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Spring事务管理

事务的特性：
原子性：事务不可分割
一致性：事务执行前后数据完整性保持一致
隔离性：一个事务的执行不应该受到其他事务的干扰
持久性：一旦事务结束，数据就持久到数据库

Spring的事务管理分两类

编程式事务：自己写代码

申明式事务：（AOP原理）XML方式的声明式事务、注解方式的声明式事务

下面的demo都是以转账为例

下面是编程式事务的代码

DAO层：

public interface AccountDao {
    public void outMoney(String from, Double money);

    public void inMoney(String to, Double money);
}

import org.springframework.jdbc.core.support.JdbcDaoSupport;

public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {

    @Override
    public void outMoney(String from, Double money) {
        this.getJdbcTemplate().update("update account set money = money - ? where name  = ?", money, from);
    }

    @Override
    public void inMoney(String to, Double money) {
        this.getJdbcTemplate().update("update account set money = money + ? where name  = ?", money, to);
    }
}

服务层：

public interface AccountService {
    public void transfer(String from, String to, Double money);
}

import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;

public class AccountServiceImpl implements AccountService {

    private AccountDao accountDao;

    public void setAccountDao(AccountDao accountDao) {
        this.accountDao = accountDao;
    }

    //注入事务管理的模板
    private TransactionTemplate transactionTemplate;

    public void setTransactionTemplate(TransactionTemplate transactionTemplate) {
        this.transactionTemplate = transactionTemplate;
    }

    @Override
    public void transfer(String from, String to, Double money) {

        transactionTemplate.execute(new TransactionCallbackWithoutResult() {
            @Override
            protected void doInTransactionWithoutResult(TransactionStatus transactionStatus) {
                accountDao.outMoney(from, money);
//                int i = 1/0;
                accountDao.inMoney(to, money);
            }
        });
    }
}

配置文件tx.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"
       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.xsd">

    <bean id="accountService" class="com.jinke.tx.AccountServiceImpl">
        <property name="accountDao" ref="accountDao"/>
        <!--注入事务管理的模板-->
        <property name="transactionTemplate" ref="transactionTemplate"/>
    </bean>

    <bean id="accountDao" class="com.jinke.tx.AccountDaoImpl">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!--配置C3P0连接池-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driverClass}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!--配置Spring的JDBC的模板-->
    <!--<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>-->

    <!--配置平台事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--配置事务管理的模板-->
    <bean id="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate">
        <property name="transactionManager" ref="transactionManager"/>
    </bean>
</beans>

测试类

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:tx.xml")
public class demo {

    @Resource(name = "accountService")
    private AccountService accountService;

    @Test
    public void demo() {
        accountService.transfer("大傻", "dbcp", 1000d);
    }
}

接下来是声明式事务

XML方式

DAO层

public interface AccountDao {
    public void outMoney(String from, Double money);

    public void inMoney(String to, Double money);
}

import org.springframework.jdbc.core.support.JdbcDaoSupport;

public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {

    @Override
    public void outMoney(String from, Double money) {
        this.getJdbcTemplate().update("update account set money = money - ? where name  = ?", money, from);
    }

    @Override
    public void inMoney(String to, Double money) {
        this.getJdbcTemplate().update("update account set money = money + ? where name  = ?", money, to);
    }
}

服务层

public interface AccountService {
    public void transfer(String from, String to, Double money);
}

public class AccountServiceImpl implements AccountService {

    private AccountDao accountDao;

    public void setAccountDao(AccountDao accountDao) {
        this.accountDao = accountDao;
    }

    @Override
    public void transfer(String from, String to, Double money) {
        accountDao.outMoney(from, money);
        int i = 1 / 0;
        accountDao.inMoney(to, money);
    }
}

配置文件tx2.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" xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

    <bean id="accountService" class="com.jinke.tx2.AccountServiceImpl">
        <property name="accountDao" ref="accountDao"/>
    </bean>

    <bean id="accountDao" class="com.jinke.tx2.AccountDaoImpl">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!--配置C3P0连接池-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driverClass}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!--配置Spring的JDBC的模板-->
    <!--<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>-->

    <!--配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--配置事务的增强-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!--事务管理的规则-->
            <!-- <tx:method name="save" propagation="REQUIRED"/>
             <tx:method name="update" propagation="REQUIRED"/>
             <tx:method name="delete" propagation="REQUIRED"/>
             <tx:method name="find" read-only="true"/>-->
            <tx:method name="*" propagation="REQUIRED" read-only="false" timeout="-1"/>
        </tx:attributes>
    </tx:advice>

    <!--aop的配置-->
    <aop:config>
        <aop:pointcut id="pointcut1" expression="execution(* com.jinke.tx2.AccountServiceImpl.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pointcut1"/>
    </aop:config>

</beans>

IntelliJ自动生成的约束有点问题，需要自己修改

测试类

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:tx2.xml")
public class demo {

    @Resource(name = "accountService")
    private AccountService accountService;

    @Test
    public void demo() {
        accountService.transfer("大傻", "dbcp", 1000d);
    }
}

注解方式

DAO层

public interface AccountDao {
    public void outMoney(String from, Double money);

    public void inMoney(String to, Double money);
}

import org.springframework.jdbc.core.support.JdbcDaoSupport;

public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {

    @Override
    public void outMoney(String from, Double money) {
        this.getJdbcTemplate().update("update account set money = money - ? where name  = ?", money, from);
    }

    @Override
    public void inMoney(String to, Double money) {
        this.getJdbcTemplate().update("update account set money = money + ? where name  = ?", money, to);
    }
}

服务层

public interface AccountService {
    public void transfer(String from, String to, Double money);
}

import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

@Transactional(isolation = Isolation.DEFAULT, propagation = Propagation.REQUIRED)
public class AccountServiceImpl implements AccountService {

    private AccountDao accountDao;

    public void setAccountDao(AccountDao accountDao) {
        this.accountDao = accountDao;
    }

    @Override
    public void transfer(String from, String to, Double money) {
        accountDao.outMoney(from, money);
//        int i = 1 / 0;
        accountDao.inMoney(to, money);
    }
}

配置文件tx3.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/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <bean id="accountService" class="com.jinke.tx3.AccountServiceImpl">
        <property name="accountDao" ref="accountDao"/>
    </bean>

    <bean id="accountDao" class="com.jinke.tx3.AccountDaoImpl">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!--配置C3P0连接池-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driverClass}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!--配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--开启注解事务-->
    <tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

测试

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:tx3.xml")
public class demo {

    @Resource(name = "accountService")
    private AccountService accountService;

    @Test
    public void demo() {
        accountService.transfer("大傻", "dbcp", 1000d);
    }
}