ABAP Select data from SAP table TKEP1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TKEP1 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 TKEP1. 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 TKEP1 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_TKEP1 TYPE STANDARD TABLE OF TKEP1,
      WA_TKEP1 TYPE TKEP1,
      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: <TKEP1> TYPE TKEP1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TKEP1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TKEP1
  INTO TABLE IT_TKEP1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TKEP1
*  INTO TABLE @DATA(IT_TKEP12).
*--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_TKEP1 INDEX 1 INTO DATA(WA_TKEP12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TKEP1 ASSIGNING <TKEP1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TKEP1>-MANDT = 1.
<TKEP1>-APPLCLASS = 1.
<TKEP1>-SUBCLASS = 1.
<TKEP1>-TABNAME = 1.
<TKEP1>-FORM = 1.

ENDLOOP.

LOOP AT IT_TKEP1 INTO WA_TKEP1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TKEP1-SUBNR, sy-vline,
  WA_TKEP1-ELNR1, sy-vline,
  WA_TKEP1-ELNR2, sy-vline,
  WA_TKEP1-PTYP, sy-vline,
  WA_TKEP1-RSUBNR, sy-vline,
  WA_TKEP1-RELNR1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TKEP1 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_TKEP1 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_TKEP1 INTO WA_TKEP1.


*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_TKEP1_STR, 
MANDT TYPE STRING,
APPLCLASS TYPE STRING,
SUBCLASS TYPE STRING,
TABNAME TYPE STRING,
FORM TYPE STRING,
SUBNR TYPE STRING,
ELNR1 TYPE STRING,
ELNR2 TYPE STRING,
PTYP TYPE STRING,
RSUBNR TYPE STRING,
RELNR1 TYPE STRING,
RELNR2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TKEP1_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_TKEP1_STR-MANDT sy-vline 
WA_TKEP1_STR-APPLCLASS sy-vline 
WA_TKEP1_STR-SUBCLASS sy-vline 
WA_TKEP1_STR-TABNAME sy-vline 
WA_TKEP1_STR-FORM sy-vline 
WA_TKEP1_STR-SUBNR sy-vline 
WA_TKEP1_STR-ELNR1 sy-vline 
WA_TKEP1_STR-ELNR2 sy-vline 
WA_TKEP1_STR-PTYP sy-vline 
WA_TKEP1_STR-RSUBNR sy-vline 
WA_TKEP1_STR-RELNR1 sy-vline 
WA_TKEP1_STR-RELNR2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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