ABAP Select data from SAP table MPES_RTGV_TREE_STRUC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MPES_RTGV_TREE_STRUC
*  INTO TABLE @DATA(IT_MPES_RTGV_TREE_STRUC2).
*--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_MPES_RTGV_TREE_STRUC INDEX 1 INTO DATA(WA_MPES_RTGV_TREE_STRUC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MPES_RTGV_TREE_STRUC>-DESCRIPTION = 1.
<MPES_RTGV_TREE_STRUC>-OAN_ELEMENT_NUMBER_EXT = 1.
<MPES_RTGV_TREE_STRUC>-LINK_TO_PREDEC_ELEMENT = 1.
<MPES_RTGV_TREE_STRUC>-TEMPLATE_REFERENCE_OBJECT = 1.
<MPES_RTGV_TREE_STRUC>-SEGMENTTEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MPES_RTGV_TREE_STRUC-EDITABLE, sy-vline,
  WA_MPES_RTGV_TREE_STRUC-NOT_CHANGEABLE, sy-vline,
  WA_MPES_RTGV_TREE_STRUC-STATE, sy-vline,
  WA_MPES_RTGV_TREE_STRUC-IS_MOVED, sy-vline,
  WA_MPES_RTGV_TREE_STRUC-MAINSTATUSTEXT, sy-vline,
  WA_MPES_RTGV_TREE_STRUC-ON_HOLD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MPES_RTGV_TREE_STRUC 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_MPES_RTGV_TREE_STRUC 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_MPES_RTGV_TREE_STRUC INTO WA_MPES_RTGV_TREE_STRUC.


*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 OAN_ELEMENT_NUMBER_EXT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MPES_RTGV_TREE_STRUC-OAN_ELEMENT_NUMBER_EXT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPES_RTGV_TREE_STRUC-OAN_ELEMENT_NUMBER_EXT.
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_MPES_RTGV_TREE_STRUC_STR, 
DESCRIPTION TYPE STRING,
OAN_ELEMENT_NUMBER_EXT TYPE STRING,
LINK_TO_PREDEC_ELEMENT TYPE STRING,
TEMPLATE_REFERENCE_OBJECT TYPE STRING,
SEGMENTTEXT TYPE STRING,
EDITABLE TYPE STRING,
NOT_CHANGEABLE TYPE STRING,
STATE TYPE STRING,
IS_MOVED TYPE STRING,
MAINSTATUSTEXT TYPE STRING,
ON_HOLD TYPE STRING,
HOLD_NMBR TYPE STRING,
CHANGE_STAT_SCR TYPE STRING,
STAT_GEN_SCR TYPE STRING,
STAT_DEF_SCR TYPE STRING,
STAT_EFF_SCR TYPE STRING,
STAT_MBOM_SCR TYPE STRING,
STAT_COMP_SCR TYPE STRING,
STAT_LCOMP_SCR TYPE STRING,
STAT_OASEL_SCR TYPE STRING,
STAT_WI_SCR TYPE STRING,
STAT_IC_SCR TYPE STRING,
STAT_PRT_SCR TYPE STRING,
STAT_DOCS_SCR TYPE STRING,
STAT_QUAL_SCR TYPE STRING,
STAT_BUY_SCR TYPE STRING,
STAT_ATH_SCR TYPE STRING,
STAT_PRED_SCR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MPES_RTGV_TREE_STRUC_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_MPES_RTGV_TREE_STRUC_STR-DESCRIPTION sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-OAN_ELEMENT_NUMBER_EXT sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-LINK_TO_PREDEC_ELEMENT sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-TEMPLATE_REFERENCE_OBJECT sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-SEGMENTTEXT sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-EDITABLE sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-NOT_CHANGEABLE sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STATE sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-IS_MOVED sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-MAINSTATUSTEXT sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-ON_HOLD sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-HOLD_NMBR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-CHANGE_STAT_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_GEN_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_DEF_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_EFF_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_MBOM_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_COMP_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_LCOMP_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_OASEL_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_WI_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_IC_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_PRT_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_DOCS_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_QUAL_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_BUY_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_ATH_SCR sy-vline 
WA_MPES_RTGV_TREE_STRUC_STR-STAT_PRED_SCR sy-vline      INTO ld_text SEPARATED BY SPACE.

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