Java在各种框架下编译Scala 【三】

设置Spring bean访问和调用的数据库

要定义这些Spring bean，创建main/resources的beans.xml以及一下的内容：

<?xml?version="1.0"?encoding="UTF-8"??>??????? ?<beansxmlnsbeansxmlns="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-3.0.xsd???????? ??????????http://www.springframework.org/schema/context??????? ????????? ?????????http://www.springframework.org/schema/context/spring-context-3.0.xsd???????? ??????????http://www.springframework.org/schema/tx??????? ????????? ?????????http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">???????? ??????<context:component-scan?base-package="com.foo.myapp"/>??????? ????????? ?????<bean?id="emf"class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">???????? ?????????<property?name="persistenceXmlLocation"value="classpath:/META-INF/my-persistence.xml"/>???????? ??????</bean>??????? ?????<bean?id="transactionManager"class="org.springframework.orm.jpa.JpaTransactionManager">???????? ????????? ?????????<property?name="entityManagerFactory"?ref="emf"/>???????? ??????</bean>??????? ????????? ?????<tx:annotation-driven?/>???????? ?</beans>?

读取数据库配置中persistence.xml文件。在这里，您将获得一个主目录中名为MyApp的H2数据库。因此，创建main/resources/META-INF文件的内容如下。

<persistencexmlnspersistencexmlns="http://java.sun.com/xml/ns/persistence"???????? ?????????????xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"????????? ????????? ?????????????xsi:schemaLocation="http://java.sun.com/xml/ns/persistencehttp://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"????????? ??????????????version="2.0">???????? ????????? ????<persistence-unit?name="myapp"?transaction-type="RESOURCE_LOCAL">????????? ?????????<provider>org.hibernate.ejb.HibernatePersistence</provider>???????? ????????? ?????????<properties>???????? ????????????<propertynamepropertyname="hibernate.connection.driver_class"value="org.h2.Driver"/>????????? ????????? ????????????<property?name="hibernate.connection.url"value="jdbc:h2:tcp://localhost/~/myapp"/>????????? ?????????????<propertynamepropertyname="hibernate.connection.username"?value="sa"/>???????? ????????? ?????????????<propertynamepropertyname="hibernate.connection.password"?value=""/>???????? ????????????<property?name="hibernate.dialect"value="org.hibernate.dialect.H2Dialect"/>????????? ????????? ????????????<property?name="hibernate.hbm2ddl.auto"value="create"/>????????? ?????????</properties>???????? ????????? ????</persistence-unit>????????? ?/persistence>???????