ABAP Select data from SAP table CATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATA
*  INTO TABLE @DATA(IT_CATA2).
*--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_CATA INDEX 1 INTO DATA(WA_CATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATA>-ABLNR = 1.
<CATA>-ATYP = 1.
<CATA>-MODEL = 1.
<CATA>-APPL = 1.
<CATA>-SAPPL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATA-THST1, sy-vline,
  WA_CATA-THST2, sy-vline,
  WA_CATA-THST3, sy-vline,
  WA_CATA-THST4, sy-vline,
  WA_CATA-THST5, sy-vline,
  WA_CATA-IQ0NR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATA 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_CATA 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_CATA INTO WA_CATA.


*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 ISOLA, internal->external for field OSPRA
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CATA-OSPRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATA-OSPRA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAK
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CATA-SPRAK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATA-SPRAK.
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_CATA_STR, 
ABLNR TYPE STRING,
ATYP TYPE STRING,
MODEL TYPE STRING,
APPL TYPE STRING,
SAPPL TYPE STRING,
THST1 TYPE STRING,
THST2 TYPE STRING,
THST3 TYPE STRING,
THST4 TYPE STRING,
THST5 TYPE STRING,
IQ0NR TYPE STRING,
RVON TYPE STRING,
RBIS TYPE STRING,
SYST TYPE STRING,
MAND TYPE STRING,
LVORM TYPE STRING,
BATCH TYPE STRING,
FREIG TYPE STRING,
ABBRU TYPE STRING,
INAKT TYPE STRING,
EXCMD TYPE STRING,
OSPRA TYPE STRING,
ERFAS TYPE STRING,
ERDAT TYPE STRING,
AENDER TYPE STRING,
AEDAT TYPE STRING,
MUSER TYPE STRING,
PAIN01 TYPE STRING,
PAIN02 TYPE STRING,
PAIN03 TYPE STRING,
PAIN04 TYPE STRING,
PAIN05 TYPE STRING,
PAIN06 TYPE STRING,
PAIN07 TYPE STRING,
PAIN08 TYPE STRING,
PAIN09 TYPE STRING,
PAIN10 TYPE STRING,
PAIN11 TYPE STRING,
PAIN12 TYPE STRING,
PAIN13 TYPE STRING,
PAIN14 TYPE STRING,
PAIN15 TYPE STRING,
PAIN16 TYPE STRING,
PAIN17 TYPE STRING,
PAIN18 TYPE STRING,
PAIN19 TYPE STRING,
PAIN20 TYPE STRING,
AETIME TYPE STRING,
TFNAM TYPE STRING,
TFAEN TYPE STRING,
TFAED TYPE STRING,
TFAET TYPE STRING,
EKLAS TYPE STRING,
PRKNZ TYPE STRING,
PRNAM TYPE STRING,
PRDAT TYPE STRING,
PRTIM TYPE STRING,
PRSYS TYPE STRING,
PRMND TYPE STRING,
PRREL TYPE STRING,
KATEG TYPE STRING,
NUPLA TYPE STRING,
NUANW TYPE STRING,
NULAN TYPE STRING,
NUIND TYPE STRING,
NUHOT TYPE STRING,
ABFRO TYPE STRING,
ABPLA TYPE STRING,
ABSPR TYPE STRING,
ABLAN TYPE STRING,
ABKON TYPE STRING,
SPRAK TYPE STRING,
LANDK TYPE STRING,
KONTK TYPE STRING,
PRIOT TYPE STRING,
ZEITB TYPE STRING,
FGNAM TYPE STRING,
FGDAT TYPE STRING,
FGTIM TYPE STRING,
PAIN21 TYPE STRING,
PAIN22 TYPE STRING,
PAIN23 TYPE STRING,
PAIN24 TYPE STRING,
PAIN25 TYPE STRING,
