ABAP Select data from SAP table TMC2W into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TMC2W 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 TMC2W. 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 TMC2W 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_TMC2W TYPE STANDARD TABLE OF TMC2W,
      WA_TMC2W TYPE TMC2W,
      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: <TMC2W> TYPE TMC2W.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TMC2W.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TMC2W
  INTO TABLE IT_TMC2W.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TMC2W
*  INTO TABLE @DATA(IT_TMC2W2).
*--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_TMC2W INDEX 1 INTO DATA(WA_TMC2W2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TMC2W ASSIGNING <TMC2W>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TMC2W>-ZEITP = 1.
<TMC2W>-SQTAB = 1.
<TMC2W>-SQFNA = 1.
<TMC2W>-LFNR3 = 1.
<TMC2W>-FLG_EMPTY = 1.

ENDLOOP.

LOOP AT IT_TMC2W INTO WA_TMC2W.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TMC2W-ZEITPV, sy-vline,
  WA_TMC2W-SQTABV, sy-vline,
  WA_TMC2W-SQFNAV, sy-vline,
  WA_TMC2W-GRPNO, sy-vline,
  WA_TMC2W-MSGTY, sy-vline,
  WA_TMC2W-MSGID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TMC2W 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_TMC2W 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_TMC2W INTO WA_TMC2W.


*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_TMC2W_STR, 
ZEITP TYPE STRING,
SQTAB TYPE STRING,
SQFNA TYPE STRING,
LFNR3 TYPE STRING,
FLG_EMPTY TYPE STRING,
ZEITPV TYPE STRING,
SQTABV TYPE STRING,
SQFNAV TYPE STRING,
GRPNO TYPE STRING,
MSGTY TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
DOKCLASS TYPE STRING,
DOKNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TMC2W_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_TMC2W_STR-ZEITP sy-vline 
WA_TMC2W_STR-SQTAB sy-vline 
WA_TMC2W_STR-SQFNA sy-vline 
WA_TMC2W_STR-LFNR3 sy-vline 
WA_TMC2W_STR-FLG_EMPTY sy-vline 
WA_TMC2W_STR-ZEITPV sy-vline 
WA_TMC2W_STR-SQTABV sy-vline 
WA_TMC2W_STR-SQFNAV sy-vline 
WA_TMC2W_STR-GRPNO sy-vline 
WA_TMC2W_STR-MSGTY sy-vline 
WA_TMC2W_STR-MSGID sy-vline 
WA_TMC2W_STR-MSGNO sy-vline 
WA_TMC2W_STR-DOKCLASS sy-vline 
WA_TMC2W_STR-DOKNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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