在 Hibernate 5 中未使用 hbm2ddl.auto=update 创建表

Question

数据库表不是由hibernate-cfg.xml 中的<property name="hbm2ddl.auto">update</property> 设置自动创建的，具有以下组合：

Java 8 + Tomcat 8 + MySQL + Hibernate 5

1. Java 版本：

   java version "1.8.0_45"
   Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
   Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)
   

2. MySQL 版本：

   mysql  Ver 14.14 Distrib 5.6.16, for osx10.7 (x86_64) using  EditLine wrapper
   

3. Tomcat 版本：

   apache-tomcat-8.0.22
   

4. pom.xml sn-ps:

   <dependency>
     <groupId>org.eclipse.persistence</groupId>
     <artifactId>javax.persistence</artifactId>
     <version>2.1.0</version>
   </dependency>
   <dependency>
     <groupId>javax.transaction</groupId>
     <artifactId>jta</artifactId>
     <version>1.1</version>
   </dependency>
   <dependency>
     <groupId>org.hibernate.javax.persistence</groupId>
     <artifactId>hibernate-jpa-2.1-api</artifactId>
     <version>1.0.0.Final</version>
   </dependency>
   <dependency>
     <groupId>org.hibernate</groupId>
     <artifactId>hibernate-core</artifactId>
     <version>5.0.3.Final</version>
   </dependency>
   <dependency>
     <groupId>org.hibernate</groupId>
     <artifactId>hibernate-entitymanager</artifactId>
     <version>5.0.3.Final</version>
   </dependency>
   <dependency>
     <groupId>org.hibernate</groupId>
     <artifactId>hibernate-c3p0</artifactId>
     <version>5.0.3.Final</version>
   </dependency>
   

5. 实体类：

   package com.test.entity;
   
   import java.util.Date;
   
   import javax.persistence.Column;
   import javax.persistence.Entity;
   import javax.persistence.GeneratedValue;
   import javax.persistence.Id;
   import javax.persistence.Table;
   import javax.persistence.Temporal;
   import javax.persistence.TemporalType;
   
   import org.hibernate.annotations.GenericGenerator;
   
   @Entity
   @Table( name = "EVENTS" )
   public class Event {
       @Id
       @GeneratedValue(generator="increment")
       @GenericGenerator(name="increment", strategy = "increment")
       private Long id;
   
       private String title;
   
       @Temporal(TemporalType.TIMESTAMP)
       @Column(name = "EVENT_DATE")
       private Date date;
   
       public Event() {}
   
       public Long getId() { return id; }
       private void setId(Long id) { this.id = id; }
       public Date getDate() { return date; }
       public void setDate(Date date) { this.date = date; }
       public String getTitle() { return title; }
       public void setTitle(String title) { this.title = title; }
   }
   

6. 休眠SessionFactory初始化：

   String resource = "hibernate.cfg.xml";
   Configuration configuration = new Configuration();
   configuration.configure(resource);
   ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
   SessionFactory sessionFactoryCore = configuration.buildSessionFactory(serviceRegistry);
   

7. hibernate.cfg.xml：

   <?xml version="1.0" encoding="UTF-8"?>
   <!DOCTYPE hibernate-configuration PUBLIC 
           "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
           "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 
   <hibernate-configuration>
     <session-factory>
       <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
       <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
       <property name="connection.url">jdbc:mysql://localhost:3306/test</property>
       <property name="connection.username">mysqluser</property>
       <property name="connection.password">******</property>
       <property name="hbm2ddl.auto">update</property>
       <property name="hibernate.max_fetch_depth">3</property>
       <mapping class="com.test.entity.Event" />
     </session-factory>
   </hibernate-configuration>
   

但是，该表是在 MySQL 数据库中创建的，具有以下组合：

Java 8 + Tomcat 8 + MySQL + Hibernate 4

一切都和上面一样，除了在 pom.xml 中，我使用的是 hibernate 4 而不是 5：

<dependency>
  <groupId>org.eclipse.persistence</groupId>
  <artifactId>javax.persistence</artifactId>
  <version>2.1.0</version>
</dependency>
<dependency>
  <groupId>javax.transaction</groupId>
  <artifactId>jta</artifactId>
  <version>1.1</version>
</dependency>
<dependency>
  <groupId>org.hibernate.javax.persistence</groupId>
  <artifactId>hibernate-jpa-2.1-api</artifactId>
  <version>1.0.0.Final</version>
</dependency>
<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-core</artifactId>
  <version>4.3.11.Final</version>
</dependency>
<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-entitymanager</artifactId>
  <version>4.3.11.Final</version>
</dependency>
<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-c3p0</artifactId>
  <version>4.3.11.Final</version>
</dependency>

我在 Hibernate 5 中缺少什么？

Answer 1

我们在升级到 Hibernate 5.x 后遇到了类似的问题，通过将 dialect 更改为 org.hibernate.dialect.MySQL5Dialect 解决了这个问题。

Answer 2

在您的休眠配置文件中添加<property name="javax.persistence.schema-generation.database.action">create</property>。

Answer 3

在 sessionFactoryInitialisation 中尝试类似的操作：

StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder().configure(configFile).build();       
Metadata metadata =new MetadataSources(standardRegistry).getMetadataBuilder().build();  
sessionFactory = metadata.getSessionFactoryBuilder().build();
return sessionFactory;