使用过程中遇到的问题记录

1、使用 $param 参数问题，如查询某些标签时不需要自动加双引号，如 match(n:label),而lable作为参数时，会自动加双引号变为 match(n:"label"), 这就会导致脚本出错，如代码中的参数 knowledgePointLabel 被加了双引号导致查询错误

package com.haiwanyoutian.hai.graph.repository;

import com.haiwanyoutian.hai.graph.model.neo4j.KnowledgeEntry;
import org.springframework.data.neo4j.repository.Neo4jRepository;
import org.springframework.data.neo4j.repository.query.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;

/**
 * 知识词条 持久层
 *
 * @author kou
 */
@Repository
public interface KnowledgeEntryRepository extends Neo4jRepository<KnowledgeEntry, Long> {

	/**
	 * 统计文献关联的知识词条下的知识点数量
	 * (文献)-[r:`知识词条`]->(知识点)
	 *
	 * @param literatureId        文献id
	 * @param knowledgePointLabel 知识点label
	 * @return 结果
	 */
	@Query("MATCH(n:`文献`) " +
			"where id(n) = $literatureId " +
			"with n " +
			"match (n)-[r:`知识词条`]-(k:`$knowledgePointLabel`) " +
			"return count(k) ")
	int countLiteratureKnowledgePoints(@Param("literatureId") Long literatureId, @Param("knowledgePointLabel") String knowledgePointLabel);

}

解决方法：

1、使用cypher 脚本执行，进行拼接
2、更新cypher 脚本

@Query("MATCH(n:`文献`),(k) " +
			"where id(n) = $literatureId " +
			"and [x in labels(k) where x = $knowledgePointLabel] " +
			"with n,k " +
			"match (n)-[r:`知识词条`]-(k) " +
			"return count(k) ")