我编写了一个示例 Spring Hibernate 应用程序，以了解 Spring hibernate 集成的工作原理。
这是我的 applicationContext.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd">
<context:component-scan base-package="com.general" />
<tx:annotation-driven />
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
<property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl" />
<property name="username" value="system" />
<property name="password" value="admin_123" />
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean ">
<property name="dataSource" ref="dataSource"></property>
<property name="packagesToScan" value="com.general"></property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
</beans>
然后，我的服务班是这样的
package com.general;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.transaction.support.TransactionSynchronizationManager;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
@Service("employeeService")
public class EmployeeServiceImpl implements EmployeeService{
@Autowired
private SessionFactory sessionFactory;
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
@Transactional
public void saveEmployee(Employee emp) {
Session session = sessionFactory.getCurrentSession();//.openSession();
session.save(emp);
}
}
我的主要课程是
public class App {
public static void main(String[] args) {
System.out.println("load context");
ConfigurableApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Employee em = new Employee();
em.setId(1l);
em.setName("John");
EmployeeService emService = (EmployeeService) context.getBean("employeeService");
emService.saveEmployee(em);
}
}
如果我使用 getCurrentSession 方法运行此应用程序，那么它运行良好，并且员工被保存到数据库中，但如果我使用 openSession 方法，则不会触发 SQL 查询，因此不会将任何内容保存到数据库中。
我不确定为什么会这样。可能是我对getCurrentSession()和openSession()没有正确的理解。可以请有人让我知道它背后的原因。