ABAP Select data from SAP table MCEKKN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCEKKN
*  INTO TABLE @DATA(IT_MCEKKN2).
*--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_MCEKKN INDEX 1 INTO DATA(WA_MCEKKN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCEKKN>-MANDT = 1.
<MCEKKN>-EBELN = 1.
<MCEKKN>-EBELP = 1.
<MCEKKN>-ZEKKN = 1.
<MCEKKN>-LOEKZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCEKKN-AEDAT, sy-vline,
  WA_MCEKKN-KFLAG, sy-vline,
  WA_MCEKKN-MENGE, sy-vline,
  WA_MCEKKN-VPROZ, sy-vline,
  WA_MCEKKN-NETWR, sy-vline,
  WA_MCEKKN-SAKTO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCEKKN 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_MCEKKN 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_MCEKKN INTO WA_MCEKKN.


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

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

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

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

*Conversion exit ALPHA, internal->external for field ANLN1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCEKKN-ANLN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKKN-ANLN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANLN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCEKKN-ANLN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKKN-ANLN2.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit IMKEY, internal->external for field IMKEY
CALL FUNCTION 'CONVERSION_EXIT_IMKEY_OUTPUT'
  EXPORTING
    input =                      WA_MCEKKN-IMKEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKKN-IMKEY.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit FMCIS, internal->external for field FIPOS
CALL FUNCTION 'CONVERSION_EXIT_FMCIS_OUTPUT'
  EXPORTING
    input =                      WA_MCEKKN-FIPOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKKN-FIPOS.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ALPHA, internal->external for field GRANT_NBR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCEKKN-GRANT_NBR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKKN-GRANT_NBR.
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_MCEKKN_STR, 
MANDT TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
ZEKKN TYPE STRING,
LOEKZ TYPE STRING,
AEDAT TYPE STRING,
KFLAG TYPE STRING,
MENGE TYPE STRING,
VPROZ TYPE STRING,
NETWR TYPE STRING,
SAKTO TYPE STRING,
GSBER TYPE STRING,
KOSTL TYPE STRING,
PROJN TYPE STRING,
VBELN TYPE STRING,
VBELP TYPE STRING,
VETEN TYPE STRING,
KZBRB TYPE STRING,
ANLN1 TYPE STRING,
ANLN2 TYPE STRING,
AUFNR TYPE STRING,
WEMPF TYPE STRING,
ABLAD TYPE STRING,
KOKRS TYPE STRING,
XBKST TYPE STRING,
XBAUF TYPE STRING,
XBPRO TYPE STRING,
EREKZ TYPE STRING,
KSTRG TYPE STRING,
PAOBJNR TYPE STRING,
PRCTR TYPE STRING,
PS_PSP_PNR TYPE STRING,
NPLNR TYPE STRING,
AUFPL TYPE STRING,
IMKEY TYPE STRING,
APLZL TYPE STRING,
VPTNR TYPE STRING,
FIPOS TYPE STRING,
RECID TYPE STRING,
DUMMY_INCL_EEW_COBL TYPE STRING,
FISTL TYPE STRING,
GEBER TYPE STRING,
FKBER TYPE STRING,
DABRZ TYPE STRING,
AUFPL_ORD TYPE STRING,
APLZL_ORD TYPE STRING,
MWSKZ TYPE STRING,
TXJCD TYPE STRING,
NAVNW TYPE STRING,
KBLNR TYPE STRING,
KBLPOS TYPE STRING,
LSTAR TYPE STRING,
PRZNR TYPE STRING,
GRANT_NBR TYPE STRING,
NETHW TYPE STRING,
EFFWR TYPE STRING,
EFFHW TYPE STRING,
FIKRS TYPE STRING,
KTOPL TYPE STRING,
BUDGET_PD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCEKKN_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_MCEKKN_STR-MANDT sy-vline 
WA_MCEKKN_STR-EBELN sy-vline 
WA_MCEKKN_STR-EBELP sy-vline 
WA_MCEKKN_STR-ZEKKN sy-vline 
WA_MCEKKN_STR-LOEKZ sy-vline 
WA_MCEKKN_STR-AEDAT sy-vline 
WA_MCEKKN_STR-KFLAG sy-vline 
WA_MCEKKN_STR-MENGE sy-vline 
WA_MCEKKN_STR-VPROZ sy-vline 
WA_MCEKKN_STR-NETWR sy-vline 
WA_MCEKKN_STR-SAKTO sy-vline 
WA_MCEKKN_STR-GSBER sy-vline 
WA_MCEKKN_STR-KOSTL sy-vline 
WA_MCEKKN_STR-PROJN sy-vline 
WA_MCEKKN_STR-VBELN sy-vline 
WA_MCEKKN_STR-VBELP sy-vline 
WA_MCEKKN_STR-VETEN sy-vline 
WA_MCEKKN_STR-KZBRB sy-vline 
WA_MCEKKN_STR-ANLN1 sy-vline 
WA_MCEKKN_STR-ANLN2 sy-vline 
WA_MCEKKN_STR-AUFNR sy-vline 
WA_MCEKKN_STR-WEMPF sy-vline 
WA_MCEKKN_STR-ABLAD sy-vline 
WA_MCEKKN_STR-KOKRS sy-vline 
WA_MCEKKN_STR-XBKST sy-vline 
WA_MCEKKN_STR-XBAUF sy-vline 
WA_MCEKKN_STR-XBPRO sy-vline 
WA_MCEKKN_STR-EREKZ sy-vline 
WA_MCEKKN_STR-KSTRG sy-vline 
WA_MCEKKN_STR-PAOBJNR sy-vline 
WA_MCEKKN_STR-PRCTR sy-vline 
WA_MCEKKN_STR-PS_PSP_PNR sy-vline 
WA_MCEKKN_STR-NPLNR sy-vline 
WA_MCEKKN_STR-AUFPL sy-vline 
WA_MCEKKN_STR-IMKEY sy-vline 
WA_MCEKKN_STR-APLZL sy-vline 
WA_MCEKKN_STR-VPTNR sy-vline 
WA_MCEKKN_STR-FIPOS sy-vline 
WA_MCEKKN_STR-RECID sy-vline 
WA_MCEKKN_STR-DUMMY_INCL_EEW_COBL sy-vline 
WA_MCEKKN_STR-FISTL sy-vline 
WA_MCEKKN_STR-GEBER sy-vline 
WA_MCEKKN_STR-FKBER sy-vline 
WA_MCEKKN_STR-DABRZ sy-vline 
WA_MCEKKN_STR-AUFPL_ORD sy-vline 
WA_MCEKKN_STR-APLZL_ORD sy-vline 
WA_MCEKKN_STR-MWSKZ sy-vline 
WA_MCEKKN_STR-TXJCD sy-vline 
WA_MCEKKN_STR-NAVNW sy-vline 
WA_MCEKKN_STR-KBLNR sy-vline 
WA_MCEKKN_STR-KBLPOS sy-vline 
WA_MCEKKN_STR-LSTAR sy-vline 
WA_MCEKKN_STR-PRZNR sy-vline 
WA_MCEKKN_STR-GRANT_NBR sy-vline 
WA_MCEKKN_STR-NETHW sy-vline 
WA_MCEKKN_STR-EFFWR sy-vline 
WA_MCEKKN_STR-EFFHW sy-vline 
WA_MCEKKN_STR-FIKRS sy-vline 
WA_MCEKKN_STR-KTOPL sy-vline 
WA_MCEKKN_STR-BUDGET_PD sy-vline      INTO ld_text SEPARATED BY SPACE.

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