Redis
介绍:
Redis是一个基于内存的key-value结构数据库(MySQL是通过数据文件方式存储在磁盘上,数据结构是二维表)
特点:
更改配置文件:
使用密码:
redis默认是不需要密码的,如果要设置密码,需要:打开redis.windows.conf,搜索pass (加一个空格),找到这个部分:# requirepass foobared,foobared部分改为你想设置的密码,然后去掉注释#,就可以了。
使用:
启动服务
在当前下载redis的文件路径下打开cmd,输入redis-server.exe redis.windows.conf,回车
启动服务后,可以选择两种方式进行连接
连接:
cmd方式:
在这个文件路径下再打开一个cmd,注意上面打开那个cmd不要关,然后输入redis-cli.exe,这里返回127.0.0.1:6379就说明连上了
图形界面方式:
下载图形化界面Another Redis Desktop Manager,新建连接,输入配置信息,进行连接
常用数据类型:
各种数据类型的特点:
常用命令:
字符串操作命令:
哈希操作命令:
列表操作命令:
集合操作命令:
有序集合操作命令:
通用命令:
操作Redis:
想要了解Redis的基础知识及使用方法可以参考作者另一边文章《Java_中间件——Redis》
Redis的Java客户端:
下面我们使用Spring Data Redis来操作Redis
Spring Data Redis使用方式:
配置类RedisTemplate:
@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();
//设置redis连接工厂对象
redisTemplate.setConnectionFactory(redisConnectionFactory);
//设置redis key的序列化器
redisTemplate.setKeySerializer(new StringRedisSerializer());
return redisTemplate;
}
}
代码演示:
@Autowired
private RedisTemplate redisTemplate;
@Test
public void testRedisTemplate() {
System.out.println(redisTemplate);
//操作字符串
ValueOperations valueOperations = redisTemplate.opsForValue();
//操作Hash
HashOperations hashOperations = redisTemplate.opsForHash();
//操作List
ListOperations listOperations = redisTemplate.opsForList();
//操作set
SetOperations setOperations = redisTemplate.opsForSet();
//操作有序集合
ZSetOperations zSetOperations = redisTemplate.opsForZSet();
}
/**
* 操作字符串类型的数据
*/
@Test
public void testStirng() {
// set get setex setnx
redisTemplate.opsForValue().set("city","北京");
String city = (String) redisTemplate.opsForValue().get("city");
System.out.println(city);
redisTemplate.opsForValue().set("code","6562",60, TimeUnit.SECONDS);
redisTemplate.opsForValue().setIfAbsent("lock","1");
redisTemplate.opsForValue().setIfAbsent("lock","2");
}
/**
* 操作哈希类型的数据
*/
@Test
public void testHash() {
//hset hget hdel hkeys hvals
HashOperations hashOperations = redisTemplate.opsForHash();
hashOperations.put("100","name","xiaobai");
hashOperations.put("100","age","20");
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
*/
@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");
setOperations.add("set2","b","c","d");
Set set1 = setOperations.members("set1");
System.out.println(set1);
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",11);
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");
}