ABAP Select data from SAP table CATS_CELL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATS_CELL
*  INTO TABLE @DATA(IT_CATS_CELL2).
*--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_CATS_CELL INDEX 1 INTO DATA(WA_CATS_CELL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATS_CELL>-CATSHOURS = 1.
<CATS_CELL>-BEGUZ = 1.
<CATS_CELL>-ENDUZ = 1.
<CATS_CELL>-VTKEN = 1.
<CATS_CELL>-ALLDF = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATS_CELL-OFMNW, sy-vline,
  WA_CATS_CELL-PEDD, sy-vline,
  WA_CATS_CELL-AUERU, sy-vline,
  WA_CATS_CELL-LTXA1, sy-vline,
  WA_CATS_CELL-LONGTEXT, sy-vline,
  WA_CATS_CELL-ERUZU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATS_CELL 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_CATS_CELL 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_CATS_CELL INTO WA_CATS_CELL.


*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_CATS_CELL_STR, 
CATSHOURS TYPE STRING,
BEGUZ TYPE STRING,
ENDUZ TYPE STRING,
VTKEN TYPE STRING,
ALLDF TYPE STRING,
OFMNW TYPE STRING,
PEDD TYPE STRING,
AUERU TYPE STRING,
LTXA1 TYPE STRING,
LONGTEXT TYPE STRING,
ERUZU TYPE STRING,
CATSAMOUNT TYPE STRING,
CATSQUANTITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATS_CELL_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_CATS_CELL_STR-CATSHOURS sy-vline 
WA_CATS_CELL_STR-BEGUZ sy-vline 
WA_CATS_CELL_STR-ENDUZ sy-vline 
WA_CATS_CELL_STR-VTKEN sy-vline 
WA_CATS_CELL_STR-ALLDF sy-vline 
WA_CATS_CELL_STR-OFMNW sy-vline 
WA_CATS_CELL_STR-PEDD sy-vline 
WA_CATS_CELL_STR-AUERU sy-vline 
WA_CATS_CELL_STR-LTXA1 sy-vline 
WA_CATS_CELL_STR-LONGTEXT sy-vline 
WA_CATS_CELL_STR-ERUZU sy-vline 
WA_CATS_CELL_STR-CATSAMOUNT sy-vline 
WA_CATS_CELL_STR-CATSQUANTITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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