Select from database dynamically

Question

Hello colleague,
i am trying to read a database whose name is dynamically identified. There are several fields but i am interested in one. I want all the entries for that field in the table. The field "trace_fct_id" is type SYSUUID_x(16). I want it to be populated in the CHAR32 field ie GUID.
  LOOP AT lt_tabname INTO ls_tablename.
    CREATE DATA dref TYPE STANDARD TABLE OF (ls_tablename-name).
    ASSIGN dref->* TO <itab>.
    SELECT DISTINCT trace_fct_id FROM (ls_tablename-name) INTO CORRESPONDING FIELDS OF TABLE <itab>.
    MOVE <itab> TO et_func_ids.
  ENDLOOP.
I get all the entries from the table but i just want to return the ID, and the move does not copy it in the internal table as the column name is different.
Could you please help?
Thanks in advance.
Best Regards,
Piyush

Answer 1

Check if this helps:
DATA: dref TYPE REF TO data,
      lt_tabname TYPE STANDARD TABLE OF tabname,
      ls_tablename TYPE tabname,
      et_func_ids TYPE STANDARD TABLE OF sysuuid_x,
      es_func_ids TYPE sysuuid_x.
FIELD-SYMBOLS: <itab> TYPE STANDARD TABLE,
               <wa> TYPE ANY ,
               <val> TYPE ANY.
DATA: v_err TYPE string,
      lcx_root TYPE REF TO cx_root.
LOOP AT lt_tabname INTO ls_tablename.
  CREATE DATA dref TYPE STANDARD TABLE OF (ls_tablename).
  ASSIGN dref->* TO <itab>.
  TRY .
      SELECT DISTINCT trace_fct_id FROM (ls_tablename)
      INTO CORRESPONDING FIELDS OF TABLE <itab>.
      CHECK sy-subrc = 0.
      LOOP AT <itab> ASSIGNING <wa>.
        ASSIGN COMPONENT 'TRACE_FCT_ID' OF STRUCTURE <wa> TO <val>.
        CHECK sy-subrc = 0.
        es_func_ids = <val>.
        APPEND es_func_ids TO et_func_ids.
        CLEAR et_func_ids.
      ENDLOOP.
    CATCH cx_sy_open_sql_error INTO lcx_root."Catch block for SQL errors
      v_err = lcx_root->get_text( ).
      WRITE: / v_err.
  ENDTRY.
  REFRESH <itab>.
ENDLOOP.
BR,
Suhas