ABAP Select data from SAP table MDCI into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MDCI 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 MDCI. 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 MDCI 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_MDCI TYPE STANDARD TABLE OF MDCI,
      WA_MDCI TYPE MDCI,
      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: <MDCI> TYPE MDCI.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDCI
*  INTO TABLE @DATA(IT_MDCI2).
*--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_MDCI INDEX 1 INTO DATA(WA_MDCI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDCI>-PLNFL = 1.
<MDCI>-VORNR = 1.
<MDCI>-LTXA1 = 1.
<MDCI>-ARBPL = 1.
<MDCI>-KTEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDCI-AUFPS, sy-vline,
  WA_MDCI-KDAUF, sy-vline,
  WA_MDCI-KDPOS, sy-vline,
  WA_MDCI-INSMK, sy-vline,
  WA_MDCI-ELIKZ, sy-vline,
  WA_MDCI-WEMPF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDCI 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_MDCI 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_MDCI INTO WA_MDCI.


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

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

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

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

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

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

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

*Conversion exit ABPSP, internal->external for field PS_PSP_PNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_MDCI-PS_PSP_PNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDCI-PS_PSP_PNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ALPHA, internal->external for field KONTO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDCI-KONTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDCI-KONTO.
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_MDCI_STR, 
PLNFL TYPE STRING,
VORNR TYPE STRING,
LTXA1 TYPE STRING,
ARBPL TYPE STRING,
KTEXT TYPE STRING,
AUFPS TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
INSMK TYPE STRING,
ELIKZ TYPE STRING,
WEMPF TYPE STRING,
ABLAD TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
LGPBE TYPE STRING,
ELGPBE TYPE STRING,
DISPO TYPE STRING,
FEVOR TYPE STRING,
AVAIL TYPE STRING,
LMINB TYPE STRING,
DISKZ TYPE STRING,
KANBN TYPE STRING,
NBDMG TYPE STRING,
MISSQ TYPE STRING,
ERFGME TYPE STRING,
WMPPI TYPE STRING,
ELORT TYPE STRING,
ESOBKZ TYPE STRING,
ELIFNR TYPE STRING,
EQUAN TYPE STRING,
RMISS TYPE STRING,
EXCEP TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
MSGTY TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
WEBLNR TYPE STRING,
WEBLPOS TYPE STRING,
AUFPL TYPE STRING,
AUTYP TYPE STRING,
KZBEW TYPE STRING,
LFPOS TYPE STRING,
NPLNR TYPE STRING,
PS_PSP_PNR TYPE STRING,
OBJNR TYPE STRING,
ERSDA TYPE STRING,
FWDAT TYPE STRING,
BUDAT TYPE STRING,
BLDAT TYPE STRING,
XSTOR TYPE STRING,
SJAHR TYPE STRING,
QPLOS TYPE STRING,
MHDAT TYPE STRING,
DNOTW TYPE STRING,
BERKZ TYPE STRING,
TBMNG TYPE STRING,
PRREG TYPE STRING,
KZECH TYPE STRING,
BWTAR TYPE STRING,
PLNUM TYPE STRING,
KONTO TYPE STRING,
KTOMA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDCI_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_MDCI_STR-PLNFL sy-vline 
WA_MDCI_STR-VORNR sy-vline 
WA_MDCI_STR-LTXA1 sy-vline 
WA_MDCI_STR-ARBPL sy-vline 
WA_MDCI_STR-KTEXT sy-vline 
WA_MDCI_STR-AUFPS sy-vline 
WA_MDCI_STR-KDAUF sy-vline 
WA_MDCI_STR-KDPOS sy-vline 
WA_MDCI_STR-INSMK sy-vline 
WA_MDCI_STR-ELIKZ sy-vline 
WA_MDCI_STR-WEMPF sy-vline 
WA_MDCI_STR-ABLAD sy-vline 
WA_MDCI_STR-LGNUM sy-vline 
WA_MDCI_STR-LGTYP sy-vline 
WA_MDCI_STR-LGPBE sy-vline 
WA_MDCI_STR-ELGPBE sy-vline 
WA_MDCI_STR-DISPO sy-vline 
WA_MDCI_STR-FEVOR sy-vline 
WA_MDCI_STR-AVAIL sy-vline 
WA_MDCI_STR-LMINB sy-vline 
WA_MDCI_STR-DISKZ sy-vline 
WA_MDCI_STR-KANBN sy-vline 
WA_MDCI_STR-NBDMG sy-vline 
WA_MDCI_STR-MISSQ sy-vline 
WA_MDCI_STR-ERFGME sy-vline 
WA_MDCI_STR-WMPPI sy-vline 
WA_MDCI_STR-ELORT sy-vline 
WA_MDCI_STR-ESOBKZ sy-vline 
WA_MDCI_STR-ELIFNR sy-vline 
WA_MDCI_STR-EQUAN sy-vline 
WA_MDCI_STR-RMISS sy-vline 
WA_MDCI_STR-EXCEP sy-vline 
WA_MDCI_STR-MSGID sy-vline 
WA_MDCI_STR-MSGNO sy-vline 
WA_MDCI_STR-MSGTY sy-vline 
WA_MDCI_STR-MSGV1 sy-vline 
WA_MDCI_STR-MSGV2 sy-vline 
WA_MDCI_STR-MSGV3 sy-vline 
WA_MDCI_STR-MSGV4 sy-vline 
WA_MDCI_STR-WEBLNR sy-vline 
WA_MDCI_STR-WEBLPOS sy-vline 
WA_MDCI_STR-AUFPL sy-vline 
WA_MDCI_STR-AUTYP sy-vline 
WA_MDCI_STR-KZBEW sy-vline 
WA_MDCI_STR-LFPOS sy-vline 
WA_MDCI_STR-NPLNR sy-vline 
WA_MDCI_STR-PS_PSP_PNR sy-vline 
WA_MDCI_STR-OBJNR sy-vline 
WA_MDCI_STR-ERSDA sy-vline 
WA_MDCI_STR-FWDAT sy-vline 
WA_MDCI_STR-BUDAT sy-vline 
WA_MDCI_STR-BLDAT sy-vline 
WA_MDCI_STR-XSTOR sy-vline 
WA_MDCI_STR-SJAHR sy-vline 
WA_MDCI_STR-QPLOS sy-vline 
WA_MDCI_STR-MHDAT sy-vline 
WA_MDCI_STR-DNOTW sy-vline 
WA_MDCI_STR-BERKZ sy-vline 
WA_MDCI_STR-TBMNG sy-vline 
WA_MDCI_STR-PRREG sy-vline 
WA_MDCI_STR-KZECH sy-vline 
WA_MDCI_STR-BWTAR sy-vline 
WA_MDCI_STR-PLNUM sy-vline 
WA_MDCI_STR-KONTO sy-vline 
WA_MDCI_STR-KTOMA sy-vline      INTO ld_text SEPARATED BY SPACE.

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