1)数据源 c3p0
<context:property-placeholder location="classpath:cn/com/legendapl/persistence/config/database.properties" /> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="driverClass" value="${jdbc.driverClass}" /> <property name="jdbcUrl" value="${jdbc.url}" /> <property name="user" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <property name="minPoolSize" value="${c3p0.minPoolSize}" /> <property name="maxPoolSize" value="${c3p0.maxPoolSize}" /> <property name="initialPoolSize" value="${c3p0.initialPoolSize}" /> </bean>
2)EntityManagerFactory
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <property name="showSql" value="true" /> <property name="generateDdl" value="true" /> </bean> </property> </bean>
3)事务管理器
标注或者xml方式随个人口味
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="dataSource" ref="dataSource" /> <property name="entityManagerFactory" ref="entityManagerFactory" /> </bean> <!-- <tx:advice id="txAdvice"> <tx:attributes> <tx:method name="find*" read-only="true"/> <tx:method name="*" propagation="REQUIRED"/> </tx:attributes> </tx:advice> <aop:config> <aop:pointcut expression="execution(* *..dao.impl..*(..))" id="dao-pc"/> <aop:pointcut expression="execution(* *..service.impl..*(..))" id="service-pc"/> <aop:advisor advice-ref="txAdvice" pointcut-ref="dao-pc"/> <aop:advisor advice-ref="txAdvice" pointcut-ref="service-pc"/> </aop:config> --> <tx:annotation-driven/>
4)异常转换
※要转换的组件上要加入@Repository标注
<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />
5)classpath*:META-INF/persistence.xml
<?xml version="1.0"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0" 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="hibernate" transaction-type="RESOURCE_LOCAL"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <class>cn.com.legendapl.persistence.domain.User</class> <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" /> <!-- <property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver"/> <property name="hibernate.connection.username" value="root"/> <property name="hibernate.connection.password" value="root"/> <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/itcast?useUnicode=true&characterEncoding=UTF-8"/> --> <property name="hibernate.max_fetch_depth" value="3" /> <property name="hibernate.hbm2ddl.auto" value="update" /> <property name="hibernate.jdbc.fetch_size" value="18" /> <property name="hibernate.jdbc.batch_size" value="10" /> <property name="hibernate.show_sql" value="true" /> <property name="hibernate.format_sql" value="true" /> </properties> </persistence-unit> </persistence>
6)DaoImpl例 (片段)
不要在DaoImpl的方法中使用 emf.createEntityManager();
这样为手动控制事务,事务的配置失效。
@Repository public class UserDaoImpl implements UserDao { @Resource(name = "entityManagerFactory") protected EntityManagerFactory emf; public void saveUser(User user) { EntityManager em = EntityManagerFactoryUtils.getTransactionalEntityManager(emf); em.persist(user); System.out.println(em.getFlushMode()); } public User findUserById(Integer id) { EntityManager em = EntityManagerFactoryUtils.getTransactionalEntityManager(emf); return em.find(User.class, id); } }
7)数据库信息
database.properties
#==================================================================================== # jdbc infomation # jdbc.dirverClass : 驱动类名 # jdbc.url : 数据库统一资源描述符 # jdbc.username : 数据库登录用户名 # jdbc.password : 数据库登录口令 #==================================================================================== jdbc.driverClass=com.mysql.jdbc.Driver jdbc.url=jdbc\:mysql\://localhost\:3306/income jdbc.username=root jdbc.password=root #==================================================================================== # c3p0 setting # c3p0.minPoolSize : 连接池最小保存的连接数量 # c3p0.maxPoolSize : 连接池最大保存的连接数量 # c3p0.initialPoolSize : 连接池被创建时保存的连接数量 # c3p0.maxIdleTime : 连接的最大空闲时间,超时不被使用则丢弃 # c3p0.acquireIncrement : 当连接耗尽时每次申请的连接数量 # c3p0.idleConnectionTestPeriod : 每间隔一定秒数秒检查所有连接池中的空闲连接 # c3p0.acquireRetryAttempts : 定义在从数据库获取新连接失败后重复尝试的次数 #==================================================================================== c3p0.minPoolSize=5 c3p0.maxPoolSize=30 c3p0.initialPoolSize=10 #c3p0.maxIdleTime=60 #c3p0.acquireIncrement=3 #c3p0.idleConnectionTestPeriod=60 #c3p0.acquireRetryAttempts=30 #c3p0.breakAfterAcquireFailure=true #==================================================================================== # hibernate setting # hibernate.dialect : 方言 #==================================================================================== hibernate.dialect=org.hibernate.dialect.MySQLDialect