Hibernate Class Generation Using hbm2java
Pages: 1, 2, 3, 4, 5, 6
A Simple Class Generation Example
Let's start with a very simple example. Suppose we want to map a
simple table called BOOK, as described here:
Column | Type | Modifiers
------------+-----------------------+-----------
BOOK_ID | character(32) | not null
BOOK_TITLE | character varying(80) | not null
BOOK_ISBN | character varying(20) | not null
To generate this class, we could use the following Hibernate mapping file. Note how meta-attributes can be used to add comments or fine-tune class generation.
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Book" table="BOOK">
<meta attribute="class-description">
A Book business object.
@author Duke
</meta>
<id name="id" type="string" unsaved-value="null" >
<column name="BOOK_ID" sql-type="char(32)" not-null="true"/>
<generator class="uuid.hex"/>
</id>
<property column="BOOK_NAME" name="name"/>
<property column="BOOK_ISBN" name="isbn">
<meta attribute="field-description"/>
The unique ISBN code for this book.
</meta>
</property>
</class>
</hibernate-mapping>
Using this mapping file, the hbm2java will generate
a class that looks something like this:
/**
* A Book business object.
* @author Duke
*/
public class Book {
private String id;
private String name;
private String isbn;
public Book() {
}
public String getId() {
return id;
}
private void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
/**
* The unique ISBN code for this book.
*/
public String getIsbn() {
return isbn;
}
public void setIsbn(String isbn) {
this.isbn = isbn;
}
}
