如何在.net core 中编写neo4j 密码的用户定义函数和存储过程查询？

Question

我有这样的查询

call apoc.load.json("url") yield value
     unwind value.learningPaths as val
                 merge (n:learningPaths {id:val.uid}) Set n.modified = val.last_modofied,
                 n.type     = val.type,
                 n.locale   = val.locale,
                 n.childrens= val.number_of_children,
                 n.summary  = val.summary,
                 n.minutes  = val.duration_in_minutes,
                 n.title    = val.title,
                 n.levels = val.levels,
                 n.roles = val.roles,
                 n.modules = val.modules,
                 n.products = val.products

我如何在 .net core API 中编写该查询以在 neo4j 数据库中添加数据？

Answer 1

流利的api这里应有尽有，所以：

await client.Cypher.Call("apoc.load.json('url')").Yield("value")
        .Unwind("value.learningPaths", "val")
        .Merge("(n:learningPaths {id:val.uid})")
        .Set(@"n.modified = val.last_modofied,
                     n.type     = val.type,
                     n.locale   = val.locale,
                     n.childrens= val.number_of_children,
                     n.summary  = val.summary,
                     n.minutes  = val.duration_in_minutes,
                     n.title    = val.title,
                     n.levels = val.levels,
                     n.roles = val.roles,
                     n.modules = val.modules,
                     n.products = val.products")
                     .ExecuteWithoutResultsAsync();

如果我是你，我可能会考虑是否可以缩短 SET 以仅使用 = 来设置所有属性：

await client.Cypher.Call("apoc.load.json('url')").Yield("value")
        .Merge("(n:learningPaths {id:val.uid})")
        .Set(@"n = val")
        .ExecuteWithoutResultsAsync();

或者 += 如果你需要它是加法的：

await client.Cypher.Call("apoc.load.json('url')").Yield("value")
        .Merge("(n:learningPaths {id:val.uid})")
        .Set(@"n += val")
        .ExecuteWithoutResultsAsync();

这将取决于 val 到底有什么，请通读 SET documentation (maybe Replacing Properties or Mutating properties)。