JPA的配置文件persistence.xml参数详解
- JPA规范要求在类路径的META-INF目录下放置persistence.xml, 文件的名称是固定的,配置模板如下:
-
- Xml代码
-
<?xml version="1.0" encoding="UTF-8"?>
-
<persistence version="2.1"
- xmlns="<a target=_blank href="http://xmlns.jcp.org/xml/ns/persistence">http://xmlns.jcp.org/xml/ns/persistence</a>" xmlns:xsi="<a target=_blank href="http://www.w3.org/2001/XMLSchema-instance">http://www.w3.org/2001/XMLSchema-instance</a>"
- xsi:schemaLocation="<a target=_blank href="http://xmlns.jcp.org/xml/ns/persistence">http://xmlns.jcp.org/xml/ns/persistence</a>
- <a target=_blank href="http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd</a>">
-
-
<persistence-unit name="persist-unit"
- transaction-type="RESOURCE_LOCAL">
- <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
-
- <class>boa.framework.entity.CustomerEntity</class> <shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
- <validation-mode>CALLBACK</validation-mode>
- <properties>
-
- <property name="javax.persistence.jdbc.url" value="jdbc:derby:memory:exampleDB;create=true" />
- <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver" />
- <property name="javax.persistence.jdbc.user" value="" />
- <property name="javax.persistence.jdbc.password" value="" />
- <property name="javax.persistence.schema-generation.database.action"
- value="drop-and-create" />
- <property name="javax.persistence.schema-generation.create-source"
- value="script" />
- <property name="javax.persistence.schema-generation.create-script-source"
- value="META-INF/create-script.sql" />
- <property name="eclipseink.logging.level" value="INFO" />
- </properties>
- </persistence-unit>
-
</persistence>
-
-
-
- <!--
- Name属性用于定义持久化单元的名字 (name必选,空值也合法);
- transaction-type 指定事务类型(可选)
- -->
-
<persistence-unit name="unitName" transaction-type="JTA">
-
-
- <description> </description>
-
-
- <provider> </provider>
-
-
- <jta-data-source>java:/test</jta-data-source>
- <non-jta-data-source> </non-jta-data-source>
-
-
- <mapping-file>product.xml</mapping-file>
-
-
- <jar-file>../lib/model.jar</jar-file>
-
-
- <class>boa.framework.entity.CustomerEntity</class>
-
-
- <exclude-unlisted-classes>true</exclude-unlisted-classes>
- shared-cache-mode
- 缓存模式。加了@Cacheable注解的默认为二级缓存。有四种模式:ALL-缓存所有实体;NONE-禁止缓存;ENABLE_SELECTIVE-如果加了缓存的标识,是默认的选选 项;DISABLE_SELECTIVE- enable caching unless explicitly marked as @Cacheable(false) (not recommended)
- validation-mode
- 实体的验证模式,默认是激活的。当一个实体在创建、更新,在实体发送到数据库前会被进行验证。CALLBACK: entities are validated on creation, update and deletion. If no Bean Validation provider is present, an exception is raised at initialization time.
- <properties>
-
- <property name="eclipseink.logging.level" value="INFO" />
- </properties>
-
-
</persistence-unit>
-
-
</persistence>
原文地址http://www.bieryun.com/1892.html