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rs_ibmdbdbi.py
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rs_ibmdbdbi.py
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# Environment setup
# pip3 install --upgrade ibm-db
#-------------------------------------------------------
# Module: rs_ibmdbdbi.py
# Desc: This module contains our IBM i database class
# for access IBM i DB2 data via ibm_db_dbi.
# Note: Currently connections to NOT use committment control.
#-------------------------------------------------------
#-------------------------------------------------------
# Class: DbIbmDbDbi
# Desc: This class is a wrapper class around IBM i ibm_db_dbi functions
#-------------------------------------------------------
import ibm_db_dbi as db2
from ibm_db_dbi import SQL_ATTR_TXN_ISOLATION, SQL_TXN_NO_COMMIT
import uuid
class DbIbmDbDbi():
# Class variables
_dbopen=False
_dbconn=None
_dbconnstring=""
def __init__(self,db_connectnow=None):
#-------------------------------------------------------
# Function: __init__
# Desc: Constructor
# :param self: Object instance
# :param db_file: File name or default to None if no file
# needs to be opened yet
# :return: Connection or None on error
#-------------------------------------------------------
try:
_dbopen=False
_dbconn=None
if db_connectnow != None and db_connectnow != False:
self.create_connection()
else:
print("No connection option passed in. Need to create connection later.")
except Exception as e:
print(e)
finally:
return None #Can return None or omit any return
def isopen(self):
#-------------------------------------------------------
# Function: isopen
# Desc: Check if database is open
# :param self: Pointer to object instance.
# :return: True-Db is open, False=Db is not open
#-------------------------------------------------------
#return DB open status
return self._dbopen
def getconn(self):
#-------------------------------------------------------
# Function: getconn
# Desc: Get database connection object
# :param self: Pointer to object instance.
# :return: Connection value
#-------------------------------------------------------
#return conn object
return self._dbconn
def create_connection(self):
#-------------------------------------------------------
# Function: create_connection
# Desc: Create a database connection to IBMi database via ibm_db
# :param self: Pointer to object instance.
# :return: True-Connection open, False-No connection open
#-------------------------------------------------------
#Create connection variable
conn = None
#Let's try and open the database. Will auto-create if not found.
try:
conn=db2.connect()
# No commitment control
conn.set_option({ SQL_ATTR_TXN_ISOLATION: SQL_TXN_NO_COMMIT })
# Set open flag = true
if conn != None:
#Save open connection info internally in the class
self._dbopen=True
self._dbconn = conn
return self._dbopen;
except Exception as e:
print(e)
return False
def close_connection(self):
#-------------------------------------------------------
# Function: close_connection
# Desc: Close a database connection to a db2 database
# :param self: Pointer to object instance.
# :return: True-Success, False-Error
#-------------------------------------------------------
# Let's attempt to close our database connection
try:
self._dbconn.close()
#Release object. Not sure if needed or automatic ?
conn=None
self._dbconn=None
return True;
except Exception as e:
print(e)
return False
def execute(self,sql,parameters=None):
#----------------------------------------------------------
# Function: execute
# Desc: Execute an SQL action query that does not return results
# :param self: Pointer to object instance.
# :param sql: SQL action query
# :return: True-Success, False-Error
#----------------------------------------------------------
try:
cursor1 = self._dbconn.cursor()
cursor1.execute(sql,parameters)
return True
except Exception as e:
print(e)
return False
def callproc(self,procname,parameters=None):
#----------------------------------------------------------
# Function: execute
# Desc: Execute a stored procedure
# :param self: Pointer to object instance.
# :param sql: SQL action query
# :return: results or None on error
#----------------------------------------------------------
try:
cursor1 = self._dbconn.cursor()
result=cursor1.callproc(procname,parameters)
return result
except Exception as e:
print(e)
return None
def execute_query(self,sql):
#----------------------------------------------------------
# Function: execute_query
# Desc: Execute an SQL query that does return results
# :param self: Pointer to object instance.
# :param sql: SQL query expecting results
# :return: Resulting cursor or None on error
#----------------------------------------------------------
try:
cursor1 = self._dbconn.cursor()
cursor1.execute(sql)
return cursor1
except Exception as e:
print(e)
return None
def getnewguid(self):
#----------------------------------------------------------
# Function: getnewguid
# Desc: Generate new GUID using the uuid1 function
# :param self: Pointer to object instance.
# :return: Resulting guid or None
#----------------------------------------------------------
try:
# generate the guid (uuid1)
return str(uuid.uuid1())
except Error as e:
print(e)
return None