ABAP Select data from SAP table CATS_OBJ into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CATS_OBJ 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_OBJ. 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_OBJ 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_OBJ TYPE STANDARD TABLE OF CATS_OBJ,
      WA_CATS_OBJ TYPE CATS_OBJ,
      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_OBJ> TYPE CATS_OBJ.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATS_OBJ
*  INTO TABLE @DATA(IT_CATS_OBJ2).
*--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_OBJ INDEX 1 INTO DATA(WA_CATS_OBJ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATS_OBJ>-SKOSTL = 1.
<CATS_OBJ>-LSTAR = 1.
<CATS_OBJ>-SEBELN = 1.
<CATS_OBJ>-SEBELP = 1.
<CATS_OBJ>-SPRZNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATS_OBJ-LSTNR, sy-vline,
  WA_CATS_OBJ-RKOSTL, sy-vline,
  WA_CATS_OBJ-RPROJ, sy-vline,
  WA_CATS_OBJ-RAUFNR, sy-vline,
  WA_CATS_OBJ-RNPLNR, sy-vline,
  WA_CATS_OBJ-RAUFPL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATS_OBJ 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_OBJ 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_OBJ INTO WA_CATS_OBJ.


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

*Conversion exit ALPHA, internal->external for field SEBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_OBJ-SEBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_OBJ-SEBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SPRZNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_OBJ-SPRZNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_OBJ-SPRZNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LSTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_OBJ-LSTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_OBJ-LSTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RKOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_OBJ-RKOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_OBJ-RKOSTL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field RPROJ
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_CATS_OBJ-RPROJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_OBJ-RPROJ.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RAUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_OBJ-RAUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_OBJ-RAUFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RNPLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_OBJ-RNPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_OBJ-RNPLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RKDAUF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_OBJ-RKDAUF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_OBJ-RKDAUF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RPRZNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_OBJ-RPRZNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_OBJ-RPRZNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GRANT_NBR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_OBJ-GRANT_NBR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_OBJ-GRANT_NBR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field S_GRANT_NBR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_OBJ-S_GRANT_NBR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_OBJ-S_GRANT_NBR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SERVICE_DOC_ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_OBJ-SERVICE_DOC_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_OBJ-SERVICE_DOC_ID.
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_CATS_OBJ_STR, 
SKOSTL TYPE STRING,
LSTAR TYPE STRING,
SEBELN TYPE STRING,
SEBELP TYPE STRING,
SPRZNR TYPE STRING,
LSTNR TYPE STRING,
RKOSTL TYPE STRING,
RPROJ TYPE STRING,
RAUFNR TYPE STRING,
RNPLNR TYPE STRING,
RAUFPL TYPE STRING,
RAPLZL TYPE STRING,
RKDAUF TYPE STRING,
RKDPOS TYPE STRING,
RKSTR TYPE STRING,
RPRZNR TYPE STRING,
PAOBJNR TYPE STRING,
FUND TYPE STRING,
FUNC_AREA TYPE STRING,
GRANT_NBR TYPE STRING,
S_FUND TYPE STRING,
S_FUNC_AREA TYPE STRING,
S_GRANT_NBR TYPE STRING,
BUDGET_PD TYPE STRING,
SBUDGET_PD TYPE STRING,
SERVICE_DOC_TYPE TYPE STRING,
SERVICE_DOC_ID TYPE STRING,
SERVICE_DOC_ITEM_ID TYPE STRING,
OVERTIMECAT TYPE STRING,
WORK_ITEM_ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATS_OBJ_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_OBJ_STR-SKOSTL sy-vline 
WA_CATS_OBJ_STR-LSTAR sy-vline 
WA_CATS_OBJ_STR-SEBELN sy-vline 
WA_CATS_OBJ_STR-SEBELP sy-vline 
WA_CATS_OBJ_STR-SPRZNR sy-vline 
WA_CATS_OBJ_STR-LSTNR sy-vline 
WA_CATS_OBJ_STR-RKOSTL sy-vline 
WA_CATS_OBJ_STR-RPROJ sy-vline 
WA_CATS_OBJ_STR-RAUFNR sy-vline 
WA_CATS_OBJ_STR-RNPLNR sy-vline 
WA_CATS_OBJ_STR-RAUFPL sy-vline 
WA_CATS_OBJ_STR-RAPLZL sy-vline 
WA_CATS_OBJ_STR-RKDAUF sy-vline 
WA_CATS_OBJ_STR-RKDPOS sy-vline 
WA_CATS_OBJ_STR-RKSTR sy-vline 
WA_CATS_OBJ_STR-RPRZNR sy-vline 
WA_CATS_OBJ_STR-PAOBJNR sy-vline 
WA_CATS_OBJ_STR-FUND sy-vline 
WA_CATS_OBJ_STR-FUNC_AREA sy-vline 
WA_CATS_OBJ_STR-GRANT_NBR sy-vline 
WA_CATS_OBJ_STR-S_FUND sy-vline 
WA_CATS_OBJ_STR-S_FUNC_AREA sy-vline 
WA_CATS_OBJ_STR-S_GRANT_NBR sy-vline 
WA_CATS_OBJ_STR-BUDGET_PD sy-vline 
WA_CATS_OBJ_STR-SBUDGET_PD sy-vline 
WA_CATS_OBJ_STR-SERVICE_DOC_TYPE sy-vline 
WA_CATS_OBJ_STR-SERVICE_DOC_ID sy-vline 
WA_CATS_OBJ_STR-SERVICE_DOC_ITEM_ID sy-vline 
WA_CATS_OBJ_STR-OVERTIMECAT sy-vline 
WA_CATS_OBJ_STR-WORK_ITEM_ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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