How do I read cx_Oracle.LOB data in Python?

Question

I have this code:

    dsn = cx_Oracle.makedsn(hostname, port, sid)
    orcl = cx_Oracle.connect(username + \'/\' + password + \'@\' + dsn)
    curs = orcl.cu         


        

Answer 1

I've found out that this happens in case when connection to Oracle is closed before the cx_Oracle.LOB.read() method is used.

orcl = cx_Oracle.connect(usrpass+'@'+dbase)
c = orcl.cursor()
c.execute(sq)
dane =  c.fetchall()

orcl.close() # before reading LOB to str

wkt = dane[0][0].read()

And I get: DatabaseError: Invalid handle!
But the following code works:

orcl = cx_Oracle.connect(usrpass+'@'+dbase)
c = orcl.cursor()
c.execute(sq)
dane =  c.fetchall()

wkt = dane[0][0].read()

orcl.close() # after reading LOB to str