Question

我还在玩OrientDB。现在我尝试了模式功能，看起来很棒： - ）

我有两个数据文件：joinA.txt和joinB.txt，我用它来填充具有以下模式的数据库（这两个文件的内容位于帖子的末尾）：

CREATE CLASS Employee EXTENDS V;
CREATE PROPERTY Employee.eid Integer;
CREATE PROPERTY Employee.name String;
CREATE PROPERTY Employee.eage Short;

CREATE INDEX Employee.eid unique_hash_index;

CREATE CLASS ExtendedProfile EXTENDS V;
CREATE CLASS XYZProfile EXTENDS ExtendedProfile;
CREATE PROPERTY XYZProfile.textual String;

-- SameAs can only connect Employees to ExtendedProfile 
CREATE CLASS SameAs EXTENDS E; -- same employee across many tables
CREATE PROPERTY SameAs.out LINK ExtendedProfile;
CREATE PROPERTY SameAs.In LINK Employee;

我为ETL工具提供的JSON，对于JoinA：

{
    "source": { "file": {"path": "the_path"}},
    "extractor": {"csv": {
            "separator": "  ",
            "columns": [
                "eid:Integer",
                "name:String",
                "eage:Short"
            ]
            }
        },
    "transformers": [
        {"vertex": {"class": "Employee", "skipDuplicates": true}}
        ]
    ,"loader": {
        "orientdb": {
            "dbURL": "plocal:thepath",
            "dbType": "graph",
            "useLightweightEdges": false
        }
    }
}

和JoinB：

{
    "source": { "file": {"path": "thepath"}},
    "extractor": {"csv": {
            "separator": "  ",
            "columnsOnFirstLine": false,
            "quote": "\"",
            "columns": [
                "id:String",
                "textual:String"
            ]
            }
        },
    "transformers": [
        {"vertex": {"class": "XYZProfile", "skipDuplicates": true}},
        { "edge": { "class": "SameAs", 
        "direction": "out",
        "joinFieldName": "id", 
        "lookup":"Employee.eid",
        "unresolvedLinkAction":"ERROR"}},
        ],
    "loader": {
    "orientdb": {
        "dbURL": "path",
        "dbUser": "root",
        "dbPassword": "pwd",
        "dbType": "graph",
        "useLightweightEdges": false}
    }
}

现在，问题在于，当我运行select expand(both()) from Employee时，我会在out_SameAs列中获得边缘，而当我运行select expand(both()) from XYZProfile时，我什么也得不到。这很奇怪，因为第一个查询告诉我边缘指向的@CLASS是XYZProfile。有人知道我的例子有什么问题吗？

干杯，

阿尔贝托

JoinA：

1   A   10
2   B   14
3   C   22

JoinB：

1   i0
1   i1
2   i2

Answer 1

查看您的JSON文件，我认为您的JSON文件存在错误。您忘记将[]放在JSON文件的开头和结尾。

Answer 2

这实际上是我的错。第CREATE PROPERTY SameAs.In LINK Employee;行是问题所在：In应该全都是小写的，正如here指出的那样。

OrientDB：缺少＆＃34;半边＆＃34;

2 个答案: