Connecting Data Virtuality Server from Python using JDBC Driver and JayDeBeApi

JayDeBeApi

The JayDeBeApi module allows to connect from Python code to various databases using Java JDBC drivers and a JDBC URL. It provides a Python DB-API v2.0 to the Data Virtuality Server.

The module can be installed via pip:

$ pip install jaydebeapi

Data Virtuality JDBC Driver

The Data Virtuality JDBC Driver can be achieved either from a Data Virtuality Server instance or from the Data Virtuality Driver download area.

To connect using a JDBC driver, a vendor specific driver class and JDBC URL are needed.

For the Data Virtuality Server these are:

Driver class:
com.datavirtuality.dv.jdbc.Driver

JDBC URL:
jdbc:datavirtuality:<Virtual Database>@mm[s]//<host>:<port>;

The components of the URL are as following:

• <virtual database> - Name of the Virtual Database (VDB) to connect to. Unless Multiple VDBs are used, this the name of the VDB is "datavirtuality".
• mm - Data Virtuality JDBC protocol for a connection not using SSL
  mms - Data Virtuality JDBC protocol for a connection using SSL
• <host> - Data Virtuality Server address.
• <port> - Data Virtuality Server port incoming JDBC connections. Per default the port for connections using SSL is 31001, the port for connections not using SSL is 31000.

Connect to Data Virtuality Server

Jaydebeapi.connect()

The jaydebeapi.connect() method has the following signature:

jaydebeapi.connect(jclassname, url, driver_args, jars, libs)

Providing

• com.datavirtuality.dv.jdbc.Driver as jclassname
• jdbc:datavirtuality:datavirtuality@mms://localhost:31001 as url
• [admin, admin] as driver_args
• "C:/datavirtuality/jdbc/datavirtuality-jdbc.jar" as jars,

the code to connect via jaydebapi to a Data Virtuality Server looks like that:

import jaydebeapi
 
jaydebeapi.connect(com.datavirtuality.dv.jdbc.Driver, jdbc:datavirtuality:datavirtuality@mms://localhost:31001, [admin, admin], "C:/datavirtuality/jdbc/datavirtuality-jdbc.jar")
 
cur = con.cursor()
cur.execute("select * from <schema>.<table>")
cur.fetchall()

Full sample

import jaydebeapi
 
# Data Virtuality Server Details
host = "localhost"
port = "31001"
database = "datavirtuality"
use_ssl = True
uid = "admin"
pwd = "admin"
 
# Data Virtuality JDBC class name
driver_class = "com.datavirtuality.dv.jdbc.Driver"
 
# Data Virtuality Server driver file (full path)
driver_file = "C:/datavirtuality/jdbc/datavirtuality-jdbc.jar"
 
# JDBC connection string
if (use_ssl):
 connection_string="jdbc:datavirtuality:{}@mms://{}:{}".format(database, host, port)
else:
 connection_string="jdbc:datavirtuality:{}@mm://{}:{}".format(database, host, port)
 
# Establish JDBC connection
con = jaydebeapi.connect(driver_class, connection_string, [uid, pwd], driver_file,)
 
cur = con.cursor()
cur.execute("select * from <schema>.<table>")
cur.fetchall()