Question

我有一个Spring Boot项目。我将资源文件夹放在hibernate.cfg.xml文件中。这是我的hibernate.cfg.xml文件：

<?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="hibernate.bytecode.use_reflection_optimizer">false</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.password">***</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/exportbatch?serverTimezone=UTC</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="show_sql">true</property>
</session-factory>

我有一个hibernateUtil类，用于实例化一个休眠会话。

public class HibernateUtil
{
private static final SessionFactory sessionFactory = buildSessionFactory();

private static SessionFactory buildSessionFactory()
{
    try
    {
        // Create the SessionFactory from hibernate.cfg.xml
        // return new Configuration().configure().buildSessionFactory();
        return new AnnotationConfiguration().configure().buildSessionFactory();
    }
    catch (Throwable ex)
    {
        // Make sure you log the exception, as it might be swallowed
        System.err.println("Initial SessionFactory creation failed." + ex);
        throw new ExceptionInInitializerError(ex);
    }
}

public static SessionFactory getSessionFactory()
{
    return sessionFactory;
}

public static void shutdown()
{
    // Close caches and connection pools
    getSessionFactory().close();
}
}

在我的应用程序控制器中，我有一个要向其请求mysql数据库的端点。

@RequestMapping("/getbuildinginfo/{buildingid}")
public void getbuildinginfo(String buildingid)
            Session session = null;
        session = HibernateUtil.getSessionFactory().openSession();
        session.beginTransaction();

        String query = "select * from exportbatch.exportbatch";
        SQLQuery sqlQuery = session.createSQLQuery(query);

        List<Object[]> rows = sqlQuery.list();
        HibernateUtil.shutdown();

这在我第一次运行项目时很好用，但是如果我第二次调用端点，则会收到此异常： org.hibernate.service.UnknownServiceException：请求了未知服务[org.hibernate.engine.jdbc.connections.spi.ConnectionProvider]

有人可以帮我吗？为什么它第一次起作用？是Spring Boot上下文问题吗？如果是，我该如何解决？

在springboot中使用hibernate和jpa

0 个答案: