Database Access with Jython, Hibernate and SQLAlchemy · Database Access with Jython, Hibernate and SQLAlchemy Frank Wierzbicki, Jython Project Lead ... As if Hibernate needs an introduction

Database Access with Jython, Hibernate and SQLAlchemy

Frank Wierzbicki, Jython Project Lead

http://www.jython.org

2008 JavaOneSM Conference | java.sun.com/javaone | 2

Why Jython?

Jython brings the Python language to the JVM™ technologyPython is a very mature language which was designed to be easy to pick up but powerful to useJython has full and nearly seamless integration into any Java™ platform and codeJython can access many of the libraries and frameworks written in Python


Basic Jython Demo


DB-API, JDBC™ API, and Jython

Jython has built in support for DB-API, Python's standard database interface in the zxJDBC packagezxJDBC is a thin wrapper around JDBC API, Java platform's standard database interfacePython programmers get access to any database with a JDBC API driverJava platform programmers get access to any Python frameworks that are built on DB-API


Basic Connectionfrom com.ziclix.python.sql import zxJDBCtry: cursor = None db = None try: db = zxJDBC.connect("jdbc:mysql://localhost/test", 'user', 'pass', "org.gjt.mm.mysql.Driver") cursor = db.cursor()

cursor.execute("select name from user") for row in cursor.fetchall(): print row finally: if cursor is not None: cursor.close() if db is not None: db.close()except Exception, reason: print reason


Connection from DataSource#Use connectx if you are connecting to a DataSource.#This is often useful when you are working from an#application server that uses connection pooling

from com.ziclix.python.sql import zxJDBCdbInfo = {'user':'username', 'password':'pass', 'mydb':'test', 'server':'localhost', 'port':3306}con = zxJDBC.connectx("org.gjt.mm.mysql.MysqlDataSource", **dbInfo)

#Or you can connect via JNDIfactory = "com.sun.jndi.fscontext.RefFSContextFactory"db = zxJDBC.lookup('context/myDataSource'), INITIAL_CONTEXT_FACTORY=factory)


Using Swing Tables From Jython

from javax.swing import JTablefrom javax.swing import JFrame

rowdata = [('bill', 'Bill Williams')]colnames = ['user name', 'full name']table = JTable(rowdata, colnames)frame = JFrame("Table")frame.getContentPane().add( table )frame.size = 400, 300frame.visible = 1


Basic zxJDBC DemoDB-API and JDBC API taste great together


Object Relational Mappings (ORMs)

Handling raw SQL in object oriented programs can feel tedious for many programming tasksObject Relational Mappers help make Table based data feel more like objects from an OO style programTwo styles of ORM in common use: Active Record and MapperHandling raw SQL in object oriented programs can feel tedious for many programming tasksObject Relational Mappers help make Sun Access Table Editor™ (Table) software based data feel more like objects from an OO style program


Active Record

Active Record style ORMs tend to be simpler to useGenerally there is a one to one mapping between tables and objectsVery easy to reason about the relationships between objects and tablesDjango uses an active record pattern


Django Demo


Data Mapper

Data Mapper style ORMs are more “DBA friendly – DBAs don't like 1:1 object:tableThe mapping between objects and tables needs to be more explicitData Mappers tend to be more flexible and can be used for harder problems (for example: legacy databases that can't be made to fit ActiveRecord)


Hibernate

As if Hibernate needs an introduction here :)Hibernate is a native Java platform ORM based on Data MapperVery mature, very stable technologyHas a very good reputationHas a huge install base


Hibernate From Jython Demo


SQLAlchemy

Data Mapper style ORMs are more “DBA friendly – DBAs don't like 1:1 object:tableThe mapping between objects and tables needs to be more explicitData Mappers tend to be more flexible and can be used for harder problems (for example: many existing databases that can't be made to fit ActiveRecord)


SQLAlchemy Demo


For More Information

http://www.python.orghttp://wiki.python.org/jython


Frank Wierzbicki

http://www.jython.org


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Database Access with Jython, Hibernate and SQLAlchemy · Database Access with Jython, Hibernate and SQLAlchemy Frank Wierzbicki, Jython Project Lead ... As if Hibernate needs an introduction