关系数据在哪里？
我正在使用HTTP API（以及用于测试的Web界面）与Neo4j进行交互。我想绘制一个关系图，但我无法弄清楚关系数据在事务响应中的位置，因为relationship数组都是空的。关系数据显然存在于某处，因为Web界面正在从这些数据中绘制关系图。
例如，当我运行查询match (n) return (n)时，Web界面会提供以下响应数据（这是来自neo4j提供的示例影片集）：
{
"results": [
{
"columns": [
"n"
],
"data": [
{
"row": [
{
"tagline": "Welcome to the Real World",
"title": "The Matrix",
"released": 1999
}
],
"meta": [
{
"id": 181,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "181",
"labels": [
"Movie"
],
"properties": {
"tagline": "Welcome to the Real World",
"title": "The Matrix",
"released": 1999
}
}
],
"relationships": []
}
},
{
"row": [
{
"born": 1964,
"name": "Keanu Reeves"
}
],
"meta": [
{
"id": 182,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "182",
"labels": [
"Person"
],
"properties": {
"born": 1964,
"name": "Keanu Reeves"
}
}
],
"relationships": []
}
},
{
"row": [
{
"born": 1967,
"name": "Carrie-Anne Moss"
}
],
"meta": [
{
"id": 183,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "183",
"labels": [
"Person"
],
"properties": {
"born": 1967,
"name": "Carrie-Anne Moss"
}
}
],
"relationships": []
}
},
{
"row": [
{
"born": 1961,
"name": "Laurence Fishburne"
}
],
"meta": [
{
"id": 184,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "184",
"labels": [
"Person"
],
"properties": {
"born": 1961,
"name": "Laurence Fishburne"
}
}
],
"relationships": []
}
},
{
"row": [
{
"born": 1960,
"name": "Hugo Weaving"
}
],
"meta": [
{
"id": 185,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "185",
"labels": [
"Person"
],
"properties": {
"born": 1960,
"name": "Hugo Weaving"
}
}
],
"relationships": []
}
},
{
"row": [
{
"born": 1967,
"name": "Andy Wachowski"
}
],
"meta": [
{
"id": 186,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "186",
"labels": [
"Person"
],
"properties": {
"born": 1967,
"name": "Andy Wachowski"
}
}
],
"relationships": []
}
},
{
"row": [
{
"born": 1965,
"name": "Lana Wachowski"
}
],
"meta": [
{
"id": 187,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "187",
"labels": [
"Person"
],
"properties": {
"born": 1965,
"name": "Lana Wachowski"
}
}
],
"relationships": []
}
},
{
"row": [
{
"born": 1952,
"name": "Joel Silver"
}
],
"meta": [
{
"id": 188,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "188",
"labels": [
"Person"
],
"properties": {
"born": 1952,
"name": "Joel Silver"
}
}
],
"relationships": []
}
},
{
"row": [
{
"born": 1978,
"name": "Emil Eifrem"
}
],
"meta": [
{
"id": 189,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "189",
"labels": [
"Person"
],
"properties": {
"born": 1978,
"name": "Emil Eifrem"
}
}
],
"relationships": []
}
},
{
"row": [
{
"tagline": "Free your mind",
"title": "The Matrix Reloaded",
"released": 2003
}
],
"meta": [
{
"id": 190,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "190",
"labels": [
"Movie"
],
"properties": {
"tagline": "Free your mind",
"title": "The Matrix Reloaded",
"released": 2003
}
}
],
"relationships": []
}
},
{
"row": [
{
"tagline": "Everything that has a beginning has an end",
"title": "The Matrix Revolutions",
"released": 2003
}
],
"meta": [
{
"id": 191,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "191",
"labels": [
"Movie"
],
"properties": {
"tagline": "Everything that has a beginning has an end",
"title": "The Matrix Revolutions",
"released": 2003
}
}
],
"relationships": []
}
},
{
"row": [
{
"tagline": "Evil has its winning ways",
"title": "The Devil's Advocate",
"released": 1997
}
],
"meta": [
{
"id": 192,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "192",
"labels": [
"Movie"
],
"properties": {
"tagline": "Evil has its winning ways",
"title": "The Devil's Advocate",
"released": 1997
}
}
],
"relationships": []
}
},
{
"row": [
{
"born": 1975,
"name": "Charlize Theron"
}
],
"meta": [
{
"id": 193,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "193",
"labels": [
"Person"
],
"properties": {
"born": 1975,
"name": "Charlize Theron"
}
}
],
"relationships": []
}
},
{
"row": [
{
"born": 1940,
"name": "Al Pacino"
}
],
"meta": [
{
"id": 194,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "194",
"labels": [
"Person"
],
"properties": {
"born": 1940,
"name": "Al Pacino"
}
}
],
"relationships": []
}
},
{
"row": [
{
"born": 1944,
"name": "Taylor Hackford"
}
],
"meta": [
{
"id": 195,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "195",
"labels": [
"Person"
],
"properties": {
"born": 1944,
"name": "Taylor Hackford"
}
}
],
"relationships": []
}
},
{
"row": [
{
"tagline": "In the heart of the nation's capital, in a courthouse of the U.S. government, one man will stop at nothing to keep his honor, and one will stop at nothing to find the truth.",
"title": "A Few Good Men",
"released": 1992
}
],
"meta": [
{
"id": 196,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "196",
"labels": [
"Movie"
],
"properties": {
"tagline": "In the heart of the nation's capital, in a courthouse of the U.S. government, one man will stop at nothing to keep his honor, and one will stop at nothing to find the truth.",
"title": "A Few Good Men",
"released": 1992
}
}
],
"relationships": []
}
},
{
"row": [
{
"born": 1962,
"name": "Tom Cruise"
}
],
"meta": [
{
"id": 197,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "197",
"labels": [
"Person"
],
"properties": {
"born": 1962,
"name": "Tom Cruise"
}
}
],
"relationships": []
}
},
[...cropped...]
{
"row": [
{
"name": "Jessica Thompson"
}
],
"meta": [
{
"id": 350,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "350",
"labels": [
"Person"
],
"properties": {
"name": "Jessica Thompson"
}
}
],
"relationships": []
}
},
{
"row": [
{
"name": "James Thompson"
}
],
"meta": [
{
"id": 351,
"type": "node",
"deleted": false
}
],
"graph": {
"nodes": [
{
"id": "351",
"labels": [
"Person"
],
"properties": {
"name": "James Thompson"
}
}
],
"relationships": []
}
}
],
"stats": {
"contains_updates": false,
"nodes_created": 0,
"nodes_deleted": 0,
"properties_set": 0,
"relationships_created": 0,
"relationship_deleted": 0,
"labels_added": 0,
"labels_removed": 0,
"indexes_added": 0,
"indexes_removed": 0,
"constraints_added": 0,
"constraints_removed": 0
}
}
],
"errors": [],
"responseTime": 225
}
我在这里的任何地方都看不到关系数据，所有relationship数组都是空的？然而，不知何故，Web界面设法从这些数据中绘制这个图：
我显然遗漏了一些关于如何从neo4j响应中提取关系数据的批评。
1 个答案:
答案 0 :(得分：2)
您的查询没有别名或返回任何关系。前端显示它们，因为它显示它显示的节点之间存在的任何关系。使您的查询类似于MATCH () - [r] - () RETURN r，您会看到一些关系数据显示。
编辑：您的RETURN语句确定从API返回的数据。如果您不要求它返回任何关系，HTTP响应将不会包含它们，但浏览器视图将智能地显示关系。但是，您可以返回一个关系，就像返回节点一样：使用模式为其指定别名，然后返回别名。
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