Redis常用方法实例

傷城~ 2022-06-06 02:20 178阅读 0赞

** /\*  
  \* 常用实例  
  \* 字符操作：run1 -> run7  
  \* Map操作：run8  
  \* List操作：run9  
  \* Set操作：run10  
  \* 列表排序：run11  
  \*/**  
 public static void run1()\{ **//存取**  
     jedis.set("key" , "茶杯");  
     System.out.println(jedis.get("key"));  
 \}  
   
 public static void run2()\{ **//覆盖**  
     jedis.set("key" , "茶杯");  
     jedis.set("key" , "玻璃杯");  
     System.out.println(jedis.get("key"));  
 \}  
   
 public static void run3()\{ **//删除**  
     jedis.set("key" , "茶杯");  
     jedis.del("key");  
     System.out.println(jedis.get("key"));  
 \}  
   
 public static void run4()\{ **//拼加**  
     jedis.set("key" , "茶杯");  
     jedis.append("key", "沏好茶");  
     System.out.println(jedis.get("key"));  
 \}  
   
 public static void run5()\{ **//加1操作**  
     jedis.set("key" , "1");  
     //jredis.set("key" , "茶杯");//ERR value is not an integer or out of range  
     jedis.incr("key");  
     System.out.println(jedis.get("key"));  
 \}  
   
 public static void run6()\{ **//多值操作**  
     jedis.mset("key1" , "茶杯", "key2", "沏好茶");  
     System.out.println(jedis.get("key1") + jedis.get("key2"));  
 \}  
   
 public static void run7()\{ **//是否存在key为"key"的记录**  
     jedis.set("key" , "茶杯");  
     System.out.println(jedis.get("key"));  
     System.out.println(jedis.exists("key"));  
 \}  
   
 **/\*  
  \* Map操作的方法都是h开头：  
  \* hmset：往redis中存map  
  \* hmget：往redis中存map中的key对应的值  
  \* hlen：map中元素的个数  
  \* hkeys：map中key的集合  
  \* hvals：map中value的集合  
  \*/**  
 public static void run8()\{//存取map:hmset,hmget  
  Map map = new HashMap();  
  map.put("key1", "茶杯");  
  map.put("key2", "沏好茶");  
  map.put("key3", "润香");  
  jedis.hmset("map", map);  
  List rsmap = jedis.hmget("map", "key1", "key2", "key3", "key4");  
  System.out.println(rsmap);  
    
  jedis.hdel("map", "key2");//删除map中的某个键值 jredis.hdel("map", "key2", "key1");  
  System.out.println(jedis.hmget("map", "key1", "key2", "key3", "key4"));//因为删除了，所以返回的是null  
  System.out.println(jedis.hlen("map"));//map的键中存放的值的个数  
  System.out.println(jedis.hkeys("map"));//map对象中的所有key  
  System.out.println(jedis.hvals("map"));//map对象中的所有value  
    
  Object map1\[\] = jedis.hkeys("map").toArray();  
  for (Object key : map1) \{  
   System.out.println(key + ":" + jedis.hmget("map", key.toString()));  
  \}  
 \}

** /\*  
\* List操作  
\* lpush：在key对应list的头部添加字符串元素**

**\* lrange：返回存储在key列表的特定元素。偏移量开始和停止是从0开始的索引，0是第一元素(该列表的头部)，1是列表的下一个元素。这些偏移量也可以是表示开始在列表的末尾偏移负数。例如，-1是该列表的最后一个元素，-2倒数第二个**

