Redis使用

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基本操作

General

# 返回给定模式的keys
KEYS patter
KEYS * # 返回全部
KEYS set* # 返回set开头的keys
EXISTS key
TYPE key
DEL key

String

SET key value
GET key
# Set Extend Time
SETEX key seconds value
# Set When Key Not Exist
SETNX key value

Hash

HSET key field value
HGET key field
HDEL key field
# Get All Fields
HKEYS key
# Get All Values
HVALS key
flowchart LR
    key[key]
    item[
    field1: value1
    field2: value2
    ]
    key --> item

List

LPUSH key value1 value2
# Get Key From Start To Stop
LRANGE key start stop
# Right POP
RPOP key
# List Length
LLEN key

Set

SADD key mem1 mem2
SMEMBERS key
# Set Size
SCARD key
SINTER key1 key2
SUNION key1 key2
# Delete
SREM key mem1 mem2

Sorted Set / ZSet

ZADD key score1 mem1 score2 mem2
# Show List
ZRANGE key start stop (WITHSCORES)
# Increse Member
ZINCRBY key increment member
ZREM key mem1 mem2

Redis for Java

  • Jedis (Official Recommand)
  • Lettuce
  • Spring Data Redis

Redis Data Redis

pom.xml
<!-- Redis -->
<dependency>
    <groupId>org.springframwork.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
application.yml
spring:
  redis:
    host: localhost
    port: 6379
    password: yourPassword
@Configuration
@Slf4j
public class RedisConfiguration {
    @Bean
    public RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        log.info("开始创建Redis模板对象...");
        RedisTemplate redisTemplate = new RedisTemplate();
        // Set Redis Connection Factory Object
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        // Set Key Serializer
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        return redisTemplate;
    }
}

持久化

RDB

# redis-cli
save
# 将会生成一个dump.rdb
bgsave
# 后台保存

AOF

保存执行的命令为日志。每次重启加载所有命令。

# redis.windows.conf
appendonly yes
appendsync always/everysec/no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb

# redis-cli
bgrewriteaof # 重新编排命令，让重启时执行更高效

事务

# 开始事务
multi

set key value
# ... your command
# 中途取消
discard

# 执行
exec

乐观锁

乐观锁：不认为别人会来抢占资源，所以会直接对数据进行操作，在操作时验证是否资源已被占用。

乐观锁会比较数据是否和原数据一致，一致，说明没有人抢占资源，可以修改。

watch key
# 通过版本号，而不通过值来判断
unwatch key