Neo4J Cypher 数据类型转换 [英] Neo4J Cypher data type conversion

问题描述

我在我们的 Product 节点上有一个属性 quantity，我正在寻找一个密码查询，该查询为我提供 quantity = 20 ...问题是数量在neo4j中存储为字符串.有没有办法在密码查询中将属性转换为整数?

I've got a property quantity on our Product-nodes and am looking to do a cypher query that gives me all nodes with quantity = 20 ... problem is that quantity is stored as a string in neo4j. Is there a way to cast the property to integer in the cypher query?

// This fails to find the required nodes
MATCH (p:Product) WHERE p.quantity = 20;

// This finds them
MATCH (p:Product) WHERE p.quantity = "20";

// I would like to do this
MATCH (p:Product) WHERE INT(p.quantity) = 20;

PS:这是一个非常简单的用例，我们没有真正的产品和数量，但只是面对现有的将整数值存储为字符串的 Neo4j 数据，我们想对这些进行一些匹配字符串

推荐答案

你可以反过来做.

MATCH (p:Product) WHERE p.quantity = str(20) RETURN p;

也应该使用参数.

MATCH (p:Product) WHERE p.quantity = str({quantity}) RETURN p;

甚至内联属性匹配

MATCH (p:Product {quantity : str({quantity})}) RETURN p;

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