ABAP Select data from SAP table TCATS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TCATS
*  INTO TABLE @DATA(IT_TCATS2).
*--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_TCATS INDEX 1 INTO DATA(WA_TCATS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TCATS>-MANDT = 1.
<TCATS>-VARIANT = 1.
<TCATS>-CHANGABLE = 1.
<TCATS>-PERNRLIST = 1.
<TCATS>-MULTPER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TCATS-TIMECLERK, sy-vline,
  WA_TCATS-ORGOBJ, sy-vline,
  WA_TCATS-SELKOSTL, sy-vline,
  WA_TCATS-SELWORKPL, sy-vline,
  WA_TCATS-SELCUSTOM, sy-vline,
  WA_TCATS-PERTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TCATS 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_TCATS 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_TCATS INTO WA_TCATS.


*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_TCATS_STR, 
MANDT TYPE STRING,
VARIANT TYPE STRING,
CHANGABLE TYPE STRING,
PERNRLIST TYPE STRING,
MULTPER TYPE STRING,
TIMECLERK TYPE STRING,
ORGOBJ TYPE STRING,
SELKOSTL TYPE STRING,
SELWORKPL TYPE STRING,
SELCUSTOM TYPE STRING,
PERTYPE TYPE STRING,
CATSPERIOD TYPE STRING,
FIRSTDAYOF TYPE STRING,
PERLEFT TYPE STRING,
PERRIGHT TYPE STRING,
RELDATE TYPE STRING,
REJEBRIGHT TYPE STRING,
ADDINFOBRI TYPE STRING,
DAYTEXT TYPE STRING,
BRGRU TYPE STRING,
BEGEND TYPE STRING,
TARGETROW TYPE STRING,
TIMETYPE TYPE STRING,
SUBHRTIMES TYPE STRING,
UNDERTARGE TYPE STRING,
UNDERREACT TYPE STRING,
OVERTARGET TYPE STRING,
OVERREACT TYPE STRING,
SUMROW TYPE STRING,
CALENDAR TYPE STRING,
FUTURE TYPE STRING,
WORKLIST TYPE STRING,
ASSIGNED TYPE STRING,
WORKCENTRE TYPE STRING,
WORKING TYPE STRING,
WORKSINCE TYPE STRING,
FROMPOOL TYPE STRING,
FROMEXIT TYPE STRING,
WORKWITH TYPE STRING,
WF_APPR TYPE STRING,
FREEATSAVE TYPE STRING,
APPROVAL TYPE STRING,
DEFKOKRSCO TYPE STRING,
DEFCOSTCO TYPE STRING,
DEFCOSTCC TYPE STRING,
DEFACTTY TYPE STRING,
DEFPUROR TYPE STRING,
DEFLSTST TYPE STRING,
DEFATYPE TYPE STRING,
DEFAWART TYPE STRING,
DEFWTYPE TYPE STRING,
DEFLGART TYPE STRING,
TASK TYPE STRING,
KONTIREACT TYPE STRING,
KOLLIREACT TYPE STRING,
KOLHRREACT TYPE STRING,
MAXHRREACT TYPE STRING,
DIRECTHR TYPE STRING,
CATSPRINT TYPE STRING,
SELREPORT TYPE STRING,
HRCOSTASG TYPE STRING,
SELREP TYPE STRING,
CALENDAR_W TYPE STRING,
NOBREAKDED TYPE STRING,
ADDOVERTIME TYPE STRING,
WF_AUTO TYPE STRING,
NOCHANGE TYPE STRING,
SKIPISCR TYPE STRING,
DEFSPRZNR TYPE STRING,
CATSCELL_SIZE TYPE STRING,
T_SCHEMA TYPE STRING,
TEMPLATE TYPE STRING,
PERLOCK TYPE STRING,
EXC_GROUP TYPE STRING,
SPECIAL_APPROVAL TYPE STRING,
WORKCPRO TYPE STRING,
ASSIGNDB TYPE STRING,
CHECKASDB TYPE STRING,
HRENABLED TYPE STRING,
DATADISPLAY TYPE STRING,
CUTOFFDT TYPE STRING,
OFFSETPD TYPE STRING,
PUBLICHOLTY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TCATS_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_TCATS_STR-MANDT sy-vline 
