学习笔记——Redis基础

Redis五种常用数据类型

Redis存储的是key-values结构的数据，其中key是字符串类型，value有五种常用的数据类型：

• 字符串（string）：普通字符串，Redis种最简单的数据类型
• 哈希(hash)：也叫散列，类似于java中的HashMap结构
• 列表(list)：按照插入顺序排序，可以有重复元素，类似于java中的LinkedList
• 集合(set)：无序集合，没有重复元素，类似于Java中的HashSet
• 有序集合(sorted set/zset)：集合中每个元素关联一个分数(score)，根据分数升序排序，没有重复元素

Redis常用命令

Spring Data Redis使用方式

操作步骤

1.导入Spring Data Redis的maven坐标

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

2.配置Redis数据源

redis:host: localhostport: 6379		// 端口号password: ******	// 密码database: 10	// 存储数据的数据库

3.编写配置类，创建RedisTemplate对象

import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;@Configuration
@Slf4j
public class RedisConffiguration {@Beanpublic RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory) {log.info("开始创建redis模板对象...");RedisTemplate redisTemplate = new RedisTemplate();//设置redis的连接工厂对象redisTemplate.setConnectionFactory(redisConnectionFactory);//设置redis key的序列化器redisTemplate.setKeySerializer(new StringRedisSerializer());return redisTemplate;}
}

4.通过RedisTemplate对象操作Redis

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.*;@SpringBootTest
public class SpringDataRedisTest {@Autowiredprivate RedisTemplate redisTemplate;@Testpublic void testRedisTemplate() {System.out.println(redisTemplate);ValueOperations valueOperations = redisTemplate.opsForValue();HashOperations hashOperations = redisTemplate.opsForHash();ListOperations listOperations = redisTemplate.opsForList();SetOperations setOperations = redisTemplate.opsForSet();ZSetOperations zSetOperations = redisTemplate.opsForZSet();}
}

各类型数据的操作：

/*** 操作字符串类型的数据*/@Testpublic void testString(){// set get setex setnxredisTemplate.opsForValue().set("name","小明");String city = (String) redisTemplate.opsForValue().get("name");System.out.println(city);redisTemplate.opsForValue().set("code","1234",3, TimeUnit.MINUTES);redisTemplate.opsForValue().setIfAbsent("lock","1");redisTemplate.opsForValue().setIfAbsent("lock","2");}/*** 操作哈希类型的数据*/@Testpublic void testHash() {// hset hget hdel hkeys hvalsHashOperations hashOperations = redisTemplate.opsForHash();hashOperations.put("100", "name", "tom");hashOperations.put("100", "age", "22");String name = (String) hashOperations.get("100", "name");System.out.println(name);Set keys = hashOperations.keys("100");System.out.println(keys);List values = hashOperations.values("100");System.out.println(values);hashOperations.delete("100", "age");}/*** 操作列表类型的数据*/@Testpublic void testList() {// lpush lrange rpop llenListOperations listOperation = redisTemplate.opsForList();listOperation.leftPushAll("mylist", "a", "b", "c");listOperation.leftPush("mylist", "d");List mylist = listOperation.range("mylist", 0, -1);System.out.println(mylist);listOperation.rightPop("mylist");Long size = listOperation.size("mylist");System.out.println(size);}/*** 操作集合类型的数据*/@Testpublic void testSet() {// sadd smembers scard sinter sunion sremSetOperations setOperation = redisTemplate.opsForSet();setOperation.add("set1", "a", "b", "c", "d");setOperation.add("set2", "a", "b", "x", "y");Set members = setOperation.members("set1");System.out.println(members);Long size = setOperation.size("set1");System.out.println(size);Set intersect = setOperation.intersect("set1", "set2");System.out.println(intersect);Set union = setOperation.union("set1", "set2");System.out.println(union);setOperation.remove("set1", "a", "b");}/*** 操作有序集合类型的数据*/@Testpublic void testZset() {// zadd zrange zincrby zremZSetOperations 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*/@Testpublic void testCommon() {// keys exists type delSet 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");}