Integrating Spring and JPA

The second way to integrate spring and JPA is to get entitymanagerfactory by using Springframe's Localcontainerentitymanagerfactorybean.

Change the class reference for the previous fetch entitymanagerfactory:

<bean id= "Entitymanagerfactory" class= "Org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" >
<property name= "persistencexmllocation" value= "Classpath:meta-inf/persistence.xml"/>
</bean>

All we need to do is configure persistencexmllocation this property to specify the Meta-inf/persistence.xml inside the classpath.

This approach is a powerful way to configure JPA. Because it allows for flexible local configuration in the application. It supports connecting existing JDBC data sources, supporting local transactions (resource_local) and global Transactions (JTA).

In addition, can also be used with DataSource, our persistence.xml without writing the properties of the connection, directly to write the name and corresponding entity on it, for example:

<?xml version= "1.0" encoding= "UTF-8"?>
<persistence version= "1.0" 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 ">
<persistence-unit name= "Mypu" transaction-type= "resource_local" >
<provider>org.hibernate.ejb.HibernatePersistence</provider>

<class>myentiry. Userinfo</class>

</persistence-unit>

</persistence>

Spring's applicationcontext configuration file:

<bean id= "DataSource" class= "Org.apache.commons.dbcp.BasicDataSource" >
<property name= "Driverclassname" value= "Com.microsoft.sqlserver.jdbc.SQLServerDriver"/>
<property name= "url" value= "Jdbc:sqlserver://192.168.2.44:1433;databasename=test"/>
<property name= "username" value= "sa"/>
<property name= "password" value= "sa"/>
<property name= "InitialSize" value= "5"/>
<property name= "Minidle" value= "5"/>
<property name= "Maxidle" value= "/>"
<property name= "maxactive" value= "/>"
<property name= "maxwait" value= "1000"/>
</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= "Persistenceunitname" value= "Mypu"/>
<property name= "Jpavendoradapter" >
<bean class= "Org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" >
<property name= "Showsql" value= "false"/>
<property name= "Generateddl" value= "false"/>
</bean>
</property>
</bean>

Third-party approach is to use Jee:jndi-lookup to get entitymanagerfactory from Jndi

<bean>

<jee:jndi-lookup id= "Entitymanagerfactory" jndi-name= "Persistence/mypersistenceunit"/>

</bean>

In the business logic layer we have to use the @transactional annotation identifier, otherwise the method will not commit the transaction.

For spring transaction propagation and transaction isolation see:

hi.baidu.com/coolcat%5fpolice/blog/item/59ebc12324be8d4b935807d4.html