我遍历了整个stackoverflow，似乎找不到关于使用HibernateTemplate将创建的对象保存到数据库表（MySQL）的查询的答案。我正在使用Hibernate 5和Spring 5.0.7的最新版本。我对Spring-Hibernate还是很陌生，这里是我到目前为止编写的代码：
applicationContext.xml：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<bean id = "dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.cj.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/edureka?useLegacyDatetimeCode=false&serverTimezone=Europe/Amsterdam&useSSL=false" />
<property name="username" value="admin" />
<property name="password" value="password" />
</bean>
<bean id= "mySessionFactory" class = "org.springframework.orm.hibernate5.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="mappingResources">
<list>
<value>mobilephone.hbm.xml</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>
<bean id = "dao" class = "co.module12.MobilePhoneDAO">
<property name="sessionFactory" ref = "mySessionFactory"/>
</bean>
</beans>
休眠映射文件（mobilephone.hbm.xml）：
<!DOCTYPE hibernate-mapping PUBLIC
" - //Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping">
<hibernate-mapping>
<class name = "co.module12.MobilePhone" table="mobiles">
<id name="id">
<generator class="increment"></generator>
</id>
<property name="manfacturer" />
<property name="name" />
<property name="price" />
<property name="colour" />
</class>
</hibernate-mapping>
POJO类（Java Bean）MobilePhone.java：
package co.module12;
/**
*
* @author NetBeans
*/
public class MobilePhone {
private String manfacturer;
private String colour;
private Double price;
private String name;
private Integer id;
public MobilePhone() {
}
public String getManfacturer() {
return manfacturer;
}
public void setManfacturer(String manfacturer) {
this.manfacturer = manfacturer;
}
public String getColour() {
return colour;
}
public void setColour(String colour) {
this.colour = colour;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
}
MobilePhoneDAO.java：
package co.Module12;
import org.hibernate.SessionFactory;
import org.springframework.orm.hibernate5.HibernateTemplate;
import org.springframework.transaction.annotation.Transactional;
/**
*
* @author NetBeans
*/
public class MobilePhoneDAO {
HibernateTemplate template;
SessionFactory factory;
public void setSessionFactory(SessionFactory factory) {
template = new HibernateTemplate(factory);
}
public void saveMobile(MobilePhone phone) {
template.setCheckWriteOperations(false);
template.save(phone);
System.out.println(phone.getId());
System.out.println(phone.getManfacturer());
System.out.println(phone.getName());
}
public void updateMobile(MobilePhone phone) {
template.update(phone);
}
public void deleteMobile(MobilePhone phone) {
template.delete(phone);
}
}
主文件：
package co.Module12;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
*
* @author NetBeans
*/
public class Module12MainClass {
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
MobilePhoneDAO dao = (MobilePhoneDAO)context.getBean("dao");
/*Create Mobile Phone One to Map to mySQL database*/
MobilePhone samsungOne = new MobilePhone();
samsungOne.setColour("black");
samsungOne.setManfacturer("Samsung");
samsungOne.setName("Galaxy S9+");
samsungOne.setPrice(55158.25);
samsungOne.setId(1001);
dao.saveMobile(samsungOne);
/*Create Mobile Phone Two to Map to mySQL database*/
MobilePhone lgPhone = new MobilePhone();
lgPhone.setColour("gray");
lgPhone.setManfacturer("LG");
lgPhone.setName("G7");
lgPhone.setPrice(58782.25);
lgPhone.setId(1002);
dao.saveMobile(lgPhone);
}
}
答案 0 :(得分：0)
尝试在您的DAO方法中添加Spring“ @Transactional”（https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/transaction/annotation/Transactional.html）批注。
可能发生的事情（尽管由于我的数据库当前没有合适的jar，目前无法测试），尽管您的代码确实执行了“保存”方法（您可能会确定是否没有错误，可以在您的DAO中放入调试器），默认情况下，Hibernate可能会设置为执行“自动刷新”功能。这意味着Hibernate决定何时将记录刷新到数据库，但是由于没有事务，因此Hibernate不会费心调用此方法。放置“ @Transactional”批注会将save调用绑定到同时绑定了Hibernate Session的Spring事务，这意味着当事务关闭时，会通知Session关闭，并且应该刷新。
更新：这是我使用H2数据源运行示例股票的错误：
BUG org.springframework.orm.hibernate5.HibernateTemplate - Could not retrieve pre-bound Hibernate session
org.hibernate.HibernateException: Could not obtain transaction-synchronized Session for current thread
at org.springframework.orm.hibernate5.SpringSessionContext.currentSession(SpringSessionContext.java:133)
at org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:699)
at org.springframework.orm.hibernate5.HibernateTemplate.doExecute(HibernateTemplate.java:344)
at org.springframework.orm.hibernate5.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:326)
at org.springframework.orm.hibernate5.HibernateTemplate.save(HibernateTemplate.java:640)
at co.module12.MobilePhoneDAO.saveMobile(MobilePhoneDAO.java:23)
at co.module12.Module12MainClass.main(Module12MainClass.java:23)
但是，您需要对您的Spring上下文文件进行更新，以使事务完全起作用。
<tx:annotation-driven transaction-manager="txManager"/><!-- a PlatformTransactionManager is still required -->
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- (this dependency is defined somewhere else) -->
<property name="dataSource" ref="dataSource"/>
</bean>
我得到了可以在H2数据源上运行的代码，MySQL不应有太大区别。但是，请注意三点：