1、环境准备
spring boot版本:2.3.1.RELEASE
#
网上搜索spring boot 2.x hibernate配置,很多都是jpa例子
从关系上来说应该是spring data jpa-》hibernate-》jpa,jpa是注解规范,jpa是基于hibernate帮我们实现一些通用的操作。
因为需要把旧的项目(spring mvc + spring + hibernat 3.6.5,前后端分离)升级spring boot 2.x,这里只讨论hibernate的配置,毕竟除了hibernate的部分需要升级,其他的部分大部分都可以通用。
2、sessionFactory
hibernate别的不需要多说,只需要设置sessionFactory就可以了。
spring boot可以直接从EntityManagerFactory获取sessionFactory.
下面是修改SimpleHibernateDao的代码,SimpleHibernateDao是旧项目里的封装了常用方法的基类
@Autowired
private EntityManagerFactory entityManagerFactory;
/**
* 取得sessionFactory.
*/
public SessionFactory getSessionFactory() {
return entityManagerFactory.unwrap(SessionFactory.class);
}
/**
* 取得当前Session.
*/
protected Session getSession() {
return getSessionFactory().getCurrentSession();
}
获取session的2种方式:
1、getCurrentSession()会自动关闭session,但是要配置current_session_context_class,并且需要使用事务
2、openSession()这种方式需要手动关闭session
3、步骤三
前面配置完,测试报no transaction is in progress错误
解决方法1:代码配置
spring.jpa.database=MYSQL
spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=none
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.SpringSessionContext
spring.jpa.properties.hibernate.show-sql=true
spring.jpa.properties.hibernate.cache.use_second_level_cache=false
spring.jpa.properties.hibernate.cache.use_query_cache=false
@Configuration
public class HibernateConfig {
@Autowired
private Environment environment;
@Autowired
private DataSource dataSource;
@Bean
public LocalSessionFactoryBean sessionFactoryBean() {
LocalSessionFactoryBean sessionFactoryBean = new LocalSessionFactoryBean();
sessionFactoryBean.setDataSource(dataSource);
sessionFactoryBean.setPackagesToScan("com.qizhan100");//dao和entity的公共包
sessionFactoryBean.setHibernateProperties(hibernateProperties());
return sessionFactoryBean;
}
//获取hibernate配置
private Properties hibernateProperties() {
Properties properties = new Properties();
properties.setProperty("hibernate.current_session_context_class", environment.getProperty("spring.jpa.properties.hibernate.current_session_context_class"));
properties.setProperty("hibernate.hbm2ddl.auto", environment.getProperty("spring.jpa.hibernate.ddl-auto"));
properties.setProperty("hibernate.show-sql", environment.getProperty("spring.jpa.properties.hibernate.show-sql"));
properties.setProperty("hibernate.cache.use_second_level_cache", environment.getProperty("spring.jpa.properties.hibernate.cache.use_second_level_cache"));
properties.setProperty("hibernate.cache.use_query_cache", environment.getProperty("spring.jpa.properties.hibernate.cache.use_query_cache"));
return properties;
}
}
解决方法2:降低hibernate版本
<properties>
<java.version>1.8</java.version>
<hibernate.version>5.0.12.Final</hibernate.version>
</properties>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${hibernate.version}</version>
</dependency>
`
getCurrentSession导致的问题
问题1:org.hibernate.HibernateException: No CurrentSessionContext configured!
application.properties
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.SpringSessionContext
问题2:Could not obtain transaction-synchronized Session for current thread
这个问题就是因为session是用getCurrentSession()获取,但是方法上没有开启事务导致。
consider declaring the factory method as static for independence from its containing instance
待查
参考资料
https://www.jianshu.com/p/57e3c9a40709
https://blog.csdn.net/qq_15329947/article/details/85232287
https://blog.csdn.net/xiaonannew/article/details/82634241
https://blog.csdn.net/wt592376761/article/details/104797009
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