ABAP Select data from SAP table ROIJ_MKPF_MSEG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ROIJ_MKPF_MSEG
*  INTO TABLE @DATA(IT_ROIJ_MKPF_MSEG2).
*--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_ROIJ_MKPF_MSEG INDEX 1 INTO DATA(WA_ROIJ_MKPF_MSEG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ROIJ_MKPF_MSEG>-MBLNR = 1.
<ROIJ_MKPF_MSEG>-MJAHR = 1.
<ROIJ_MKPF_MSEG>-BUDAT = 1.
<ROIJ_MKPF_MSEG>-CPUDT = 1.
<ROIJ_MKPF_MSEG>-CPUTM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ROIJ_MKPF_MSEG-BLART, sy-vline,
  WA_ROIJ_MKPF_MSEG-ZEILE, sy-vline,
  WA_ROIJ_MKPF_MSEG-MATNR, sy-vline,
  WA_ROIJ_MKPF_MSEG-CHARG, sy-vline,
  WA_ROIJ_MKPF_MSEG-BWTAR, sy-vline,
  WA_ROIJ_MKPF_MSEG-WERKS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ROIJ_MKPF_MSEG 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_ROIJ_MKPF_MSEG 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_ROIJ_MKPF_MSEG INTO WA_ROIJ_MKPF_MSEG.


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

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_ROIJ_MKPF_MSEG-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ROIJ_MKPF_MSEG-MJAHR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ROIJ_MKPF_MSEG-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ROIJ_MKPF_MSEG-MEINS.
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_ROIJ_MKPF_MSEG_STR, 
MBLNR TYPE STRING,
MJAHR TYPE STRING,
BUDAT TYPE STRING,
CPUDT TYPE STRING,
CPUTM TYPE STRING,
BLART TYPE STRING,
ZEILE TYPE STRING,
MATNR TYPE STRING,
CHARG TYPE STRING,
BWTAR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
SOBKZ TYPE STRING,
BWART TYPE STRING,
SHKZG TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
KZBEW TYPE STRING,
KZVBR TYPE STRING,
DMBTR TYPE STRING,
WAERS TYPE STRING,
DMBUM TYPE STRING,
MENGU TYPE STRING,
WERTU TYPE STRING,
BUSTM TYPE STRING,
LBBSA TYPE STRING,
BWAGR TYPE STRING,
ADQNTP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ROIJ_MKPF_MSEG_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_ROIJ_MKPF_MSEG_STR-MBLNR sy-vline 
WA_ROIJ_MKPF_MSEG_STR-MJAHR sy-vline 
WA_ROIJ_MKPF_MSEG_STR-BUDAT sy-vline 
WA_ROIJ_MKPF_MSEG_STR-CPUDT sy-vline 
WA_ROIJ_MKPF_MSEG_STR-CPUTM sy-vline 
WA_ROIJ_MKPF_MSEG_STR-BLART sy-vline 
WA_ROIJ_MKPF_MSEG_STR-ZEILE sy-vline 
WA_ROIJ_MKPF_MSEG_STR-MATNR sy-vline 
WA_ROIJ_MKPF_MSEG_STR-CHARG sy-vline 
WA_ROIJ_MKPF_MSEG_STR-BWTAR sy-vline 
WA_ROIJ_MKPF_MSEG_STR-WERKS sy-vline 
WA_ROIJ_MKPF_MSEG_STR-LGORT sy-vline 
WA_ROIJ_MKPF_MSEG_STR-SOBKZ sy-vline 
WA_ROIJ_MKPF_MSEG_STR-BWART sy-vline 
WA_ROIJ_MKPF_MSEG_STR-SHKZG sy-vline 
WA_ROIJ_MKPF_MSEG_STR-MENGE sy-vline 
WA_ROIJ_MKPF_MSEG_STR-MEINS sy-vline 
WA_ROIJ_MKPF_MSEG_STR-KZBEW sy-vline 
WA_ROIJ_MKPF_MSEG_STR-KZVBR sy-vline 
WA_ROIJ_MKPF_MSEG_STR-DMBTR sy-vline 
WA_ROIJ_MKPF_MSEG_STR-WAERS sy-vline 
WA_ROIJ_MKPF_MSEG_STR-DMBUM sy-vline 
WA_ROIJ_MKPF_MSEG_STR-MENGU sy-vline 
WA_ROIJ_MKPF_MSEG_STR-WERTU sy-vline 
WA_ROIJ_MKPF_MSEG_STR-BUSTM sy-vline 
WA_ROIJ_MKPF_MSEG_STR-LBBSA sy-vline 
WA_ROIJ_MKPF_MSEG_STR-BWAGR sy-vline 
WA_ROIJ_MKPF_MSEG_STR-ADQNTP sy-vline      INTO ld_text SEPARATED BY SPACE.

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