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Spring AI pgvector向量搜索实战

Spring AI pgvector向量搜索实战

Spring AI + pgvector:用PostgreSQL实现向量搜索

向量数据库这两年很火,Milvus、Pinecone、Weaviate 各有各的生态。但如果你已经在用 PostgreSQL,pgvector 扩展可以让你零额外运维成本获得向量搜索能力——而且 Spring AI 提供了开箱即用的集成。

环境准备

用 Docker 启动带 pgvector 的 PostgreSQL:

dockerrun-d--namepgvector\
-p5432:5432\
-ePOSTGRES_USER=postgres\
-ePOSTGRES_PASSWORD=postgres\
pgvector/pgvector:pg17

镜像 pgvector/pgvector 已内置 vector 扩展,无需手动 CREATE EXTENSION。Spring AI 会在启动时自动初始化所需的表结构和索引(需显式开启 initialize-schema)。

引入依赖

<dependency>
<groupId>org.springframework.ai</groupId>
<artifactId>spring-ai-starter-vector-store-pgvector</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.ai</groupId>
<artifactId>spring-ai-starter-model-openai</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

注意:Spring AI 2.0 起 initialize-schema 默认关闭,需要显式开启。这是 1.x 到 2.0 的破坏性变更。

配置文件

spring:
datasource:
url:jdbc:postgresql://localhost:5432/postgres
username:postgres
password:postgres
ai:
openai:
api-key:${OPENAI_API_KEY}
vectorstore:
pgvector:
initialize-schema:true
index-type:HNSW
distance-type:COSINE_DISTANCE
dimensions:1536

关键参数说明:

参数 含义 推荐值
index-type 索引算法 HNSW(查询快,构建慢)
distance-type 向量距离算法 COSINE_DISTANCE(文本场景首选)
dimensions 向量维度 与 Embedding 模型一致(OpenAI=1536)
initialize-schema 自动建表 true(首次启动后关掉)

写入向量并搜索

@RestController
publicclass SearchController{

@Autowired
privateVectorStorevectorStore;

// 写入知识库文档
@PostMapping("/ingest")
publicStringingest(@RequestBodyList<String>texts){
List<Document>docs=texts.stream()
.map(text->newDocument(text,Map.of("source","manual")))
.toList();
vectorStore.add(docs);
return" ingested "+docs.size()+" docs";
}

// 语义搜索
@GetMapping("/search")
publicList<String>search(@RequestParamStringq){
returnvectorStore.similaritySearch(
SearchRequest.builder()
.query(q)
.topK(5)
.similarityThreshold(0.7)
.build()
).stream()
.map(Document::getText)
.toList();
}
}

调用 /search?q=Spring Boot如何配置虚拟线程 会返回语义最相关的文档片段,而不是简单的关键词匹配。

元数据过滤

pgvector 支持基于 JSON 路径的元数据过滤,适合多租户、分来源的场景:

vectorStore.similaritySearch(
SearchRequest.builder()
.query("虚拟线程配置")
.topK(3)
.filterExpression("source == 'manual' && year >= 2026")
.build()
);

过滤器会被转换为 PostgreSQL 的 jsonb_path_match 查询,性能开销很低。

踩坑记录

1. dimensions 不匹配

如果 dimensions 配置与 Embedding 模型输出不一致(比如 OpenAI text-embedding-3-small 是 1536,text-embedding-3-large 是 3072),写入时会直接报 SQL 错误。先确认模型的维度数再配置

2. initialize-schema 只开发环境开

生产环境建议手动执行 DDL,关闭自动建表。手动 SQL:

CREATEEXTENSIONIFNOTEXISTSvector;
CREATETABLEIFNOTEXISTSvector_store(
iduuidDEFAULTuuid_generate_v4()PRIMARYKEY,
contenttext,
metadatajsonb,
embeddingvector(1536)
);
CREATEINDEXONvector_storeUSINGHNSW(embeddingvector_cosine_ops);

3. 不用 pgvector 时关掉扩展

Spring AI 的 starter 会自动加载 PgVectorStore,如果不需要向量搜索,排除 starter 或加上 spring.ai.vectorstore.pgvector.enabled=false,否则启动报连接超时。

小结

如果你已经在用 PostgreSQL,pgvector 是最轻量的向量搜索方案——无需新服务、无需新运维、学习成本几乎为零。配合 Spring AI 的 VectorStore 抽象,未来换 Milvus 或 Pinecone 也只需改一个依赖,代码不用动。

完整示例代码见 Spring AI 官方文档。


参考:Spring AI - PGvector

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-06-10 13:01:47 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/731817.html
  2. 运行时间 : 0.253794s [ 吞吐率:3.94req/s ] 内存消耗:4,701.81kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=bf5499c026587d3997e457a2c83e0a9a
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  1. CONNECT:[ UseTime:0.001168s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001318s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000836s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000531s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000995s ]
  6. SELECT * FROM `set` [ RunTime:0.000403s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001267s ]
  8. SELECT * FROM `article` WHERE `id` = 731817 LIMIT 1 [ RunTime:0.000874s ]
  9. UPDATE `article` SET `lasttime` = 1781067707 WHERE `id` = 731817 [ RunTime:0.039529s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000602s ]
  11. SELECT * FROM `article` WHERE `id` < 731817 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001256s ]
  12. SELECT * FROM `article` WHERE `id` > 731817 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000827s ]
  13. SELECT * FROM `article` WHERE `id` < 731817 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006918s ]
  14. SELECT * FROM `article` WHERE `id` < 731817 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002765s ]
  15. SELECT * FROM `article` WHERE `id` < 731817 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002072s ]
0.258151s