**\* rpush：在key对应list的尾部添加字符串元素**

**\* rpop：移除并返回列表 key 的尾元素**

**\* lpop：移除并返回列表 key 的头元素**

**\* 登陆:  
\* ./redis-cli -h IP地址 -a 密码 -p 6379  
\* 查看所有:  
\* keys \*  
\* 查看List中有多少条数据:  
\* llen key -> 返回key对应list的长度  
\*/**  
public static void run9()\{  
jedis.del("list");  
System.out.println(jedis.lrange("list", 0, -1));//从List中往外出取值  
jedis.lpush("list", "茶杯");  
jedis.lpush("list", "沏好茶");  
jedis.lpush("list", "润香");  
System.out.println(jedis.lrange("list", 0, -1));//从List中往外出取值  
jedis.del("list");  
jedis.rpush("list", "茶杯");  
jedis.rpush("list", "沏好茶");  
jedis.rpush("list", "润香");  
System.out.println(jedis.lrange("list", 0, -1));//从List中往外出取值  
System.out.println(jedis.rpop("list"));//移除并返回列表 key 的尾元素  
System.out.println(jedis.lrange("list", 0, -1));//从List中往外出取值  
\}

**1 . linsert -> 在key对应list的特定位置之前或之后添加字符串元素：**

redis 127.0.0.1:6379> rpush mylist "one"  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "two"  
(integer) 2  
redis 127.0.0.1:6379> linsert mylist before "two" "there"  
(integer) 3  
redis 127.0.0.1:6379> lrange mylist 0 -1  
1) "one"  
2) "there"  
3) "two"  
redis 127.0.0.1:6379>

**2 . lset -> 设置list中指定下标的元素值(下标从0开始)：**

redis 127.0.0.1:6379> del mylist  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "one"  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "two"  
(integer) 2  
redis 127.0.0.1:6379> rpush mylist "three"  
(integer) 3  
redis 127.0.0.1:6379> lset mylist 0 "1"  
OK  
redis 127.0.0.1:6379> lset mylist -2 "2"  
OK  
redis 127.0.0.1:6379> lrange mylist 0 -1  
1) "1"  
2) "2"  
3) "three"  
redis 127.0.0.1:6379>

**3 . lrem -> 从key对应list中删除count个和value相同的元素：**

**① count>0时，按从头到尾的顺序删除**

redis 127.0.0.1:6379> del mylist  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "one"  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "two"  
(integer) 2  
redis 127.0.0.1:6379> rpush mylist "three"  
(integer) 3  
redis 127.0.0.1:6379> rpush mylist "two"  
(integer) 4  
redis 127.0.0.1:6379> rpush mylist "two"  
(integer) 5  
redis 127.0.0.1:6379> lrem mylist 2 "two"  
(integer) 2  
redis 127.0.0.1:6379> lrange mylist 0 -1  
1) "one"  
2) "three"  
3) "two"  
redis 127.0.0.1:6379>

**② count<0时，按从尾到头的顺序删除**  
redis 127.0.0.1:6379> del mylist  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "one"  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "two"  
(integer) 2  
redis 127.0.0.1:6379> rpush mylist "three"  
(integer) 3  
redis 127.0.0.1:6379> rpush mylist "two"  
(integer) 4  
redis 127.0.0.1:6379> rpush mylist "two"  
(integer) 5  
redis 127.0.0.1:6379> lrem mylist -2 "two"  
(integer) 2  
redis 127.0.0.1:6379> lrange mylist 0 -1  
1) "one"  
2) "two"  
3) "three"  
redis 127.0.0.1:6379>

**③ count=0时，删除全部**  
redis 127.0.0.1:6379> del mylist  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "one"  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "two"  
(integer) 2  
redis 127.0.0.1:6379> rpush mylist "three"  
(integer) 3  
redis 127.0.0.1:6379> rpush mylist "two"  
(integer) 4  
redis 127.0.0.1:6379> rpush mylist "two"  
(integer) 5  
redis 127.0.0.1:6379> lrem mylist 0 "two"  
(integer) 3  
redis 127.0.0.1:6379> lrange mylist 0 -1  
1) "one"  
2) "three"  
redis 127.0.0.1:6379>

**4 . ltrim -> 保留指定key 的值范围内的数据：**

redis 127.0.0.1:6379> del mylist  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "0"  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "1"  
(integer) 2  
redis 127.0.0.1:6379> rpush mylist "2"  
(integer) 3  
redis 127.0.0.1:6379> rpush mylist "3"  
(integer) 4  
redis 127.0.0.1:6379> rpush mylist "4"  
(integer) 5  
redis 127.0.0.1:6379> rpush mylist "5"  
(integer) 6  
redis 127.0.0.1:6379> ltrim mylist 2 -1  
OK  
redis 127.0.0.1:6379> lrange mylist 0 -1  
1) "2"  
2) "3"  
3) "4"  
4) "5"  
redis 127.0.0.1:6379>

