ABAP Select data from SAP table MDTREESTRUC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDTREESTRUC
*  INTO TABLE @DATA(IT_MDTREESTRUC2).
*--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_MDTREESTRUC INDEX 1 INTO DATA(WA_MDTREESTRUC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDTREESTRUC>-MATNR = 1.
<MDTREESTRUC>-MATNR_INT = 1.
<MDTREESTRUC>-BERID = 1.
<MDTREESTRUC>-WERKS = 1.
<MDTREESTRUC>-MAKTX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDTREESTRUC-SOBKZ, sy-vline,
  WA_MDTREESTRUC-DISPO, sy-vline,
  WA_MDTREESTRUC-EKGRP, sy-vline,
  WA_MDTREESTRUC-LLPROBLEM, sy-vline,
  WA_MDTREESTRUC-ERR01, sy-vline,
  WA_MDTREESTRUC-MSGXX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDTREESTRUC 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_MDTREESTRUC 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_MDTREESTRUC INTO WA_MDTREESTRUC.


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

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

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field DELAY_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MDTREESTRUC-DELAY_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDTREESTRUC-DELAY_UNIT.
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_MDTREESTRUC_STR, 
MATNR TYPE STRING,
MATNR_INT TYPE STRING,
BERID TYPE STRING,
WERKS TYPE STRING,
MAKTX TYPE STRING,
SOBKZ TYPE STRING,
DISPO TYPE STRING,
EKGRP TYPE STRING,
LLPROBLEM TYPE STRING,
ERR01 TYPE STRING,
MSGXX TYPE STRING,
BDDAT TYPE STRING,
DELKZ TYPE STRING,
DELB0 TYPE STRING,
DELNR TYPE STRING,
DELPS TYPE STRING,
DELET TYPE STRING,
MNG01 TYPE STRING,
MEINS TYPE STRING,
RCDAT TYPE STRING,
RCEKZ TYPE STRING,
RCEB0 TYPE STRING,
RCENR TYPE STRING,
RCEPS TYPE STRING,
RCELT TYPE STRING,
UMDAT TYPE STRING,
MMEMO TYPE STRING,
ICON_DELAY TYPE STRING,
VRZGT TYPE STRING,
MEIVT TYPE STRING,
VRZGE TYPE STRING,
MEIVE TYPE STRING,
ICON_QUANT_DIFF TYPE STRING,
MNGDF TYPE STRING,
MEINH TYPE STRING,
GAMNG TYPE STRING,
GASMG TYPE STRING,
GMEIN TYPE STRING,
GLTRP TYPE STRING,
GSTRP TYPE STRING,
GSTRI TYPE STRING,
GLTRI TYPE STRING,
GETRI TYPE STRING,
GLTRS TYPE STRING,
GSTRS TYPE STRING,
AUART TYPE STRING,
STTXT TYPE STRING,
RMNGA TYPE STRING,
FRERO TYPE STRING,
GWEMG TYPE STRING,
WBEST TYPE STRING,
KBEST TYPE STRING,
PBEST TYPE STRING,
FEVOR TYPE STRING,
STPRS TYPE STRING,
PEINH TYPE STRING,
AUSSS TYPE STRING,
DZEIT TYPE STRING,
PLIFZ TYPE STRING,
WZEIT TYPE STRING,
EISBE TYPE STRING,
XFEHL TYPE STRING,
DELAY_ICON TYPE STRING,
DELAY_ME TYPE STRING,
DELAY_LEVEL TYPE STRING,
DELAY_SUM TYPE STRING,
DELAY_UNIT TYPE STRING,
SGT_SCAT TYPE STRING,
SGT_RCAT TYPE STRING,
NODE TYPE STRING,
