ABAP Select data from SAP table RKECHAR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKECHAR
*  INTO TABLE @DATA(IT_RKECHAR2).
*--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_RKECHAR INDEX 1 INTO DATA(WA_RKECHAR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKECHAR>-RKECHAR01 = 1.
<RKECHAR>-RKECHAR02 = 1.
<RKECHAR>-RKECHAR03 = 1.
<RKECHAR>-RKECHAR04 = 1.
<RKECHAR>-RKECHAR05 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKECHAR-RKECHAR06, sy-vline,
  WA_RKECHAR-RKECHAR07, sy-vline,
  WA_RKECHAR-RKECHAR08, sy-vline,
  WA_RKECHAR-RKECHAR09, sy-vline,
  WA_RKECHAR-RKECHAR10, sy-vline,
  WA_RKECHAR-RKECHAR11, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKECHAR 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_RKECHAR 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_RKECHAR INTO WA_RKECHAR.


*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_RKECHAR_STR, 
RKECHAR01 TYPE STRING,
RKECHAR02 TYPE STRING,
RKECHAR03 TYPE STRING,
RKECHAR04 TYPE STRING,
RKECHAR05 TYPE STRING,
RKECHAR06 TYPE STRING,
RKECHAR07 TYPE STRING,
RKECHAR08 TYPE STRING,
RKECHAR09 TYPE STRING,
RKECHAR10 TYPE STRING,
RKECHAR11 TYPE STRING,
RKECHAR12 TYPE STRING,
RKECHAR13 TYPE STRING,
RKECHAR14 TYPE STRING,
RKECHAR15 TYPE STRING,
RKECHAR16 TYPE STRING,
RKECHAR17 TYPE STRING,
RKECHAR18 TYPE STRING,
RKECHAR19 TYPE STRING,
RKECHAR20 TYPE STRING,
RKECHAR21 TYPE STRING,
RKECHAR22 TYPE STRING,
RKECHAR23 TYPE STRING,
RKECHAR24 TYPE STRING,
RKECHAR25 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKECHAR_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_RKECHAR_STR-RKECHAR01 sy-vline 
WA_RKECHAR_STR-RKECHAR02 sy-vline 
WA_RKECHAR_STR-RKECHAR03 sy-vline 
WA_RKECHAR_STR-RKECHAR04 sy-vline 
WA_RKECHAR_STR-RKECHAR05 sy-vline 
WA_RKECHAR_STR-RKECHAR06 sy-vline 
WA_RKECHAR_STR-RKECHAR07 sy-vline 
WA_RKECHAR_STR-RKECHAR08 sy-vline 
WA_RKECHAR_STR-RKECHAR09 sy-vline 
WA_RKECHAR_STR-RKECHAR10 sy-vline 
WA_RKECHAR_STR-RKECHAR11 sy-vline 
WA_RKECHAR_STR-RKECHAR12 sy-vline 
WA_RKECHAR_STR-RKECHAR13 sy-vline 
WA_RKECHAR_STR-RKECHAR14 sy-vline 
WA_RKECHAR_STR-RKECHAR15 sy-vline 
WA_RKECHAR_STR-RKECHAR16 sy-vline 
WA_RKECHAR_STR-RKECHAR17 sy-vline 
WA_RKECHAR_STR-RKECHAR18 sy-vline 
WA_RKECHAR_STR-RKECHAR19 sy-vline 
WA_RKECHAR_STR-RKECHAR20 sy-vline 
WA_RKECHAR_STR-RKECHAR21 sy-vline 
WA_RKECHAR_STR-RKECHAR22 sy-vline 
WA_RKECHAR_STR-RKECHAR23 sy-vline 
WA_RKECHAR_STR-RKECHAR24 sy-vline 
WA_RKECHAR_STR-RKECHAR25 sy-vline      INTO ld_text SEPARATED BY SPACE.

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