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and its associated attribute in the domain
object. The <property> elements represent
all other attributes available in the domain
object.
The <generator> method is used to
generate the primary key for the new record.
Here is some of the commonly used
generators:
- Increment - This is used to generate
primary keys of type long, short or int
that are unique only. It should not be
used in the clustered deployment
environment.
- Sequence - Hibernate can also use the
sequences to generate the primary key.
It can be used with DB2, PostgreSQL,
Oracle, and SAP DB databases.
- Assigned - Assigned method is used
when application code generates the
primary key.
IV. Hibernate Configuration File
Hibernate configuration file contains information
that are essential to connect to persistent layer
and the linked mapping documents.
In this application, Hibernate provides
connection pooling and transaction
management for simplicity. It uses the “hibernate.cfg.xml” Hibernate configuration
file to create the connection pool and setup
required environment. This file required either
the Data Source Name or JDBC details to
hibernate for making JDBC connection to the
database. In this file we have given JDBC details.
Here is the code for hibernate.cfg.xml:
<?xml version=’1.0' encoding=’utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
“-//Hibernate/Hibernate Configuration DTD//
EN”
“http://hibernate.sourceforge.net/hibernateconfiguration-
3.0.dtd”>
<hibernate-configuration>
<session-factory>
<property
name=”hibernate.connection.driver_class”> |
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com.mysql.jdbc.Driver</property>
<property
name=”hibernate.connection.url”>jdbc:mysql:/
/192.168.10.52/hibernatetutorial</property>
<property
name=”hibernate.connection.username”>root</
property>
<property
name=”hibernate.connection.password”>root</
property>
<property
name=”hibernate.connection.pool_size”>10</
property>
<property name=”show_sql”>true</
property>
<property
name=”dialect”>org.hibernate.dialect.MySQLDialect</
property>
<property
name=”hibernate.hbm2ddl.auto”>update</
property>
<!— Mapping files —>
<mapping resource=”contact.hbm.xml”/>
</session-factory>
</hibernate-configuration> |
In the above configuration file we have specified
the database “hibernatetutorial” which is
running on server and the user of the database
is root with its password.
The dialect property “org.hibernate.dialect.MySQLDialect” tells
the Hibernate that we are using MySQL Database. Hibernate supports many database.
We can use the following databases dialect type
property to connect its related database:
- DB2 - org.hibernate.dialect.DB2Dialect
- HypersonicSQL -
org.hibernate.dialect.HSQLDialect
- Informix -
org.hibernate.dialect.InformixDialect
- Ingres -
org.hibernate.dialect.IngresDialect
- Interbase -
org.hibernate.dialect.InterbaseDialect
- Pointbase -
org.hibernate.dialect.PointbaseDialect
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Dec
2007 | Java Jazz Up |30 |
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