WA_TCATS_STR-VARIANT sy-vline 
WA_TCATS_STR-CHANGABLE sy-vline 
WA_TCATS_STR-PERNRLIST sy-vline 
WA_TCATS_STR-MULTPER sy-vline 
WA_TCATS_STR-TIMECLERK sy-vline 
WA_TCATS_STR-ORGOBJ sy-vline 
WA_TCATS_STR-SELKOSTL sy-vline 
WA_TCATS_STR-SELWORKPL sy-vline 
WA_TCATS_STR-SELCUSTOM sy-vline 
WA_TCATS_STR-PERTYPE sy-vline 
WA_TCATS_STR-CATSPERIOD sy-vline 
WA_TCATS_STR-FIRSTDAYOF sy-vline 
WA_TCATS_STR-PERLEFT sy-vline 
WA_TCATS_STR-PERRIGHT sy-vline 
WA_TCATS_STR-RELDATE sy-vline 
WA_TCATS_STR-REJEBRIGHT sy-vline 
WA_TCATS_STR-ADDINFOBRI sy-vline 
WA_TCATS_STR-DAYTEXT sy-vline 
WA_TCATS_STR-BRGRU sy-vline 
WA_TCATS_STR-BEGEND sy-vline 
WA_TCATS_STR-TARGETROW sy-vline 
WA_TCATS_STR-TIMETYPE sy-vline 
WA_TCATS_STR-SUBHRTIMES sy-vline 
WA_TCATS_STR-UNDERTARGE sy-vline 
WA_TCATS_STR-UNDERREACT sy-vline 
WA_TCATS_STR-OVERTARGET sy-vline 
WA_TCATS_STR-OVERREACT sy-vline 
WA_TCATS_STR-SUMROW sy-vline 
WA_TCATS_STR-CALENDAR sy-vline 
WA_TCATS_STR-FUTURE sy-vline 
WA_TCATS_STR-WORKLIST sy-vline 
WA_TCATS_STR-ASSIGNED sy-vline 
WA_TCATS_STR-WORKCENTRE sy-vline 
WA_TCATS_STR-WORKING sy-vline 
WA_TCATS_STR-WORKSINCE sy-vline 
WA_TCATS_STR-FROMPOOL sy-vline 
WA_TCATS_STR-FROMEXIT sy-vline 
WA_TCATS_STR-WORKWITH sy-vline 
WA_TCATS_STR-WF_APPR sy-vline 
WA_TCATS_STR-FREEATSAVE sy-vline 
WA_TCATS_STR-APPROVAL sy-vline 
WA_TCATS_STR-DEFKOKRSCO sy-vline 
WA_TCATS_STR-DEFCOSTCO sy-vline 
WA_TCATS_STR-DEFCOSTCC sy-vline 
WA_TCATS_STR-DEFACTTY sy-vline 
WA_TCATS_STR-DEFPUROR sy-vline 
WA_TCATS_STR-DEFLSTST sy-vline 
WA_TCATS_STR-DEFATYPE sy-vline 
WA_TCATS_STR-DEFAWART sy-vline 
WA_TCATS_STR-DEFWTYPE sy-vline 
WA_TCATS_STR-DEFLGART sy-vline 
WA_TCATS_STR-TASK sy-vline 
WA_TCATS_STR-KONTIREACT sy-vline 
WA_TCATS_STR-KOLLIREACT sy-vline 
WA_TCATS_STR-KOLHRREACT sy-vline 
WA_TCATS_STR-MAXHRREACT sy-vline 
WA_TCATS_STR-DIRECTHR sy-vline 
WA_TCATS_STR-CATSPRINT sy-vline 
WA_TCATS_STR-SELREPORT sy-vline 
WA_TCATS_STR-HRCOSTASG sy-vline 
WA_TCATS_STR-SELREP sy-vline 
WA_TCATS_STR-CALENDAR_W sy-vline 
WA_TCATS_STR-NOBREAKDED sy-vline 
WA_TCATS_STR-ADDOVERTIME sy-vline 
WA_TCATS_STR-WF_AUTO sy-vline 
WA_TCATS_STR-NOCHANGE sy-vline 
WA_TCATS_STR-SKIPISCR sy-vline 
WA_TCATS_STR-DEFSPRZNR sy-vline 
WA_TCATS_STR-CATSCELL_SIZE sy-vline 
WA_TCATS_STR-T_SCHEMA sy-vline 
WA_TCATS_STR-TEMPLATE sy-vline 
WA_TCATS_STR-PERLOCK sy-vline 
WA_TCATS_STR-EXC_GROUP sy-vline 
WA_TCATS_STR-SPECIAL_APPROVAL sy-vline 
WA_TCATS_STR-WORKCPRO sy-vline 
WA_TCATS_STR-ASSIGNDB sy-vline 
WA_TCATS_STR-CHECKASDB sy-vline 
WA_TCATS_STR-HRENABLED sy-vline 
WA_TCATS_STR-DATADISPLAY sy-vline 
WA_TCATS_STR-CUTOFFDT sy-vline 
WA_TCATS_STR-OFFSETPD sy-vline 
WA_TCATS_STR-PUBLICHOLTY sy-vline      INTO ld_text SEPARATED BY SPACE.

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