ABAP Select data from SAP table RELULAKAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RELULAKAT
*  INTO TABLE @DATA(IT_RELULAKAT2).
*--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_RELULAKAT INDEX 1 INTO DATA(WA_RELULAKAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RELULAKAT>-MANDT = 1.
<RELULAKAT>-INTRENO = 1.
<RELULAKAT>-COUNTRY = 1.
<RELULAKAT>-STATE = 1.
<RELULAKAT>-SLIDENUM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RELULAKAT-CLASSIFICATION, sy-vline,
  WA_RELULAKAT-DVALIDFROM, sy-vline,
  WA_RELULAKAT-LOCATION, sy-vline,
  WA_RELULAKAT-AREA, sy-vline,
  WA_RELULAKAT-UNIT, sy-vline,
  WA_RELULAKAT-SURFACECAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RELULAKAT 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_RELULAKAT 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_RELULAKAT INTO WA_RELULAKAT.


*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 CUNIT, internal->external for field UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RELULAKAT-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RELULAKAT-UNIT.
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_RELULAKAT_STR, 
MANDT TYPE STRING,
INTRENO TYPE STRING,
COUNTRY TYPE STRING,
STATE TYPE STRING,
SLIDENUM TYPE STRING,
CLASSIFICATION TYPE STRING,
DVALIDFROM TYPE STRING,
LOCATION TYPE STRING,
AREA TYPE STRING,
UNIT TYPE STRING,
SURFACECAT TYPE STRING,
CONDLEV TYPE STRING,
SURFACETYP TYPE STRING,
EMZ TYPE STRING,
DVALIDTO TYPE STRING,
FARMLANDDIGIT TYPE STRING,
XMCLASS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RELULAKAT_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_RELULAKAT_STR-MANDT sy-vline 
WA_RELULAKAT_STR-INTRENO sy-vline 
WA_RELULAKAT_STR-COUNTRY sy-vline 
WA_RELULAKAT_STR-STATE sy-vline 
WA_RELULAKAT_STR-SLIDENUM sy-vline 
WA_RELULAKAT_STR-CLASSIFICATION sy-vline 
WA_RELULAKAT_STR-DVALIDFROM sy-vline 
WA_RELULAKAT_STR-LOCATION sy-vline 
WA_RELULAKAT_STR-AREA sy-vline 
WA_RELULAKAT_STR-UNIT sy-vline 
WA_RELULAKAT_STR-SURFACECAT sy-vline 
WA_RELULAKAT_STR-CONDLEV sy-vline 
WA_RELULAKAT_STR-SURFACETYP sy-vline 
WA_RELULAKAT_STR-EMZ sy-vline 
WA_RELULAKAT_STR-DVALIDTO sy-vline 
WA_RELULAKAT_STR-FARMLANDDIGIT sy-vline 
WA_RELULAKAT_STR-XMCLASS sy-vline      INTO ld_text SEPARATED BY SPACE.

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