**5. rpoplpush -> 从第一个list的尾部移除元素并添加到第二个list的头部,最后返回被移除的元素值，整个操作是原子的.如果第一个list是空或者不存在返回nil：**

redis 127.0.0.1:6379> del mylist  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "0"  
(integer) 1  
redis 127.0.0.1:6379> rpush mylist "1"  
(integer) 2  
redis 127.0.0.1:6379> rpush mylist "2"  
(integer) 3  
redis 127.0.0.1:6379> lrange mylist 0 -1  
1) "0"  
2) "1"  
3) "2"  
redis 127.0.0.1:6379> rpoplpush mylist mylist01  
"2"  
redis 127.0.0.1:6379> lrange mylist 0 -1  
1) "0"  
2) "1"  
redis 127.0.0.1:6379> lrange mylist01 0 -1  
1) "2"  
redis 127.0.0.1:6379>

**6. lindex -> 返回名称为key的list中index位置的元素：**

redis 127.0.0.1:6379> lrange mylist 0 -1  
1) "0"  
2) "1"  
redis 127.0.0.1:6379> lindex mylist 0  
"0"  
redis 127.0.0.1:6379> lindex mylist 1  
"1"  
redis 127.0.0.1:6379> lindex mylist 2  
(nil)  
redis 127.0.0.1:6379>

**/\*  
  \*set操作  
  \* sadd往集合里加值  
  \* srem从集合众删值  
  \* smembers获取所有的值  
  \* sismember判断是否为集的元素  
  \* srandmember随机取值  
  \* scard集合元素的个数  
  \*/**  
 public static void run10()\{  
  jedis.del("set");  
  jedis.sadd("set", "茶杯");  
  jedis.sadd("set", "沏好茶");  
  jedis.sadd("set", "润香");  
  jedis.sadd("set", "删除");  
  jedis.srem("set", "删除");  
  System.out.println(jedis.smembers("set"));  
  System.out.println(jedis.sismember("set", "删除"));  
  System.out.println(jedis.srandmember("set"));  
  System.out.println(jedis.scard("set"));  
 \}  
   
 **/\*  
  \* 列表排序  
  \*/**  
 public static void run11()\{  
  jedis.del("list");  
  jedis.rpush("list", "茶杯");  
  jedis.lpush("list", "沏好茶");  
  jedis.lpush("list", "润香");  
  System.out.println("取出所有值：" + jedis.lrange("list", 0, -1));//从List中往外出取值  
    
  // 排序   
        /\*  
         \* list中存字符串时必须指定参数为alpha，如果不使用SortingParams，而是直接使用sort("list")，  
         \* 会出现"ERR One or more scores can't be converted into double"  
         \*/  
        SortingParams sortingParameters = new SortingParams();  
        sortingParameters.alpha();  
        System.out.println("jredis.sort(\\"list\\",sortingParameters)=" + jedis.sort("list",sortingParameters));   
        // 修改列表中单个值   
        jedis.lset("list", 0, "hello list!");   
        // 获取列表指定下标的值   
        System.out.println("jredis.lindex(\\"list\\", 0)=" + jedis.lindex("list", 0));   
        // 删除列表指定下标的值   
        //System.out.println(jredis.lrem("list", 0, "hello list"));   
        System.out.println(jedis.lrem("list", 0, "hello list!"));  
        System.out.println("取出所有值：" + jedis.lrange("list", 0, -1));//从List中往外出取值  
        // 删除区间以外的数据   
        System.out.println("jredis.ltrim(\\"list\\", 0, 0)=" + jedis.ltrim("list", 0, 0));   
        System.out.println("取出所有值：" + jedis.lrange("list", 0, -1));//从List中往外出取值  
 \}

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