From 5a44269f131fd78d927989987f549a61d47b1600 Mon Sep 17 00:00:00 2001
From: Mingron <41795715+1autodidact@users.noreply.github.com>
Date: Thu, 10 Mar 2022 22:44:23 +0800
Subject: [PATCH 1/2] =?UTF-8?q?spring=20=E4=BA=8B=E5=8A=A1=20PROPAGATION?=
 =?UTF-8?q?=5FNESTED=E7=BA=A0=E9=94=99?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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ROPAGATION_NESTED：如果当前存在事务，就在嵌套事务内执行；如果当前没有事务，就执行与PROPAGATION_REQUIRED类似的操作，子事务回滚外部主事务也会受到影响进行回滚



```
@service
public class UserInvokeService {
    @Autowired
    private UserService userService;
    @resource
    private UserMapper userMapper;

    @transactional
    public void invokeUserService() {
        User user = new User();
        user.setName("zxx");
        user.setAge(333333);
        userMapper.insert(user);
        userService.insertData();

    }
}


@service
public class UserService {

    @resource
    private UserMapper userMapper;


    @transactional(propagation = Propagation.NESTED)
    public void insertData() {
        User user = new User();
        user.setName("inserByNested");
        user.setAge(2222);
        userMapper.insert(user);
        int a = 1 / 0;
    }

}


@SpringBootTest
public class TransactionalTest {
    @Autowired
    UserService userService;
    @Autowired
    UserInvokeService userInvokeService;
    @test
    public void testTransaction() {
        userInvokeService.invokeUserService();
    }
}
```
---
 .../framework/spring/spring-transaction.md        | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/docs/system-design/framework/spring/spring-transaction.md b/docs/system-design/framework/spring/spring-transaction.md
index 4be94772..cd9db83b 100644
--- a/docs/system-design/framework/spring/spring-transaction.md
+++ b/docs/system-design/framework/spring/spring-transaction.md
@@ -393,14 +393,13 @@ Class B {
 
 **3.`TransactionDefinition.PROPAGATION_NESTED`**:
 
-如果当前存在事务，则创建一个事务作为当前事务的嵌套事务来运行；如果当前没有事务，则该取值等价于`TransactionDefinition.PROPAGATION_REQUIRED`。也就是说：
-
-1. 在外部方法未开启事务的情况下`Propagation.NESTED`和`Propagation.REQUIRED`作用相同，修饰的内部方法都会新开启自己的事务，且开启的事务相互独立，互不干扰。
-2. 如果外部方法开启事务的话，`Propagation.NESTED`修饰的内部方法属于外部事务的子事务，外部主事务回滚的话，子事务也会回滚，而内部子事务可以单独回滚而不影响外部主事务和其他子事务。
+如果当前存在事务，就在嵌套事务内执行；如果当前没有事务，就执行与`TransactionDefinition.PROPAGATION_REQUIRED`类似的操作。也就是说：
 
+1. 在外部方法开启事务的情况下,在内部开启一个新的事务，作为嵌套事务存在。
+2. 如果外部方法无事务，则单独开启一个事务与 PROPAGATION_REQUIRED 类似
 这里还是简单举个例子：
 
-如果 `aMethod()` 回滚的话，`bMethod()`和`bMethod2()`都要回滚，而`bMethod()`回滚的话，并不会造成 `aMethod()` 和`bMethod()2`回滚。
+如果 `bMethod()` 回滚的话，`aMethod()`也会回滚。
 
 ```java
 Class A {
@@ -409,7 +408,6 @@ Class A {
         //do something
         B b = new B();
         b.bMethod();
-        b.bMethod2();
     }
 }
 
@@ -418,12 +416,7 @@ Class B {
     public void bMethod {
        //do something
     }
-    @Transactional(propagation=propagation.PROPAGATION_NESTED)
-    public void bMethod2 {
-       //do something
-    }
 }
-```
 
 **4.`TransactionDefinition.PROPAGATION_MANDATORY`**
 

From 3ac727a98aedf4edb7ab0fef96f16fa41c3c1f80 Mon Sep 17 00:00:00 2001
From: Mingron <41795715+1autodidact@users.noreply.github.com>
Date: Thu, 10 Mar 2022 22:52:53 +0800
Subject: [PATCH 2/2] Update spring-transaction.md

---
 docs/system-design/framework/spring/spring-transaction.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/system-design/framework/spring/spring-transaction.md b/docs/system-design/framework/spring/spring-transaction.md
index cd9db83b..d30269d3 100644
--- a/docs/system-design/framework/spring/spring-transaction.md
+++ b/docs/system-design/framework/spring/spring-transaction.md
@@ -417,6 +417,7 @@ Class B {
        //do something
     }
 }
+```
 
 **4.`TransactionDefinition.PROPAGATION_MANDATORY`**