Creating Mappings with Hibernate XML Files - Beginning Hibernate: From Novice to Professional - page 163

public void setId(int id) {
this.id = id;

}

public void setUsername(String username) {
this.username = username;

}

// We will map the id to the table's primary key
private int id = -1;

// We will map the username into a column in the table
private String username;

}

It's pretty easy to see that we might want to represent the class in Listing 7-3 in a table
with the format shown in Table 7-16.

Table 7-16. Mapping a Simple Class to a Simple Table

Column Type

Id Integer

Username Varchar(32)

The mapping between the two is, thus, similarly straightforward:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
< class name="book.hibernatebook.chapter06.User">

< id name="id" type="int">
< generator class="native"/>
</id>

< property name="username" type="string" length="32"/>

</class>
</hibernate-mapping>

Aside from the very limited number of properties maintained by the class, this is a pretty
common mapping type, so it is reassuring to see that it can be managed with a minimal
number of elements ( <hibernate-mapping> , <class> , <id> , <generator> , and <property> ).