ABAP Select data from SAP table MDQM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDQM
*  INTO TABLE @DATA(IT_MDQM2).
*--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_MDQM INDEX 1 INTO DATA(WA_MDQM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDQM>-MANDANT = 1.
<MDQM>-PRUEFLOS = 1.
<MDQM>-MATNR = 1.
<MDQM>-WERKVORG = 1.
<MDQM>-INSMK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDQM-PASTRTERM, sy-vline,
  WA_MDQM-PAENDTERM, sy-vline,
  WA_MDQM-CHARG, sy-vline,
  WA_MDQM-LAGORTVORG, sy-vline,
  WA_MDQM-LOSMENGE, sy-vline,
  WA_MDQM-LMENGEZUB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDQM 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_MDQM 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_MDQM INTO WA_MDQM.


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

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

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

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

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

*Conversion exit NUMCV, internal->external for field REVLV
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MDQM-REVLV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDQM-REVLV.
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_MDQM_STR, 
MANDANT TYPE STRING,
PRUEFLOS TYPE STRING,
MATNR TYPE STRING,
WERKVORG TYPE STRING,
INSMK TYPE STRING,
PASTRTERM TYPE STRING,
PAENDTERM TYPE STRING,
CHARG TYPE STRING,
LAGORTVORG TYPE STRING,
LOSMENGE TYPE STRING,
LMENGEZUB TYPE STRING,
MENGENEINH TYPE STRING,
SOBKZ TYPE STRING,
KNTTP TYPE STRING,
KZVBR TYPE STRING,
PSTYP TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
PS_PSP_PNR TYPE STRING,
STAT34 TYPE STRING,
STAT35 TYPE STRING,
HERKUNFT TYPE STRING,
REVLV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDQM_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_MDQM_STR-MANDANT sy-vline 
WA_MDQM_STR-PRUEFLOS sy-vline 
WA_MDQM_STR-MATNR sy-vline 
WA_MDQM_STR-WERKVORG sy-vline 
WA_MDQM_STR-INSMK sy-vline 
WA_MDQM_STR-PASTRTERM sy-vline 
WA_MDQM_STR-PAENDTERM sy-vline 
WA_MDQM_STR-CHARG sy-vline 
WA_MDQM_STR-LAGORTVORG sy-vline 
WA_MDQM_STR-LOSMENGE sy-vline 
WA_MDQM_STR-LMENGEZUB sy-vline 
WA_MDQM_STR-MENGENEINH sy-vline 
WA_MDQM_STR-SOBKZ sy-vline 
WA_MDQM_STR-KNTTP sy-vline 
WA_MDQM_STR-KZVBR sy-vline 
WA_MDQM_STR-PSTYP sy-vline 
WA_MDQM_STR-KDAUF sy-vline 
WA_MDQM_STR-KDPOS sy-vline 
WA_MDQM_STR-PS_PSP_PNR sy-vline 
WA_MDQM_STR-STAT34 sy-vline 
WA_MDQM_STR-STAT35 sy-vline 
WA_MDQM_STR-HERKUNFT sy-vline 
WA_MDQM_STR-REVLV sy-vline      INTO ld_text SEPARATED BY SPACE.

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