ABAP Select data from SAP table MDVW 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 MDVW 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 MDVW. 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 MDVW 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_MDVW TYPE STANDARD TABLE OF MDVW,
      WA_MDVW TYPE MDVW,
      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: <MDVW> TYPE MDVW.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDVW
*  INTO TABLE @DATA(IT_MDVW2).
*--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_MDVW INDEX 1 INTO DATA(WA_MDVW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDVW>-MATNR = 1.
<MDVW>-WERKS = 1.
<MDVW>-LAGME = 1.
<MDVW>-ERFME = 1.
<MDVW>-BDMNG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDVW-ERFMG, sy-vline,
  WA_MDVW-WAMNG, sy-vline,
  WA_MDVW-WAWRT, sy-vline,
  WA_MDVW-SHKZG, sy-vline,
  WA_MDVW-SOBKZ, sy-vline,
  WA_MDVW-LGPRO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDVW 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_MDVW 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_MDVW INTO WA_MDVW.


*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_MDVW-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDVW-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDVW-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDVW-KUNNR.
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_MDVW_STR, 
MATNR TYPE STRING,
WERKS TYPE STRING,
LAGME TYPE STRING,
ERFME TYPE STRING,
BDMNG TYPE STRING,
ERFMG TYPE STRING,
WAMNG TYPE STRING,
WAWRT TYPE STRING,
SHKZG TYPE STRING,
SOBKZ TYPE STRING,
LGPRO TYPE STRING,
CHARG TYPE STRING,
BWTAR TYPE STRING,
BYPRO TYPE STRING,
SGT_RCAT TYPE STRING,
SGT_SCAT TYPE STRING,
/CWM/ERFMG TYPE STRING,
/CWM/ERFME TYPE STRING,
DISUB_OWNER TYPE STRING,
MAT_PSPNR TYPE STRING,
MAT_KDAUF TYPE STRING,
MAT_KDPOS TYPE STRING,
KUNNR TYPE STRING,
BEIKZ TYPE STRING,
SERRU TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDVW_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_MDVW_STR-MATNR sy-vline 
WA_MDVW_STR-WERKS sy-vline 
WA_MDVW_STR-LAGME sy-vline 
WA_MDVW_STR-ERFME sy-vline 
WA_MDVW_STR-BDMNG sy-vline 
WA_MDVW_STR-ERFMG sy-vline 
WA_MDVW_STR-WAMNG sy-vline 
WA_MDVW_STR-WAWRT sy-vline 
WA_MDVW_STR-SHKZG sy-vline 
WA_MDVW_STR-SOBKZ sy-vline 
WA_MDVW_STR-LGPRO sy-vline 
WA_MDVW_STR-CHARG sy-vline 
WA_MDVW_STR-BWTAR sy-vline 
WA_MDVW_STR-BYPRO sy-vline 
WA_MDVW_STR-SGT_RCAT sy-vline 
WA_MDVW_STR-SGT_SCAT sy-vline 
WA_MDVW_STR-/CWM/ERFMG sy-vline 
WA_MDVW_STR-/CWM/ERFME sy-vline 
WA_MDVW_STR-DISUB_OWNER sy-vline 
WA_MDVW_STR-MAT_PSPNR sy-vline 
WA_MDVW_STR-MAT_KDAUF sy-vline 
WA_MDVW_STR-MAT_KDPOS sy-vline 
WA_MDVW_STR-KUNNR sy-vline 
WA_MDVW_STR-BEIKZ sy-vline 
WA_MDVW_STR-SERRU sy-vline      INTO ld_text SEPARATED BY SPACE.

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