9.Redis 的特殊数据类型之一：geopatial

redis 的 Geo 在 Redis3.2 版本就推出了！这个功能可以推算地理位置的信息，两地之间的距离，方圆几里的人！

只有六个命令：

geoadd添加地理位置

# geoadd key longitude latitude member
127.0.0.1:6379> geoadd city 116.4 39.9 BeiJing
(integer) 1
127.0.0.1:6379> geoadd city 121.4 31.2 ShangHai
(integer) 1
127.0.0.1:6379> 

geopos获得当前定位

获得当前定位，一定是一个坐标值

# geopos key member
127.0.0.1:6379> geopos city BeiJing
1) 1) "116.39999896287918091"
   2) "39.90000009167092543"
127.0.0.1:6379> geopos city BeiJing ShangHai
1) 1) "116.39999896287918091"
   2) "39.90000009167092543"
2) 1) "121.40000134706497192"
   2) "31.20000061483705878"
127.0.0.1:6379> 

geodist 两地之间的距离

# geodist key member1 member2  m|km|mi|ft
# 默认单位为m
127.0.0.1:6379> geodist city BeiJing ShangHai
"1067742.3622"
127.0.0.1:6379> geodist city BeiJing ShangHai km
"1067.7424"
127.0.0.1:6379> 

georadius 找出半径内的元素

以一个经纬度为中心，redius半径内的所有元素

我附近的人

127.0.0.1:6379> georadius city 110 30 1000 km
(empty array)

127.0.0.1:6379> georadius city 110 30 5000 km
1) "ShangHai"
2) "BeiJing"

127.0.0.1:6379> georadius city 110 30 5000 km withdist
1) 1) "ShangHai"
   2) "1099.0298"
2) 1) "BeiJing"
   2) "1245.2858"
   
127.0.0.1:6379> georadius city 110 30 5000 km withcoord
1) 1) "ShangHai"
   2) 1) "121.40000134706497192"
      2) "31.20000061483705878"
2) 1) "BeiJing"
   2) 1) "116.39999896287918091"
      2) "39.90000009167092543"
      
127.0.0.1:6379> georadius city 110 30 5000 km withcoord withdist count 1
1) 1) "ShangHai"
   2) "1099.0298"
   3) 1) "121.40000134706497192"
      2) "31.20000061483705878"
      
127.0.0.1:6379> georadius city 110 30 5000 km withcoord withdist count 2
1) 1) "ShangHai"
   2) "1099.0298"
   3) 1) "121.40000134706497192"
      2) "31.20000061483705878"
2) 1) "BeiJing"
   2) "1245.2858"
   3) 1) "116.39999896287918091"
      2) "39.90000009167092543"
127.0.0.1:6379> 

georadiusbymember

以一个元素为中心，找出对应半径内的元素

127.0.0.1:6379> clear
127.0.0.1:6379> georadiusbymember city ShangHai 5000 km
1) "ShangHai"
2) "BeiJing"

127.0.0.1:6379> georadiusbymember city ShangHai 5000 km withdist
1) 1) "ShangHai"
   2) "0.0000"
2) 1) "BeiJing"
   2) "1067.7424"
   
127.0.0.1:6379> georadiusbymember city ShangHai 5000 km withcoord withdist
1) 1) "ShangHai"
   2) "0.0000"
   3) 1) "121.40000134706497192"
      2) "31.20000061483705878"
2) 1) "BeiJing"
   2) "1067.7424"
   3) 1) "116.39999896287918091"
      2) "39.90000009167092543"
      
127.0.0.1:6379> georadiusbymember city ShangHai 5000 km withcoord withdist count 1
1) 1) "ShangHai"
   2) "0.0000"
   3) 1) "121.40000134706497192"
      2) "31.20000061483705878"
      
127.0.0.1:6379> georadiusbymember city ShangHai 5000 km withcoord withdist count 2
1) 1) "ShangHai"
   2) "0.0000"
   3) 1) "121.40000134706497192"
      2) "31.20000061483705878"
2) 1) "BeiJing"
   2) "1067.7424"
   3) 1) "116.39999896287918091"
      2) "39.90000009167092543"
127.0.0.1:6379> 

geo 的底层是 zset

``geo 的底层是 zset，因此可以用 zset 的命令操作 geo``
127.0.0.1:6379> clear

127.0.0.1:6379> zrange city 0 -1
1) "ShangHai"
2) "BeiJing"

127.0.0.1:6379> zrem city ShangHai
(integer) 1

127.0.0.1:6379> zrange city 0 -1
1) "BeiJing"
127.0.0.1:6379>