• spring事务


    1.导入jar包

    spring-tx...jar

    2.三个顶级接口

    2.1 PlatformTransactionManager:平台事务管理器,只要管理事务必须使用事务管理器

      进行事务配置时,必须配置事务管理器

      导入jar包:需要使用实现类,jdbc..jar  ,  orm...jar

    public interface PlatformTransactionManager {
    //通过事务详情获取事务状态,从而管理事务 TransactionStatus getTransaction(TransactionDefinition var1)
    throws TransactionException; //根据状态提交 void commit(TransactionStatus var1) throws TransactionException; //根据状态回滚 void rollback(TransactionStatus var1) throws TransactionException; }

    2.2TransactionDefinition:事务定义、事务详情、事务属性。用于确定具体事务,例如:隔离级别、是否只读、超时时间

      进行事务配置时,必须配置事务详情。spring将配置项封装到对象实例中。

     传播行为:两个业务如何共享事务

    PROPAGATION_REQUIRED , required , 必须  【默认值】

           支持当前事务,A如果有事务,B将使用该事务。

           如果A没有事务,B将创建一个新的事务。

    PROPAGATION_SUPPORTS ,supports ,支持

           支持当前事务,A如果有事务,B将使用该事务。

           如果A没有事务,B将以非事务执行。

    PROPAGATION_MANDATORY,mandatory ,强制

           支持当前事务,A如果有事务,B将使用该事务。

           如果A没有事务,B将抛异常。

    PROPAGATION_REQUIRES_NEW , requires_new ,必须新的

           如果A有事务,将A的事务挂起,B创建一个新的事务

           如果A没有事务,B创建一个新的事务

    PROPAGATION_NOT_SUPPORTED ,not_supported ,不支持

           如果A有事务,将A的事务挂起,B将以非事务执行

           如果A没有事务,B将以非事务执行

    PROPAGATION_NEVER ,never,从不

           如果A有事务,B将抛异常

           如果A没有事务,B将以非事务执行

    PROPAGATION_NESTED ,nested ,嵌套

           A和B底层采用保存点机制,形成嵌套事务。

    掌握:PROPAGATION_REQUIRED、PROPAGATION_REQUIRES_NEW、PROPAGATION_NESTED 

    2.3 TransactionStatus:事务状态,记录当前事务状态。例如:是否有保存点,事务是否已经完成

      spring底层根据具体状态进行操作

     3 事务管理:转账

     3.1 搭建环境

      导入jar包:

    核心:4+1

    aop:4 (aop联盟[规范],spring-aop【实现】,aspectJ规范,spring-aspectJ【实现】

    数据库:jdbc/tx

    驱动:mysql

    连接池:c3p0

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring"></property>
        <property name="user" value="root"></property>
        <property name="password" value="123"></property>
    </bean>
    <bean id="accountDao" class="dao.AccountDaoImp">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <bean id="accountService" class="service.AccountServiceImp">
        <property name="accountDao" ref="accountDao"></property>
    </bean>
    AccountDao
    public class AccountDaoImp extends JdbcDaoSupport implements AccountDao {
        @Override
        public void in(Account account, int money) {
            this.getJdbcTemplate().update("UPDATE account set balance=balance+? where id = ?",money,account.getId());
        }
    
        @Override
        public void out(Account account, int money) {
            this.getJdbcTemplate().update("UPDATE account set balance=balance-? where id = ?",money,account.getId());
        }
        @Test
        public void test(){
            String xmlPath = "applicationContext.xml";
            ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
            AccountDao accountDao = (AccountDao) applicationContext.getBean("accountDao");
            System.out.println(accountDao);
            accountDao.in(new Account(1,"",12),100);
        }
    }

    public class AccountServiceImp implements AccountService {
        private AccountDao accountDao;
    
        public void setAccountDao(AccountDao accountDao) {
            this.accountDao = accountDao;
        }
    
