Обновить поле blob в interbase

]
f = open (text.txt, 'rb')
Text = f.read()
Cur = con.cursor()
Cur.execute("update name_table set name_blob_pole = ? Where id = ?", (Text,  43))
con.commit()

import interbase

import fdb
 
con = fdb.connect(dsn='localhost:/temp/test.db', user='sysdba', password='pass')
curScroll = con.cursor()
curUpdate = con.cursor()
 
curScroll.execute("select city from addresses for update")
curScroll.name = 'city_scroller'
update = "update addresses set city=? where current of " + curScroll.name
 
for (city,) in curScroll:
    city = text # make some changes to city в моем случае city равно text
    curUpdate.execute( update, (city,) )
 
con.commit()

# --- Materialized mode (str objects for both input and output) ---
# Insertion:
cur.execute("insert into blob_test values (?)", ('abcdef',))
cur.execute("insert into blob_test values (?)", ('ghijklmnop',))

import os.path
from cStringIO import StringIO
 
import interbase
...
# --- Streaming mode (file-like objects for input; interbase.BlobReader objects for output) ---
 
# Insertion:
cur.execute("insert into blob_test values (?)", (StringIO('abcdef'),))
cur.execute("insert into blob_test values (?)", (StringIO('ghijklmnop'),))
 
f = file(os.path.abspath(__file__), 'rb')
cur.execute("insert into blob_test values (?)", (f,))
f.close()

cur.execute("Update name_table set name column = ? Where id=?", (1, 'ffggghhh'))
con.commit()

cur.execute("Update name_table set name column = 'ffgggghhh' Where id=1")
con.commit()