ABAP Select data from SAP table TMCNV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TMCNV
*  INTO TABLE @DATA(IT_TMCNV2).
*--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_TMCNV INDEX 1 INTO DATA(WA_TMCNV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TMCNV>-MANDT = 1.
<TMCNV>-CONVID = 1.
<TMCNV>-LMATNR = 1.
<TMCNV>-LMASKE = 1.
<TMCNV>-ATRENN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TMCNV-ATRENNX, sy-vline,
  WA_TMCNV-LNGEFF, sy-vline,
  WA_TMCNV-MASKE, sy-vline,
  WA_TMCNV-TZ, sy-vline,
  WA_TMCNV-FLAG0, sy-vline,
  WA_TMCNV-LEXFLAG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TMCNV 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_TMCNV 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_TMCNV INTO WA_TMCNV.


*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_TMCNV_STR, 
MANDT TYPE STRING,
CONVID TYPE STRING,
LMATNR TYPE STRING,
LMASKE TYPE STRING,
ATRENN TYPE STRING,
ATRENNX TYPE STRING,
LNGEFF TYPE STRING,
MASKE TYPE STRING,
TZ TYPE STRING,
FLAG0 TYPE STRING,
LEXFLAG TYPE STRING,
VCHAR TYPE STRING,
LMATNR_TOTAL TYPE STRING,
LMATNR_VERS TYPE STRING,
MAX_DIFF TYPE STRING,
MVAKT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TMCNV_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_TMCNV_STR-MANDT sy-vline 
WA_TMCNV_STR-CONVID sy-vline 
WA_TMCNV_STR-LMATNR sy-vline 
WA_TMCNV_STR-LMASKE sy-vline 
WA_TMCNV_STR-ATRENN sy-vline 
WA_TMCNV_STR-ATRENNX sy-vline 
WA_TMCNV_STR-LNGEFF sy-vline 
WA_TMCNV_STR-MASKE sy-vline 
WA_TMCNV_STR-TZ sy-vline 
WA_TMCNV_STR-FLAG0 sy-vline 
WA_TMCNV_STR-LEXFLAG sy-vline 
WA_TMCNV_STR-VCHAR sy-vline 
WA_TMCNV_STR-LMATNR_TOTAL sy-vline 
WA_TMCNV_STR-LMATNR_VERS sy-vline 
WA_TMCNV_STR-MAX_DIFF sy-vline 
WA_TMCNV_STR-MVAKT sy-vline      INTO ld_text SEPARATED BY SPACE.

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