我有带有 Hibernate 的 Spring MVC 应用程序。早些时候，我有一个类，它与每个实体的 session (数据库)一起使用，一切都运行良好。现在，我有了抽象 Dao 类，每个实体都由一个类继承。当我想在数据库中插入新数据时，一切正常。但是当我想要更新数据时，它们到达 Controller (我可以在控制台中打印它们)，但 Hibernate 不会生成用于更新的 sql 代码。我打开 Hibernate 的属性来显示 sql，我看到 hibernate 生成了除 UPDATE 之外的所有 sql 查询。抽象类中的所有方法都有效，除了更新方法。
一件有趣的事情是我在控制台中没有遇到任何错误。
这是交叉点类
@Entity
@Table(name = "intersections")
public class Intersection implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "id")
private Integer id;
@Column(name = "symbol")
private Integer symbol;
@Size(max = 256)
@Column(name = "title")
private String title;
@OneToMany(mappedBy = "intersection",cascade = CascadeType.ALL)
private List<Access> accessList;
访问类
@Entity
@Table(name = "accesses")
public class Access implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "id")
private Integer id;
@Column(name = "symbol")
private Integer symbol;
@Size(max = 50)
@Column(name = "title")
private String title;
@JoinColumn(name = "intersection", referencedColumnName = "id")
@ManyToOne(cascade = CascadeType.ALL)
private Intersection intersection;
抽象类
public abstract class AbstractDao<T, I, A, P, ID extends Serializable> implements DaoInterface<T, I, A, P, ID>{
@Autowired
private SessionFactory sessionFactory;
private Class<T> classType;
public AbstractDao(){
ParameterizedType type = (ParameterizedType) getClass().getGenericSuperclass();
this.classType = (Class<T>)type.getActualTypeArguments()[0];
}
@Override
public void insert(T t) {
Session session = sessionFactory.getCurrentSession();
session.save(t);
}
@Override
public void update(T t) {
Session session = sessionFactory.getCurrentSession();
session.update(t);
}
@Override
public List<T> getAll() {
Session session = sessionFactory.getCurrentSession();
Criteria c = session.createCriteria(classType);
c.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
c.addOrder(Order.asc("symbol"));
List<T> list = c.list();
return list;
}
@Override
public T getById(ID id) {
Session session = sessionFactory.getCurrentSession();
T a = (T)session.get(classType, id);
return a;
}
@Override
public List<T> getByIntersection(I i) {
Session session = sessionFactory.getCurrentSession();
Criteria c = session.createCriteria(classType);
c.add(Restrictions.eq("intersection", i));
c.addOrder(Order.asc("symbol"));
List<T> list = c.list();
return list;
}
@Override
public List<T> getByAccess(A a) {
Session session = sessionFactory.getCurrentSession();
Criteria c = session.createCriteria(classType);
c.add(Restrictions.eq("access", a));
c.addOrder(Order.asc("symbol"));
List<T> list = c.list();
return list;
}
@Override
public List<T> getByPole(P p) {
Session session = sessionFactory.getCurrentSession();
Criteria c = session.createCriteria(classType);
c.add(Restrictions.eq("pole", p));
c.addOrder(Order.asc("symbol"));
List<T> list = c.list();
return list;
}
AccessDao
@Transactional(propagation = Propagation.REQUIRED, readOnly = false)
public class AccessDao extends AbstractDao<Access, Intersection, Access, Pole, Integer>{
}
Controller 中的方法
@RequestMapping(value = "/access", method = RequestMethod.POST)
public String accessUpdate(
@RequestParam Integer idInt,
@RequestParam Integer idAccess,
@RequestParam String symbol,
@RequestParam String title,
ModelMap model){
String naslov = "Ažuriranje prilaza";
model.addAttribute("naslov", naslov);
List<Intersection> intersections = intersectionDao.getAll();
model.addAttribute("intersections", intersections);
Intersection i = intersectionDao.getById(idInt);
Access a = (Access) accessDao.getById(idAccess);
a.setIntersection(i);
a.setSymbol(Integer.parseInt(symbol));
a.setTitle(title);
accessDao.update(a);
return "accessupdate";
}
编辑:web.xml， Spring 配置
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<!-- Context -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/spring/applicationContext.xml,
/WEB-INF/spring/database.xml,
/WEB-INF/spring/spring-security.xml
</param-value>
</context-param>
<!-- Listeners -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- Dispatcher Servlet -->
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/dispatcher-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
<multipart-config>
<max-file-size>10485760</max-file-size>
