ABAP Select data from SAP table TKEPPLLEVS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TKEPPLLEVS
*  INTO TABLE @DATA(IT_TKEPPLLEVS2).
*--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_TKEPPLLEVS INDEX 1 INTO DATA(WA_TKEPPLLEVS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TKEPPLLEVS>-MANDT = 1.
<TKEPPLLEVS>-APPLCLASS = 1.
<TKEPPLLEVS>-SUBCLASS = 1.
<TKEPPLLEVS>-TABNAME = 1.
<TKEPPLLEVS>-PLLEV = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TKEPPLLEVS-FNAM, sy-vline,
  WA_TKEPPLLEVS-SUBNR, sy-vline,
  WA_TKEPPLLEVS-SIGN, sy-vline,
  WA_TKEPPLLEVS-OPT, sy-vline,
  WA_TKEPPLLEVS-LOW, sy-vline,
  WA_TKEPPLLEVS-HIGH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TKEPPLLEVS 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_TKEPPLLEVS 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_TKEPPLLEVS INTO WA_TKEPPLLEVS.


*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_TKEPPLLEVS_STR, 
MANDT TYPE STRING,
APPLCLASS TYPE STRING,
SUBCLASS TYPE STRING,
TABNAME TYPE STRING,
PLLEV TYPE STRING,
FNAM TYPE STRING,
SUBNR TYPE STRING,
SIGN TYPE STRING,
OPT TYPE STRING,
LOW TYPE STRING,
HIGH TYPE STRING,
SORT TYPE STRING,
MOD TYPE STRING,
VAR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TKEPPLLEVS_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_TKEPPLLEVS_STR-MANDT sy-vline 
WA_TKEPPLLEVS_STR-APPLCLASS sy-vline 
WA_TKEPPLLEVS_STR-SUBCLASS sy-vline 
WA_TKEPPLLEVS_STR-TABNAME sy-vline 
WA_TKEPPLLEVS_STR-PLLEV sy-vline 
WA_TKEPPLLEVS_STR-FNAM sy-vline 
WA_TKEPPLLEVS_STR-SUBNR sy-vline 
WA_TKEPPLLEVS_STR-SIGN sy-vline 
WA_TKEPPLLEVS_STR-OPT sy-vline 
WA_TKEPPLLEVS_STR-LOW sy-vline 
WA_TKEPPLLEVS_STR-HIGH sy-vline 
WA_TKEPPLLEVS_STR-SORT sy-vline 
WA_TKEPPLLEVS_STR-MOD sy-vline 
WA_TKEPPLLEVS_STR-VAR sy-vline      INTO ld_text SEPARATED BY SPACE.

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