java – 了解Spring Transaction边界

发布时间：2020-12-15 08:39:24 所属栏目：Java 来源：网络整理

导读：我试图清除我的疑虑w.r.t. Spring事务边界用以下示例. @Transactional(propagation=Propagation.REQUIRES_NEW)public void test() { test1(); test2(); }@Transactional(propagation=Propagation.NOT_SUPPORTED,readOnly=false)public void test1() { this.j

我试图清除我的疑虑w.r.t. Spring事务边界用以下示例.

@Transactional(propagation=Propagation.REQUIRES_NEW)
public void test() {    
    test1();
    test2();        
}

@Transactional(propagation=Propagation.NOT_SUPPORTED,readOnly=false)
public void test1() {
    this.jdbcTemplate.execute("INSERT INTO TEST VALUES('T','C2',1)");      
}

@Transactional(propagation=Propagation.SUPPORTS,isolation=Isolation.READ_UNCOMMITTED,readOnly=true)
public void test2() {
    System.out.println(this.jdbcTemplate.queryForInt("select count(*) from TEST"));         
}

我想从test1()中隔离test2()方法,每次调用test()时test2()都不应该读取test1()提交的数据.
请建议是否可以使用传播或隔离属性来处理此场景.

提前致谢.

解决方法

事务属性应用于外部调用,而不是由bean方法(如您的案例)进行的内部调用.如果您希望将事务边界应用于您的调用,则应该注入您的bean实例,如下所示.但我认为这不是一个好习惯,我不建议..正确的方法是定义另一个spring bean并将它与之前的bean相关联,并将测试方法放到这个新bean中.

@Service("yourBean")
@Transactional
public class YourBeanClass implement IYourBean {

   @Resource(name="yourBean")
    IYourBean yourBean;

        @Transactional(propagation=Propagation.REQUIRED)
    public void test() {    
        yourBean.test1();
        yourBean.test2();       
    }

    @Transactional(propagation=Propagation.REQUIRED)
    public void test1() {
        this.jdbcTemplate.execute("INSERT INTO TEST VALUES('T',1)");      
    }

    @Transactional(propagation=Propagation.NOT_SUPPORTED)
    public void test2() {
        System.out.println(this.jdbcTemplate.queryForInt("select count(*) from TEST"));         
    }

}

解决这一特定问题的替代方案和更好的方法;

@Service("otherBean")
    @Transactional
    public class OtherBeanClass implement IOtherBean {

     @Autowired
     IYourBean yourBean;

      @Transactional(propagation=Propagation.REQUIRED)
        public void test() {    
            yourBean.test1();
            yourBean.test2();       
        }

   }



    @Service("yourBean")
    @Transactional
    public class YourBeanClass implement IYourBean {



        @Transactional(propagation=Propagation.REQUIRED)
        public void test1() {
            this.jdbcTemplate.execute("INSERT INTO TEST VALUES('T',1)");      
        }

        @Transactional(propagation=Propagation.NOT_SUPPORTED)
        public void test2() {
            System.out.println(this.jdbcTemplate.queryForInt("select count(*) from TEST"));         
        }
}

（编辑：李大同）

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