ABAP Select data from SAP table MPL_TREE_STRUCTURE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MPL_TREE_STRUCTURE
*  INTO TABLE @DATA(IT_MPL_TREE_STRUCTURE2).
*--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_MPL_TREE_STRUCTURE INDEX 1 INTO DATA(WA_MPL_TREE_STRUCTURE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MPL_TREE_STRUCTURE>-PARENTGUID = 1.
<MPL_TREE_STRUCTURE>-CHILDGUID = 1.
<MPL_TREE_STRUCTURE>-CHILDOTYPE = 1.
<MPL_TREE_STRUCTURE>-CHILDAPPLTYPE = 1.
<MPL_TREE_STRUCTURE>-PNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MPL_TREE_STRUCTURE-PNTEXT, sy-vline,
  WA_MPL_TREE_STRUCTURE-PARENTOTYPE, sy-vline,
  WA_MPL_TREE_STRUCTURE-PARENTPNAME, sy-vline,
  WA_MPL_TREE_STRUCTURE-PARENTPNTEXT, sy-vline,
  WA_MPL_TREE_STRUCTURE-MPLLEVEL, sy-vline,
  WA_MPL_TREE_STRUCTURE-CHILDINDEX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MPL_TREE_STRUCTURE 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_MPL_TREE_STRUCTURE 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_MPL_TREE_STRUCTURE INTO WA_MPL_TREE_STRUCTURE.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MPL_TREE_STRUCTURE_STR, 
PARENTGUID TYPE STRING,
CHILDGUID TYPE STRING,
CHILDOTYPE TYPE STRING,
CHILDAPPLTYPE TYPE STRING,
PNAME TYPE STRING,
PNTEXT TYPE STRING,
PARENTOTYPE TYPE STRING,
PARENTPNAME TYPE STRING,
PARENTPNTEXT TYPE STRING,
MPLLEVEL TYPE STRING,
CHILDINDEX TYPE STRING,
PARENTINDEX TYPE STRING,
CUOBJ TYPE STRING,
TECHS TYPE STRING,
SUPFID TYPE STRING,
PATH TYPE STRING,
PATH_HASHED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MPL_TREE_STRUCTURE_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_MPL_TREE_STRUCTURE_STR-PARENTGUID sy-vline 
WA_MPL_TREE_STRUCTURE_STR-CHILDGUID sy-vline 
WA_MPL_TREE_STRUCTURE_STR-CHILDOTYPE sy-vline 
WA_MPL_TREE_STRUCTURE_STR-CHILDAPPLTYPE sy-vline 
WA_MPL_TREE_STRUCTURE_STR-PNAME sy-vline 
WA_MPL_TREE_STRUCTURE_STR-PNTEXT sy-vline 
WA_MPL_TREE_STRUCTURE_STR-PARENTOTYPE sy-vline 
WA_MPL_TREE_STRUCTURE_STR-PARENTPNAME sy-vline 
WA_MPL_TREE_STRUCTURE_STR-PARENTPNTEXT sy-vline 
WA_MPL_TREE_STRUCTURE_STR-MPLLEVEL sy-vline 
WA_MPL_TREE_STRUCTURE_STR-CHILDINDEX sy-vline 
WA_MPL_TREE_STRUCTURE_STR-PARENTINDEX sy-vline 
WA_MPL_TREE_STRUCTURE_STR-CUOBJ sy-vline 
WA_MPL_TREE_STRUCTURE_STR-TECHS sy-vline 
WA_MPL_TREE_STRUCTURE_STR-SUPFID sy-vline 
WA_MPL_TREE_STRUCTURE_STR-PATH sy-vline 
WA_MPL_TREE_STRUCTURE_STR-PATH_HASHED sy-vline      INTO ld_text SEPARATED BY SPACE.

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