我要 (function localFileVideoPlayer()
{'use strict'
var URL = window.URL || window.webkitURL
var displayMessage = function (message, isError) {
var element = document.querySelector('#message')
element.innerHTML = message
element.className = isError ? 'error' : 'info'
}
var playSelectedFile = function (event)
{
var file = this.files[0]
var type = file.type
var videoNode = document.querySelector('video')
var canPlay = videoNode.canPlayType(type)
if (canPlay === '') canPlay = 'no'
var isError = canPlay === 'no'
if (isError)
{return
}
var fileURL = URL.createObjectURL(file)
videoNode.src = fileURL
}
var inputNode = document.querySelector('input')
inputNode.addEventListener('change', playSelectedFile, false)
})()
个节点：
MERGE
如果该节点不存在，我需要这样做：
MERGE (a: Article {URL: event.URL})我认为ON CREATE FOREACH( site_name in CASE WHEN event.site_name is not null then [1] ELSE [] END |
MERGE (w: Website { value: event.site_name})
MERGE (w)-[:PUBLISHED]->(a))
// all of the tag creation
FOREACH( tag in CASE WHEN event.tags is not NULL then event.tags else [] END |
Merge (t: Article_Tag {value: tag})
CREATE (a)-[: HAS_ARICLE_TAG {date:event_datetime}]->(t))
仅适用于ON CREATE，但是如上所述，我需要执行多个语句。有没有一种方法可以使用SET子句创建多个节点和关系？
编辑：我已经尝试过ON CREATE，但这不能解决SET问题。
答案 0 :(得分：0)
这是最好的方法：只需将其包装在FOREACH语句中
MATCH (a: Article {URL: event.URL})
FOREACH(ignoreme in case when a is not null then [1] else [] end |... Statement here...)