Redis-Redisearch

RediSearch 是一个高性能的全文搜索引擎，它可以作为一个 Redis Module（扩展模块）运行在 Redis 服务器上。

RediSearch

Redis 哈希中多个字段的全文索引
无性能损失的增量索引
文档排名（使用tf-idf，具有可选的用户提供的权重）
场加权
使用 AND、OR 和 NOT 运算符的复杂布尔查询
前缀匹配、模糊匹配和精确短语查询
支持双变音拼音匹配
自动完成建议（带有模糊前缀建议）
多种语言中基于词干的查询扩展（使用Snowball）
支持中文标记化和查询（使用Friso）
数字过滤器和范围
使用Redis 地理空间索引进行地理空间搜索
强大的聚合引擎
支持所有 utf-8 编码文本
检索完整文档、选定字段或仅检索文档 ID
排序结果（例如，按创建日期）

官方文档

Commands

运行环境

docker

1 2	mkdir -p redisearch/data docker run -p 6379:6379 -v $PWD/redisearch/data:/data -d redislabs/redisearch:latest

检查安装

➜  docker-run redis-cli 
127.0.0.1:6379> MODULE LIST
1) 1) "name"
   2) "search"
   3) "ver"
   4) (integer) 20015
127.0.0.1:6379> exit

测试下

127.0.0.1:6379> FT.ADD idx docCn 1.0 LANGUAGE chinese FIELDS txt "Redis支持主从同步。数据可以从主服务器向任意数量的从服务器上同步，从服务器可以是关联其他从服务器的主服务器。这使得Redis可执行单层树复制。从盘可以有意无意的对数据进行写操作。由于完全实现了发布/订阅机制，使得从数据库在任何地方同步树时，可订阅一个频道并接收主服务器完整的消息发布记录。同步对读取操作的可扩展性和数据冗余很有帮助。[8]"
OK
127.0.0.1:6379> FT.SEARCH idx "数据" LANGUAGE chinese HIGHLIGHT SUMMARIZE
1) (integer) 1
2) "docCn"
3) 1) "txt"
   2) "<b>\xe6\x95\xb0\xe6\x8d\xae</b>\xe5... <b>\xe6\x95\xb0\xe6\x8d\xae</b>\xe8\xbf\x9b\xe8\xa1\x8c\xe5\x86\x99\xe6\x93\x8d\xe4\xbd\x9c\xe3\x80\x82\xe7\x94\xb1\xe4\xba\x8e\xe5\xae\x8c\xe5\x85\xa8\xe5\xae\x9e\xe7\x8e\xb0\xe4\xba\x86\xe5\x8f\x91\xe5\xb8\x83... <b>\xe6\x95\xb0\xe6\x8d\xae</b>\xe5\x86\x97\xe4\xbd\x99\xe5\xbe\x88\xe6\x9c\x89\xe5\xb8\xae\xe5\x8a\xa9\xe3\x80\x82[8... "

对中文支持不够好

代码演示

Spring boot 2.6.0
spring-lettucemod 1.8.1
注意这里需要排除commons-pool2

项目依赖


   <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    
<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

        <dependency>
            <groupId>com.redis</groupId>
            <artifactId>spring-lettucemod</artifactId>
            <version>1.8.1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
        </dependency>
</dependencies>

单元测试


@Autowired
StatefulRedisModulesConnection<String, String> connection;

@Autowired
RedisTemplate redisTemplate;

@Test
public void search() {
    Set<String> keys = redisTemplate.keys("*");
    keys.forEach(item -> {
                redisTemplate.delete(item);
                log.info(" keys - > {} ", item);
            }
    );
    String searchIndexName = "doc-idx";
    Gson gson = new GsonBuilder().setPrettyPrinting().create();
    RediSearchCommands<String, String> commands = connection.sync();
    RedisCommands redisCommands = connection.sync();
    List<String> list = commands.list();
    for (String s : list) {
        commands.dropindex(s);
    }
    CreateOptions<String, String> options = CreateOptions.<String, String>builder()
            .on(CreateOptions.DataType.HASH)
            .languageField(Language.CHINESE.getId())
            .prefix(String.format("%s:", DocumentDto.class.getName()))
            .build();
    log.info("{}",gson.toJson(options));
    Field title = Field.text("title").build();
    Field subtitle = Field.text("subtitle").build();
    Field description = Field.text("description").build();
    Field author = Field.text("authors").build();
    commands.create(
            searchIndexName, //
            options, //
            title,
            subtitle,
            description, //
            author
    );
    String key = String.format("%s:%s", DocumentDto.class.getName(), "1");
    Map<String,String> map = new HashMap<>();
    map.put("title","标题");
    map.put("subtitle","副标题");
    map.put("description","描述");
    map.put("authors","作者");
    Boolean result = redisHash.hMSet(key,map);
    log.info(" \n key {} \n data {} result {} ", key,gson.toJson(map),result);
    map = new HashMap<>();
    map.put("title","标题1");
    map.put("subtitle","副标题2");
    map.put("description","描述3");
    map.put("authors","作者4");
    key = String.format("%s:%s", DocumentDto.class.getName(), "2");
    result = redisHash.hMSet(key,map);
    log.info(" \n key {} \n data {} result {} ", key,gson.toJson(map),result);
    List<String> fields = new ArrayList<>();
    fields.add("title");
    fields.add("subtitle");
    fields.add("description");
    fields.add("authors");
    SearchOptions.Summarize summarize = new SearchOptions.Summarize();
    summarize.setFields(fields);
    SearchOptions searchOptions = SearchOptions.builder()
            .language(Language.CHINESE)
            .limit(SearchOptions.Limit.of(0,10))
            .summarize(summarize)
            .build();
    log.info(" searchOptions {}",gson.toJson(searchOptions));
    SearchResults<String, String> results = commands.search(searchIndexName, "标", searchOptions);
    log.info("{}", gson.toJson(results));
}

Console

key cn.z201.learning.redis.operating.DocumentDto:1 
 data {
  "subtitle": "副标题",
  "description": "描述",
  "title": "标题",
  "authors": "作者"
} result true 

 key cn.z201.learning.redis.operating.DocumentDto:2 
 data {
  "subtitle": "副标题2",
  "description": "描述3",
  "title": "标题1",
  "authors": "作者4"
} result true 

// 结果
[
  {
    "title": "标题1... ",
    "subtitle": "�",
    "description": "�",
    "authors": "�"
  },
  {
    "title": "标题... ",
    "subtitle": "�",
    "description": "�",
    "authors": "�"
  }
]

结果很不友好，对中文支持一般般。