ABAP Select data from SAP table CKMLDUVN_DISPLAY_ALV_TREE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CKMLDUVN_DISPLAY_ALV_TREE
*  INTO TABLE @DATA(IT_CKMLDUVN_DISPLAY_ALV_TREE2).
*--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_CKMLDUVN_DISPLAY_ALV_TREE INDEX 1 INTO DATA(WA_CKMLDUVN_DISPLAY_ALV_TREE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CKMLDUVN_DISPLAY_ALV_TREE>-MATNR = 1.
<CKMLDUVN_DISPLAY_ALV_TREE>-WERKS = 1.
<CKMLDUVN_DISPLAY_ALV_TREE>-LGORT = 1.
<CKMLDUVN_DISPLAY_ALV_TREE>-CHARG = 1.
<CKMLDUVN_DISPLAY_ALV_TREE>-SDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CKMLDUVN_DISPLAY_ALV_TREE-EDAT, sy-vline,
  WA_CKMLDUVN_DISPLAY_ALV_TREE-MENGE, sy-vline,
  WA_CKMLDUVN_DISPLAY_ALV_TREE-MEINS, sy-vline,
  WA_CKMLDUVN_DISPLAY_ALV_TREE-NO_DIST, sy-vline,
  WA_CKMLDUVN_DISPLAY_ALV_TREE-BUDAT, sy-vline,
  WA_CKMLDUVN_DISPLAY_ALV_TREE-BUKRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CKMLDUVN_DISPLAY_ALV_TREE 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_CKMLDUVN_DISPLAY_ALV_TREE 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_CKMLDUVN_DISPLAY_ALV_TREE INTO WA_CKMLDUVN_DISPLAY_ALV_TREE.


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

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

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

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

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

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_CKMLDUVN_DISPLAY_ALV_TREE-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CKMLDUVN_DISPLAY_ALV_TREE-MJAHR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_CKMLDUVN_DISPLAY_ALV_TREE-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CKMLDUVN_DISPLAY_ALV_TREE-GJAHR.
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_CKMLDUVN_DISPLAY_ALV_TREE_STR, 
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
SDAT TYPE STRING,
EDAT TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
NO_DIST TYPE STRING,
BUDAT TYPE STRING,
BUKRS TYPE STRING,
APLID TYPE STRING,
PROTNR TYPE STRING,
DISTRIB TYPE STRING,
AUFNR TYPE STRING,
AUF_MATNR TYPE STRING,
STATUS TYPE STRING,
ITEMTYPE TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
IBLNR TYPE STRING,
GJAHR TYPE STRING,
ZEILI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CKMLDUVN_DISPLAY_ALV_TREE_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_CKMLDUVN_DISPLAY_ALV_TREE_STR-MATNR sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-WERKS sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-LGORT sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-CHARG sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-SDAT sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-EDAT sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-MENGE sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-MEINS sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-NO_DIST sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-BUDAT sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-BUKRS sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-APLID sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-PROTNR sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-DISTRIB sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-AUFNR sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-AUF_MATNR sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-STATUS sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-ITEMTYPE sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-MBLNR sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-MJAHR sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-IBLNR sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-GJAHR sy-vline 
WA_CKMLDUVN_DISPLAY_ALV_TREE_STR-ZEILI sy-vline      INTO ld_text SEPARATED BY SPACE.

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