JPA的配置文件persistence.xml参数详解

2018-03-04 5470

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简介：

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>

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JPA的配置文件persistence.xml参数详解

JPA的配置文件persistence.xml参数详解

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