        @Override
        public void transfer(Account in, Account out, int money) {
            accountDao.out(out,money);
    //        int i = 1/0;
            accountDao.in(in,money);
        }
        @Test
        public void test(){
            String xmlPath = "applicationContext.xml";
            ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
            AccountService accountService = (AccountService) applicationContext.getBean("accountService");
            System.out.println(accountService);
            accountService.transfer(new Account(2,"",10),new Account(1,"",10),500);
        }
    }
    AccountDao

    3.2 手动管理事务管理器(了解)

       spring 底层使用TransactionTemplate事务模板进行操作

      (1)service需要获得并使用TransactionTemplate模板

      (2)spring配置模板,并注入给service

       (3)模板需要注入事务管理器

      (4)配置事务管理器:DataSourceTransactionTemplate

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring"></property>
        <property name="user" value="root"></property>
        <property name="password" value="123"></property>
    </bean>
    <bean id="accountDao" class="dao.AccountDaoImp">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <bean id="accountService" class="service.AccountServiceImp">
        <property name="accountDao" ref="accountDao"></property>
        <property name="transactionTemplate" ref="transactionTemplate"></property>
    </bean>
    <!--配置模板-->
    <bean id="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate">
        <property name="transactionManager" ref="transactionManager"></property>
    </bean>
    <!--配置事务管理器,需要事务,而事务从连接池中获得-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    applicationContext.xml
    public class AccountServiceImp implements AccountService {
        private AccountDao accountDao;
        private TransactionTemplate transactionTemplate;
    
        //需要spring注入事务模板
        public void setTransactionTemplate(TransactionTemplate transactionTemplate) {
            this.transactionTemplate = transactionTemplate;
        }
    
        public void setAccountDao(AccountDao accountDao) {
            this.accountDao = accountDao;
        }
    
        @Override
        public void transfer(final Account in,final Account out,final int money) {
            try{
                transactionTemplate.execute(new TransactionCallbackWithoutResult() {
                    @Override
                    protected void doInTransactionWithoutResult(TransactionStatus status) {
                        accountDao.out(out,money);
    //                    int i = 1/0;
                        accountDao.in(in,money);
                    }
                });
            }catch (Exception e){}
        }
    AccountServiceImp.java

    3.3 工厂bean生成代理:半自动

    配置bean:

      service 代理对象

    • proxyInterfaces 接口
    • target 目标类
    •  transactionManager 事务管理器
    • transactionAttributes 事务属性(事务详情)

    prop.key :确定哪些方法使用当前事务配置
    prop.text:用于配置事务详情
    格式:PROPAGATION,ISOLATION,readOnly,-Exception,+Exception
    传播行为 隔离级别 是否只读 异常回滚 异常提交
    例如:
    <prop key="transfer">PROPAGATION_REQUIRED,ISOLATION_DEFAULT</prop> 默认传播行为,和隔离级别
    <prop key="transfer">PROPAGATION_REQUIRED,ISOLATION_DEFAULT,readOnly</prop> 只读
    <prop key="transfer">PROPAGATION_REQUIRED,ISOLATION_DEFAULT,+java.lang.ArithmeticException</prop> 有异常扔提交

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
                                  http://www.springframework.org/schema/beans/spring-beans.xsd">
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
            <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring"></property>
            <property name="user" value="root"></property>
            <property name="password" value="123"></property>
        </bean>
        <bean id="accountDao" class="b_transaction_proxy_factoryBean.dao.AccountDaoImp">
            <property name="dataSource" ref="dataSource"></property>
        </bean>
        <bean id="accountService" class="b_transaction_proxy_factoryBean.service.AccountServiceImp">
            <property name="accountDao" ref="accountDao"></property>
        </bean>
        <!--配置生成事务代理对象的工厂bean-->
        <bean id="proxyAccountService" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
            <property name="proxyInterfaces" value="b_transaction_proxy_factoryBean.service.AccountService"></property>
            <property name="target" ref="accountService"></property>
            <!--配置事务管理器-->
            <property name="transactionManager" ref="txManager"></property>
            <!--配置事务详情(属性)-->
            <property name="transactionAttributes">
                <props>
                    <prop key="transfer">PROPAGATION_REQUIRED,ISOLATION_DEFAULT</prop>
                </props>
            </property>
        </bean>
        <!--配置事务管理器-->
        <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource"></property>
        </bean>
    applicationContext.xml
    public class AccountServiceImp implements AccountService {
        private AccountDao accountDao;
    
