Markör för loop med dynamisk SQL-statement

Jag tror att du kan göra vad du vill med paketet DBMS_SQL.

Du kan också kontrollera dessa:

• Använda dynamisk SQL
• COLUMN_VALUE Procedur

Till exempel:

declare
  TYPE curtype IS REF CURSOR;
  src_cur      curtype;
  curid        NUMBER;
  namevar  VARCHAR2(50);
  numvar   NUMBER;
  datevar  DATE;
  desctab  DBMS_SQL.DESC_TAB;
  colcnt   NUMBER;
  dsql varchar2(1000) := 'select card_no from card_table where rownum = 1';
begin
  OPEN src_cur FOR dsql;

  -- Switch from native dynamic SQL to DBMS_SQL package.
  curid := DBMS_SQL.TO_CURSOR_NUMBER(src_cur);
  DBMS_SQL.DESCRIBE_COLUMNS(curid, colcnt, desctab);

  -- Define columns.
  FOR i IN 1 .. colcnt LOOP
    IF desctab(i).col_type = 2 THEN
      DBMS_SQL.DEFINE_COLUMN(curid, i, numvar);
    ELSIF desctab(i).col_type = 12 THEN
      DBMS_SQL.DEFINE_COLUMN(curid, i, datevar);
    ELSE
      DBMS_SQL.DEFINE_COLUMN(curid, i, namevar, 50);
    END IF;
  END LOOP;

  -- Fetch rows with DBMS_SQL package.
  WHILE DBMS_SQL.FETCH_ROWS(curid) > 0 LOOP
    FOR i IN 1 .. colcnt LOOP
      IF (desctab(i).col_type = 1) THEN
        DBMS_SQL.COLUMN_VALUE(curid, i, namevar);
        dbms_output.put_line(namevar);
      ELSIF (desctab(i).col_type = 2) THEN
        DBMS_SQL.COLUMN_VALUE(curid, i, numvar);
        dbms_output.put_line(numvar);
      ELSIF (desctab(i).col_type = 12) THEN
        DBMS_SQL.COLUMN_VALUE(curid, i, datevar);
        dbms_output.put_line(datevar);
      END IF;
    END LOOP;
  END LOOP;

  DBMS_SQL.CLOSE_CURSOR(curid);

end;