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Spring中基于 xml 的声明式事务控制配置步骤
( 1 ) 配置事务管理器
( 2 ) 配置事务的通知
- 1 ) 导入事务的约束
- 2 ) 使用tx:advice标签配置事务通知
- 属性:
- id:给事务通知起一个唯一标识
- transaction-manager:给事务通知提供一个事务管理器引用
- 属性:
- 3 ) 配置AOP中的通用切入点表达式
- 4 ) 建立十五通知和切入点表达式的对应关系
- 5 ) 配置事务的属性(在事务的通知 tx : advice标签的内部)
- isolation:用于指定书屋的隔离级别,默认值为 DEFAULT,表示数据库的默认隔离级别
- propagation:用于指定事务的传播行为。默认值是REQUIRED,表示一定会有事务,增删改的选择。查询方法可以选择SUPPORTS。
- read-only:用于指定事务是否只读。只有查询方法才能设置为true。默认值是false,表示读写。
- timeout:用于指定事务的超时时间,默认值是-1,表示永不超时。如果指定了数值,以秒为单位。
- rollback-for:用于指定一个异常,当产生该异常时,事务回滚,产生其他异常时,事务不回滚。没有默认值。表示任何异常都回滚。
- no-rollback-for:用于指定一个异常,当产生该异常时,事务不回滚,产生其他异常时事务回滚。没有默认值。表示任何异常都回滚。
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基于xml配置实例
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bean.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/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!--configure service layer--> <bean id="accountService" class="com.itheima.service.AccountServiceImpl"> <property name="accountDao" ref="accountDao"></property> </bean> <!-- 配置账户的持久层--> <bean id="accountDao" class="com.itheima.dao.impl.AccountDaoImpl"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 配置数据源--> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver"></property> <property name="url" value="jdbc:mysql://localhost:3306/eesy"></property> <property name="username" value="root"></property> <property name="password" value="HotteMYSQL"></property> </bean> <!--Declarative transaction management--> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"></property> </bean> <!--configure transaction advice--> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="transfer" propagation="REQUIRED" read-only="false"/> <tx:method name="find*" propagation="SUPPORTS" read-only="true"></tx:method> </tx:attributes> </tx:advice> <!--configure pointcut expression--> <aop:config> <aop:pointcut id="pt1" expression="execution(* com.itheima.service.*.*(..))"></aop:pointcut> <aop:advisor advice-ref="txAdvice" pointcut-ref="pt1"></aop:advisor> </aop:config> </beans>
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IAccountDao
public interface IAccountDao { /** * 根据Id查询账户 * @param accountId * @return */ Account findAccountById(Integer accountId); /** * 根据名称查询账户 * @param accountName * @return */ Account findAccountByName(String accountName); /** * 更新账户 * @param account */ void updateAccount(Account account); }
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AccountDaoImpl
public class AccountDaoImpl extends JdbcDaoSupport implements IAccountDao { @Override public Account findAccountById(Integer accountId) { List<Account> accounts = super.getJdbcTemplate().query("select * from account where id = ?",new BeanPropertyRowMapper<Account>(Account.class),accountId); return accounts.isEmpty()?null:accounts.get(0); } @Override public Account findAccountByName(String accountName) { List<Account> accounts = super.getJdbcTemplate().query("select * from account where name = ?",new BeanPropertyRowMapper<Account>(Account.class),accountName); if(accounts.isEmpty()){ return null; } if(accounts.size()>1){ throw new RuntimeException("结果集不唯一"); } return accounts.get(0); } @Override public void updateAccount(Account account) { super.getJdbcTemplate().update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId()); } }
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Accont
public class Account implements Serializable { private Integer id; private String name; private Float money; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Float getMoney() { return money; } public void setMoney(Float money) { this.money = money; } @Override public String toString() { return "Account{" + "id=" + id + ", name='" + name + '\'' + ", money=" + money + '}'; } }
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IAccountService
/** * Service layer interface of the account */ public interface IAccountService { /** * query account information by id * @param accountId * @return */ Account findAccountById(Integer accountId); /** * transfer * @param sourceName transfer out account * @param targetName transfer to account * @param Money transfer amount */ void transfer(String sourceName, String targetName, Float Money); }
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AccountServiceImpl
public class AccountServiceImpl implements IAccountService{ private IAccountDao accountDao; public void setAccountDao(IAccountDao accountDao) { this.accountDao = accountDao; } @Override public Account findAccountById(Integer accountId) { return accountDao.findAccountById(accountId); } @Override public void transfer(String sourceName, String targetName, Float money) { System.out.println("transfer...."); //2.1根据名称查询转出账户 Account source = accountDao.findAccountByName(sourceName); //2.2根据名称查询转入账户 Account target = accountDao.findAccountByName(targetName); //2.3转出账户减钱 source.setMoney(source.getMoney()-money); //2.4转入账户加钱 target.setMoney(target.getMoney()+money); //2.5更新转出账户 accountDao.updateAccount(source); int i=1/0; //2.6更新转入账户 accountDao.updateAccount(target); } }
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AccountServiceTest
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = "classpath:bean.xml") public class AccountServiceTest { @Autowired private IAccountService as; @Test public void testTransfer(){ as.transfer("aaa","bbb",100f); } }
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Spring 中基于注解的声明式事务控制配置步骤
- 1 ) 配置事务管理器
- 2 ) 开启spring对注解事务的支持
- 3 ) 在需要事务支持的地方使用@Transactional注解