声明式事务管理

声明事务管理（数据库连接池）

1.dao

package com.zhidi.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.sql.DataSource;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.zhidi.entity.Emp;

@Repository
public class EmpDao {
    @Autowired
    private DataSource dataSource;
    @Autowired
    private SessionFactory sessionFactory;

    public void query() {
        try {
            Connection connection = dataSource.getConnection();
            PreparedStatement statement = connection.prepareStatement("select * from emp");
            ResultSet set = statement.executeQuery();
            while (set.next()) {
                String name = set.getString("ename");
                System.out.println(name);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public void get(Integer id) {
        Session session = sessionFactory.getCurrentSession();
        session.beginTransaction();
        session.get(Emp.class, id);
        session.getTransaction().commit();
    }
    
    public Emp getById(Integer id)
    {
        Session session = sessionFactory.getCurrentSession();
        Emp emp=(Emp)session.get(Emp.class, id);
        return emp;
    }
    
    public void delete(Integer id)
    {
       Session session = sessionFactory.getCurrentSession();
       Emp emp=    getById(id);
       session.delete(emp);
       
    }
}

2.entity

package com.zhidi.entity;

import java.util.Date;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

@Entity
@Table(name = "emp")
public class Emp {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer empno;
    private String ename;
    @Temporal(TemporalType.DATE)
    private Date hiredate;

    public Integer getEmpno() {
        return empno;
    }

    public void setEmpno(Integer empno) {
        this.empno = empno;
    }

    public String getEname() {
        return ename;
    }

    public void setEname(String ename) {
        this.ename = ename;
    }

    public Date getHiredate() {
        return hiredate;
    }

    public void setHiredate(Date hierdate) {
        this.hiredate = hierdate;
    }

}

3.service

package com.zhidi.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import com.zhidi.dao.EmpDao;
import com.zhidi.entity.Emp;
@Transactional
@Service
public class EmpService {
    @Autowired
    private EmpDao empDao;
    @Transactional(propagation=Propagation.SUPPORTS,readOnly=true)
    public Emp getById(Integer id)
    {
        return empDao.getById(id);
    }
    
    public void deleteById(Integer id)
    {
        empDao.delete(id);
    }

}

4.test

package com.zhidi.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.zhidi.dao.EmpDao;

public class TestEmp {

    public static void main(String[] args) {
        @SuppressWarnings("resource")
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        EmpDao empDao = context.getBean(EmpDao.class);
        empDao.query();

        empDao.get(7965);
    }
}

package com.zhidi.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.zhidi.entity.Emp;
import com.zhidi.service.EmpService;

public class TestTx {
    
    public static void main(String[] args) {
        @SuppressWarnings("resource")
        ApplicationContext context =new ClassPathXmlApplicationContext("applicationContext.xml");
        EmpService service=context.getBean(EmpService.class);
        Emp emp=service.getById(7959);
        System.out.println(emp.getEname());
        
        service.deleteById(7951);
    
    }

}

5.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:aop="http://www.springframework.org/schema/aop"
    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-4.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">

    <!-- 打开配置 -->
    <!-- <context:component-scan base-package="com.zhidi" /> -->
    <context:property-placeholder location="jdpc.properties" /> 
    <!-- 将c3p0交给Spring的IOC容器管理 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 必要的配置 -->
        <property name="driverClass" value="${jdpc.driverClass}" />
        <property name="jdbcUrl" value="${jdpc.url}" />
        <property name="user" value="${jdpc.userName}" />
        <property name="password" value="${jdpc.password}" />
        <!-- 初始化连接数 -->
        <property name="initialPoolSize" value="3" />
        <!-- 最大连接数 -->
        <property name="maxPoolSize" value="10" />
        <!-- 最小连接数 -->
        <property name="minPoolSize" value="1"></property>
        <!-- 最大的连接时间8小时 -->
        <property name="maxConnectionAge" value="28800"></property>
        <!-- 需要防止8小时陷阱，需要设置时间小于8小时 -->
        <!-- 设置为6小时 -->
        <property name="maxIdleTime" value="21600"></property>
    </bean>

    <!-- 将LocalSessionFactoryBean交给Spring的IOC容器管理 -->
    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <!-- 将c3p0的数据源注入到SessionFactory -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 指定hibernate的配置信息 -->
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
                <!-- 删掉或者把 thread改为org.springframework.orm.hibernate4.SpringSessionContext-->
                <prop key="hibernate.current_session_context_class">org.springframework.orm.hibernate4.SpringSessionContext</prop>
            </props>
        </property>
        <!-- 指定扫描@entity的实体类 -->
        <property name="packagesToScan" value="com.zhidi.entity" />
    </bean>

    <!-- 定义hibernate的事务管理 -->
    <bean id="transactionManager"
        class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <!-- 将sessionFactory注入事务管理器中 -->
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
    <!-- 开启事务管理的配置 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
    
    <!-- 配置事务管理 -->
    <!-- <tx:advice id="txAdvice" transaction-manager="transactionManager">
        为不同的目标方法指定不同的事务属性
        <tx:attributes>
            name指定该事务属性对应的方法 propagation指事务的传播特性 read-only只读
            <tx:method name="add*" propagation="REQUIRED" />
            <tx:method name="save*" propagation="REQUIRED" />
            <tx:method name="delete*" propagation="REQUIRED" />
            <tx:method name="modeif*" propagation="REQUIRED" />
            <tx:method name="update*" propagation="REQUIRED" />
            <tx:method name="get*" propagation="SUPPORTS" read-only="true" />
            <tx:method name="query*" propagation="SUPPORTS" read-only="true" />
            <tx:method name="search*" propagation="SUPPORTS" read-only="true" />
            <tx:method name="*" propagation="SUPPORTS" read-only="true" />
        </tx:attributes>
    </tx:advice> -->
    
    <!-- 定义事务处理的AOP切面 -->
     <aop:config>
        <aop:advisor advice-ref="txAdvice"
            pointcut="execution(* com.zhidi.service..*.*(..))" />
    </aop:config> 

</beans>

6.properties

jdpc.driverClass=com.mysql.jdbc.Driver
jdpc.url=jdbc:mysql://localhost:3306/db_hibernate
jdpc.userName=root
jdpc.password=775297

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file hibernate.log ###
#log4j.appender.file=org.apache.log4j.FileAppender
#log4j.appender.file.File=hibernate.log
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=warn, stdout

#log4j.logger.org.hibernate=info
log4j.logger.org.hibernate=debug

### log HQL query parser activity
#log4j.logger.org.hibernate.hql.ast.AST=debug

### log just the SQL
#log4j.logger.org.hibernate.SQL=debug

### log JDBC bind parameters ###
log4j.logger.org.hibernate.type=info
#log4j.logger.org.hibernate.type=debug

### log schema export/update ###
log4j.logger.org.hibernate.tool.hbm2ddl=debug

### log HQL parse trees
#log4j.logger.org.hibernate.hql=debug

### log cache activity ###
#log4j.logger.org.hibernate.cache=debug

### log transaction activity
#log4j.logger.org.hibernate.transaction=debug

### log JDBC resource acquisition
#log4j.logger.org.hibernate.jdbc=debug

### enable the following line if you want to track down connection ###
### leakages when using DriverManagerConnectionProvider ###
#log4j.logger.org.hibernate.connection.DriverManagerConnectionProvider=trace