通过一个 joinFieldName 和查找,边缘转换器可以完美工作。然而,现在需要两个键,即查找中的复合索引。如何指定两个joinFieldName?
这是脚本化(后处理)版本: 创建边缘从(从 MC 中选择,其中sample=1 和 mkey=6)扩展到(从Event 中选择,其中sample=1 和 mcl=6)。
这可以工作,但不适合生产。
有人可以帮忙吗?
最佳答案
您可以简单地添加 2 个 joinFieldName(s),例如
{ "edge": { "class": "Conn",
"joinFieldName": "b1",
"lookup": "A.a1",
"joinFieldName": "b2",
"lookup": "A.a2",
"direction": "out"
}}
请参阅下面我的测试数据:
json1.json
{
"source": { "file": { "path": "/home/ivan/Scrivania/cose/etl/stak39517796/data1.csv" } },
"extractor": { "csv": {} },
"transformers": [
{ "vertex": { "class": "A" } }
],
"loader": {
"orientdb": {
"dbURL": "plocal:/home/ivan/OrientDB/db_installati/enterprise/orientdb-enterprise-2.2.10/databases/stack39517796",
"dbType": "graph",
"dbAutoCreate": true,
"classes": [
{"name": "A", "extends": "V"},
{"name": "B", "extends": "V"},
{"name": "Conn", "extends": "E"}
]
}
}
}
json2.json
{
"source": { "file": { "path": "/home/ivan/Scrivania/cose/etl/stak39517796/data2.csv" } },
"extractor": { "csv": {} },
"transformers": [
{ "vertex": { "class": "B" } },
{ "edge": { "class": "Conn",
"joinFieldName": "b1",
"lookup": "A.a1",
"joinFieldName": "b2",
"lookup": "A.a2",
"direction": "out"
}}
],
"loader": {
"orientdb": {
"dbURL": "plocal:/home/ivan/OrientDB/db_installati/enterprise/orientdb-enterprise-2.2.10/databases/stack39517796",
"dbType": "graph",
"dbAutoCreate": true,
"classes": [
{"name": "A", "extends": "V"},
{"name": "B", "extends": "V"},
{"name": "Conn", "extends": "E"}
]
}
}
}
数据1.csv
a1,a2
1,1
1,2
2,3
数据2.csv
b1,b2
1,1
2,3
1,2
执行顺序:
- json1
- json2
这是最终结果:
orientdb {db=stack39517796}> select from v
+----+-----+------+----+----+-------+----+----+--------+
|# |@RID |@CLASS|a1 |a2 |in_Conn|b2 |b1 |out_Conn|
+----+-----+------+----+----+-------+----+----+--------+
|0 |#17:0|A |1 |1 |[#25:0]| | | |
|1 |#18:0|A |1 |2 |[#27:0]| | | |
|2 |#19:0|A |2 |3 |[#26:0]| | | |
|3 |#21:0|B | | | |1 |1 |[#25:0] |
|4 |#22:0|B | | | |3 |2 |[#26:0] |
|5 |#23:0|B | | | |2 |1 |[#27:0] |
+----+-----+------+----+----+-------+----+----+--------+
关于OrientDB ETL 边缘转换器 2 joinFieldName(s),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39517796/