I have reviewed the error on Stackoverflow, but none of the solutions I've seen resolve my problem. I'm attempting to create a class for cx_Oracle to put my database connectivity in a class, and call it during my database instances. I've created similar classes in C#, but python is especially difficult for some reason. Any assistance appreciated.
I leveraged this code found here: cx_Oracle and Exception Handling - Good practices?
import sys
import os
import cx_Oracle
class Oracle(object):
__db_server = os.getenv("ORACLE_SERVER")
__db_user = os.getenv("ORACLE_ACCT")
__db_password = os.getenv("ORACLE_PWD")
def connect(self):
""" Connect to the database. """
try:
self.db = cx_Oracle.connect(__db_user+'/'+__db_password+'@'+__db_server)
except cx_Oracle.DatabaseError as e:
error, = e.args
if error.code == 1017:
print('Please check your credentials.')
else:
print('Database connection error: %s'.format(e))
# Very important part!
raise
# If the database connection succeeded create the cursor
# we-re going to use.
self.cursor = db.Cursor()
def disconnect(self):
"""
Disconnect from the database. If this fails, for instance
if the connection instance doesn't exist we don't really care.
"""
try:
self.cursor.close()
self.db.close()
except cx_Oracle.DatabaseError:
pass
def execute(self, sql, bindvars=None, commit=False):
"""
Execute whatever SQL statements are passed to the method;
commit if specified. Do not specify fetchall() in here as
the SQL statement may not be a select.
bindvars is a dictionary of variables you pass to execute.
"""
try:
self.cursor.execute(sql, bindvars)
except cx_Oracle.DatabaseError as e:
error, = e.args
if error.code == 955:
print('Table already exists')
elif error.code == 1031:
print("Insufficient privileges")
print(error.code)
print(error.message)
print(error.context)
# Raise the exception.
raise
# Only commit if it-s necessary.
if commit:
self.db.commit()
def select(self, sql, commit=False):
bindvars=None
result = None
try:
self.cursor.execute(sql, bindvars)
result = self.cursor.fetchall()
except cx_Oracle.DatabaseError as e:
error, = e.args
print "Database Error: failed with error code:%d - %s" % (error.code, error.message)
raise
if commit:
self.db.commit()
return result
def commit(self):
try:
self.db.commit()
except cx_Oracle.DatabaseError as e:
error, = e.args
print "Database Commit failed with error code:%d - %s" % (error.code, error.message)
raise
def rollback(self):
try:
self.db.rollback()
except cx_Oracle.DatabaseError as e:
error, = e.args
print "Database Rollback failed with error code:%d - %s" %(error.code, error.message)
raise
And this is my calling routine
import sys
import os
#import cx_Oracle
from Oracle import Oracle
def main():
oracle = Oracle.connect()
query = """SELECT DISTINCT NAME FROM MyTable"""
data = oracle.select(query)
for row in data:
print row
oracle.disconnect()
### MAIN
if __name__ == '__main__':
main()
On a related note: I can't seem to get Python to find my Oracle.py class, unless it's in the same directory as the calling function.
Allan
