XML-based transaction control

Add dependent jar package

<packaging>jar</packaging>

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.2.9.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.2.9.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.21</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>5.2.9.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>5.2.9.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.6</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13</version>
        <scope>test</scope>
    </dependency>
</dependencies>

Business Layer

public class AccountServiceImp implements AccountService {
    
    

    private AccountDao accountDao;

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

    @Override
    public Account findAccountById(int id) {
    
    
        return accountDao.findAccountById(id);
    }

    public void transfer(String sourceName, String targetName, float money) {
    
    
        Account sourceAccount = accountDao.findAccountByName(sourceName);
        Account targetAccount = accountDao.findAccountByName(targetName);
        sourceAccount.setAccount(sourceAccount.getAccount() - money);
        targetAccount.setAccount(targetAccount.getAccount() + money);
        accountDao.updateAccount(sourceAccount);
//        int a = 3 /0;
        accountDao.updateAccount(targetAccount);
    }
}

Persistence layer

public class AccountDaoImp extends JdbcDaoSupport implements AccountDao {
    
    


    @Override
    public Account findAccountByName(String name) {
    
    
        try {
    
    
            List<Account> accounts = getJdbcTemplate().query("select * from springaccount where name=?", new BeanPropertyRowMapper<Account>(Account.class),name);
            if (accounts == null || accounts.size() == 0){
    
    
                return null;
            }
            if (accounts.size() > 1){
    
    
                throw new RuntimeException("结果不唯一，数据有问题");
            }
            return accounts.get(0);
        }catch (Exception e){
    
    
            throw new RuntimeException(e);
        }
    }

    @Override
    public void updateAccount(Account account) {
    
    
        try {
    
    
            getJdbcTemplate().update("update springaccount set name=? ,account=? where id=?",account.getName(),account.getAccount(),account.getId());
        }catch (Exception e){
    
    
            throw new RuntimeException(e);
        }
    }

    @Override
    public Account findAccountById(int id) {
    
    
        try {
    
    
            List<Account> accounts = getJdbcTemplate().query("select * from springaccount where id=?", new BeanPropertyRowMapper<Account>(Account.class),id);
            return accounts.isEmpty() ? null : accounts.get(0);
        }catch (Exception e){
    
    
            throw new RuntimeException(e);
        }
    }
}

bean.xml

1. Configure the configuration steps of xml-based declaration transaction control in spring
   1. Configure transaction manager
   2. Notification of configuration transactions
      1. Use tx:advice tag table to configure transaction notification
         1. id attribute: provide a unique identifier for the transaction notification
         2. transaction-manager attribute: provide a transaction management reference for transaction notification
      2. Isolation: used to specify the isolation level of the transaction, the default value is DEFAULT, which means to use the default isolation level of the database.
      3. Propagation: Used to specify the propagation behavior of the transaction, the default value is REQUIRED, which means there will be transactions, and the choice of addition, deletion and modification. The query method can choose SUPPORTS.
      4. read-only: Used to specify whether the transaction is read-only. Only the query method can set true. The default value is false, which means read and write.
      5. timeout: used to specify the timeout period of the transaction, the default value is -1, which means never timeout, if the number is specified
      6. rollback-for: Used to specify an exception. When the exception occurs, the transaction rolls back, and when other exceptions occur, the transaction does not roll back. There is no default value, which means that any exceptions are rolled back.
      7. no-rollback-for: Used to specify an exception. When an exception occurs, the transaction does not roll back, and when other exceptions occur, the transaction rolls back. There is no default value. Indicates that any exceptions are rolled back.
   3. Configure general entry point expressions in AOP
   4. Establish the relationship between transaction notification and pointcut expression
   5. Configure the properties of the transaction
      1. Is inside the transaction notification tx:advice tag

<?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">

    <!--配置spring的ioc，把service对象配置进来-->
    <bean id="accountService" class="com.whut.service.imp.AccountServiceImp">
        <!-- 注入Dao-->
        <property name="accountDao" ref="accountDao"/>
    </bean>
    <!--配置Dao对象-->
    <bean id="accountDao" class="com.whut.dao.imp.AccountDaoImp">
        <!--注入dataSource-->
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--配置数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <!--连接数据库必备信息-->
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/my_db?serverTimezone=UTC"/>
        <property name="username" value="root"/>
        <property name="password" value="fy123"/>
    </bean>
    <!--配置spring中基于xml申明事务控制-->
    <!--配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--配置事务的通知-->
    <!--isolation：用于指定事务的隔离级别，默认值是DEFAULT，表示使用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，如果指定了数量
        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，当产生改异常时，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。
        -->

    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED" read-only="false"/>
            <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
        </tx:attributes>
    </tx:advice>

    <!--配置AOP-->
    <aop:config>
        <!--配置切入点表达式-->
        <aop:pointcut id="pt" expression="execution(* com.whut.service.imp.*.*(..))"/>
        <!--建立切入点表达式和事务通知的对应关系-->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pt"/>
    </aop:config>
</beans>