Hibernate XML Mapping

Hibernate XML Mapping

Hibernate XML Mapping

Hibernate XML Mapping

In this section, you will learn how to do XML mapping in Hibernate.

In Hibernate, XML file is used for two things : First, for configuring the database(hibernate.cfg.xml), Second, for mapping database table to POJO class. 

The sample XML file used for configuring the database is given below :

hibernate.cfg.xml

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

<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://192.168.10.13:3306/anky</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property>

<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">validate</property>

<mapping class="net.roseindia.WorkerDetail"/>
<mapping class="net.roseindia.Worker"/>

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

XML Mapping

The sample XML mapping file used for mapping Java class to database table is given below :

person.hbm.xml

<?xml version='1.0'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="roseindia">
<class name="Person" table="person">
<id name="id" type="int" column="Id" >
<generator class="assigned"/>
</id>

<property name="name">
<column name="Name" />
</property>

</class>
</hibernate-mapping>

XML one to one mapping

The XML mapping file used in one-to-one mapping is given below :

Worker.hbm.xml

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

<hibernate-mapping package="net.roseindia">

<class name="Worker" table="worker">
<id name="workerId" column="worker_id">
<generator class="native" />
</id>
<one-to-one name="workerDetail" class="net.roseindia.WorkerDetail"
cascade="save-update"></one-to-one>

<property name="firstname" column="firstname" />
<property name="lastname" column="lastname" />
<property name="birthDate" type="date" column="birth_date" />
<property name="cellphone" column="cell_phone" />

</class>
</hibernate-mapping>

WorkerDetail.hbm.xml

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

<hibernate-mapping package="net.roseindia">

<class name="WorkerDetail" table="workerdetail">

<id name="workerId" type="java.lang.Long">
<column name="worker_id" />
<generator class="foreign">
<param name="property">worker</param>
</generator>
</id>
<one-to-one name="worker" class="net.roseindia.Worker"
constrained="true"></one-to-one>

<property name="street" column="street" />
<property name="city" column="city" />
<property name="state" column="state" />
<property name="country" column="country" />
</class>

</hibernate-mapping>

XML One to Many Mapping

The one to many relation between two tables is shown below :

The XML one-to-many mapping is given below:

Address.hbm.xml

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

<hibernate-mapping package="net.roseindia">
<class name="Address" table="address">
<id name="addressId" column="address_id">
<generator class="native" />
</id>
<property name="street" column="street"/>
<property name="city" column="city"/>
<property name="state" column="state"/>
<property name="country" column="country"/>
<set name="employees" table="employee"
inverse="true" lazy="true" fetch="select">
<key>
<column name="address_id" not-null="true" />
</key>
<one-to-many class="net.roseindia.Employee" />
</set>
</class>
</hibernate-mapping>

Employee.hbm.xml

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

<hibernate-mapping package="net.roseindia">

<class name="Employee" table="employee">
<id name="employeeId" column="employee_id">
<generator class="native" />
</id>

<property name="firstname" column="firstname"/>
<property name="lastname" column="lastname" />
<property name="cellphone" column="cell_phone" />

<many-to-one name="address" class="net.roseindia.Address" fetch="select">
<column name="address_id" not-null="true" />
</many-to-one>

</class>
</hibernate-mapping>

XML Many to Many Mapping

The XML Many to Many relation shown below using figure:

The XML many-to-many mapping is given below :

Student.hbm.xml

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

<hibernate-mapping package="net.roseindia">
<class name="Student" table="student">
<id name="studentId" column="student_id">
<generator class="native" />
</id>

<property name="studentName" column="student_name"/>

<set name="courses" table="student_course"
inverse="false" lazy="true" fetch="select" cascade="all">
<key column="student_id" />
<many-to-many column="course_id" class="Course" />
</set>
</class>
</hibernate-mapping>

Course.hbm.xml

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

<hibernate-mapping package="net.roseindia">
<class name="Course" table="course">
<id name="courseId" column="course_id">
<generator class="native" />
</id>

<property name="courseName" column="course_name"/>

<set name="students" table="student_course"
inverse="false" lazy="true" fetch="select" cascade="all">
<key column="student_id" />
<many-to-many column="course_id" class="Course" />
</set>
</class>
</hibernate-mapping>

Tutorials

  1. Introduction To Hibernate 4.0
  2. Complete Hibernate 4.0 Tutorial
  3. Hibernate 4 Tutorial
  4. What's New In Hibernate 4.0 release
  5. Hibernate Architecture
  6. Download Hibernate 4
  7. Hibernate create POJO classes
  8. Hibernate Configuration File
  9. First Hibernate Application
  10. First Hibernate 4 Example with Eclipse
  11. Hibernate 4 Supported Databases List
  12. Hibernate generator Element
  13. Hibernate 4 Annotations
  14. Hibernate 4 Annotation Example
  15. Hibernate 4 One to One Mapping using Annotation
  16. Hibernate 4 One to Many mapping using Annotation
  17. Hibernate One to One Mapping using XML
  18. Hibernate 4 One to Many mapping using XML
  19. Hibernate 4 Many to Many Mapping using Annotation
  20. Hibernate 4 Many to Many Mapping using Xml
  21. Hibernate update Method
  22. Hibernate persist Method
  23. Hibernate saveOrUpdate Method
  24. Hibernate SELECT Clause
  25. Hibernate FROM Clause
  26. Hibernate One to Many Bi-directional Mapping
  27. Hibernate WHERE Clause
  28. Hibernate ORDER BY Clause
  29. Introduction To Hibernate Query Language (HQL)
  30. Hibernate One to One Bi-directional Mapping
  31. Hibernate One to Many Indexed Mapping
  32. Hibernate One to many XML Mapping bag example
  33. Hibernate One to Many XML Mapping list Example
  34. Hibernate One to many XML mapping array Example
  35. Hibernate One to Many Self Join using Annotations
  36. Hibernate GROUP BY Clause
  37. Hibernate Many to Many Self Join using Annotations
  38. Hibernate update Query
  39. Hibernate delete Query
  40. Hibernate insert Query