JPA Learning Note-spring Integrated JPA

Spring Consolidated JPA

Three ways to integrate:

-localentitymanagerfactorybean: For projects that use JPA for data access only, the Factorybean will work according to the JPA Persistenceprovider Auto-detect configuration file, typically from the " Meta-inf/persistence.xml "reads configuration information in the simplest way, but cannot set DataSource defined in spring and does not support spring-managed global transactions

-Obtained from Jndi: used to obtain the specified entitymanagerfactory from the Java EE server, which is typically used for JTA transaction management in Spring transaction management

-localcontainerentitymanagerfactorybean: Factorybean for all environments with full control of entitymanagerfactory configuration, such as specifying Spring-defined DataSource Wait a minute.

Directory structure

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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:tx=" Http://www.springframework.org/schema/tx "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-4.1.xsd    http:// www.springframework.org/schema/tx     http://www.springframework.org/schema/tx/ Spring-tx-4.0.xsd ><!--  enable annotation injection  --><!-- <context:annotation-config />  --><!--  Component Scan  --><context:component-scan base-package= "COM.JPA" ></ context:component-scan><!--  Import resource file  --><!-- <context:property-placeholder location= "Classpath:db.properties"  /> --><!--   Configure C3P0 data source  --><bean id= "DataSource"  class= "Com.mchange.v2.c3p0.ComboPooledDataSource "><property name=" user " value=" root "></property><property name=" password "  value= "" ></property><property name= "Driverclass"  value= "Com.mysql.jdbc.Driver" > </property><property name= "Jdbcurl"  value= "Jdbc:mysql:///test" ></property>< Property name= "Initialpoolsize"  value= "5" ></property><property name= "MaxPoolSize"  value= ></property></bean><!--  Configuration Entitymanagerfactory --><bean  id= "Entitymanagerfactory"  class= "Org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean "><property name=" DataSource " ref=" DataSource "></property><!--  Configuration &NBSP;JPA The   provider's adapter .  can be &n via the internalbsp;bean  Way to configure  --><property name= "Jpavendoradapter" ><bean class= " Org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter "></bean></property><!--  Configure the package that contains the entity class  --><property name= "Packagestoscan"  value= "Com.jpa.entities" ></property ><!--  Configuration  JPA  Basic properties .  such as  JPA  implementing product Properties  --><property name= " Jpaproperties "><props><prop key=" Hibernate.show_sql ">true</prop><prop key=" Hibernate.format_sql ">true</prop><prop key=" Hibernate.hbm2ddl.auto ">update</prop> </props></property></bean><!--  Configuration  JPA  using the transaction manager  --><bean id = "TransactionManager" class= "Org.springframework.orm.jpa.JpaTransactionManager" ><property name= " Entitymanagerfactory " ref=" entitymanagerfactory "></property></bean><!--  Configuration support based on annotations is a transactional configuration  --><tx:annotation-driven transaction-manager= "TransactionManager"/></beans> 

Person.java entity class

@Table (name = "Jpa_persons") @Entitypublic class Person {@GeneratedValue @idprivate Integer ID; @Column (name = "Last_Name") ) private string Lastname;private string email;private int Age;//getter Setter}

Persondao

@Repositorypublic class Persondao {//How to get the Entitymanager object associated with the current transaction? Tag member variables with @persistencecontext annotations @persistencecontextprivate entitymanager entitymanager;public void Save (person person) {entitymanager.persist (person);}}

Personservice

@Servicepublic class Personservice {@Autowiredprivate Persondao Persondao; @Transactionalpublic void Save (person P1, Person P2) {Persondao.save (p1); int i = 10/0;//throw exception, test transaction persondao.save (p2);}}

Test

Public class jpatest {private personservice personservice = null;private  ApplicationContext applicationContext = null; {Applicationcontext = new classpathxmlapplicationcontext ("applicationcontext.xml"); Personservice = applicationcontext.getbean (Personservice.class);} @Testpublic  void testdatasource ()  {DataSource dataSource =  Applicationcontext.getbean (Datasource.class); Try {system.out.println (Datasource.getconnection ());}  catch  (sqlexception e)  {// TODO Auto-generated catch  Blocke.printstacktrace ();}} @Testpublic  void testpersonservice ()  {person p1 = new person ();p 1.setAge (21 );p 1.setEmail ("[email protected]");p 1.setLastName ("SS"); Person p2 = new person ();p 2.setAge (;p 2.setEmail ("[email protected]"); P2.setlastname ("DD"); System.out.println (Personservice.getclass (). GetName ());p Ersonservice.save (P1, P2);}} 

Source: Http://yunpan.cn/cFzde9uLeFLJB Access Password 1aeb

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JPA Learning Note-spring Integrated JPA