ABAP Select data from SAP table CSMNAMETREE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CSMNAMETREE
*  INTO TABLE @DATA(IT_CSMNAMETREE2).
*--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_CSMNAMETREE INDEX 1 INTO DATA(WA_CSMNAMETREE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CSMNAMETREE>-MTSYSID = 1.
<CSMNAMETREE>-MTETYPE = 1.
<CSMNAMETREE>-MTESUBTYPE = 1.
<CSMNAMETREE>-MTDISPLAYNM = 1.
<CSMNAMETREE>-MTLONGNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CSMNAMETREE-MTECLASS, sy-vline,
  WA_CSMNAMETREE-ALTREENUM, sy-vline,
  WA_CSMNAMETREE-ALIDXINTRE, sy-vline,
  WA_CSMNAMETREE-ALLEVINTRE, sy-vline,
  WA_CSMNAMETREE-ALPARINTRE, sy-vline,
  WA_CSMNAMETREE-TIDSTRING, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CSMNAMETREE 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_CSMNAMETREE 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_CSMNAMETREE INTO WA_CSMNAMETREE.


*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_CSMNAMETREE_STR, 
MTSYSID TYPE STRING,
MTETYPE TYPE STRING,
MTESUBTYPE TYPE STRING,
MTDISPLAYNM TYPE STRING,
MTLONGNAME TYPE STRING,
MTECLASS TYPE STRING,
ALTREENUM TYPE STRING,
ALIDXINTRE TYPE STRING,
ALLEVINTRE TYPE STRING,
ALPARINTRE TYPE STRING,
TIDSTRING TYPE STRING,
RC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CSMNAMETREE_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_CSMNAMETREE_STR-MTSYSID sy-vline 
WA_CSMNAMETREE_STR-MTETYPE sy-vline 
WA_CSMNAMETREE_STR-MTESUBTYPE sy-vline 
WA_CSMNAMETREE_STR-MTDISPLAYNM sy-vline 
WA_CSMNAMETREE_STR-MTLONGNAME sy-vline 
WA_CSMNAMETREE_STR-MTECLASS sy-vline 
WA_CSMNAMETREE_STR-ALTREENUM sy-vline 
WA_CSMNAMETREE_STR-ALIDXINTRE sy-vline 
WA_CSMNAMETREE_STR-ALLEVINTRE sy-vline 
WA_CSMNAMETREE_STR-ALPARINTRE sy-vline 
WA_CSMNAMETREE_STR-TIDSTRING sy-vline 
WA_CSMNAMETREE_STR-RC sy-vline      INTO ld_text SEPARATED BY SPACE.

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