RedisStack之RedisSearch使用

安装RedisStack

这里我们选择通过Docker来安装， 具体细节可以参考： Run Redis Stack on Docker

docker run -d --name redis-stack -p 6379:6379 -p 8001:8001 redis/redis-stack:latest

RedisStack中自动就包含了RedisSearch模块

如果使用的是Redis，Redis版本需要在v6.x或以上，并且需要安装和开启RediSearch（v2.2 or later）模块。

RedisJson模块的使用和RedisSearch同理

连接RedisStack

可以通过redis-cli客户端来连接， 如果发现redis-cli命令不存在，可以选择本地安装一下或者直接进入上面运行的容器内部使用redis-cli命令

// 进入容器里面
docker exec -it 28c3e594f5aa /bin/sh
// 连接redis
#redis-cli

创建一个 Index

127.0.0.1:6379> FT.CREATE myIdx ON HASH PREFIX 1 doc: SCHEMA title TEXT WEIGHT 5.0 body TEXT url TEXT

通过上面的命令，创建了一个支持hash数据类型的索引，同时需要满足key前缀为 doc: 。支持索引的字段说明如下：

新增数据

127.0.0.1:6379> HSET doc:1 title "hello world" body "lorem ipsum" url "http://redis.io"

满足索引key前缀定义的数据，在新增后都会自动加入到对应的索引中

使用索引

127.0.0.1:6379> FT.SEARCH myIdx "hello world" LIMIT 0 10
1) (integer) 1
2) "doc:1"
3) 1) "title"
   2) "hello world"
   3) "body"
   4) "lorem ipsum"
   5) "url"
   6) "http://redis.io"

支持JSON数据的索引

这个就需要上面提到的RedisJson模块的支持了。

简单演示如下：创建一个索引，字段包含：name， description，price和embedding

127.0.0.1:6379> FT.CREATE itemIdx ON JSON PREFIX 1 item: SCHEMA $.name AS name TEXT $.description as description TEXT $.price AS price NUMERIC $.embedding AS embedding VECTOR FLAT 6 DIM 4 DISTANCE_METRIC L2 TYPE FLOAT32

JSON数据格式如下：

示例数据1：

{
  "name": "Noise-cancelling Bluetooth headphones",
  "description": "Wireless Bluetooth headphones with noise-cancelling technology",
  "connection": {
    "wireless": true,
    "type": "Bluetooth"
  },
  "price": 99.98,
  "stock": 25,
  "colors": [
    "black",
    "silver"
  ],
  "embedding": [0.87, -0.15, 0.55, 0.03]
}

示例数据2：

{
  "name": "Wireless earbuds",
  "description": "Wireless Bluetooth in-ear headphones",
  "connection": {
    "wireless": true,
    "type": "Bluetooth"
  },
  "price": 64.99,
  "stock": 17,
  "colors": [
    "black",
    "white"
  ],
  "embedding": [-0.7, -0.51, 0.88, 0.14]
}

通过RedisJson写命令，比如JSON.SET 和JSON.ARRAPPEND 来创建和修改JSON数据

写入示例数据到数据库中：

127.0.0.1:6379> JSON.SET item:1 $ '{"name":"Noise-cancelling Bluetooth headphones","description":"Wireless Bluetooth headphones with noise-cancelling technology","connection":{"wireless":true,"type":"Bluetooth"},"price":99.98,"stock":25,"colors":["black","silver"],"embedding":[0.87,-0.15,0.55,0.03]}'
"OK"
127.0.0.1:6379> JSON.SET item:2 $ '{"name":"Wireless earbuds","description":"Wireless Bluetooth in-ear headphones","connection":{"wireless":true,"type":"Bluetooth"},"price":64.99,"stock":17,"colors":["black","white"],"embedding":[-0.7,-0.51,0.88,0.14]}'
"OK"

更多内容: Index and search JSON documents