Ekspresi salah tipe saat memanggil fungsi menggunakan cx_Oracle

Mengikuti saran kfinity tentang penggunaan anonim pembungkus blok dan pertanyaan yang mirip , kode berikut akan berfungsi:

outVal = cursor.var(int)
phase = cursor.var(cx_Oracle.STRING)
status = cursor.var(cx_Oracle.STRING)
dev_phase = cursor.var(cx_Oracle.STRING)
dev_status = cursor.var(cx_Oracle.STRING)
message = cursor.var(cx_Oracle.STRING)
sql="""
  begin
    :outVal := sys.diutil.bool_to_int(
        fnd_concurrent.wait_for_request(
            :id,
            :interval, 
            :max_wait,
            :phase,
            :status,
            :dev_phase,
            :dev_status,
            :message
        )
    );
  end;
  """
cursor.execute( 
    sql,
    outVal=outVal,
    id='141116467',
    interval='1',
    max_wait='1',
    phase=phase,
    status=status,
    dev_phase=dev_phase,
    dev_status=dev_status,
    message=message
)
print(outVal.getvalue())