ABAP Select data from SAP table MC08TR2TK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MC08TR2TK 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 MC08TR2TK. 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 MC08TR2TK 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_MC08TR2TK TYPE STANDARD TABLE OF MC08TR2TK,
      WA_MC08TR2TK TYPE MC08TR2TK,
      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: <MC08TR2TK> TYPE MC08TR2TK.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MC08TR2TK.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MC08TR2TK
  INTO TABLE IT_MC08TR2TK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MC08TR2TK
*  INTO TABLE @DATA(IT_MC08TR2TK2).
*--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_MC08TR2TK INDEX 1 INTO DATA(WA_MC08TR2TK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MC08TR2TK ASSIGNING <MC08TR2TK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MC08TR2TK>-KNOTA = 1.
<MC08TR2TK>-KNOTZ = 1.
<MC08TR2TK>-KUNNA = 1.
<MC08TR2TK>-KUNNZ = 1.
<MC08TR2TK>-LIFNA = 1.

ENDLOOP.

LOOP AT IT_MC08TR2TK INTO WA_MC08TR2TK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MC08TR2TK-LIFNZ, sy-vline,
  WA_MC08TR2TK-LSTEL, sy-vline,
  WA_MC08TR2TK-LSTEZ, sy-vline,
  WA_MC08TR2TK-VSTEL, sy-vline,
  WA_MC08TR2TK-VSTEZ, sy-vline,
  WA_MC08TR2TK-WERKA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MC08TR2TK 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_MC08TR2TK 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_MC08TR2TK INTO WA_MC08TR2TK.


*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 KUNNA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC08TR2TK-KUNNA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC08TR2TK-KUNNA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNZ
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC08TR2TK-KUNNZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC08TR2TK-KUNNZ.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC08TR2TK-LIFNA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC08TR2TK-LIFNA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNZ
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC08TR2TK-LIFNZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC08TR2TK-LIFNZ.
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_MC08TR2TK_STR, 
KNOTA TYPE STRING,
KNOTZ TYPE STRING,
KUNNA TYPE STRING,
KUNNZ TYPE STRING,
LIFNA TYPE STRING,
LIFNZ TYPE STRING,
LSTEL TYPE STRING,
LSTEZ TYPE STRING,
VSTEL TYPE STRING,
VSTEZ TYPE STRING,
WERKA TYPE STRING,
WERKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MC08TR2TK_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_MC08TR2TK_STR-KNOTA sy-vline 
WA_MC08TR2TK_STR-KNOTZ sy-vline 
WA_MC08TR2TK_STR-KUNNA sy-vline 
WA_MC08TR2TK_STR-KUNNZ sy-vline 
WA_MC08TR2TK_STR-LIFNA sy-vline 
WA_MC08TR2TK_STR-LIFNZ sy-vline 
WA_MC08TR2TK_STR-LSTEL sy-vline 
WA_MC08TR2TK_STR-LSTEZ sy-vline 
WA_MC08TR2TK_STR-VSTEL sy-vline 
WA_MC08TR2TK_STR-VSTEZ sy-vline 
WA_MC08TR2TK_STR-WERKA sy-vline 
WA_MC08TR2TK_STR-WERKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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