ABAP Select data from SAP table MDEZ_USER_EXIT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDEZ_USER_EXIT
*  INTO TABLE @DATA(IT_MDEZ_USER_EXIT2).
*--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_MDEZ_USER_EXIT INDEX 1 INTO DATA(WA_MDEZ_USER_EXIT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDEZ_USER_EXIT>-PLAAB = 1.
<MDEZ_USER_EXIT>-PLANR = 1.
<MDEZ_USER_EXIT>-SORT0 = 1.
<MDEZ_USER_EXIT>-TAG00 = 1.
<MDEZ_USER_EXIT>-SORT1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDEZ_USER_EXIT-SORT2, sy-vline,
  WA_MDEZ_USER_EXIT-DELKZ, sy-vline,
  WA_MDEZ_USER_EXIT-PLUMI, sy-vline,
  WA_MDEZ_USER_EXIT-VRFKZ, sy-vline,
  WA_MDEZ_USER_EXIT-DAT00, sy-vline,
  WA_MDEZ_USER_EXIT-DAT01, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDEZ_USER_EXIT 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_MDEZ_USER_EXIT 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_MDEZ_USER_EXIT INTO WA_MDEZ_USER_EXIT.


*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 NUMCV, internal->external for field REVLV
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MDEZ_USER_EXIT-REVLV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDEZ_USER_EXIT-REVLV.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit MATN1, internal->external for field MDMAT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MDEZ_USER_EXIT-MDMAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDEZ_USER_EXIT-MDMAT.
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_MDEZ_USER_EXIT_STR, 
PLAAB TYPE STRING,
PLANR TYPE STRING,
SORT0 TYPE STRING,
TAG00 TYPE STRING,
SORT1 TYPE STRING,
SORT2 TYPE STRING,
DELKZ TYPE STRING,
PLUMI TYPE STRING,
VRFKZ TYPE STRING,
DAT00 TYPE STRING,
DAT01 TYPE STRING,
DELB0 TYPE STRING,
EXTRA TYPE STRING,
AUSSL TYPE STRING,
AUSKT TYPE STRING,
MNG01 TYPE STRING,
MNG02 TYPE STRING,
MNG03 TYPE STRING,
MNG04 TYPE STRING,
FBYTE TYPE STRING,
ALINE TYPE STRING,
ZLINE TYPE STRING,
SELKZ TYPE STRING,
ABEKZ TYPE STRING,
VERID TYPE STRING,
SERNR TYPE STRING,
REVLV TYPE STRING,
MNAUS TYPE STRING,
DAT02 TYPE STRING,
DAT03 TYPE STRING,
SOBES TYPE STRING,
ESOBS TYPE STRING,
WRK01 TYPE STRING,
WRK02 TYPE STRING,
LGORT TYPE STRING,
UMDAT TYPE STRING,
LIFNR TYPE STRING,
KUNNR TYPE STRING,
MD4KD TYPE STRING,
MD4LI TYPE STRING,
LLMSG TYPE STRING,
LLDLY TYPE STRING,
TRAMG TYPE STRING,
USEX1 TYPE STRING,
USEX2 TYPE STRING,
USEX3 TYPE STRING,
MDMAT TYPE STRING,
MDLOC TYPE STRING,
MDWRK TYPE STRING,
MDBER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDEZ_USER_EXIT_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_MDEZ_USER_EXIT_STR-PLAAB sy-vline 
WA_MDEZ_USER_EXIT_STR-PLANR sy-vline 
WA_MDEZ_USER_EXIT_STR-SORT0 sy-vline 
WA_MDEZ_USER_EXIT_STR-TAG00 sy-vline 
WA_MDEZ_USER_EXIT_STR-SORT1 sy-vline 
WA_MDEZ_USER_EXIT_STR-SORT2 sy-vline 
WA_MDEZ_USER_EXIT_STR-DELKZ sy-vline 
WA_MDEZ_USER_EXIT_STR-PLUMI sy-vline 
WA_MDEZ_USER_EXIT_STR-VRFKZ sy-vline 
WA_MDEZ_USER_EXIT_STR-DAT00 sy-vline 
WA_MDEZ_USER_EXIT_STR-DAT01 sy-vline 
WA_MDEZ_USER_EXIT_STR-DELB0 sy-vline 
WA_MDEZ_USER_EXIT_STR-EXTRA sy-vline 
WA_MDEZ_USER_EXIT_STR-AUSSL sy-vline 
WA_MDEZ_USER_EXIT_STR-AUSKT sy-vline 
WA_MDEZ_USER_EXIT_STR-MNG01 sy-vline 
WA_MDEZ_USER_EXIT_STR-MNG02 sy-vline 
WA_MDEZ_USER_EXIT_STR-MNG03 sy-vline 
WA_MDEZ_USER_EXIT_STR-MNG04 sy-vline 
WA_MDEZ_USER_EXIT_STR-FBYTE sy-vline 
WA_MDEZ_USER_EXIT_STR-ALINE sy-vline 
WA_MDEZ_USER_EXIT_STR-ZLINE sy-vline 
WA_MDEZ_USER_EXIT_STR-SELKZ sy-vline 
WA_MDEZ_USER_EXIT_STR-ABEKZ sy-vline 
WA_MDEZ_USER_EXIT_STR-VERID sy-vline 
WA_MDEZ_USER_EXIT_STR-SERNR sy-vline 
WA_MDEZ_USER_EXIT_STR-REVLV sy-vline 
WA_MDEZ_USER_EXIT_STR-MNAUS sy-vline 
WA_MDEZ_USER_EXIT_STR-DAT02 sy-vline 
WA_MDEZ_USER_EXIT_STR-DAT03 sy-vline 
WA_MDEZ_USER_EXIT_STR-SOBES sy-vline 
WA_MDEZ_USER_EXIT_STR-ESOBS sy-vline 
WA_MDEZ_USER_EXIT_STR-WRK01 sy-vline 
WA_MDEZ_USER_EXIT_STR-WRK02 sy-vline 
WA_MDEZ_USER_EXIT_STR-LGORT sy-vline 
WA_MDEZ_USER_EXIT_STR-UMDAT sy-vline 
WA_MDEZ_USER_EXIT_STR-LIFNR sy-vline 
WA_MDEZ_USER_EXIT_STR-KUNNR sy-vline 
WA_MDEZ_USER_EXIT_STR-MD4KD sy-vline 
WA_MDEZ_USER_EXIT_STR-MD4LI sy-vline 
WA_MDEZ_USER_EXIT_STR-LLMSG sy-vline 
WA_MDEZ_USER_EXIT_STR-LLDLY sy-vline 
WA_MDEZ_USER_EXIT_STR-TRAMG sy-vline 
WA_MDEZ_USER_EXIT_STR-USEX1 sy-vline 
WA_MDEZ_USER_EXIT_STR-USEX2 sy-vline 
WA_MDEZ_USER_EXIT_STR-USEX3 sy-vline 
WA_MDEZ_USER_EXIT_STR-MDMAT sy-vline 
WA_MDEZ_USER_EXIT_STR-MDLOC sy-vline 
WA_MDEZ_USER_EXIT_STR-MDWRK sy-vline 
WA_MDEZ_USER_EXIT_STR-MDBER sy-vline      INTO ld_text SEPARATED BY SPACE.

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