ABAP Select data from SAP table WTYGI_FCAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WTYGI_FCAT
*  INTO TABLE @DATA(IT_WTYGI_FCAT2).
*--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_WTYGI_FCAT INDEX 1 INTO DATA(WA_WTYGI_FCAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WTYGI_FCAT>-CLMNO = 1.
<WTYGI_FCAT>-CLMTY = 1.
<WTYGI_FCAT>-REFDT = 1.
<WTYGI_FCAT>-REFNO = 1.
<WTYGI_FCAT>-OLDCN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WTYGI_FCAT-AUTNO, sy-vline,
  WA_WTYGI_FCAT-AUTNA, sy-vline,
  WA_WTYGI_FCAT-RELTY, sy-vline,
  WA_WTYGI_FCAT-RELOB, sy-vline,
  WA_WTYGI_FCAT-RELOT, sy-vline,
  WA_WTYGI_FCAT-RELDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WTYGI_FCAT 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_WTYGI_FCAT 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_WTYGI_FCAT INTO WA_WTYGI_FCAT.


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

*Conversion exit ALPHA, internal->external for field OLDCN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WTYGI_FCAT-OLDCN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTYGI_FCAT-OLDCN.
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_WTYGI_FCAT_STR, 
CLMNO TYPE STRING,
CLMTY TYPE STRING,
REFDT TYPE STRING,
REFNO TYPE STRING,
OLDCN TYPE STRING,
AUTNO TYPE STRING,
AUTNA TYPE STRING,
RELTY TYPE STRING,
RELOB TYPE STRING,
RELOT TYPE STRING,
RELDT TYPE STRING,
ALTNUM TYPE STRING,
APPLOBJ_TYPE TYPE STRING,
CHNGBY TYPE STRING,
CHNGDAT TYPE STRING,
CHNGTIME TYPE STRING,
CREABY TYPE STRING,
CREADAT TYPE STRING,
TEXT TYPE STRING,
IS_LOCKED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WTYGI_FCAT_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_WTYGI_FCAT_STR-CLMNO sy-vline 
WA_WTYGI_FCAT_STR-CLMTY sy-vline 
WA_WTYGI_FCAT_STR-REFDT sy-vline 
WA_WTYGI_FCAT_STR-REFNO sy-vline 
WA_WTYGI_FCAT_STR-OLDCN sy-vline 
WA_WTYGI_FCAT_STR-AUTNO sy-vline 
WA_WTYGI_FCAT_STR-AUTNA sy-vline 
WA_WTYGI_FCAT_STR-RELTY sy-vline 
WA_WTYGI_FCAT_STR-RELOB sy-vline 
WA_WTYGI_FCAT_STR-RELOT sy-vline 
WA_WTYGI_FCAT_STR-RELDT sy-vline 
WA_WTYGI_FCAT_STR-ALTNUM sy-vline 
WA_WTYGI_FCAT_STR-APPLOBJ_TYPE sy-vline 
WA_WTYGI_FCAT_STR-CHNGBY sy-vline 
WA_WTYGI_FCAT_STR-CHNGDAT sy-vline 
WA_WTYGI_FCAT_STR-CHNGTIME sy-vline 
WA_WTYGI_FCAT_STR-CREABY sy-vline 
WA_WTYGI_FCAT_STR-CREADAT sy-vline 
WA_WTYGI_FCAT_STR-TEXT sy-vline 
WA_WTYGI_FCAT_STR-IS_LOCKED sy-vline      INTO ld_text SEPARATED BY SPACE.

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