SSH整合方式二：将hibernate的配置交给Spring管理

悠悠 2022-12-07 04:25 67阅读 0赞

#### SSH整合方式二：将hibernate的配置交给Spring管理 ####

SSH整合方式二：不带hibernate配置文件

1、hibernate配置文件中有哪些内容：  
数据库连接的基本信息  
Hibernate的相关的属性的配置  
方言  
显示SQL  
格式化SQL  
…  
C3P0连接池  
映射文件

--------------------

2、编写一个数据库基本信息的属性配置文件：jdbc.properties

jdbc.className=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://127.0.0.1:3306/study_test
    jdbc.user=root
    jdbc.password=123456

--------------------

3、其他地方不变，参考SSH整合方式一。

只需把hibernate.cfg.xml文件交给Spring管理

applicationContext.xml文件：

<?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:tx="http://www.springframework.org/schema/tx" 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/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    
    	
    	<context:property-placeholder location="classpath:jdbc.properties" />
    
    	
    	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    		<property name="driverClass" value="${jdbc.className}" />
    		<property name="jdbcUrl" value="${jdbc.url}" />
    		<property name="user" value="${jdbc.user}" />
    		<property name="password" value="${jdbc.password}" />
    	</bean>
    
    	
    	<bean id="customerAction" class="com.pipi.ssh.web.action.CustomerAction" scope="prototype">
    		<property name="customerService" ref="customerService"/>
    	</bean>
    
    	
    	<bean id="customerService" class="com.pipi.ssh.service.CustomerServiceImpl">
    		<property name="customerDao" ref="customerDao"/>
    	</bean>
    
    	
    	<bean id="customerDao" class="com.pipi.ssh.dao.CustomerDaoImpl">
    		<property name="sessionFactory" ref="sessionFactoryBean"/>
    	</bean>
    
    	
    	
    	<bean id="sessionFactoryBean" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
    		
    		<property name="dataSource" ref="dataSource" />
    
    		
    		<property name="hibernateProperties">
    			<props>
    				<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
    				<prop key="hibernate.show_sql">true</prop>
    				<prop key="hibernate.format_sql">true</prop>
    				<prop key="hibernate.hbm2ddl.auto">update</prop>
    			</props>
    		</property>
    
    		
    		<property name="mappingResources">
    			<list>
    				<value>com/pipi/ssh/domain/Customer.hbm.xml</value>
    			</list>
    		</property>
    	</bean>
    
    
    	
    	<bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
    		<property name="sessionFactory" ref="sessionFactoryBean"/>
    	</bean>
    
    	
    	<tx:annotation-driven transaction-manager="transactionManager"/>
    
    </beans>

--------------------

##### 4、Hibernate模板的常用的方法 #####

（1）保存操作  
save(Object obj);

public void save(Customer customer) { 
        this.getHibernateTemplate().save(customer);
    }

（2）修改操作  
update(Object obj);

public void update(Customer customer) { 
        this.getHibernateTemplate().update(customer);
    }

（3）删除操作  
delete(Object obj);

public void delete(Customer customer) { 
        this.getHibernateTemplate().delete(customer);
    }

（4）查询操作  
查询一个：  
get(Class c,Serializable id);  
load(Class c,Serializable id);

public Customer findById(Long id) { 
        //return this.getHibernateTemplate().get(Customer.class, id);
        return this.getHibernateTemplate().load(Customer.class, id);
    }

查询多个：  
List find(String hql,Object… args);  
List findByCriteria(DetachedCriteria dc);  
List findByCriteria(DetachedCriteria dc,int firstResult,int maxResults);  
List findByNamedQuery(String name,Object… args);

public List<Customer> findAllByHQL() { 
        List<Customer> list = (List<Customer>) this.getHibernateTemplate().find("from Customer");
        return list;
    }

public List<Customer> findAllByQBC() { 
        DetachedCriteria criteria = DetachedCriteria.forClass(Customer.class);
        List<Customer> list = (List<Customer>) this.getHibernateTemplate().findByCriteria(criteria);
        return list;
    }

public List<Customer> findAllByNamedQuery() { 
        return (List<Customer>) this.getHibernateTemplate().findByNamedQuery("queryAll");
    }

--------------------

##### 5、Spring提供了延迟加载的解决方案 #####

在SSH整合开发中哪些地方会出现延迟加载：  
使用load方法查询某一个对象的时候（不常用）  
查询到某个对象以后，显示其关联对象。

只需在web.xml中配置一个过滤器即可，在核心过滤器之前配置：

web.xml中配置：

<?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_4_0.xsd" version="4.0">
        
        
        <listener>
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>
    
        
        <context-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </context-param>
    
        
        <filter>
            <filter-name>OpenSessionInViewFilter</filter-name>
            <filter-class>org.springframework.orm.hibernate5.support.OpenSessionInViewFilter</filter-class>
        </filter>
        <filter-mapping>
            <filter-name>OpenSessionInViewFilter</filter-name>
            <url-pattern>*.action</url-pattern>
        </filter-mapping>
    
        
        <filter>
            <filter-name>struts2</filter-name>
            <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
        </filter>
        <filter-mapping>
            <filter-name>struts2</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>
    
    </web-app>

--------------------