Spring Redis排序键
我在Redis(Spring Data Redis)中有以下键,
localhost>Keys *"1+ { \"_id":"1", \"Name\" : \"C5796\" , \"Site\" : \"DRG1\"}"
"2+ { \"_id":"2", \"Name\" : \"CX1XE\" , \"Site\" : \"DG1\"}"
"3+ { \"_id":"3", \"Name\" : \"C553\" , \"Site\" : \"DG1\"}"
如果要根据 进行排序,该怎么做Spring Redis
?
List<Object> keys = redistemplate.sort(SortQueryBuilder.sort("Customer").build());
和,
SortQuery<String> sort = SortQueryBuilder.sort(key).noSort().get(field).build(); List<?> keys = redistemplate.boundHashOps(key).getOperations().sort(sort);
不工作。
回答:
Redis Sort旨在对List / Set /
Zset中的字段进行排序,但是该方法可用于根据所需的指定指标对多键进行排序。我们可以使用“
sort”按指定字段对多个hset键进行排序,但是关于hset键的模式存在一些限制。
例如,如果hset键的模式为“ hash {i}”(i为整数),则在这种情况下我们可以对其进行排序。
127.0.0.1:6379> keys hash*1) "hash3"
2) "hash2"
3) "hash1"
看一下hash1的内容:
127.0.0.1:6379> hgetall hash11) "id"
2) "24"
3) "name"
4) "kobe"
每个哈希键包含两个字段:“ id”,“ name”。如果我们要按ID对这些hset键进行排序。我们应该做什么 ?
首先,添加一个名为“ myset”的设置键。“ myset”是包含成员{“ 1”,“ 2”,“ 3”}的设置键。
127.0.0.1:6379> smembers myset1) "1"
2) "2"
3) "3"
然后运行以下命令:
127.0.0.1:6379> SORT myset BY hash*->id GET hash*->id GET hash*->name1) "3"
2) "wade"
3) "24"
4) "kobe"
5) "30"
6) "curry"
尤里卡(Eureka),按ID对哈希{1-3}进行排序。
public static String getRandomStr() { return String.valueOf(new Random().nextInt(100));
}
public static void redisTemplateSort(RedisTemplate redisTemplate) {
String sortKey = "sortKey";
StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
redisTemplate.setKeySerializer(stringRedisSerializer);
redisTemplate.setValueSerializer(stringRedisSerializer);
redisTemplate.setHashKeySerializer(stringRedisSerializer);
redisTemplate.setHashValueSerializer(stringRedisSerializer);
redisTemplate.delete(sortKey);
if (!redisTemplate.hasKey(sortKey)) {
for (int i = 0; i < 10; i++) {
redisTemplate.boundSetOps(sortKey).add(String.valueOf(i));
String hashKey = "hash" + i,
strId = String.valueOf(i),
strName = getRandomStr(),
strSite = getRandomStr();
redisTemplate.boundHashOps(hashKey).put("_id", strId);
redisTemplate.boundHashOps(hashKey).put("Name", strName);
redisTemplate.boundHashOps(hashKey).put("Site", strSite);
System.out.printf("%s : {\"_id\": %s, \"Name\": %s, \"Site\", %s}\n",
hashKey, strId, strName, strSite);
}
}
SortQuery<String> sortQuery = SortQueryBuilder.sort(sortKey).by("hash*->Name")
.get("hash*->_id").get("hash*->Name").get("hash*->Site").build();
List<String> sortRslt = redisTemplate.sort(sortQuery);
for (int i = 0; i < sortRslt.size(); ) {
System.out.printf("{\"_id\": %s, \"Name\": %s, \"Site\", %s}\n", sortRslt.get(i+2), sortRslt.get(i+1), sortRslt.get(i));
i += 3;
}
}
运行结果redisTemplateSort(redisTemplate)
(按代码中的名称排序):
hash0 : {"_id": 0, "Name": 59, "Site", 60}hash1 : {"_id": 1, "Name": 37, "Site", 57}
hash2 : {"_id": 2, "Name": 6, "Site", 40}
hash3 : {"_id": 3, "Name": 91, "Site", 58}
hash4 : {"_id": 4, "Name": 39, "Site", 32}
hash5 : {"_id": 5, "Name": 27, "Site", 82}
hash6 : {"_id": 6, "Name": 43, "Site", 10}
hash7 : {"_id": 7, "Name": 17, "Site", 55}
hash8 : {"_id": 8, "Name": 14, "Site", 91}
hash9 : {"_id": 9, "Name": 39, "Site", 91}
{"_id": 40, "Name": 6, "Site", 2}
{"_id": 91, "Name": 14, "Site", 8}
{"_id": 55, "Name": 17, "Site", 7}
{"_id": 82, "Name": 27, "Site", 5}
{"_id": 57, "Name": 37, "Site", 1}
{"_id": 32, "Name": 39, "Site", 4}
{"_id": 91, "Name": 39, "Site", 9}
{"_id": 10, "Name": 43, "Site", 6}
{"_id": 60, "Name": 59, "Site", 0}
{"_id": 58, "Name": 91, "Site", 3}
以上是 Spring Redis排序键 的全部内容, 来源链接: utcz.com/qa/425680.html