spring 整合 jpa

最新推荐文章于 2024-10-24 15:23:43 发布

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#JPA #Spring #Hibernate #Bean #AOP

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本文介绍了一个使用Spring JPA实现基本增删改查(CRUD)操作的示例应用。该应用包括实体类定义、DAO接口及其实现，并配置了Spring的事务管理。此外还展示了如何通过EntityManager进行数据持久化操作。

导入jpa，spring需要的jar包

domain：

package com.lmning.po;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="people")
public class User implements Serializable{

	private static final long serialVersionUID = -7373249707516981319L;
	@Id
	@GeneratedValue
	private int id;
	@Column(name="name")
	private String name;
	@Column(name="password")
	private String password;
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	public String toString(){
		return id+":"+name+"---"+password;
	}
	

}

dao接口：

public interface UserDao {

	public abstract void save(User user);

	public abstract void update(User user);

	@Transactional(readOnly = true, propagation = Propagation.NOT_SUPPORTED)
	public abstract User getUser(Integer id);

	@SuppressWarnings("unchecked")
	@Transactional(readOnly = true, propagation = Propagation.NOT_SUPPORTED)
	public abstract List<User> getAllUsers();

	public abstract void delete(Integer id);

}

dao实现

package com.lmning.dao.bean;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import com.lmning.po.User;

@Transactional
public class UserDaoBean implements UserDao {
	@PersistenceContext(unitName="people")
	EntityManager em;
	

	public  void save(User user){
		em.persist(user);
	}

	public  void update(User user){
		em.merge(user);
	}

	@Transactional(readOnly=true,propagation=Propagation.NOT_SUPPORTED)
	public  User getUser(Integer id){
		return em.find(User.class, id);
	}

	@SuppressWarnings("unchecked")
	@Transactional(readOnly=true,propagation=Propagation.NOT_SUPPORTED)
	public  List<User> getAllUsers(){
		List<User> users =
		 em.createQuery("select u from User u").getResultList();
		return users;
	}
	
	public  void delete(Integer id){
		 em.remove(em.getReference(User.class, id));
	}

}

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"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
<context:annotation-config/>

<!--	另一种方式
 <context:property-placeholder location="classpath:jdbc.properties"/>
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
	    <property name="driverClassName" value="${driverClassName}"/>
	    <property name="url" value="${url}"/>
	    <property name="username" value="${username}"/>
	    <property name="password" value="${password}"/>
	    <property name="initialSize" value="${initialSize}"/>
	    <property name="maxActive" value="${maxActive}"/>
	    <property name="maxIdle" value="${maxIdle}"/>
	    <property name="minIdle" value="${minIdle}"/>
  	</bean>	

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<property name="dataSource" ref="dataSource" />
		
		<property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml" />
			<property name="loadTimeWeaver">
	          <bean class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver"/>
	       </property>
	</bean>
   -->
   
   <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
 		<property name="persistenceUnitName" value="people"/>
   </bean>  

   
   <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
   <property name="entityManagerFactory">
   <ref local="entityManagerFactory"/>
   </property>
   
   </bean> 

<tx:annotation-driven transaction-manager="transactionManager"/>
	
<bean id="userDao" class="com.lmning.dao.bean.UserDaoBean"></bean>

</beans>

META-INF下persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
    http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
	version="1.0">

	<persistence-unit name="people" transaction-type="RESOURCE_LOCAL">
		<provider>org.hibernate.ejb.HibernatePersistence</provider>
		<!--<jta-data-source>java:/MySqlDS3</jta-data-source>  -->
		<properties>
		     <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
			 
			<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
			<property name="hibernate.connection.username" value="root" />
			<property name="hibernate.connection.password" value="1234" />
			<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/test" />
			<property name="hibernate.max_fetch_depth" value="5" />
			<property name="hibernate.jdbc.fetch_size" value="20" />
			<property name="hibernate.jdbc.batch_size" value="10" />
		
			<property name="hibernate.hbm2ddl.auto" value="update" />
			<property name="hibernate.show_sql" value="true" />
			<property name="hibernate.format_sql" value="false" />
		</properties>
	</persistence-unit>
</persistence>

测试，ok！