ABAP Select data from SAP table TN32M into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TN32M 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 TN32M. 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 TN32M 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_TN32M TYPE STANDARD TABLE OF TN32M,
      WA_TN32M TYPE TN32M,
      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: <TN32M> TYPE TN32M.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TN32M.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TN32M
  INTO TABLE IT_TN32M.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TN32M
*  INTO TABLE @DATA(IT_TN32M2).
*--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_TN32M INDEX 1 INTO DATA(WA_TN32M2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TN32M ASSIGNING <TN32M>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TN32M>-MANDT = 1.
<TN32M>-EINRI = 1.
<TN32M>-MERKI = 1.
<TN32M>-MERKS = 1.
<TN32M>-MKMFU = 1.

ENDLOOP.

LOOP AT IT_TN32M INTO WA_TN32M.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TN32M-AKTIV, sy-vline,
  WA_TN32M-MERKP, sy-vline,
  WA_TN32M-AUFKN, sy-vline,
  WA_TN32M-AMB, sy-vline,
  WA_TN32M-STAT, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_TN32M 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_TN32M 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_TN32M INTO WA_TN32M.


*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_TN32M-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN32M-EINRI.
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_TN32M_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
MERKI TYPE STRING,
MERKS TYPE STRING,
MKMFU TYPE STRING,
AKTIV TYPE STRING,
MERKP TYPE STRING,
AUFKN TYPE STRING,
AMB TYPE STRING,
STAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TN32M_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_TN32M_STR-MANDT sy-vline 
WA_TN32M_STR-EINRI sy-vline 
WA_TN32M_STR-MERKI sy-vline 
WA_TN32M_STR-MERKS sy-vline 
WA_TN32M_STR-MKMFU sy-vline 
WA_TN32M_STR-AKTIV sy-vline 
WA_TN32M_STR-MERKP sy-vline 
WA_TN32M_STR-AUFKN sy-vline 
WA_TN32M_STR-AMB sy-vline 
WA_TN32M_STR-STAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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