redis入门：一些常用命令
• Redis是一款基于键值对的NoSQL数据库，它的值支持多种数据结构： 字符串(strings)、哈希(hashes)、列表(lists)、集合(sets)、有序集合(sorted sets)等。
• Redis将所有的数据都存放在内存中，所以它的读写性能十分惊人。 同时，Redis还可以将内存中的数据以快照或日志的形式保存到硬盘上，以保证数据的安全性。
• Redis典型的应用场景包括：缓存、排行榜、计数器、社交网络、消息队列等。
Microsoft Windows [版本 10.0.19044.1645]
(c) Microsoft Corporation。保留所有权利。
C:\Users\M>redis-cli
127.0.0.1:6379> select 1
OK
127.0.0.1:6379[1]> select 0
OK
127.0.0.1:6379> flushdb
OK
127.0.0.1:6379> set test:count 1
OK
127.0.0.1:6379> get test:count
"1"
127.0.0.1:6379> incr test:count
(integer) 2
127.0.0.1:6379> decr test:count
(integer) 1
127.0.0.1:6379> hset test:user id 1
(integer) 1
127.0.0.1:6379> hset test:user username zhangsan
(integer) 1
127.0.0.1:6379> hget test:user id
"1"
127.0.0.1:6379> hget test:user username
"zhangsan"
127.0.0.1:6379> lpush test:ids 101 102 103
(integer) 3
127.0.0.1:6379> llen test:lds
(integer) 0
127.0.0.1:6379> llen test:ids
(integer) 3
127.0.0.1:6379> lindex test:ids 0
"103"
127.0.0.1:6379> lindex test:ids 2
"101"
127.0.0.1:6379> lrange test:ids 0 2
1) "103"
2) "102"
3) "101"
127.0.0.1:6379> rpop test:ids
"101"
127.0.0.1:6379> lpop test:ids
"103"
127.0.0.1:6379> sadd test:teachers aaa bbb ccc ddd eee
(integer) 5
127.0.0.1:6379> scard test:teachers
(integer) 5
127.0.0.1:6379> spop test:teachers
"eee"
127.0.0.1:6379> scard test:teachers
(integer) 4
127.0.0.1:6379> spop test:teachers
"ddd"
127.0.0.1:6379> smembers test:teachers
1) "aaa"
2) "ccc"
3) "bbb"
127.0.0.1:6379> zadd test:students 10 aaa 20 bbb 30 ccc 40 ddd 50 eee
(integer) 5
127.0.0.1:6379> zcard test:students
(integer) 5
127.0.0.1:6379> zscore test:students ccc
"30"
127.0.0.1:6379> zrank test:students ccc
(integer) 2
127.0.0.1:6379> zrange test:students 0 2
1) "aaa"
2) "bbb"
3) "ccc"
127.0.0.1:6379> keys *
1) "test:count"
2) "test:teachers"
3) "test:students"
4) "test:user"
5) "test:ids"
127.0.0.1:6379> keys test*
1) "test:count"
2) "test:teachers"
3) "test:students"
4) "test:user"
5) "test:ids"
127.0.0.1:6379> type test:user
hash
127.0.0.1:6379> exists test:user
(integer) 1
127.0.0.1:6379> del test:user
(integer) 1
127.0.0.1:6379> exists test:user
(integer) 0
127.0.0.1:6379> expire test:student
(error) ERR wrong number of arguments for 'expire' command
127.0.0.1:6379> expire test:students 5
(integer) 1
127.0.0.1:6379> keys *
1) "test:count"
2) "test:teachers"
3) "test:students"
4) "test:ids"
127.0.0.1:6379> keys *
1) "test:count"
2) "test:teachers"
3) "test:ids"
127.0.0.1:6379>
C:\Users\M>
spring整合redis,写好配置类后进行一些简单的测试
注意事务：
事务是redisOperations.multi();和redisOperations.exec();之间的代码部分
package com.nowcoder.community;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.SessionCallback;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.concurrent.TimeUnit;
@RunWith(SpringRunner.class)
@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
public class RedisTests {
@Autowired
private RedisTemplate redisTemplate;
@Test
public void testStrings() {
String redisKey = "test:count";
redisTemplate.opsForValue().set(redisKey,2);
redisTemplate.opsForValue().set(redisKey, 1);
System.out.println(redisTemplate.opsForValue().get(redisKey));
System.out.println(redisTemplate.opsForValue().increment(redisKey));
System.out.println(redisTemplate.opsForValue().decrement(redisKey));
}
@Test
public void testHashes() {
String redisKey = "test:user";
redisTemplate.opsForHash().put(redisKey, "id", 1);
redisTemplate.opsForHash().put(redisKey, "username", "zhangsan");
System.out.println(redisTemplate.opsForHash().get(redisKey, "id"));
System.out.println(redisTemplate.opsForHash().get(redisKey, "username"));
}
@Test
public void testLists() {
String redisKey = "test:ids";
redisTemplate.opsForList().leftPush(redisKey, 101);
redisTemplate.opsForList().leftPush(redisKey, 102);
redisTemplate.opsForList().leftPush(redisKey, 103);
System.out.println(redisTemplate.opsForList().size(redisKey));
System.out.println(redisTemplate.opsForList().index(redisKey, 0));
System.out.println(redisTemplate.opsForList().range(redisKey, 0, 2));
System.out.println(redisTemplate.opsForList().leftPop(redisKey));
System.out.println(redisTemplate.opsForList().leftPop(redisKey));
System.out.println(redisTemplate.opsForList().leftPop(redisKey));
}
@Test
public void testSets() {
String redisKey = "test:teachers";
redisTemplate.opsForSet().add(redisKey, "刘备", "关羽", "张飞", "赵云", "诸葛亮");
System.out.println(redisTemplate.opsForSet().size(redisKey));
System.out.println(redisTemplate.opsForSet().pop(redisKey));
System.out.println(redisTemplate.opsForSet().members(redisKey));
}
@Test
public void testSortedSets() {
String redisKey = "test:students";
redisTemplate.opsForZSet().add(redisKey, "唐僧", 80);
redisTemplate.opsForZSet().add(redisKey, "悟空", 90);
redisTemplate.opsForZSet().add(redisKey, "八戒", 50);
redisTemplate.opsForZSet().add(redisKey, "沙僧", 70);
redisTemplate.opsForZSet().add(redisKey, "白龙马", 60);
System.out.println(redisTemplate.opsForZSet().zCard(redisKey));
System.out.println(redisTemplate.opsForZSet().score(redisKey, "八戒"));
System.out.println(redisTemplate.opsForZSet().reverseRank(redisKey, "八戒"));
System.out.println(redisTemplate.opsForZSet().reverseRange(redisKey, 0, 2));
}
@Test
public void testKeys() {
redisTemplate.delete("test:user");
System.out.println(redisTemplate.hasKey("test:user"));
redisTemplate.expire("test:students", 10, TimeUnit.SECONDS);
}
// 编程式事务
@Test
public void testTransaction() {
Object result = redisTemplate.execute(new SessionCallback() {
@Override
public Object execute(RedisOperations redisOperations) throws DataAccessException {
String redisKey = "text:tx";
// 启用事务
redisOperations.multi();
redisOperations.opsForSet().add(redisKey, "zhangsan");
redisOperations.opsForSet().add(redisKey, "lisi");
redisOperations.opsForSet().add(redisKey, "wangwu");
System.out.println(redisOperations.opsForSet().members(redisKey));
// 提交事务
return redisOperations.exec();
}
});
System.out.println(result);
}
}
