Ognjen: Osnove JPA

2009-12-14T12:07:39Z

Osnove JPA

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Implementacije:

* Apache OpenJPA
* Hibernate EntityManager
* Oracle TopLink Essentials

Uputstvo:

http://openjpa.apache.org/builds/1.2.1/apache-openjpa-1.2.1/docs/manual/manual.html

Primer POJO klase sa anotacijama:

<pre>
@Entity
@Table(name="test_table")
public class TestTable implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="id")
private int id;

@Column(name="int_field")
private int integerField;

@Column(name="string_field")
private String stringField;

private static final long serialVersionUID = 1L;

public TestTable() {
}

public int getId() {
return id;
}

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

public int getIntegerField() {
return this.integerField;
}

public void setIntegerField(int integerField) {
this.integerField = integerField;
}

public String getStringField() {
return this.stringField;
}

public void setStringField(String stringField) {
this.stringField = stringField;
}

}
</pre>

Primer persistence.xml fajla:

<pre>
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.0" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<persistence-unit name="eTestPu">
<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>

<class>model.TestTable</class>
<properties>
<property name="openjpa.ConnectionURL" value="jdbc:mysql://server.rcub.bg.ac.rs/baza?useUnicode=true&characterEncoding=utf-8"/>
<property name="openjpa.ConnectionDriverName" value="com.mysql.jdbc.Driver"/>
<property name="openjpa.ConnectionUserName" value="ognjen"/>
<property name="openjpa.ConnectionPassword" value="lozinka"/>

<property name="openjpa.jdbc.DBDictionary" value="SupportsSubselect=true"/>
</properties>

</persistence-unit>
</persistence>
</pre>

Primer orm.xml fajla:

<pre>
<?xml version="1.0" encoding="UTF-8" ?>
<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
version="1.0">

<named-query name="TestTable.findAll">
<query>
select o
from TestTable o
</query>
</named-query>
</entity-mappings>
</pre>

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Ognjen: Osnove JPA