示例
休眠（和嵌入式H2DB）
<?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"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="persistenceUnit">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>my.application.entities.MyEntity</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.h2.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:h2:data/myDB.db" />
<property name="javax.persistence.jdbc.user" value="sa" />
<!-- DDL change options -->
<property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>
<property name="hibernate.flushMode" value="FLUSH_AUTO" />
</properties>
</persistence-unit>
</persistence>Eclipselink（和嵌入式H2DB）
<?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"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="persistenceUnit">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>my.application.entities.MyEntity</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:h2:data/myDB.db"/>
<property name="javax.persistence.jdbc.user" value="sa"/>
<!-- Schema generation : drop and create tables -->
<property name="javax.persistence.schema-generation.database.action" value="drop-and-create-tables" />
</properties>
</persistence-unit>
</persistence>DataNucleus（和嵌入式H2DB）
<?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"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="persistenceUnit">
<provider>org.datanucleus.api.jpa.PersistenceProviderImpl</provider>
<class>my.application.entities.MyEntity</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:h2:data/myDB.db"/>
<property name="javax.persistence.jdbc.user" value="sa"/>
<!-- Schema generation : drop and create tables -->
<property name="javax.persistence.schema-generation.database.action" value="drop-and-create-tables" />
</properties>
</persistence-unit>
</persistence>
