hibernate错误1.0

原创于 2019-08-09 08:36:25 发布 · 568 阅读

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本文主要汇总了Hibernate使用过程中遇到的问题，包括版本兼容性、映射文件与数据库匹配、配置文件加载及数据表创建等问题，并提供了详细的解决方案。

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问题收集

8月 09, 2019 8:18:02 上午 org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.2.17.Final}
8月 09, 2019 8:18:02 上午 org.hibernate.cfg.Environment <clinit>
INFO: HHH000205: Loaded properties from resource hibernate.properties: {hibernate.format_sql=true, hibernate.dialect=org.hibernate.dialect.H2Dialect, hibernate.connection.username=sa, hibernate.connection.url=jdbc:h2:mem:db1;DB_CLOSE_DELAY=-1;LOCK_TIMEOUT=10000, hibernate.max_fetch_depth=5, hibernate.generate_statistics=true, hibernate.connection.driver_class=org.h2.Driver, hibernate.connection.password=****, hibernate.bytecode.use_reflection_optimizer=false, hibernate.connection.pool_size=5, hibernate.service.allow_crawling=false}

此问题已解决：该版本的hibernate适用于jdk7和jdk8
详情请转

八月 09, 2019 11:54:07 上午 org.hibernate.internal.SessionFactoryRegistry addSessionFactory
WARN: HHH000277: Could not bind factory to JNDI
org.hibernate.engine.jndi.JndiException: Error parsing JNDI name []

 <session-factory name="">改为 <session-factory>

详情请转
3、

org.hibernate.MappingException: Unknown entity: pojo.UserBean
	at org.hibernate.metamodel.internal.MetamodelImpl.entityPersister(MetamodelImpl.java:625)

原因：1、映射文件的表名与列名，要与数据库中匹配
2、映射文件要被配置文件所加载
3、读取配置的类要确保数据准确提取配置文件

4、

the Connection 'local transaction' will be committed and the Connection will be set into auto-commit mode.

<!-- 指定自动生成数据表的策略:在运行数据库的时候hibernate会为我们在数据库自动生成数据表的策略 -->
		<!-- <property name="hibernate.hbm2ddl.auto">update</property> -->

原因：这个属性的配置将会产生一个数据表，而已经在数据库创建了数据表，就不用再创建数据表，所以，在有数据标的情况下配置此属性，将会导致事务提交失败，故，去掉该属性，问题解决

配置文件读取：

package loadhibernate;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

public class Loadconfig {
//	创建会话工厂
	private static SessionFactory sessionFactory;
//创建局部变量保存session
	private static final ThreadLocal<Session> THREAD_LOCAL = new ThreadLocal<Session>();
//读取配置文件
	static {
		try {
//		注册配置文件
			ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().configure("/hibernate.cfg.xml")
					.build();
//		创建会话工厂
			sessionFactory = new MetadataSources(serviceRegistry).buildMetadata().buildSessionFactory();
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}
	}

//重建sessionFactory
	public static void rebuildSessionFactory() {
		Configuration configuration = new Configuration();
		configuration.configure("/hibernate.cfg.xml");
		StandardServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
				.applySettings(configuration.getProperties()).build();
		sessionFactory = configuration.buildSessionFactory();
	}

//创建sessionfactory实例
	public static SessionFactory getSessionFactory() {
		return sessionFactory;
	}

//访问线程中session
	public static Session getSession() throws HibernateException {
		Session session = (Session) THREAD_LOCAL.get();
		if (session == null || !session.isOpen()) {
			if (sessionFactory == null) {
				rebuildSessionFactory();
			}
//			创建session
			session = (sessionFactory != null) ? sessionFactory.openSession() : null;
			THREAD_LOCAL.set(session);
		}
		return session;
	}

//关闭session
	public static void closeSession() {
//		获取session——保证session不为空，以便关闭session
		Session session = (Session) THREAD_LOCAL.get();
//		将session设置为空
		THREAD_LOCAL.set(null);
//		关闭session
		if (session != null) {
			session.close();
		}
	}
//	关闭缓存和连接池
	public static void shutdown() {
		getSessionFactory().close();
	}
}

配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
                                         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
 <session-factory name="">
  <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
  <property name="hibernate.connection.password">root1</property>
  <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/mysql?serverTimezone=Asia/Shanghai&amp;useSSL=false</property>
  <property name="hibernate.connection.username">root</property>
  <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
  <property name="hibernate.hbm2ddl.auto">update</property>
  <property name="show_sql">true</property>
  <property name="connection.pool_size">1</property>
  <mapping class="pojo.User" resource="pojo/UserBean.hbm.xml"/>
 </session-factory>
</hibernate-configuration>