一 锁加在事务之内
@Transactional(rollbackFor = Exception.class)
public void addError(User user) {
log.info("add user params user:{}", JSON.toJSONString(user));
Assert.isTrue(StringUtils.isNotBlank(user.getIdCard()), "身份证号不允许null");
String key = "key";
RLock lock = redissonClient.getLock(key);
lock.lock();
try {
LambdaQueryWrapper<User> wrapper = new LambdaQueryWrapper<User>()
.eq(User::getIdCard, user.getIdCard());
long count = userMapper.selectCount(wrapper);
if (count == 0) {
userMapper.insert(user);
}
} catch (Exception e) {
log.error("add user error", e);
} finally {
lock.unlock();
}
System.out.println("并发执行，同时插入了两条");
}
在线程1释放锁后事务还没提交，数据库没有内容
线程2获取锁执行逻辑，查询数据库没有需要锁的值
最终结果插入两条
二 错误的事务传播
a服务
@Override
@Transactional(rollbackFor = Exception.class)
public void a() {
try {
userServiceB.b();
} catch (Exception e) {
e.printStackTrace();
}
User user = new User();
LambdaQueryWrapper<User> wrapper = new LambdaQueryWrapper<User>()
.eq(User::getIdCard, "1000");
User user1 = userMapper.selectOne(wrapper);
user1.setName("zhangsan");
userMapper.updateById(user1);
}
b服务
@Override
@Transactional(rollbackFor = Exception.class)
public void b() {
User user = new User();
LambdaQueryWrapper<User> wrapper = new LambdaQueryWrapper<User>()
.eq(User::getIdCard, "1000");
User user1 = userMapper.selectOne(wrapper);
user1.setName("lisi");
userMapper.updateById(user1);
System.out.println(1 / 0);
}
报错：
2023-03-21 14:24:25 DEBUG - [ main] work.jdbc.support.JdbcTransactionManager.etTransaction 370 : Creating new transaction with name [com.lx.debug.idempotent.moduler.service.impl.UserServiceAImpl.a]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT,-java.lang.Exception
2023-03-21 14:24:25 INFO - [ main] com.zaxxer.hikari.HikariDataSource .getConnection 110 : HikariPool-1 - Starting...
2023-03-21 14:24:25 WARN - [ main] com.zaxxer.hikari.util.DriverDataSource . <init> 70 : Registered driver with driverClassName=com.mysql.jdbc.Driver was not found, trying direct instantiation.
2023-03-21 14:24:25 INFO - [ main] com.zaxxer.hikari.HikariDataSource .getConnection 123 : HikariPool-1 - Start completed.
2023-03-21 14:24:25 DEBUG - [ main] work.jdbc.support.JdbcTransactionManager. doBegin 267 : Acquired Connection [HikariProxyConnection@1514631948 wrapping com.mysql.cj.jdbc.ConnectionImpl@15369d73] for JDBC transaction
2023-03-21 14:24:25 DEBUG - [ main] work.jdbc.support.JdbcTransactionManager. doBegin 285 : Switching JDBC Connection [HikariProxyConnection@1514631948 wrapping com.mysql.cj.jdbc.ConnectionImpl@15369d73] to manual commit
2023-03-21 14:24:26 DEBUG - [ main] work.jdbc.support.JdbcTransactionManager.ngTransaction 470 : Participating in existing transaction
2023-03-21 14:24:26 DEBUG - [ main] ent.moduler.mapper.UserMapper.selectList. debug 137 : ==> Preparing: SELECT id,name,id_card,age,email,is_delete FROM user WHERE is_delete=0 AND (id_card = ?)
2023-03-21 14:24:26 DEBUG - [ main] ent.moduler.mapper.UserMapper.selectList. debug 137 : ==> Parameters: 1000(String)
2023-03-21 14:24:26 DEBUG - [ main] ent.moduler.mapper.UserMapper.selectList. debug 137 : <== Total: 1
2023-03-21 14:24:26 DEBUG - [ main] ent.moduler.mapper.UserMapper.updateById. debug 137 : ==> Preparing: UPDATE user SET name=?, id_card=?, age=?, email=? WHERE id=? AND is_delete=0
2023-03-21 14:24:26 DEBUG - [ main] ent.moduler.mapper.UserMapper.updateById. debug 137 : ==> Parameters: lisi(String), 1000(String), 1(Integer), 1(String), 1000(Long)
java.lang.ArithmeticException: / by zero
at com.lx.debug.idempotent.moduler.service.impl.UserServiceBImpl.b(UserServiceBImpl.java:30)
2023-03-21 14:24:26 DEBUG - [ main] ent.moduler.mapper.UserMapper.updateById. debug 137 : <== Updates: 1
2023-03-21 14:24:26 DEBUG - [ main] work.jdbc.support.JdbcTransactionManager.ocessRollback 842 : Participating transaction failed - marking existing transaction as rollback-only
2023-03-21 14:24:26 DEBUG - [ main] work.jdbc.support.JdbcTransactionManager.tRollbackOnly 359 : Setting JDBC transaction [HikariProxyConnection@1514631948 wrapping com.mysql.cj.jdbc.ConnectionImpl@15369d73] rollback-only
2023-03-21 14:24:26 DEBUG - [ main] ent.moduler.mapper.UserMapper.selectList. debug 137 : ==> Preparing: SELECT id,name,id_card,age,email,is_delete FROM user WHERE is_delete=0 AND (id_card = ?)
2023-03-21 14:24:26 DEBUG - [ main] ent.moduler.mapper.UserMapper.selectList. debug 137 : ==> Parameters: 1000(String)
2023-03-21 14:24:26 DEBUG - [ main] ent.moduler.mapper.UserMapper.selectList. debug 137 : <== Total: 1
2023-03-21 14:24:26 DEBUG - [ main] ent.moduler.mapper.UserMapper.updateById. debug 137 : ==> Preparing: UPDATE user SET name=?, id_card=?, age=?, email=? WHERE id=? AND is_delete=0
2023-03-21 14:24:26 DEBUG - [ main] ent.moduler.mapper.UserMapper.updateById. debug 137 : ==> Parameters: zhangsan(String), 1000(String), 1(Integer), 1(String), 1000(Long)
2023-03-21 14:24:26 DEBUG - [ main] ent.moduler.mapper.UserMapper.updateById. debug 137 : <== Updates: 1
2023-03-21 14:24:26 DEBUG - [ main] work.jdbc.support.JdbcTransactionManager. commit 705 : Global transaction is marked as rollback-only but transactional code requested commit
2023-03-21 14:24:26 DEBUG - [ main] work.jdbc.support.JdbcTransactionManager.ocessRollback 833 : Initiating transaction rollback
2023-03-21 14:24:26 DEBUG - [ main] work.jdbc.support.JdbcTransactionManager. doRollback 345 : Rolling back JDBC transaction on Connection [HikariProxyConnection@1514631948 wrapping com.mysql.cj.jdbc.ConnectionImpl@15369d73]
2023-03-21 14:24:26 DEBUG - [ main] work.jdbc.support.JdbcTransactionManager.terCompletion 389 : Releasing JDBC Connection [HikariProxyConnection@1514631948 wrapping com.mysql.cj.jdbc.ConnectionImpl@15369d73] after transaction
org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-only
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback(AbstractPlatformTransactionManager.java:870)
从日志可以看出
B服务提交的时候将当前事务标记为回滚
marking existing transaction as rollback-only
A服务捕获住异常后提交事务，发现当前事务被标记为 rollback-only
随后抛出异常，A服务既没有提交，也没有回滚