ABAP Select data from SAP table MPES_RTGV_BOM_ITEM2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MPES_RTGV_BOM_ITEM2 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 MPES_RTGV_BOM_ITEM2. 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 MPES_RTGV_BOM_ITEM2 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_MPES_RTGV_BOM_ITEM2 TYPE STANDARD TABLE OF MPES_RTGV_BOM_ITEM2,
      WA_MPES_RTGV_BOM_ITEM2 TYPE MPES_RTGV_BOM_ITEM2,
      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: <MPES_RTGV_BOM_ITEM2> TYPE MPES_RTGV_BOM_ITEM2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MPES_RTGV_BOM_ITEM2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MPES_RTGV_BOM_ITEM2
  INTO TABLE IT_MPES_RTGV_BOM_ITEM2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MPES_RTGV_BOM_ITEM2
*  INTO TABLE @DATA(IT_MPES_RTGV_BOM_ITEM22).
*--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_MPES_RTGV_BOM_ITEM2 INDEX 1 INTO DATA(WA_MPES_RTGV_BOM_ITEM22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MPES_RTGV_BOM_ITEM2 ASSIGNING <MPES_RTGV_BOM_ITEM2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MPES_RTGV_BOM_ITEM2>-STLTY = 1.
<MPES_RTGV_BOM_ITEM2>-STLNR = 1.
<MPES_RTGV_BOM_ITEM2>-STLAL = 1.
<MPES_RTGV_BOM_ITEM2>-BOM_VERSN = 1.
<MPES_RTGV_BOM_ITEM2>-STVKN = 1.

ENDLOOP.

LOOP AT IT_MPES_RTGV_BOM_ITEM2 INTO WA_MPES_RTGV_BOM_ITEM2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MPES_RTGV_BOM_ITEM2-STVKN_VERSN, sy-vline,
  WA_MPES_RTGV_BOM_ITEM2-STLKN, sy-vline,
  WA_MPES_RTGV_BOM_ITEM2-POSNR, sy-vline,
  WA_MPES_RTGV_BOM_ITEM2-IDNRK, sy-vline,
  WA_MPES_RTGV_BOM_ITEM2-MAKTX, sy-vline,
  WA_MPES_RTGV_BOM_ITEM2-MENGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MPES_RTGV_BOM_ITEM2 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_MPES_RTGV_BOM_ITEM2 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_MPES_RTGV_BOM_ITEM2 INTO WA_MPES_RTGV_BOM_ITEM2.


*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 NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MPES_RTGV_BOM_ITEM2-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPES_RTGV_BOM_ITEM2-STLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STLAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MPES_RTGV_BOM_ITEM2-STLAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPES_RTGV_BOM_ITEM2-STLAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field POSNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MPES_RTGV_BOM_ITEM2-POSNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPES_RTGV_BOM_ITEM2-POSNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field IDNRK
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MPES_RTGV_BOM_ITEM2-IDNRK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPES_RTGV_BOM_ITEM2-IDNRK.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MPES_RTGV_BOM_ITEM2-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPES_RTGV_BOM_ITEM2-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MPES_RTGV_BOM_ITEM2-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPES_RTGV_BOM_ITEM2-AENNR.
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_MPES_RTGV_BOM_ITEM2_STR, 
STLTY TYPE STRING,
STLNR TYPE STRING,
STLAL TYPE STRING,
BOM_VERSN TYPE STRING,
STVKN TYPE STRING,
STVKN_VERSN TYPE STRING,
STLKN TYPE STRING,
POSNR TYPE STRING,
IDNRK TYPE STRING,
MAKTX TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
POSTP TYPE STRING,
PTEXT TYPE STRING,
AENNR TYPE STRING,
GUIDX TYPE STRING,
SORTF TYPE STRING,
POTX1 TYPE STRING,
POTX2 TYPE STRING,
KNOBJ TYPE STRING,
OBJTY TYPE STRING,
SCHGT TYPE STRING,
ITSOB TYPE STRING,
MRS_LEAF_ASGMT_UUID TYPE STRING,
MRS_LEAF_ASGMT_IS_AMBIGUOUS TYPE STRING,
MRS_DESIGNATOR TYPE STRING,
MRS_DESIGNATOR_NAME TYPE STRING,
MRS_DESIGNATOR_DESCR TYPE STRING,
DUMMY_STPO_INCL_EEW_PS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MPES_RTGV_BOM_ITEM2_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_MPES_RTGV_BOM_ITEM2_STR-STLTY sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-STLNR sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-STLAL sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-BOM_VERSN sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-STVKN sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-STVKN_VERSN sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-STLKN sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-POSNR sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-IDNRK sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-MAKTX sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-MENGE sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-MEINS sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-POSTP sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-PTEXT sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-AENNR sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-GUIDX sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-SORTF sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-POTX1 sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-POTX2 sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-KNOBJ sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-OBJTY sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-SCHGT sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-ITSOB sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-MRS_LEAF_ASGMT_UUID sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-MRS_LEAF_ASGMT_IS_AMBIGUOUS sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-MRS_DESIGNATOR sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-MRS_DESIGNATOR_NAME sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-MRS_DESIGNATOR_DESCR sy-vline 
WA_MPES_RTGV_BOM_ITEM2_STR-DUMMY_STPO_INCL_EEW_PS sy-vline      INTO ld_text SEPARATED BY SPACE.

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