关于java:Spring-事务

Spring 事务

个性

ACID:原子性,一致性,隔离性,持久性。

事务是一个不可分割的操作，其中的过程要么全副胜利要么全副失败。一旦实现后会对立提交来保障一致性。

不同的事务处理对立数据是隔离的,避免数据的损坏。事务的后果会被永恒的保留。

编程式事务

public class UserMapperImpl1 extends SqlSessionDaoSupport implements UserMapper{    private final PlatformTransactionManager transactionManager;    public UserMapperImpl1(PlatformTransactionManager transactionManager) {        this.transactionManager = transactionManager;    }    @Override    public List<User> selectUser() {        return getSqlSession().getMapper(UserMapper.class).selectUser();    }    @Override    public int addUser(User user) {        int a=0;        TransactionStatus txStatus =                transactionManager.getTransaction(new DefaultTransactionDefinition());        try{            getSqlSession().getMapper(UserMapper.class).addUser(user);            getSqlSession().getMapper(UserMapper.class).deleteUser(10);        }catch (Exception e){            transactionManager.rollback(txStatus);            throw e;        }        return a;    }  /* 此处和上述统一  //        TransactionTemplate transactionTemplate = new TransactionTemplate(transactionManager);//        a = transactionTemplate.execute(txStatus -> {//            getSqlSession().getMapper(UserMapper.class).addUser(user);//            getSqlSession().getMapper(UserMapper.class).deleteUser(10);//            return null;//        });    @Override    public int deleteUser(Integer id) {        return getSqlSession().getMapper(UserMapper.class).deleteUser(id);    }}

申明式事务

罕用两种传播方式:

propagation_requierd：如果以后没有事务，就新建一个事务，如果已存在一个事务中，退出到这个事务中，这是最常见的抉择。
propagation_nested：如果以后存在事务，则在嵌套事务内执行。如果以后没有事务，则执行与propagation_required相似的操作。

XML配置：

<?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: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-3.0.xsd   http://www.springframework.org/schema/tx   http://www.springframework.org/schema/tx/spring-tx-4.3.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">    <!--   引入数据源 -->    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>        <property name="url" value="jdbc:mysql://localhost:3306/test?useSSL=false&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>        <property name="username" value="root"/>        <property name="password" value="root"/>    </bean>    <!--    引入SQL工厂-->    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">        <property name="dataSource" ref="dataSource" />        <!--        关联mybatis配置-->        <property name="typeAliases" value="com.spring.pojo.User"/>        <!--        扫描包-->        <property name="mapperLocations" value="classpath:com/spring/mapper/*.xml"></property>    </bean>    <!--    注册sqlSessionTemplate , 关联sqlSessionFactory-->    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">        <!--利用结构器注入-->        <constructor-arg index="0" ref="sqlSessionFactory"/>    </bean><!--    配置申明式事务-->    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">        <property name="dataSource" ref="dataSource"/>    </bean>    <bean id="userMapper" class="com.spring.mapper.UserMapperImpl">        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>    </bean>    <!--配置事务告诉-->    <!--联合AOP实现事务的织入-->    <!--配置事务告诉-->    <tx:advice id="txAdvice" transaction-manager="transactionManager">        <!--给那些办法配置事务-->        <!--配置事务的流传个性： new -->        <tx:attributes>            <tx:method name="addUser" propagation="REQUIRED"/>            <tx:method name="deleteUser" propagation="REQUIRED"/>            <tx:method name="updateUser" propagation="REQUIRED"/>            <tx:method name="selectUser" read-only="true"/><!--            <tx:method name="*" propagation="REQUIRED"/>-->        </tx:attributes>    </tx:advice>    <aop:config>        <aop:pointcut id="txPointCut" expression="execution(* com.spring.mapper.UserMapper.*(..))"/>        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>    </aop:config></beans>

JAVA类：

public class UserMapperImpl extends SqlSessionDaoSupport implements UserMapper{    @Override    public List<User> selectUser() {        int a1 = getSqlSession().getMapper(UserMapper.class).addUser(new User(12,"wxn1"));        return getSqlSession().getMapper(UserMapper.class).selectUser();    }    @Override    public int addUser(User user) {        System.out.println("新增开始");        int a = getSqlSession().getMapper(UserMapper.class).addUser(user);        System.out.println("新增完结");        return a;    }    @Override    public int deleteUser(@Param(value = "id") Integer id) {        System.out.println("删除开始");        int a1 = getSqlSession().getMapper(UserMapper.class).addUser(new User(12,"wxn1"));        int a2 = getSqlSession().getMapper(UserMapper.class).deleteUser(id);        System.out.println("删除完结");        return a2;    }}

测试类:

public void selectUser() {        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");        UserMapper userMapper = context.getBean("userMapper", UserMapper.class);//        userMapper.addUser(new User(8,"丽丽1"));//        userMapper.deleteUser(10);        for (User user : userMapper.selectUser()) {            System.out.println(user);        }    }

Spring 事务

个性

分类

编程式事务

申明式事务