Question

有以下数据：

create (_66:`User` {`ban`:4, `banned`:1, `chitaet`:942, `chitateli`:444, `disable_r`:0, `disabled_r`:0, `hide`:0, `id`:118});
create (_67:`User` {`ban`:0, `banned`:0, `chitaet`:26, `chitateli`:59, `disable_r`:0, `disabled_r`:0, `hide`:0, `id`:119});
create _66<-[:`FOLLOW` {`id`:54820, `lenta`:"main", `time`:1436720633}]-_67;
create _66-[:`FOLLOW` {`id`:54820, `lenta`:"main", `time`:1436720633}]->_67;

为什么以下查询没有返回结果？

MATCH (a:`User`)-[:FOLLOW {lenta:'main'}]->(b:`User`) WHERE a.`id` = 118 RETURN b.id AS id LIMIT 10;

Answer 1

我相信查询是按顺序执行的，因此当Neo4j到达时：

create _66<-[:`FOLLOW` {`id`:54820, `lenta`:"main", `time`:1436720633}]-_67;

它不知道_66或_67是什么。尝试：

create (_66:`User` {`ban`:4, `banned`:1, `chitaet`:942, `chitateli`:444, `disable_r`:0, `disabled_r`:0, `hide`:0, `id`:118})
,(_67:`User` {`ban`:0, `banned`:0, `chitaet`:26, `chitateli`:59, `disable_r`:0, `disabled_r`:0, `hide`:0, `id`:119})
, _66<-[:`FOLLOW` {`id`:54820, `lenta`:"main", `time`:1436720633}]-_67
, _66-[:`FOLLOW` {`id`:54820, `lenta`:"main", `time`:1436720633}]->_67;

类似的东西总是适用于我的数据库。

我建议你也返回一些值。这样您就可以验证create语句是否已成功执行

create (_66:`User` {`ban`:4, `banned`:1, `chitaet`:942, `chitateli`:444, `disable_r`:0, `disabled_r`:0, `hide`:0, `id`:118}),
(_67:`User` {`ban`:0, `banned`:0, `chitaet`:26, `chitateli`:59, `disable_r`:0, `disabled_r`:0, `hide`:0, `id`:119}), 
_66<-[:`FOLLOW` {`id`:54820, `lenta`:"main", `time`:1436720633}]-_67,
_66-[:`FOLLOW` {`id`:54820, `lenta`:"main", `time`:1436720633}]->_67,
return _66,_67;

Answer 2

您User标签中的错字 - 您要查询Users。尝试

MATCH (a:`User`)-[:FOLLOW {lenta:'main'}]->(b:`User`) WHERE a.`id` = 118 RETURN b.id AS id LIMIT 10;

查询不返回结果

2 个答案: