ABAP Select data from SAP table MDKE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDKE
*  INTO TABLE @DATA(IT_MDKE2).
*--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_MDKE INDEX 1 INTO DATA(WA_MDKE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDKE>-DISST = 1.
<MDKE>-MATNR = 1.
<MDKE>-PLWRK = 1.
<MDKE>-PLSCN = 1.
<MDKE>-MAKTX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDKE-DISPO, sy-vline,
  WA_MDKE-BDBKZ, sy-vline,
  WA_MDKE-MTART, sy-vline,
  WA_MDKE-DISMM, sy-vline,
  WA_MDKE-MEINS, sy-vline,
  WA_MDKE-BESKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDKE 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_MDKE 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_MDKE INTO WA_MDKE.


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

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MDKE-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDKE-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_MDKE_STR, 
DISST TYPE STRING,
MATNR TYPE STRING,
PLWRK TYPE STRING,
PLSCN TYPE STRING,
MAKTX TYPE STRING,
DISPO TYPE STRING,
BDBKZ TYPE STRING,
MTART TYPE STRING,
DISMM TYPE STRING,
MEINS TYPE STRING,
BESKZ TYPE STRING,
SOBES TYPE STRING,
ESOBS TYPE STRING,
AUSNM TYPE STRING,
DTNUM TYPE STRING,
BERW1 TYPE STRING,
BERW2 TYPE STRING,
BERW4 TYPE STRING,
NAUKZ TYPE STRING,
AUSZ1 TYPE STRING,
AUSZ2 TYPE STRING,
AUSZ3 TYPE STRING,
AUSZ4 TYPE STRING,
AUSZ5 TYPE STRING,
AUSZ6 TYPE STRING,
AUSZ7 TYPE STRING,
AUSZ8 TYPE STRING,
DSDAT TYPE STRING,
KZPROMO TYPE STRING,
MAKZG TYPE STRING,
SUM01 TYPE STRING,
EISBE TYPE STRING,
MINBE TYPE STRING,
BERX1 TYPE STRING,
BERX2 TYPE STRING,
BERX3 TYPE STRING,
ALINE TYPE STRING,
ABLKZ TYPE STRING,
LAZKZ TYPE STRING,
KZSEASN TYPE STRING,
MAABC TYPE STRING,
DISGR TYPE STRING,
EVAPR TYPE STRING,
MODBAD TYPE STRING,
BERTX TYPE STRING,
BERID TYPE STRING,
FIXTR TYPE STRING,
MFHKZ TYPE STRING,
RTIME TYPE STRING,
READT TYPE STRING,
LOTST TYPE STRING,
EXPLT TYPE STRING,
SCHET TYPE STRING,
POSTT TYPE STRING,
MDTBT TYPE STRING,
RESBT TYPE STRING,
ARBPT TYPE STRING,
EINZT TYPE STRING,
RQITT TYPE STRING,
ICON_BDBKZ TYPE STRING,
ICON_AMPEL TYPE STRING,
AMPEL TYPE STRING,
COL_CHAR1_CONT TYPE STRING,
COL_CHAR2_CONT TYPE STRING,
COL_CHAR3_CONT TYPE STRING,
COL_DEC1_CONT TYPE STRING,
COL_DEC2_CONT TYPE STRING,
COL_DATS1_CONT TYPE STRING,
COL_DATS2_CONT TYPE STRING,
MMSTA TYPE STRING,
DSTMP TYPE STRING,
SGT_STATC TYPE STRING,
MPNSORT TYPE STRING,
PIC_DATFR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDKE_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_MDKE_STR-DISST sy-vline 
WA_MDKE_STR-MATNR sy-vline 
WA_MDKE_STR-PLWRK sy-vline 
WA_MDKE_STR-PLSCN sy-vline 
WA_MDKE_STR-MAKTX sy-vline 
WA_MDKE_STR-DISPO sy-vline 
WA_MDKE_STR-BDBKZ sy-vline 
WA_MDKE_STR-MTART sy-vline 
WA_MDKE_STR-DISMM sy-vline 
WA_MDKE_STR-MEINS sy-vline 
WA_MDKE_STR-BESKZ sy-vline 
WA_MDKE_STR-SOBES sy-vline 
WA_MDKE_STR-ESOBS sy-vline 
WA_MDKE_STR-AUSNM sy-vline 
WA_MDKE_STR-DTNUM sy-vline 
WA_MDKE_STR-BERW1 sy-vline 
WA_MDKE_STR-BERW2 sy-vline 
WA_MDKE_STR-BERW4 sy-vline 
WA_MDKE_STR-NAUKZ sy-vline 
WA_MDKE_STR-AUSZ1 sy-vline 
WA_MDKE_STR-AUSZ2 sy-vline 
WA_MDKE_STR-AUSZ3 sy-vline 
WA_MDKE_STR-AUSZ4 sy-vline 
WA_MDKE_STR-AUSZ5 sy-vline 
WA_MDKE_STR-AUSZ6 sy-vline 
WA_MDKE_STR-AUSZ7 sy-vline 
WA_MDKE_STR-AUSZ8 sy-vline 
WA_MDKE_STR-DSDAT sy-vline 
WA_MDKE_STR-KZPROMO sy-vline 
WA_MDKE_STR-MAKZG sy-vline 
WA_MDKE_STR-SUM01 sy-vline 
WA_MDKE_STR-EISBE sy-vline 
WA_MDKE_STR-MINBE sy-vline 
WA_MDKE_STR-BERX1 sy-vline 
WA_MDKE_STR-BERX2 sy-vline 
WA_MDKE_STR-BERX3 sy-vline 
WA_MDKE_STR-ALINE sy-vline 
WA_MDKE_STR-ABLKZ sy-vline 
WA_MDKE_STR-LAZKZ sy-vline 
WA_MDKE_STR-KZSEASN sy-vline 
WA_MDKE_STR-MAABC sy-vline 
WA_MDKE_STR-DISGR sy-vline 
WA_MDKE_STR-EVAPR sy-vline 
WA_MDKE_STR-MODBAD sy-vline 
WA_MDKE_STR-BERTX sy-vline 
WA_MDKE_STR-BERID sy-vline 
WA_MDKE_STR-FIXTR sy-vline 
WA_MDKE_STR-MFHKZ sy-vline 
WA_MDKE_STR-RTIME sy-vline 
WA_MDKE_STR-READT sy-vline 
WA_MDKE_STR-LOTST sy-vline 
WA_MDKE_STR-EXPLT sy-vline 
WA_MDKE_STR-SCHET sy-vline 
WA_MDKE_STR-POSTT sy-vline 
WA_MDKE_STR-MDTBT sy-vline 
WA_MDKE_STR-RESBT sy-vline 
WA_MDKE_STR-ARBPT sy-vline 
WA_MDKE_STR-EINZT sy-vline 
WA_MDKE_STR-RQITT sy-vline 
WA_MDKE_STR-ICON_BDBKZ sy-vline 
WA_MDKE_STR-ICON_AMPEL sy-vline 
WA_MDKE_STR-AMPEL sy-vline 
WA_MDKE_STR-COL_CHAR1_CONT sy-vline 
WA_MDKE_STR-COL_CHAR2_CONT sy-vline 
WA_MDKE_STR-COL_CHAR3_CONT sy-vline 
WA_MDKE_STR-COL_DEC1_CONT sy-vline 
WA_MDKE_STR-COL_DEC2_CONT sy-vline 
WA_MDKE_STR-COL_DATS1_CONT sy-vline 
WA_MDKE_STR-COL_DATS2_CONT sy-vline 
WA_MDKE_STR-MMSTA sy-vline 
WA_MDKE_STR-DSTMP sy-vline 
WA_MDKE_STR-SGT_STATC sy-vline 
WA_MDKE_STR-MPNSORT sy-vline 
WA_MDKE_STR-PIC_DATFR sy-vline      INTO ld_text SEPARATED BY SPACE.

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