<max-request-size>20971520</max-request-size>
<file-size-threshold>5242880</file-size-threshold>
</multipart-config>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- Filters -->
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>MultipartFilter</filter-name>
<filter-class>org.springframework.web.multipart.support.MultipartFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>MultipartFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>hibernateFilter</filter-name>
<filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>
<init-param>
<param-name>sessionFactoryBeanName</param-name>
<param-value>sessionFactory</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>hibernateFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
</web-app>
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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/p http://www.springframework.org/schema/p/spring-p-4.0.xsd" >
<context:component-scan base-package="com.intersections.controller" />
<context:component-scan base-package="com.intersections.model" />
<context:component-scan base-package="com.intersections.dao" />
<mvc:annotation-driven />
<mvc:resources mapping="/assets/**" location="/assets/" />
<mvc:resources mapping="/pdf/**" location="/pdf/" />
</beans>
数据库.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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
p:location="/WEB-INF/jdbc.properties" />
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource"
p:driverClassName="${jdbc.driverClassName}"
p:url="${jdbc.url}"
p:username="${jdbc.username}"
p:password="${jdbc.password}" />
<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>
<value>com.intersections.model.Intersection</value>
<value>com.intersections.model.Access</value>
<value>com.intersections.model.Pole</value>
<value>com.intersections.model.TrafficSignalController</value>
<value>com.intersections.model.Detector</value>
<value>com.intersections.model.SignalHead</value>
<value>com.intersections.model.PedestrianPushButton</value>
<value>com.intersections.model.PedestrianDisplay</value>
<value>com.intersections.model.User</value>
<value>com.intersections.model.Rank</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</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" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="get*" read-only="true" />
<tx:method name="find*" read-only="true" />
<tx:method name="*" />
</tx:attributes>
</tx:advice>
<bean id="accessDao" class="com.intersections.dao.AccessDao" />
<bean id="detectorDao" class="com.intersections.dao.DetectorDao"/>
<bean id="intersectionDao" class="com.intersections.dao.IntersectionDao" />
<bean id="pedestrianDisplayDao" class="com.intersections.dao.PedestrianDisplayDao"/>
<bean id="pedestrianPushButtonDao" class="com.intersections.dao.PedestrianPushButtonDao"/>
<bean id="poleDao" class="com.intersections.dao.PoleDao"/>
<bean id="signalHeadDao" class="com.intersections.dao.SignalHeadDao"/>
<bean id="trafficSignalControllerDao" class="com.intersections.dao.TrafficSignalControllerDao"/>
<bean id="userDao" class="com.intersections.dao.UserDao" />
<bean id="exportExcel" class="com.intersections.service.ExportExcel" />
</beans>
spring-security.xml
<?xml version='1.0' encoding='UTF-8' ?>
<beans:beans xmlns="http://www.springframework.org/schema/security"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security.xsd" >
<http pattern="/assets/**" security="none" />
<http auto-config="true">
<access-denied-handler error-page="/403"/>
<intercept-url pattern="/login" access="permitAll()"/>
<intercept-url pattern="/" access="permitAll()"/>
<intercept-url pattern="/pdf/**" access="hasRole('USER')"/>
<intercept-url pattern="/use/**" access="hasRole('USER')"/>
<intercept-url pattern="/insert/**" access="hasRole('FULLUSER')"/>
<intercept-url pattern="/update/**" access="hasRole('FULLUSER')"/>
<form-login login-page="/login"
default-target-url="/" />
<logout />
</http>
<authentication-manager>
<authentication-provider user-service-ref="userDao" />
</authentication-manager>
</beans:beans>
最佳答案
您需要在更新方法中添加以下内容
session.flush();
关于java - Hibernate 不生成更新的 sql 代码，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41273399/