redisson 分布式加锁

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

@RequestMapping("/m1")
public int insertUserT3() {

    String lockKey="lockKey";
   boolean ok= stringRedisTemplate.opsForValue().setIfAbsent("lockKey","m1");
   try
   {
       if (!ok)
       {
           return -1;
       }
       num=num+1;
       userServiceTest02.insertUser("m1",num );
   }finally {
       stringRedisTemplate.delete(lockKey);
   }
   
    return 1;
}

 

redisson 解决方案

Pom 的解决文件
<dependency>
   <groupId>org.redisson</groupId>
   <artifactId>redisson</artifactId>
   <version>3.11.1</version>
</dependency>

@Configuration
public class RedisConfig {

    @Bean("redission")
    public Redisson redissonClient() {
        Config config = new Config();
// 单机模式
        config.useSingleServer()
                .setAddress("redis://127.0.0.1:6379").setDatabase(0);
        return(Redisson)Redisson.create(config);
    }
}

@Autowired
Redisson redisson;
@RequestMapping("/mm")
public int insertUserT2() {

    String strKey="stockKey";
    RLock Redissionlock= redisson.getLock(strKey);
    try
    {
        Redissionlock.lock();
        num=num+1;
        userServiceTest02.insertUser("zhangsan",num );

    }
    finally {

        Redissionlock.unlock();
    }

    return 1;
}

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检查数据是否有重复

DELETE FROM users;
SELECT * FROM users WHERE age=2;

SELECT * FROM users GROUP BY age HAVING COUNT(age)>1;