Neo4j 向量数据库

<dependency>
    <groupId>org.springframework.ai</groupId>
    <artifactId>spring-ai-neo4j-vectordb</artifactId>
    <version>${spring-ai.version}</version>
</dependency>

# Neo4j 向量数据库配置
spring.ai.neo4j.vectordb.enabled=true
spring.ai.neo4j.vectordb.uri=bolt://localhost:7687
spring.ai.neo4j.vectordb.username=neo4j
spring.ai.neo4j.vectordb.password=password
spring.ai.neo4j.vectordb.database=vectordb

@Service
public class Neo4jVectorService {
    private final Neo4jVectorClient vectorClient;

    public Neo4jVectorService(Neo4jVectorClient vectorClient) {
        this.vectorClient = vectorClient;
    }

    public void storeVector(String id, float[] vector, Map<String, Object> metadata) {
        vectorClient.store(id, vector, metadata);
    }

    public List<SearchResult> searchSimilar(float[] queryVector, int k) {
        return vectorClient.search(queryVector, k);
    }
}

@Configuration
public class Neo4jVectorStorageConfig {
    @Bean
    public VectorStorage neo4jVectorStorage(Neo4jVectorProperties properties) {
        return new Neo4jVectorStorage(properties);
    }
}

@Configuration
public class Neo4jSimilaritySearchConfig {
    @Bean
    public SimilaritySearch neo4jSimilaritySearch(Neo4jVectorProperties properties) {
        return new Neo4jSimilaritySearch(properties);
    }
}

@Service
public class GraphService {
    private final Neo4jVectorClient vectorClient;

    public void createVectorNode(String id, float[] vector) {
        vectorClient.createNode(id, vector);
    }

    public void createRelationship(String fromId, String toId, String type) {
        vectorClient.createRelationship(fromId, toId, type);
    }
}

@Configuration
public class NodeConfig {
    @Bean
    public NodeConfig nodeConfig() {
        return NodeConfig.builder()
            .label("Vector")
            .properties(Arrays.asList("id", "vector", "metadata"))
            .build();
    }
}

@Configuration
public class IndexConfig {
    @Bean
    public IndexConfig indexConfig() {
        return IndexConfig.builder()
            .name("vector_index")
            .type(IndexType.VECTOR)
            .dimension(1536)
            .build();
    }
}

management.endpoints.web.exposure.include=neo4j-vectordb
management.endpoint.neo4j-vectordb.enabled=true