Redis 如何實現點贊、取消點贊

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"點贊是個頻率比較高的事件，也不是特別重要的記錄，使用緩存來存儲還是比較合理的，另外像排行榜、熱議等都可以使用緩存，用戶發起點贊、取消點贊後先存入 Redis 中，再每隔兩小時從 Redis 讀取點贊數據寫入數據庫中做持久化存儲。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong","attrs":{}}],"text":"點贊、取消點贊是高頻次的操作，若每次都讀寫數據庫，大量的操作會影響數據庫性能，所以需要做緩存。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"至於多久從 Redis 取一次數據存到數據庫中，根據項目的實際情況定吧，暫時設兩個小時。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"項目需求需要查看都誰點讚了，所以要存儲每個點讚的點贊人、被點贊人，不能簡單的做計數。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"文章分四部分介紹：","attrs":{}}]},{"type":"bulletedlist","content":[{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Redis 緩存設計及實現","attrs":{}}]}],"attrs":{}},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"數據庫設計","attrs":{}}]}],"attrs":{}},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"數據庫操作","attrs":{}}]}],"attrs":{}},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"開啓定時任務持久化存儲到數據庫","attrs":{}}]}],"attrs":{}}],"attrs":{}},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"一、Redis 緩存設計及實現","attrs":{}}]},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"Redis 與 SpringBoot 項目的整合","attrs":{}}]},{"type":"numberedlist","attrs":{"start":null,"normalizeStart":1},"content":[{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":1,"align":null,"origin":null},"content":[{"type":"text","text":"在 pom.xml 中引入依賴","attrs":{}}]}],"attrs":{}}]},{"type":"codeblock","attrs":{"lang":"java"},"content":[{"type":"text","text":"\n org.springframework.boot\n spring-boot-starter-data-redis\n","attrs":{}}]},{"type":"numberedlist","attrs":{"start":2,"normalizeStart":2},"content":[{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":2,"align":null,"origin":null},"content":[{"type":"text","text":"在啓動類上添加註釋 @EnableCaching","attrs":{}}]}],"attrs":{}}]},{"type":"codeblock","attrs":{"lang":"java"},"content":[{"type":"text","text":"@SpringBootApplication\n@EnableDiscoveryClient\n@EnableSwagger2\n@EnableFeignClients(basePackages = \"com.solo.coderiver.project.client\")\n@EnableCaching\npublic class UserApplication {\n\n public static void main(String[] args) {\n SpringApplication.run(UserApplication.class, args);\n }\n}","attrs":{}}]},{"type":"numberedlist","attrs":{"start":3,"normalizeStart":3},"content":[{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":3,"align":null,"origin":null},"content":[{"type":"text","text":"編寫 Redis 配置類 RedisConfig","attrs":{}}]}],"attrs":{}}]},{"type":"codeblock","attrs":{"lang":"java"},"content":[{"type":"text","text":"import com.fasterxml.jackson.annotation.JsonAutoDetect;\nimport com.fasterxml.jackson.annotation.PropertyAccessor;\nimport com.fasterxml.jackson.databind.ObjectMapper;\nimport org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;\nimport org.springframework.context.annotation.Bean;\nimport org.springframework.context.annotation.Configuration;\nimport org.springframework.data.redis.connection.RedisConnectionFactory;\nimport org.springframework.data.redis.core.RedisTemplate;\nimport org.springframework.data.redis.core.StringRedisTemplate;\nimport org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;\nimport java.net.UnknownHostException;\n\n@Configuration\npublic class RedisConfig {\n\n @Bean\n @ConditionalOnMissingBean(name = \"redisTemplate\")\n public RedisTemplate redisTemplate(\n RedisConnectionFactory redisConnectionFactory)\n throws UnknownHostException {\n\n Jackson2JsonRedisSerializer