Redis GEO combat

sequence

This paper mainly studies the use of Redis GEO

Relevant command

geoadd

Time order log N.

Geoadd cityGeo 116.405285 39.904989"Beijing"Geoadd cityGeo 121.472644 31.231706"Shanghai"
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• Add latitude and longitude information

geopos

Time order log N.

Geopos cityGeo Beijing 1) 1)"116.40528291463851929"
   2) "39.9049884229125027"
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• Query the latitude and longitude of a specified key. Multiple keys can be specified and returned in batches

geodist

Time order log N.

127.0.0.1:6379> Geodist cityGeo"1067597.9668"127.0.0.1:6379> Geodist cityGeo Beijing Shanghai km"1067.5980"
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• Returns the distance between two places. You can specify units such as meters m, kilometers km, miles mi, or feet ft

georadius

The time complexity is O(N+log(M)), where N is the number of elements within the specified radius and M is the number to be returned

Georadius cityGeo 116.405285 39.904989 100 km WITHDIST WITHCOORD ASC COUNT 5Copy the code

• Returns an element whose radius does not exceed the specified distance, based on the given latitude and longitude
• You can specify WITHDIST to return the distance, WITHCOORD to return latitude and longitude, and WITHHASH to return the geohash value
• You can specify ASC or DESC to sort by distance
• You can specify COUNT to limit the number of records returned

georadiusbymember

The time complexity is O(log(N)+M), where N is the number of elements within the specified radius and M is the number to be returned

Georadiusbymember cityGeo Beijing 100 km WITHDIST WITHCOORD ASC COUNT 5Copy the code

• Queries the location within the specified radius based on the specified location
• You can specify WITHDIST to return the distance, WITHCOORD to return latitude and longitude, and WITHHASH to return the geohash value
• You can specify ASC or DESC to sort by distance
• You can specify COUNT to limit the number of records returned

geohash

The time to find a location is order log of N.

127.0.0.1:6379> GeoHash cityGeo Beijing 1)"wx4g0b7xrt0"
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• The geohash value is returned

RedisTemplate GEO use example

    @Test
    public void testAdd(){Long addedNum = redistemplate.opsforgeo ().add(cityGeoKey,new Point(116.405285,39.904989),"Beijing");
        System.out.println(addedNum);
    }

    @Test
    public void testGeoGet(){
        List<Point> points = redisTemplate.opsForGeo().position(cityGeoKey,"Beijing"."Shanghai"."Shenzhen");
        System.out.println(points);
    }

    @Test
    public void testDist(){
        Distance distance = redisTemplate.opsForGeo()
                .distance(cityGeoKey,"Beijing"."Shanghai", RedisGeoCommands.DistanceUnit.KILOMETERS);
        System.out.println(distance);
    }

    @Test
    public void testNearByXY() {/ / longitude, latitude Circle Circle = new Circle (116.405285, 39.904989, the Metrics. KILOMETERS. GetMultiplier ()); RedisGeoCommands.GeoRadiusCommandArgs args = RedisGeoCommands.GeoRadiusCommandArgs.newGeoRadiusArgs().includeDistance().includeCoordinates().sortAscending().limit(5) ; GeoResults<RedisGeoCommands.GeoLocation<String>> results = redisTemplate.opsForGeo() .radius(cityGeoKey,circle,args); System.out.println(results); } @Test public voidtestNearByPlace(){ Distance distance = new Distance(5,Metrics.KILOMETERS); RedisGeoCommands.GeoRadiusCommandArgs args = RedisGeoCommands.GeoRadiusCommandArgs.newGeoRadiusArgs().includeDistance().includeCoordinates().sortAscending().limit(5) ; GeoResults<RedisGeoCommands.GeoLocation<String>> results = redisTemplate.opsForGeo() .radius(cityGeoKey,"Beijing",distance,args);
        System.out.println(results);
    }

    @Test
    public void testGeoHash(){
        List<String> results = redisTemplate.opsForGeo()
                .hash(cityGeoKey,"Beijing"."Shanghai"."Shenzhen");
        System.out.println(results);
    }
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• The operations of geoadd, geopOS, geodist, Georadius, Georadiusbymember and geohash using RedisTemplate are respectively shown above
• The x axis is longitude longitude and the y axis is latitude latitude

summary

Redis provides rich operations for GEO, and RedisTemplate also encapsulates corresponding apis, making it very convenient to use.

doc

• geo
• geoadd
• geopos
• geodist
• georadius
• georadiusbymember
• geohash
• Mongo’s Geo query