# This script requires cx_Oracle 8.2 and higher.
#------------------------------------------------------------------------------
import cx_Oracle as oracledb
import sample_env
QUEUE_NAME = "DEMO_RAW_QUEUE"
PAYLOAD_DATA = [
"The first message",
"The second message",
"The third message",
"The fourth and final message"
]
# connect to database
connection = oracledb.connect(sample_env.get_main_connect_string())
cursor = connection.cursor()
# create queue
queue = connection.queue(QUEUE_NAME)
queue.deqoptions.wait = oracledb.DEQ_NO_WAIT
queue.deqoptions.navigation = oracledb.DEQ_FIRST_MSG
# dequeue all existing messages to ensure the queue is empty, just so that
# the results are consistent
while queue.deqone():
pass
# enqueue a few messages
print("Enqueuing messages...")
for data in PAYLOAD_DATA:
# cx_Oracle. It makes use of a RAW queue created in the sample setup.
#
# This script requires cx_Oracle 7.2 and higher.
#------------------------------------------------------------------------------
import cx_Oracle
import sample_env
QUEUE_NAME = "DEMO_RAW_QUEUE"
PAYLOAD_DATA = [
"The first message", "The second message", "The third message",
"The fourth and final message"
]
# connect to database
connection = cx_Oracle.connect(sample_env.get_main_connect_string())
cursor = connection.cursor()
# create queue
queue = connection.queue(QUEUE_NAME)
queue.deqOptions.wait = cx_Oracle.DEQ_NO_WAIT
queue.deqOptions.navigation = cx_Oracle.DEQ_FIRST_MSG
# dequeue all existing messages to ensure the queue is empty, just so that
# the results are consistent
while queue.deqOne():
pass
# enqueue a few messages
print("Enqueuing messages...")
for data in PAYLOAD_DATA:
def cursor(self):
return Cursor(self)
class Cursor(cx_Oracle.Cursor):
def execute(self, statement, args = None):
prepare_needed = (self.statement != statement)
result = super(Cursor, self).execute(statement, args or [])
if prepare_needed:
description = self.description
if description:
names = [d[0] for d in description]
self.rowfactory = collections.namedtuple("GenericQuery", names)
return result
# create new subclassed connection and cursor
connection = Connection(sample_env.get_main_connect_string())
cursor = connection.cursor()
# the names are now available directly for each query executed
for row in cursor.execute("select ParentId, Description from ParentTable"):
print(row.PARENTID, "->", row.DESCRIPTION)
print()
for row in cursor.execute("select ChildId, Description from ChildTable"):
print(row.CHILDID, "->", row.DESCRIPTION)
print()
def __init__(self):
connect_string = sample_env.get_main_connect_string()
print("CONNECT to database")
return super(Connection, self).__init__(connect_string)
# This script requires cx_Oracle 8.2 and higher.
#------------------------------------------------------------------------------
import cx_Oracle as oracledb
import sample_env
STRING_VAL = 'I bought a cafetière on the Champs-Élysées'
def return_strings_as_bytes(cursor, name, default_type, size, precision,
scale):
if default_type == oracledb.DB_TYPE_VARCHAR:
return cursor.var(str, arraysize=cursor.arraysize, bypass_decode=True)
with oracledb.connect(sample_env.get_main_connect_string()) as conn:
# truncate table and populate with our data of choice
with conn.cursor() as cursor:
cursor.execute("truncate table TestTempTable")
cursor.execute("insert into TestTempTable values (1, :val)",
val=STRING_VAL)
conn.commit()
# fetch the data normally and show that it is returned as a string
with conn.cursor() as cursor:
cursor.execute("select IntCol, StringCol from TestTempTable")
print("Data fetched using normal technique:")
for row in cursor:
print(row)
print()