PARENT_NODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDTREESTRUC_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_MDTREESTRUC_STR-MATNR sy-vline 
WA_MDTREESTRUC_STR-MATNR_INT sy-vline 
WA_MDTREESTRUC_STR-BERID sy-vline 
WA_MDTREESTRUC_STR-WERKS sy-vline 
WA_MDTREESTRUC_STR-MAKTX sy-vline 
WA_MDTREESTRUC_STR-SOBKZ sy-vline 
WA_MDTREESTRUC_STR-DISPO sy-vline 
WA_MDTREESTRUC_STR-EKGRP sy-vline 
WA_MDTREESTRUC_STR-LLPROBLEM sy-vline 
WA_MDTREESTRUC_STR-ERR01 sy-vline 
WA_MDTREESTRUC_STR-MSGXX sy-vline 
WA_MDTREESTRUC_STR-BDDAT sy-vline 
WA_MDTREESTRUC_STR-DELKZ sy-vline 
WA_MDTREESTRUC_STR-DELB0 sy-vline 
WA_MDTREESTRUC_STR-DELNR sy-vline 
WA_MDTREESTRUC_STR-DELPS sy-vline 
WA_MDTREESTRUC_STR-DELET sy-vline 
WA_MDTREESTRUC_STR-MNG01 sy-vline 
WA_MDTREESTRUC_STR-MEINS sy-vline 
WA_MDTREESTRUC_STR-RCDAT sy-vline 
WA_MDTREESTRUC_STR-RCEKZ sy-vline 
WA_MDTREESTRUC_STR-RCEB0 sy-vline 
WA_MDTREESTRUC_STR-RCENR sy-vline 
WA_MDTREESTRUC_STR-RCEPS sy-vline 
WA_MDTREESTRUC_STR-RCELT sy-vline 
WA_MDTREESTRUC_STR-UMDAT sy-vline 
WA_MDTREESTRUC_STR-MMEMO sy-vline 
WA_MDTREESTRUC_STR-ICON_DELAY sy-vline 
WA_MDTREESTRUC_STR-VRZGT sy-vline 
WA_MDTREESTRUC_STR-MEIVT sy-vline 
WA_MDTREESTRUC_STR-VRZGE sy-vline 
WA_MDTREESTRUC_STR-MEIVE sy-vline 
WA_MDTREESTRUC_STR-ICON_QUANT_DIFF sy-vline 
WA_MDTREESTRUC_STR-MNGDF sy-vline 
WA_MDTREESTRUC_STR-MEINH sy-vline 
WA_MDTREESTRUC_STR-GAMNG sy-vline 
WA_MDTREESTRUC_STR-GASMG sy-vline 
WA_MDTREESTRUC_STR-GMEIN sy-vline 
WA_MDTREESTRUC_STR-GLTRP sy-vline 
WA_MDTREESTRUC_STR-GSTRP sy-vline 
WA_MDTREESTRUC_STR-GSTRI sy-vline 
WA_MDTREESTRUC_STR-GLTRI sy-vline 
WA_MDTREESTRUC_STR-GETRI sy-vline 
WA_MDTREESTRUC_STR-GLTRS sy-vline 
WA_MDTREESTRUC_STR-GSTRS sy-vline 
WA_MDTREESTRUC_STR-AUART sy-vline 
WA_MDTREESTRUC_STR-STTXT sy-vline 
WA_MDTREESTRUC_STR-RMNGA sy-vline 
WA_MDTREESTRUC_STR-FRERO sy-vline 
WA_MDTREESTRUC_STR-GWEMG sy-vline 
WA_MDTREESTRUC_STR-WBEST sy-vline 
WA_MDTREESTRUC_STR-KBEST sy-vline 
WA_MDTREESTRUC_STR-PBEST sy-vline 
WA_MDTREESTRUC_STR-FEVOR sy-vline 
WA_MDTREESTRUC_STR-STPRS sy-vline 
WA_MDTREESTRUC_STR-PEINH sy-vline 
WA_MDTREESTRUC_STR-AUSSS sy-vline 
WA_MDTREESTRUC_STR-DZEIT sy-vline 
WA_MDTREESTRUC_STR-PLIFZ sy-vline 
WA_MDTREESTRUC_STR-WZEIT sy-vline 
WA_MDTREESTRUC_STR-EISBE sy-vline 
WA_MDTREESTRUC_STR-XFEHL sy-vline 
WA_MDTREESTRUC_STR-DELAY_ICON sy-vline 
WA_MDTREESTRUC_STR-DELAY_ME sy-vline 
WA_MDTREESTRUC_STR-DELAY_LEVEL sy-vline 
WA_MDTREESTRUC_STR-DELAY_SUM sy-vline 
WA_MDTREESTRUC_STR-DELAY_UNIT sy-vline 
WA_MDTREESTRUC_STR-SGT_SCAT sy-vline 
WA_MDTREESTRUC_STR-SGT_RCAT sy-vline 
WA_MDTREESTRUC_STR-NODE sy-vline 
WA_MDTREESTRUC_STR-PARENT_NODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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