ABAP Select data from SAP table RNNLEKX into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNNLEKX 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 RNNLEKX. 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 RNNLEKX 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_RNNLEKX TYPE STANDARD TABLE OF RNNLEKX,
      WA_RNNLEKX TYPE RNNLEKX,
      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: <RNNLEKX> TYPE RNNLEKX.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNNLEKX
*  INTO TABLE @DATA(IT_RNNLEKX2).
*--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_RNNLEKX INDEX 1 INTO DATA(WA_RNNLEKX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNNLEKX>-MANDT = 1.
<RNNLEKX>-EINRI = 1.
<RNNLEKX>-SEQNR = 1.
<RNNLEKX>-MARK = 1.
<RNNLEKX>-KSTYI = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNNLEKX-KSTYP, sy-vline,
  WA_RNNLEKX-KSART, sy-vline,
  WA_RNNLEKX-FALNR, sy-vline,
  WA_RNNLEKX-GPART, sy-vline,
  WA_RNNLEKX-DESCR, sy-vline,
  WA_RNNLEKX-DAT_FROM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNNLEKX 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_RNNLEKX 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_RNNLEKX INTO WA_RNNLEKX.


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

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

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

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

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

*Conversion exit ALPHA, internal->external for field GPART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNLEKX-GPART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNLEKX-GPART.
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_RNNLEKX_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
SEQNR TYPE STRING,
MARK TYPE STRING,
KSTYI TYPE STRING,
KSTYP TYPE STRING,
KSART TYPE STRING,
FALNR TYPE STRING,
GPART TYPE STRING,
DESCR TYPE STRING,
DAT_FROM TYPE STRING,
DAT_TO TYPE STRING,
BEHST TYPE STRING,
NEWCERT TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNNLEKX_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_RNNLEKX_STR-MANDT sy-vline 
WA_RNNLEKX_STR-EINRI sy-vline 
WA_RNNLEKX_STR-SEQNR sy-vline 
WA_RNNLEKX_STR-MARK sy-vline 
WA_RNNLEKX_STR-KSTYI sy-vline 
WA_RNNLEKX_STR-KSTYP sy-vline 
WA_RNNLEKX_STR-KSART sy-vline 
WA_RNNLEKX_STR-FALNR sy-vline 
WA_RNNLEKX_STR-GPART sy-vline 
WA_RNNLEKX_STR-DESCR sy-vline 
WA_RNNLEKX_STR-DAT_FROM sy-vline 
WA_RNNLEKX_STR-DAT_TO sy-vline 
WA_RNNLEKX_STR-BEHST sy-vline 
WA_RNNLEKX_STR-NEWCERT sy-vline 
WA_RNNLEKX_STR-ERDAT sy-vline 
WA_RNNLEKX_STR-ERUSR sy-vline 
WA_RNNLEKX_STR-UPDAT sy-vline 
WA_RNNLEKX_STR-UPUSR sy-vline 
WA_RNNLEKX_STR-STORN sy-vline 
WA_RNNLEKX_STR-STUSR sy-vline 
WA_RNNLEKX_STR-STDAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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