我有以下的實體類(在Groovy):休眠:自動創建/基於實體類更新數據庫表
import javax.persistence.Entity
import javax.persistence.Id
import javax.persistence.GeneratedValue
import javax.persistence.GenerationType
@Entity
public class ServerNode {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
Long id
String firstName
String lastName
}
和我的persistence.xml:
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">
<persistence-unit name="NewPersistenceUnit">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/Icarus"/>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.connection.username" value="root"/>
<property name="hibernate.connection.password" value=""/>
<property name="hibernate.archive.autodetection" value="class"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.format_sql" value="true"/>
<property name="hbm2ddl.auto" value="create"/>
</properties>
<class>net.interaxia.icarus.data.models.ServerNode</class>
</persistence-unit>
</persistence>
和腳本:
import javax.persistence.EntityManager
import javax.persistence.EntityManagerFactory
import javax.persistence.Persistence
import net.interaxia.icarus.data.models.ServerNode
def factory = Persistence.createEntityManagerFactory("NewPersistenceUnit")
def manager = factory.createEntityManager()
manager.getTransaction().begin()
manager.persist new ServerNode(firstName: "Test", lastName: "Server")
manager.getTransaction().commit()
數據庫'Icarus'存在,但目前沒有表。我希望Hibernate根據實體類自動創建和/或更新表。我將如何實現這一目標?
這是hbm2dll.auto開頭缺失的'hibernate'。謝謝! – 2008-11-20 21:36:08
我剛剛刪除了那一行,它不會刪除表格。希望這可以幫助! – Meinkraft 2015-10-13 03:25:10