ABAP Select data from SAP table ROIJ_LB_SELTREE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ROIJ_LB_SELTREE
*  INTO TABLE @DATA(IT_ROIJ_LB_SELTREE2).
*--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_ROIJ_LB_SELTREE INDEX 1 INTO DATA(WA_ROIJ_LB_SELTREE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ROIJ_LB_SELTREE>-TSYST = 1.
<ROIJ_LB_SELTREE>-LOCID = 1.
<ROIJ_LB_SELTREE>-PMATNR = 1.
<ROIJ_LB_SELTREE>-LOCTYP = 1.
<ROIJ_LB_SELTREE>-LBUOM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ROIJ_LB_SELTREE-PLANLOC, sy-vline,
  WA_ROIJ_LB_SELTREE-PLANIND, sy-vline,
  WA_ROIJ_LB_SELTREE-SUBLOC, sy-vline,
  WA_ROIJ_LB_SELTREE-TSNAM, sy-vline,
  WA_ROIJ_LB_SELTREE-LOCNAM, sy-vline,
  WA_ROIJ_LB_SELTREE-PMATNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ROIJ_LB_SELTREE 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_ROIJ_LB_SELTREE 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_ROIJ_LB_SELTREE INTO WA_ROIJ_LB_SELTREE.


*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 PMATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_ROIJ_LB_SELTREE-PMATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ROIJ_LB_SELTREE-PMATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field LBUOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ROIJ_LB_SELTREE-LBUOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ROIJ_LB_SELTREE-LBUOM.
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_ROIJ_LB_SELTREE_STR, 
TSYST TYPE STRING,
LOCID TYPE STRING,
PMATNR TYPE STRING,
LOCTYP TYPE STRING,
LBUOM TYPE STRING,
PLANLOC TYPE STRING,
PLANIND TYPE STRING,
SUBLOC TYPE STRING,
TSNAM TYPE STRING,
LOCNAM TYPE STRING,
PMATNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ROIJ_LB_SELTREE_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_ROIJ_LB_SELTREE_STR-TSYST sy-vline 
WA_ROIJ_LB_SELTREE_STR-LOCID sy-vline 
WA_ROIJ_LB_SELTREE_STR-PMATNR sy-vline 
WA_ROIJ_LB_SELTREE_STR-LOCTYP sy-vline 
WA_ROIJ_LB_SELTREE_STR-LBUOM sy-vline 
WA_ROIJ_LB_SELTREE_STR-PLANLOC sy-vline 
WA_ROIJ_LB_SELTREE_STR-PLANIND sy-vline 
WA_ROIJ_LB_SELTREE_STR-SUBLOC sy-vline 
WA_ROIJ_LB_SELTREE_STR-TSNAM sy-vline 
WA_ROIJ_LB_SELTREE_STR-LOCNAM sy-vline 
WA_ROIJ_LB_SELTREE_STR-PMATNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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