[英]Isolation level repeatable read spring boot
我的Spring Boot代码有问题。 我试图用@Transactional注释理解隔离级别,并给出以下代码:
//BookingService class bookingService2 instance
@Transactional(isolation = Isolation.REPEATABLE_READ)
public String readConstantly() throws InterruptedException {
String name = "";
for(int i=0; i<2; i++) {
name = jdbcTemplate.query("select FIRST_NAME from BOOKINGS where ID=1", (rs, rowNum) -> rs.getString("FIRST_NAME")).get(0);
logger.info("Read name " + name);
Thread.sleep(1000);
}
return name;
}
和此代码:
//BookingService class bookingService instance
@Transactional
public void updateOne(){
jdbcTemplate.update("update BOOKINGS set FIRST_NAME = ? where ID = 1", "zz");
}
像这样执行:
new Thread(() -> {
try {
bookingService2.readConstantly();
} catch (InterruptedException e) {
e.printStackTrace();
}
}).start();
bookingService.updateOne();
我希望updateOne等到readConstantly事务结束,但是当我调用它时,将输出:
2016-11-30 12:29:15.158 INFO 6456 --- [ Thread-3] hello.BookingService : Read name Alice
2016-11-30 12:29:16.158 INFO 6456 --- [ Thread-3] hello.BookingService : Read name zz
我试图了解为什么在这种情况下隔离级别没有做很多工作?
以此看来,H2不支持可重复读取。 您可能需要使用“可序列化”代替。
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