我正在尝试从我在MongoDB中保留的大型数据集中进行ETL导入。我已经成功导入了顶点,我觉得我还有一点语法误解而不是导入边缘。
我很确定错误发生在这个变换器中:
{"edge":{"class":"Friend", "joinFieldName":"id",
"lookup": "select from Character WHERE $input.id IN character_friends",
"unresolvedLinkAction":"CREATE"}},
所以我试图做的是从id = FOO的文档到其character_friends数组中包含FOO的所有其他文档的边缘。 如果我执行
select from Character WHERE FOO IN character_friends
在浏览器中,我得到了大量的文档,所以我的猜测是我的问题是$ input.id要么不返回我期待的id,要么可能根本没有被识别为变量。
文件如下:
{
id: FOO,
character_friends: [BAR, BAZ, QUX]
(and a bunch of other junk)
}
答案 0 :(得分:2)
似乎您正在插入属性" id",但它已在蓝图标准中保留。您可以重命名它(使用"字段"变换器)或在Orient Loader中设置它:
standardElementConstraints: false,
然后我用这个内容创建了文件/temp/datasets/charles.json:
[
{
name: "Joe",
id: 1,
friends: [2,4,5],
enemies: [6]
},
{
name: "Suzie",
id: 2,
friends: [1,4,6],
enemies: [5,2]
}
]
这条管道:
{
config: {
log: "debug",
parallel: false
},
source : {
file: { path: "/temp/datasets/charles.json", lock : true }
},
extractor : {
json: {}
},
transformers : [
{ merge: { joinFieldName:"id", lookup:"Account.id" } },
{ vertex: { class: "Account"} },
{ edge: {
"class": "Friend",
"joinFieldName": "friends",
"lookup": "Account.id",
"unresolvedLinkAction": "CREATE"
} },
{ edge: {
"class": "Enemy",
"joinFieldName": "enemies",
"lookup": "Account.id",
"unresolvedLinkAction": "CREATE"
} }
],
loader : {
orientdb: {
dbURL: "plocal:/temp/databases/charles",
dbUser: "admin",
dbPassword: "admin",
dbAutoDropIfExists: true,
dbAutoCreate: true,
standardElementConstraints: false,
tx: false,
wal: false,
batchCommit: 1000,
dbType: "graph",
classes: [{name: 'Account', extends:"V"}, {name: 'Friend', extends:"E"}, {name: 'Enemy', extends:"E"}],
indexes: [{class:"Account", fields:["id:integer"], type:"UNIQUE_HASH_INDEX" }]
}
}
}
确保使用默认版本的ETL jar的最新版本(在$ ORIENTDB / lib中替换它)。最新版本可从以下网址下载:
或者获得主要的OrientDB ETL 2.0.2。