCOMP TYPE STRING,
RLDNR TYPE STRING,
PAKET TYPE STRING,
RSFLG TYPE STRING,
RMFLG TYPE STRING,
DDFLG TYPE STRING,
BTFLG TYPE STRING,
KPFLG TYPE STRING,
GSFLG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EWULCTAB_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_EWULCTAB_STR-KWFLG sy-vline 
WA_EWULCTAB_STR-HWFLG sy-vline 
WA_EWULCTAB_STR-TSFLG sy-vline 
WA_EWULCTAB_STR-IVFLG sy-vline 
WA_EWULCTAB_STR-EQFLG sy-vline 
WA_EWULCTAB_STR-ITFLG sy-vline 
WA_EWULCTAB_STR-SUFLG sy-vline 
WA_EWULCTAB_STR-HRFLG sy-vline 
WA_EWULCTAB_STR-DPFLG sy-vline 
WA_EWULCTAB_STR-LSFLG sy-vline 
WA_EWULCTAB_STR-STFLG sy-vline 
WA_EWULCTAB_STR-BWFLG sy-vline 
WA_EWULCTAB_STR-BPFLG sy-vline 
WA_EWULCTAB_STR-RCFLG sy-vline 
WA_EWULCTAB_STR-RDFLG sy-vline 
WA_EWULCTAB_STR-BGFLG sy-vline 
WA_EWULCTAB_STR-OLDVL sy-vline 
WA_EWULCTAB_STR-RCOMP sy-vline 
WA_EWULCTAB_STR-RLDNR sy-vline 
WA_EWULCTAB_STR-PAKET sy-vline 
WA_EWULCTAB_STR-RSFLG sy-vline 
WA_EWULCTAB_STR-RMFLG sy-vline 
WA_EWULCTAB_STR-DDFLG sy-vline 
WA_EWULCTAB_STR-BTFLG sy-vline 
WA_EWULCTAB_STR-KPFLG sy-vline 
WA_EWULCTAB_STR-GSFLG sy-vline      INTO ld_text SEPARATED BY SPACE.

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