        public void setAccountDao(AccountDao accountDao) {
            this.accountDao = accountDao;
        }
    
        @Override
        public void transfer(Account in, Account out, int money) {
            accountDao.out(out, money);
            int i = 1 / 0;
            accountDao.in(in, money);
        }
    
    }
    AccountServiceImp.java

    3.4 AOP配置基于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: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/aop
                                  http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
            <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring"></property>
            <property name="user" value="root"></property>
            <property name="password" value="123"></property>
        </bean>
        <bean id="accountDao" class="c_transaction_aop.dao.impl.AccountDaoImp">
            <property name="dataSource" ref="dataSource"></property>
        </bean>
        <bean id="accountService" class="c_transaction_aop.service.impl.AccountServiceImp">
            <property name="accountDao" ref="accountDao"></property>
        </bean>
        <!--配置事务管理器-->
        <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource"></property>
        </bean>
        <!--配置通知(Advice),事务详情
            在aop筛选的基础上,确定具体方法使用什么事务。例如:AC只读,B读写
                propagation:传播行为
        -->
        <tx:advice id="txAdvice" transaction-manager="txManager">
            <!--配置事务详情的属性-->
            <tx:attributes>
                <tx:method name="transfer" propagation="REQUIRED" isolation="DEFAULT"/>
            </tx:attributes>
        </tx:advice>
        <!--配置生成事务代理对象的工厂bean-->
        <!--aop方式配置代理对象-->
        <aop:config proxy-target-class="true">
            <aop:pointcut id="pc" expression="execution(* c_transaction_aop.service.impl.*.*(..))"></aop:pointcut>
            <aop:advisor advice-ref="txAdvice" pointcut-ref="pc"></aop:advisor>
        </aop:config>
    
    </beans>
    applicationContext.xml

    3.5 AOP配置基于注解

     1.配置事务管理器,将事务交给spring

     2.在目标类或方法前加@Transactional

    <?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:tx="http://www.springframework.org/schema/tx"
           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/aop
                                  http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
            <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring"></property>
            <property name="user" value="root"></property>
            <property name="password" value="123"></property>
        </bean>
        <bean id="accountDao" class="d_transaction_aop_annotation.dao.impl.AccountDaoImp">
            <property name="dataSource" ref="dataSource"></property>
        </bean>
        <!--配置事务管理器-->
        <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource"></property>
        </bean>
        <!--将事务管理器交给spring
            transaction-manager:配置事务管理器
            proxy-target-class:强制使用cglib
            -->
        <tx:annotation-driven transaction-manager="txManager" proxy-target-class="true" />
    
        <!--扫描注解包-->
        <context:component-scan base-package="d_transaction_aop_annotation"></context:component-scan>
    </beans>
    applicationContex.xml
    Service("accountService")
    //配置详情(通知)
    @Transactional(propagation = Propagation.REQUIRED,isolation = Isolation.DEFAULT)
    public class AccountServiceImp implements AccountService {
        @Autowired
        @Qualifier("accountDao")
        private AccountDao accountDao;
    
        public void setAccountDao(AccountDao accountDao) {
            this.accountDao = accountDao;
        }
    
        @Override
        public void transfer(Account in, Account out, int money) {
            accountDao.out(out,money);
            int i = 1/0;
            accountDao.in(in,money);
        }
    }
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  • 原文地址:https://www.cnblogs.com/zhuxiang1633/p/8505274.html
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