您可以使用mysql-orm.xml文件覆盖您的公式,然后在数据库为mysql时将您的构建配置为对文件进行考虑.
在这里覆盖公式：
<entity-mappings
xmlns="http://xmlns.jcp.org/xml/ns/persistence/orm"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence/orm orm_2_1.xsd"
version="2.1">
<package>com.acme.persistence</package>
<entity class="AreaAuxiliar" access="FIELD">
<attributes>
<property name="ruta" formula="schemaName.RUTAAREA(idarea)"/>
</attributes>
</entity>
</entity-mappings>
然后在特定的persistence.xml中添加引用.然后,在构建中或运行时使用这个覆盖默认的persistence.xml(参见下面的链接).
<persistence
xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="persistenceUnit">
<provider>
org.hibernate.jpa.HibernatePersistenceProvider
</provider>
<mapping-file>
mappings/identifier/global/mysql-orm.xml
</mapping-file>
<class>
com.acme.persistence.AreaAuxiliar
</class>
</persistence-unit>
注意：重重的灵感来自How to change Hibernate GenerationType identifier depending on the underlying database
注意(2)：在blog post和here中,作者在运行时生成PersistenceUnitInfo.
