ABAP Select data from SAP table DB2TREORG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2TREORG 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 DB2TREORG. 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 DB2TREORG 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_DB2TREORG TYPE STANDARD TABLE OF DB2TREORG,
      WA_DB2TREORG TYPE DB2TREORG,
      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: <DB2TREORG> TYPE DB2TREORG.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2TREORG.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2TREORG
  INTO TABLE IT_DB2TREORG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2TREORG
*  INTO TABLE @DATA(IT_DB2TREORG2).
*--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_DB2TREORG INDEX 1 INTO DATA(WA_DB2TREORG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2TREORG ASSIGNING <DB2TREORG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2TREORG>-DB2TOWNER = 1.
<DB2TREORG>-DB2TNAME = 1.
<DB2TREORG>-DB2TSPACE = 1.
<DB2TREORG>-DB2TSIZE = 1.
<DB2TREORG>-DB2F1 = 1.

ENDLOOP.

LOOP AT IT_DB2TREORG INTO WA_DB2TREORG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2TREORG-DB2F2, sy-vline,
  WA_DB2TREORG-DB2F3, sy-vline,
  WA_DB2TREORG-DB2REORG, sy-vline,
  WA_DB2TREORG-DB2DATETIM, sy-vline,
  WA_DB2TREORG-DB2RUNTIME, sy-vline,
  WA_DB2TREORG-DB2REODATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2TREORG 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_DB2TREORG 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_DB2TREORG INTO WA_DB2TREORG.


*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_DB2TREORG_STR, 
DB2TOWNER TYPE STRING,
DB2TNAME TYPE STRING,
DB2TSPACE TYPE STRING,
DB2TSIZE TYPE STRING,
DB2F1 TYPE STRING,
DB2F2 TYPE STRING,
DB2F3 TYPE STRING,
DB2REORG TYPE STRING,
DB2DATETIM TYPE STRING,
DB2RUNTIME TYPE STRING,
DB2REODATE TYPE STRING,
QUALNUM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2TREORG_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_DB2TREORG_STR-DB2TOWNER sy-vline 
WA_DB2TREORG_STR-DB2TNAME sy-vline 
WA_DB2TREORG_STR-DB2TSPACE sy-vline 
WA_DB2TREORG_STR-DB2TSIZE sy-vline 
WA_DB2TREORG_STR-DB2F1 sy-vline 
WA_DB2TREORG_STR-DB2F2 sy-vline 
WA_DB2TREORG_STR-DB2F3 sy-vline 
WA_DB2TREORG_STR-DB2REORG sy-vline 
WA_DB2TREORG_STR-DB2DATETIM sy-vline 
WA_DB2TREORG_STR-DB2RUNTIME sy-vline 
WA_DB2TREORG_STR-DB2REODATE sy-vline 
WA_DB2TREORG_STR-QUALNUM sy-vline      INTO ld_text SEPARATED BY SPACE.

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