Spring Data Neo4j Cypher查询使用

import org.springframework.data.neo4j.repository.Neo4jRepository;

public interface PersonRepository extends Neo4jRepository<Person, Long> {

    // 查询所有朋友
    @Query("MATCH (p:Person)-[:FRIENDS_WITH]->(friend) WHERE p.name = $name RETURN friend")
    List<Person> findFriendsByName(String name);

    // 查询朋友中年龄大于某个值的
    @Query("MATCH (p:Person)-[:FRIENDS_WITH]->(friend) WHERE p.name = $name AND friend.age > $age RETURN friend")
    List<Person> findFriendsByNameAndAge(String name, int age);
}

@Query("MATCH (p:Person)-[:FRIENDS_WITH]->(friend) " +
       "WHERE p.name = $name AND friend.age > $age " +
       "RETURN friend")
List<Person> findFriendsByNameAndAge(String name, int age);

@Service
public class PersonService {

    @Autowired
    private PersonRepository personRepository;

    public List<Person> getFriendsOlderThan(String name, int age) {
        List<Person> friends = personRepository.findFriendsByName(name);
        return friends.stream()
                      .filter(friend -> friend.getAge() > age)
                      .collect(Collectors.toList());
    }
}

import java.nio.file.Files;
import java.nio.file.Paths;

public class CypherQueryLoader {
    public String loadQuery(String filePath) throws IOException {
        return new String(Files.readAllBytes(Paths.get(filePath)));
    }
}

// 使用示例
String query = new CypherQueryLoader().loadQuery("path/to/query.cql");
session.run(query, Values.parameters("name", "Alice"));