After understanding the five storage types, some friends will definitely say that I can store everything with string<String, Object>. Collection objects can be stored. Yes, they can all be stored. However, such as string type storage objects, It will be serialized to redis and then deserialized to get the object, adding unnecessary overhead. .
- String: store a simple string, kv form
- list:: store collection data
- hash: storage object
- set: non-repeated elements
- zSet: Data that is not repeated and ordered (sorted according to the score of the element)
// String 字符串 普通的k v
ValueOperations<String, Object> string = redisTemplate.opsForValue();
string.set("string:one", "dugt is handsome"); // set
string.get("string:one"); // get
string.set("string:number", 1);
string.increment("string:number"); // +1 也可以自己设置加的数量
string.decrement("string:number"); // -1
string.setIfAbsent("string:ifAbsent", "hello"); // 如果不存在 则设置 返回true 存在返回false 不做处理
string.getAndSet("string:ifAbsent", "hello too"); // 获取并设置 如不存在返回null
// list 存储集合
ListOperations<String, Object> list = redisTemplate.opsForList();
list.leftPush("list:one", "dugt"); // 左边添加
list.rightPush("list:one", "dugt2"); // 右边添加
list.range("list:one", 0, -1); // 根据下标获取集合的元素 0~ -1 全部元素
list.leftPop("list:one"); // 弹出最左边元素，集合中会删除该元素
list.rightPop("list:one"); // 弹出最右边元素，集合中会删除该元素
list.leftPushAll("list:list", Arrays.asList(-1, 2, true)); // 从右边添加多个元素
list.size("list:list"); // 集合大小
// hash 存储对象
HashOperations<String, Object, Object> hash = redisTemplate.opsForHash();
hash.put("hash:one", "name", "dugt"); //添加对象
hash.put("hash:one", "age", 22);
hash.put("hash:one", "address", "潍坊");
hash.get("hash:one", "name"); // get
hash.delete("hash:one", "age") // del
hash.entries("hash:one"); // 获取对象
HashMap<String, Object> map = new HashMap<>(4);
map.put("du", 22);
map.put("address", "潍坊");
hash.putAll("hash:all", map); // 存储map
hash.hasKey("hash:one", "test"); // key对应的 map对象key是否存在
hash.keys("hash:one"); // 获取所有 map的key
hash.values("hash:one"); // 获取所有 map的value
// set 不重复的集合
SetOperations<String, Object> set = redisTemplate.opsForSet();
set.add("set:one", -1, 0, 2); // add
set.members("set:one"); // 获取元素
set.remove("set:one", 2); // 删除
// zSet 不重复且有序的集合 根据元素的score 分数排序
ZSetOperations<String, Object> zSet = redisTemplate.opsForZSet();
zSet.add("zSet:one", "hello", 1); // add 按元素的分数排序 分数小的在前
zSet.add("zSet:one", "name", 2);
zSet.range("zSet:one", 0, -1); // 获取元素
zSet.incrementScore("zSet:one", "hello", 5); // 给集合元素增加分数
zSet.score("zSet:one","hello"); // 获取分数
zSet.rank("zSet:one","hello"); // 获取名次
zSet.rangeByScore("zSet:one", 3, 10); // 根据分数区间获取元素Share a redis hash putAll an object tool class
@Lazy
@Component
public class RedisUtils {
@Autowired
private RedisTemplate<String, Object> redisTemplate;
@SneakyThrows
public void hashPutAllObject(String key, Object object) {
Class aClass = object.getClass();
Field[] fields = aClass.getDeclaredFields();
final int mapInitCount = (int) (fields.length / 0.75F + 1F);
HashMap<String, Object> map = new HashMap<>(mapInitCount);
for (Field field : fields) {
field.setAccessible(true);
map.put(field.getName(), field.get(object));
}
redisTemplate.opsForHash().putAll(key, map);
}
}
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