ABAP Select data from SAP table MDRV 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 MDRV 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 MDRV. 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 MDRV 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_MDRV TYPE STANDARD TABLE OF MDRV,
      WA_MDRV TYPE MDRV,
      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: <MDRV> TYPE MDRV.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDRV
*  INTO TABLE @DATA(IT_MDRV2).
*--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_MDRV INDEX 1 INTO DATA(WA_MDRV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDRV>-MANDT = 1.
<MDRV>-EBELN = 1.
<MDRV>-EBELP = 1.
<MDRV>-RESWK = 1.
<MDRV>-BSTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDRV-LOEKZ, sy-vline,
  WA_MDRV-MATNR, sy-vline,
  WA_MDRV-EMATN, sy-vline,
  WA_MDRV-WERKS, sy-vline,
  WA_MDRV-LGORT, sy-vline,
  WA_MDRV-PLIFZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDRV 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_MDRV 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_MDRV INTO WA_MDRV.


*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_MDRV-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDRV-EBELN.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDRV-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDRV-LIFNR.
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_MDRV_STR, 
MANDT TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
RESWK TYPE STRING,
BSTYP TYPE STRING,
LOEKZ TYPE STRING,
MATNR TYPE STRING,
EMATN TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
PLIFZ TYPE STRING,
WEBAZ TYPE STRING,
PSTYP TYPE STRING,
KNTTP TYPE STRING,
KZVBR TYPE STRING,
SOBKZ TYPE STRING,
LIFNR TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDRV_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_MDRV_STR-MANDT sy-vline 
WA_MDRV_STR-EBELN sy-vline 
WA_MDRV_STR-EBELP sy-vline 
WA_MDRV_STR-RESWK sy-vline 
WA_MDRV_STR-BSTYP sy-vline 
WA_MDRV_STR-LOEKZ sy-vline 
WA_MDRV_STR-MATNR sy-vline 
WA_MDRV_STR-EMATN sy-vline 
WA_MDRV_STR-WERKS sy-vline 
WA_MDRV_STR-LGORT sy-vline 
WA_MDRV_STR-PLIFZ sy-vline 
WA_MDRV_STR-WEBAZ sy-vline 
WA_MDRV_STR-PSTYP sy-vline 
WA_MDRV_STR-KNTTP sy-vline 
WA_MDRV_STR-KZVBR sy-vline 
WA_MDRV_STR-SOBKZ sy-vline 
WA_MDRV_STR-LIFNR sy-vline 
WA_MDRV_STR-EKORG sy-vline 
WA_MDRV_STR-EKGRP sy-vline      INTO ld_text SEPARATED BY SPACE.

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