ABAP Select data from SAP table KAPA_API04 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KAPA_API04 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 KAPA_API04. 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 KAPA_API04 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_KAPA_API04 TYPE STANDARD TABLE OF KAPA_API04,
      WA_KAPA_API04 TYPE KAPA_API04,
      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: <KAPA_API04> TYPE KAPA_API04.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KAPA_API04.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KAPA_API04
  INTO TABLE IT_KAPA_API04.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KAPA_API04
*  INTO TABLE @DATA(IT_KAPA_API042).
*--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_KAPA_API04 INDEX 1 INTO DATA(WA_KAPA_API042).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KAPA_API04 ASSIGNING <KAPA_API04>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KAPA_API04>-CANUM = 1.
<KAPA_API04>-VERSN = 1.
<KAPA_API04>-DATUB = 1.
<KAPA_API04>-TAGNR = 1.
<KAPA_API04>-SCHNR = 1.

ENDLOOP.

LOOP AT IT_KAPA_API04 INTO WA_KAPA_API04.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KAPA_API04-ANZHL, sy-vline,
  WA_KAPA_API04-BEGZT, sy-vline,
  WA_KAPA_API04-ENDZT, sy-vline,
  WA_KAPA_API04-PAUSE, sy-vline,
  WA_KAPA_API04-NGRAD, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_KAPA_API04 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_KAPA_API04 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_KAPA_API04 INTO WA_KAPA_API04.


*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_KAPA_API04_STR, 
CANUM TYPE STRING,
VERSN TYPE STRING,
DATUB TYPE STRING,
TAGNR TYPE STRING,
SCHNR TYPE STRING,
ANZHL TYPE STRING,
BEGZT TYPE STRING,
ENDZT TYPE STRING,
PAUSE TYPE STRING,
NGRAD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KAPA_API04_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_KAPA_API04_STR-CANUM sy-vline 
WA_KAPA_API04_STR-VERSN sy-vline 
WA_KAPA_API04_STR-DATUB sy-vline 
WA_KAPA_API04_STR-TAGNR sy-vline 
WA_KAPA_API04_STR-SCHNR sy-vline 
WA_KAPA_API04_STR-ANZHL sy-vline 
WA_KAPA_API04_STR-BEGZT sy-vline 
WA_KAPA_API04_STR-ENDZT sy-vline 
WA_KAPA_API04_STR-PAUSE sy-vline 
WA_KAPA_API04_STR-NGRAD sy-vline      INTO ld_text SEPARATED BY SPACE.

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