苍穹外卖day4 redis相关简单知识店铺营业状态设置

内存存储键值对 key-value 一般用于处理突发性大量请求数据操作（暂时浅显理解）

读写速度极快，常用于缓存数据，减少对数据库的访问压力，提高系统性能。例如，可以缓存用户会话、商品信息、页面数据

设置默认密码123456

Redis五种常见数据类型

哈希结构可以存对象及其属性集合可以用来查询公共元素让我联系到并查集的内容

有序集合zset/sorted set 可用来做排行榜

不同于MYSQL Redis操作需要判断当前数据类型再执行特定操作命令

setex key second value 短信验证码

setnx key value 只有在key不存在时设置key的值会在分布式锁涉及

哈希操作命令

列表操作命令按照插入顺序排序

> lrange mylist 0 -1 从栈头到栈尾 e d c b a

> lpop mylist e
> rpop mylist a

集合操作命令 Redis集合是无序集合且不能重复出现相同元素

有序集合操作

了解类知识接下来要部署在java项目里

原理上还是用上述语句 pom.xml配置再创建RedisConfig配置类在yml文件里构建redis关联

实现语句如下换汤不换药系列

@Configuration
@Slf4j
public class RedisConfiguration {
    @Bean
    public RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory){
        RedisTemplate redisTemplate = new RedisTemplate();
        //设计redis连接工厂对象
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        //设置redis key的序列化器 避免显示乱码
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        return redisTemplate;
    }
}
在yml文件里配置redis
  redis:
    host: localhost
    port: 6379
    password: 123456
    database: 0
@SpringBootTest
public class SpringDataRedisTest {
    @Autowired
    private RedisTemplate redisTemplate;
    @Test
    public void RedistTemplateTest(){
        System.out.println(redisTemplate);
        HashOperations hashOperations = redisTemplate.opsForHash();
        ListOperations listOperations = redisTemplate.opsForList();
        SetOperations setOperations = redisTemplate.opsForSet();
        ZSetOperations zSetOperations = redisTemplate.opsForZSet();
        ValueOperations valueOperations = redisTemplate.opsForValue();
    }

    /**
     * 操作字符串类型数据
     */
    @Test
    public void TestString(){
        //set get setex setnx
        redisTemplate.opsForValue().set("city","西安");
        String city = (String) redisTemplate.opsForValue().get("city");
        System.out.println(city);
        redisTemplate.opsForValue().set("code","1234",3, TimeUnit.MINUTES);
        redisTemplate.opsForValue().setIfAbsent("lock","1");
        redisTemplate.opsForValue().setIfAbsent("lock","2");
    }

    /**
     * 操作哈希类型数据
     */
    @Test
    public void TestHash(){
        //hset hget hdel hkeys hvals
        HashOperations hashOperations = redisTemplate.opsForHash();
        hashOperations.put("1000","name","tom");
        hashOperations.put("1000","age","20");

        String name = (String) hashOperations.get("1000", "name");
        System.out.println(name);

        Set keys = hashOperations.keys("1000");
        System.out.println(keys);

        List values = hashOperations.values("1000");
        System.out.println(values);

        hashOperations.delete("1000","age");
    }

    /**
     * 操作列表类型的数据
     */
    @Test
    public void testlist(){
        //lpush lrange rpop llen
        ListOperations listOperations = redisTemplate.opsForList();

        listOperations.leftPushAll("mylist", "a", "b", "c");
        listOperations.leftPush("mylist", "d");

        List mylist = listOperations.range("mylist", 0, -1);
        System.out.println(mylist);

        listOperations.rightPop("mylist");

        Long size = listOperations.size("mylist");
        System.out.println(size);
    }

    /**
     * 操作集合类型的数据
     */
    @Test
    public void testSet(){
        //sadd smembers scard sinter sunion srem
        SetOperations setOperations = redisTemplate.opsForSet();
        setOperations.add("set1", "a", "b", "c", "d");
        setOperations.add("set2", "a", "b", "x", "y");

        Set members = setOperations.members("set1");
        System.out.println(members);

        Long size = setOperations.size("set1");
        System.out.println(size);

        Set intersect = setOperations.intersect("set1", "set2");
        System.out.println(intersect);

        Set union = setOperations.union("set1", "set2");
        System.out.println(union);

        setOperations.remove("set1", "a", "b");
    }
    /**
     * 操作有序集合类型的数据
     */
    @Test
    public void testZset(){
        //zadd zrange zincrby zrem
        ZSetOperations zSetOperations = redisTemplate.opsForZSet();

        zSetOperations.add("zset1", "a", 10);
        zSetOperations.add("zset1", "b", 12);
        zSetOperations.add("zset1", "c", 9);

        Set zset1 = zSetOperations.range("zset1", 0, -1);
        System.out.println(zset1);

        zSetOperations.incrementScore("zset1", "c", 10);

        zSetOperations.remove("zset1", "a", "b");
    }
    /**
     * 通用命令操作
     */
    @Test
    public void testCommon(){
        //keys exists type del
        Set keys = redisTemplate.keys("*");
        System.out.println(keys);

        Boolean name = redisTemplate.hasKey("name");
        Boolean set1 = redisTemplate.hasKey("set1");

        for (Object key : keys) {
            DataType type = redisTemplate.type(key);
            System.out.println(type.name());
        }

        redisTemplate.delete("mylist");
    }

店铺营业状态设置

这里用到redis来存储当前营业状态为1（营业）还是0（未营业）