ABAP Select data from SAP table RCATSTXX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCATSTXX
*  INTO TABLE @DATA(IT_RCATSTXX2).
*--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_RCATSTXX INDEX 1 INTO DATA(WA_RCATSTXX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCATSTXX>-PARLCNT = 1.
<RCATSTXX>-PARHOUR = 1.
<RCATSTXX>-PARDATE = 1.
<RCATSTXX>-PARLIST = 1.
<RCATSTXX>-PARTEST = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCATSTXX-VAR_NORMAL, sy-vline,
  WA_RCATSTXX-VAR_RECEIVER, sy-vline,
  WA_RCATSTXX-VAR_SENDER, sy-vline,
  WA_RCATSTXX-VAR_ACTPA, sy-vline,
  WA_RCATSTXX-VAR_GEN_ACTALL, sy-vline,
  WA_RCATSTXX-TSSEL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCATSTXX 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_RCATSTXX 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_RCATSTXX INTO WA_RCATSTXX.


*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_RCATSTXX_STR, 
PARLCNT TYPE STRING,
PARHOUR TYPE STRING,
PARDATE TYPE STRING,
PARLIST TYPE STRING,
PARTEST TYPE STRING,
VAR_NORMAL TYPE STRING,
VAR_RECEIVER TYPE STRING,
VAR_SENDER TYPE STRING,
VAR_ACTPA TYPE STRING,
VAR_GEN_ACTALL TYPE STRING,
TSSEL TYPE STRING,
DOLIM TYPE STRING,
UPLIM TYPE STRING,
TOOFEW TYPE STRING,
TOOMANY TYPE STRING,
DISPALL TYPE STRING,
PER_CVR TYPE STRING,
TAR_CVR TYPE STRING,
MAIL TYPE STRING,
ALL_UNAPPROVED TYPE STRING,
REJECTION_MAIL TYPE STRING,
ALL_DAYS TYPE STRING,
REPEAT_TRANSFER TYPE STRING,
IGNORE_WARNING TYPE STRING,
SELDAILY TYPE STRING,
ARCH_TEST TYPE STRING,
ARCH_PROD TYPE STRING,
PARTASK TYPE STRING,
PARSTORN TYPE STRING,
PNR_CO TYPE STRING,
NO_APPROVAL TYPE STRING,
WITH_APPROVAL TYPE STRING,
SPECIAL_APPROVAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCATSTXX_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_RCATSTXX_STR-PARLCNT sy-vline 
WA_RCATSTXX_STR-PARHOUR sy-vline 
WA_RCATSTXX_STR-PARDATE sy-vline 
WA_RCATSTXX_STR-PARLIST sy-vline 
WA_RCATSTXX_STR-PARTEST sy-vline 
WA_RCATSTXX_STR-VAR_NORMAL sy-vline 
WA_RCATSTXX_STR-VAR_RECEIVER sy-vline 
WA_RCATSTXX_STR-VAR_SENDER sy-vline 
WA_RCATSTXX_STR-VAR_ACTPA sy-vline 
WA_RCATSTXX_STR-VAR_GEN_ACTALL sy-vline 
WA_RCATSTXX_STR-TSSEL sy-vline 
WA_RCATSTXX_STR-DOLIM sy-vline 
WA_RCATSTXX_STR-UPLIM sy-vline 
WA_RCATSTXX_STR-TOOFEW sy-vline 
WA_RCATSTXX_STR-TOOMANY sy-vline 
WA_RCATSTXX_STR-DISPALL sy-vline 
WA_RCATSTXX_STR-PER_CVR sy-vline 
WA_RCATSTXX_STR-TAR_CVR sy-vline 
WA_RCATSTXX_STR-MAIL sy-vline 
WA_RCATSTXX_STR-ALL_UNAPPROVED sy-vline 
WA_RCATSTXX_STR-REJECTION_MAIL sy-vline 
WA_RCATSTXX_STR-ALL_DAYS sy-vline 
WA_RCATSTXX_STR-REPEAT_TRANSFER sy-vline 
WA_RCATSTXX_STR-IGNORE_WARNING sy-vline 
WA_RCATSTXX_STR-SELDAILY sy-vline 
WA_RCATSTXX_STR-ARCH_TEST sy-vline 
WA_RCATSTXX_STR-ARCH_PROD sy-vline 
WA_RCATSTXX_STR-PARTASK sy-vline 
WA_RCATSTXX_STR-PARSTORN sy-vline 
WA_RCATSTXX_STR-PNR_CO sy-vline 
WA_RCATSTXX_STR-NO_APPROVAL sy-vline 
WA_RCATSTXX_STR-WITH_APPROVAL sy-vline 
WA_RCATSTXX_STR-SPECIAL_APPROVAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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