spring @Transactional 声明式事务

项目地址：git@github.com:witaste/transaction-annotation.git

情景一：

A external method calls a method of the target object 

外部方法调用目标对象的事务方法，异常逐层抛出，最终由a() 抛出，可以回滚。

@Service
public class FooServiceImpl implements FooService {

    @Autowired
    private FooMapper fooMapper;

    @Transactional(propagation = Propagation.REQUIRED)
    public void a() {
        b();
    }

    public void b() {
        fooMapper.insert(new Foo("1"));
        int i = 1 / 0;
        fooMapper.insert(new Foo("2"));
    }
}

情景二：

The target object call another method of the target object  

不能开启事务，插入了一条数据。

@Service
public class FooServiceImpl implements FooService {

    @Autowired
    private FooMapper fooMapper;

    public void a() {
        try {
            b();
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }

    @Transactional(propagation = Propagation.REQUIRED)
    public void b() {
        fooMapper.insert(new Foo("1"));
        int i = 1 / 0;
        fooMapper.insert(new Foo("2"));
    }
}

情景二解决办法：

办法1.

将b() 转移到OtServiceImpl 中即可。

办法2.

使用代理对象调用b() , 即：

((FooService) AopContext.currentProxy()).b();

需要引入jar包

        <!-- aspectj -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.8.7</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.7</version>
        </dependency>

需要暴露代理：

<aop:aspectj-autoproxy expose-proxy="true"/>

修改后的类：

@Service
public class FooServiceImpl implements FooService {

    @Autowired
    private FooMapper fooMapper;

    public void a() {
        try{
            ((FooService) AopContext.currentProxy()).b();
        }catch(Exception e){
            System.out.println(e.getMessage());
        }
    }

    @Transactional(propagation = Propagation.REQUIRED)
    public void b() {
        fooMapper.insert(new Foo("1"));
        int i = 1 / 0;
        fooMapper.insert(new Foo("2"));
    }
}

PS:其他复杂情景不做考虑

官方文档：http://docs.spring.io/spring/docs/4.2.0.RC1/spring-framework-reference/htmlsingle/#transaction-declarative-annotations

附运行日志：

情景一： 

16:02:27.372 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Creating a new SqlSession
16:02:27.372 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Registering transaction synchronization for SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@14d3d6d]
16:02:27.403 [main] DEBUG o.m.s.t.SpringManagedTransaction - JDBC Connection [33362707, URL=jdbc:oracle:thin:@//172.16.50.67:1521/orcl, UserName=E_CHANNEL, Oracle JDBC driver] will be managed by Spring
16:02:27.403 [main] DEBUG c.zno.dao.FooMapper.insert!selectKey - ooo Using Connection [33362707, URL=jdbc:oracle:thin:@//172.16.50.67:1521/orcl, UserName=E_CHANNEL, Oracle JDBC driver]
16:02:27.403 [main] DEBUG c.zno.dao.FooMapper.insert!selectKey - ==>  Preparing: select sys_guid() from dual 
16:02:27.513 [main] DEBUG c.zno.dao.FooMapper.insert!selectKey - ==> Parameters: 
16:02:27.872 [main] DEBUG cn.zno.dao.FooMapper.insert - ooo Using Connection [33362707, URL=jdbc:oracle:thin:@//172.16.50.67:1521/orcl, UserName=E_CHANNEL, Oracle JDBC driver]
16:02:27.872 [main] DEBUG cn.zno.dao.FooMapper.insert - ==>  Preparing: insert into FOO (ID, NAME) values (?, ?) 
16:02:27.872 [main] DEBUG cn.zno.dao.FooMapper.insert - ==> Parameters: 220CFD8EE4A60CF3E053433210AC3DFB(String), 1(String)
16:02:27.903 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@14d3d6d]
16:02:27.950 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization rolling back SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@14d3d6d]
16:02:27.950 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization closing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@14d3d6d]

情景二：

16:09:12.544 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Creating a new SqlSession
16:09:12.544 [main] DEBUG org.mybatis.spring.SqlSessionUtils - SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@db15e1] was not registered for synchronization because synchronization is not active
16:09:12.622 [main] DEBUG o.m.s.t.SpringManagedTransaction - JDBC Connection [24683438, URL=jdbc:oracle:thin:@//172.16.50.67:1521/orcl, UserName=E_CHANNEL, Oracle JDBC driver] will not be managed by Spring
16:09:12.622 [main] DEBUG c.zno.dao.FooMapper.insert!selectKey - ooo Using Connection [24683438, URL=jdbc:oracle:thin:@//172.16.50.67:1521/orcl, UserName=E_CHANNEL, Oracle JDBC driver]
16:09:12.622 [main] DEBUG c.zno.dao.FooMapper.insert!selectKey - ==>  Preparing: select sys_guid() from dual 
16:09:12.732 [main] DEBUG c.zno.dao.FooMapper.insert!selectKey - ==> Parameters: 
16:09:12.794 [main] DEBUG cn.zno.dao.FooMapper.insert - ooo Using Connection [24683438, URL=jdbc:oracle:thin:@//172.16.50.67:1521/orcl, UserName=E_CHANNEL, Oracle JDBC driver]
16:09:12.794 [main] DEBUG cn.zno.dao.FooMapper.insert - ==>  Preparing: insert into FOO (ID, NAME) values (?, ?) 
16:09:12.794 [main] DEBUG cn.zno.dao.FooMapper.insert - ==> Parameters: 220D15B5E3891024E053433210AC7FE0(String), 1(String)
16:09:12.841 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@db15e1]
/ by zero

情景二改：

16:12:13.466 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Creating a new SqlSession
16:12:13.482 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Registering transaction synchronization for SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@14d3d6d]
16:12:13.513 [main] DEBUG o.m.s.t.SpringManagedTransaction - JDBC Connection [33362707, URL=jdbc:oracle:thin:@//172.16.50.67:1521/orcl, UserName=E_CHANNEL, Oracle JDBC driver] will be managed by Spring
16:12:13.513 [main] DEBUG c.zno.dao.FooMapper.insert!selectKey - ooo Using Connection [33362707, URL=jdbc:oracle:thin:@//172.16.50.67:1521/orcl, UserName=E_CHANNEL, Oracle JDBC driver]
16:12:13.513 [main] DEBUG c.zno.dao.FooMapper.insert!selectKey - ==>  Preparing: select sys_guid() from dual 
16:12:13.622 [main] DEBUG c.zno.dao.FooMapper.insert!selectKey - ==> Parameters: 
16:12:13.685 [main] DEBUG cn.zno.dao.FooMapper.insert - ooo Using Connection [33362707, URL=jdbc:oracle:thin:@//172.16.50.67:1521/orcl, UserName=E_CHANNEL, Oracle JDBC driver]
16:12:13.685 [main] DEBUG cn.zno.dao.FooMapper.insert - ==>  Preparing: insert into FOO (ID, NAME) values (?, ?) 
16:12:13.685 [main] DEBUG cn.zno.dao.FooMapper.insert - ==> Parameters: 220D207E0A56111CE053433210ACAD95(String), 1(String)
16:12:13.716 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@14d3d6d]
16:12:13.747 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization rolling back SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@14d3d6d]
16:12:13.747 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization closing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@14d3d6d]
/ by zero
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原文地址：https://www.cnblogs.com/zno2/p/4767565.html