bill.util.persist
Class EntityDataFactoryRDBMS

java.lang.Object
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  +--bill.util.persist.EntityDataFactory
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        +--bill.util.persist.EntityDataFactoryRDBMS

public abstract class EntityDataFactoryRDBMS

extends EntityDataFactory

Factory for RDBMS entities. The factory contains data and access methods specific to a RDBMS persistence implementation. This includes logic to retrieve "sequence" numbers.

Fields inherited from class bill.util.persist.EntityDataFactory

_connection

Constructor Summary

EntityDataFactoryRDBMS()

Method Summary

static Connection	getDBConnection() Retrieve a database connection for our use in manipulating the database's data.
static long	getNextSequence(String sequenceName) Gets the next sequence value for the specified sequence name.

Methods inherited from class bill.util.persist.EntityDataFactory

getConnection, setConnection

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EntityDataFactoryRDBMS

public EntityDataFactoryRDBMS()

Method Detail

getDBConnection

public static Connection getDBConnection()

Retrieve a database connection for our use in manipulating the database's data. This is a convenient way of calling getConnection that returns us a Connection rather than an Object, saving us from constantly typecasting.

Returns:

The database connection.

getNextSequence

public static long getNextSequence(String sequenceName)

Gets the next sequence value for the specified sequence name. This method is serialized to make sure we do not hand out the same sequence value to multiple callers. Sequences are stored in a "sequence" database table. After retrieving the next sequence value we increment the databases next sequence value.

Parameters:

sequenceName - The name of the sequence to retrieve.

Returns:

The retrieved sequence value.