Simple hbm.xml file example

In hibernate environment there would be one class_name.hbm.xml file for each entity/object. This file will be used to map an object with the corresponding table in database.
For example - Person.hbm.xml would be used to map the table 'PERSON' in database which stores the Person objects.

Below is a simple example to write hbm.xml file

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="path.to.the.class.package.Person" table="PERSON">
<id name="lastName" type="string" unsaved-value="null" >
<column name="L_NAME" not-null="true"/>
<generator class="uuid.hex"/>
</id>

<property name="firstName" column="F_NAME" type="string"/>
<property name="age" column="AGE" type="integer"/>
<property name="city" column="CITY" type="string"/>
<property name="pinCode" column="PIN" type="integer"/>

</class>
</hibernate-mapping>

To make hibernate to use this file or to load this file in environment you need to specify the property for this in hibernate.cfg.xml as below

<mapping resource="path/to/the/hbmXml/file/Person.hbm.xml">

In next section we will see what is the next thing to learn to start the Hibernate development.

Simple hibernate.cfg.xml file example

Here I'm giving an example to right a simple hibernate.cfg.xml file.



<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
<!-- jdbc connection properties -->
<property name="hibernate.connection.datasource">myDataSourceName</property>
<property name="connection.driver_class">properDriverForDatabase</property>
<property name="connection.url">databaseURL</property>
<!-- for example : jdbc:oracle:thin:@myHost:port:orcl-->
<property name="connection.username">user</property>
<property name="connection.password">password</property>
<property name="show_sql">true</property>
<property name="dialect">net.sf.hibernate.dialect.OracleDialect</property>
<property name="transaction.factory_class">net.sf.hibernate.transaction.JDBCTransactionFactory</property>

<mapping resource="path/to/the/hbmXml/file/fileName.hbm.xml">

</session-factory>
</hibernate-configuration>

We will see in coming posts about the mandatory properties and optional properties and what they stands for.