PAIN26 TYPE STRING,
PAIN27 TYPE STRING,
PAIN28 TYPE STRING,
PAIN29 TYPE STRING,
PAIN30 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATA_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_CATA_STR-ABLNR sy-vline 
WA_CATA_STR-ATYP sy-vline 
WA_CATA_STR-MODEL sy-vline 
WA_CATA_STR-APPL sy-vline 
WA_CATA_STR-SAPPL sy-vline 
WA_CATA_STR-THST1 sy-vline 
WA_CATA_STR-THST2 sy-vline 
WA_CATA_STR-THST3 sy-vline 
WA_CATA_STR-THST4 sy-vline 
WA_CATA_STR-THST5 sy-vline 
WA_CATA_STR-IQ0NR sy-vline 
WA_CATA_STR-RVON sy-vline 
WA_CATA_STR-RBIS sy-vline 
WA_CATA_STR-SYST sy-vline 
WA_CATA_STR-MAND sy-vline 
WA_CATA_STR-LVORM sy-vline 
WA_CATA_STR-BATCH sy-vline 
WA_CATA_STR-FREIG sy-vline 
WA_CATA_STR-ABBRU sy-vline 
WA_CATA_STR-INAKT sy-vline 
WA_CATA_STR-EXCMD sy-vline 
WA_CATA_STR-OSPRA sy-vline 
WA_CATA_STR-ERFAS sy-vline 
WA_CATA_STR-ERDAT sy-vline 
WA_CATA_STR-AENDER sy-vline 
WA_CATA_STR-AEDAT sy-vline 
WA_CATA_STR-MUSER sy-vline 
WA_CATA_STR-PAIN01 sy-vline 
WA_CATA_STR-PAIN02 sy-vline 
WA_CATA_STR-PAIN03 sy-vline 
WA_CATA_STR-PAIN04 sy-vline 
WA_CATA_STR-PAIN05 sy-vline 
WA_CATA_STR-PAIN06 sy-vline 
WA_CATA_STR-PAIN07 sy-vline 
WA_CATA_STR-PAIN08 sy-vline 
WA_CATA_STR-PAIN09 sy-vline 
WA_CATA_STR-PAIN10 sy-vline 
WA_CATA_STR-PAIN11 sy-vline 
WA_CATA_STR-PAIN12 sy-vline 
WA_CATA_STR-PAIN13 sy-vline 
WA_CATA_STR-PAIN14 sy-vline 
WA_CATA_STR-PAIN15 sy-vline 
WA_CATA_STR-PAIN16 sy-vline 
WA_CATA_STR-PAIN17 sy-vline 
WA_CATA_STR-PAIN18 sy-vline 
WA_CATA_STR-PAIN19 sy-vline 
WA_CATA_STR-PAIN20 sy-vline 
WA_CATA_STR-AETIME sy-vline 
WA_CATA_STR-TFNAM sy-vline 
WA_CATA_STR-TFAEN sy-vline 
WA_CATA_STR-TFAED sy-vline 
WA_CATA_STR-TFAET sy-vline 
WA_CATA_STR-EKLAS sy-vline 
WA_CATA_STR-PRKNZ sy-vline 
WA_CATA_STR-PRNAM sy-vline 
WA_CATA_STR-PRDAT sy-vline 
WA_CATA_STR-PRTIM sy-vline 
WA_CATA_STR-PRSYS sy-vline 
WA_CATA_STR-PRMND sy-vline 
WA_CATA_STR-PRREL sy-vline 
WA_CATA_STR-KATEG sy-vline 
WA_CATA_STR-NUPLA sy-vline 
WA_CATA_STR-NUANW sy-vline 
WA_CATA_STR-NULAN sy-vline 
WA_CATA_STR-NUIND sy-vline 
WA_CATA_STR-NUHOT sy-vline 
WA_CATA_STR-ABFRO sy-vline 
WA_CATA_STR-ABPLA sy-vline 
WA_CATA_STR-ABSPR sy-vline 
WA_CATA_STR-ABLAN sy-vline 
WA_CATA_STR-ABKON sy-vline 
WA_CATA_STR-SPRAK sy-vline 
WA_CATA_STR-LANDK sy-vline 
WA_CATA_STR-KONTK sy-vline 
WA_CATA_STR-PRIOT sy-vline 
WA_CATA_STR-ZEITB sy-vline 
WA_CATA_STR-FGNAM sy-vline 
WA_CATA_STR-FGDAT sy-vline 
WA_CATA_STR-FGTIM sy-vline 
WA_CATA_STR-PAIN21 sy-vline 
WA_CATA_STR-PAIN22 sy-vline 
WA_CATA_STR-PAIN23 sy-vline 
WA_CATA_STR-PAIN24 sy-vline 
WA_CATA_STR-PAIN25 sy-vline 
WA_CATA_STR-PAIN26 sy-vline 
WA_CATA_STR-PAIN27 sy-vline 
WA_CATA_STR-PAIN28 sy-vline 
WA_CATA_STR-PAIN29 sy-vline 
WA_CATA_STR-PAIN30 sy-vline      INTO ld_text SEPARATED BY SPACE.

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