ABAP Select data from SAP table CATQ into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATQ
*  INTO TABLE @DATA(IT_CATQ2).
*--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_CATQ INDEX 1 INTO DATA(WA_CATQ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATQ>-ABLNR = 1.
<CATQ>-PRDAT = 1.
<CATQ>-PRTIM = 1.
<CATQ>-VARNT = 1.
<CATQ>-PRKNZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATQ-PRNAM, sy-vline,
  WA_CATQ-PRSYS, sy-vline,
  WA_CATQ-PRMND, sy-vline,
  WA_CATQ-PRREL, sy-vline,
  WA_CATQ-ASPRA, sy-vline,
  WA_CATQ-LVORN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATQ 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_CATQ 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_CATQ INTO WA_CATQ.


*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 ASPRA
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CATQ-ASPRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATQ-ASPRA.
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_CATQ_STR, 
ABLNR TYPE STRING,
PRDAT TYPE STRING,
PRTIM TYPE STRING,
VARNT TYPE STRING,
PRKNZ TYPE STRING,
PRNAM TYPE STRING,
PRSYS TYPE STRING,
PRMND TYPE STRING,
PRREL TYPE STRING,
ASPRA TYPE STRING,
LVORN TYPE STRING,
LABLN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATQ_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_CATQ_STR-ABLNR sy-vline 
WA_CATQ_STR-PRDAT sy-vline 
WA_CATQ_STR-PRTIM sy-vline 
WA_CATQ_STR-VARNT sy-vline 
WA_CATQ_STR-PRKNZ sy-vline 
WA_CATQ_STR-PRNAM sy-vline 
WA_CATQ_STR-PRSYS sy-vline 
WA_CATQ_STR-PRMND sy-vline 
WA_CATQ_STR-PRREL sy-vline 
WA_CATQ_STR-ASPRA sy-vline 
WA_CATQ_STR-LVORN sy-vline 
WA_CATQ_STR-LABLN sy-vline      INTO ld_text SEPARATED BY SPACE.

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