AQL学习笔记（六）--创建边文档

父子关系可以用图来表示，在ArangoDB中，如果两个文档具有父子关系，则可以用边文档来连接他们。边文档存储在边集合中，边文档有两个属性：_from和_to。

数据库中的人物有如下父子关系，

图表示如下，

接下来我们创建一个边文档。首先创建ChildOf集合，然后在集合中创建边文档，注意type中选择Edge。

然后在query中编写如下语句，

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LET data = [
{
"parent": { "name": "Ned", "surname": "Stark" },
"child": { "name": "Robb", "surname": "Stark" }
}, {
"parent": { "name": "Ned", "surname": "Stark" },
"child": { "name": "Sansa", "surname": "Stark" }
}, {
"parent": { "name": "Ned", "surname": "Stark" },
"child": { "name": "Arya", "surname": "Stark" }
}, {
"parent": { "name": "Ned", "surname": "Stark" },
"child": { "name": "Bran", "surname": "Stark" }
}, {
"parent": { "name": "Catelyn", "surname": "Stark" },
"child": { "name": "Robb", "surname": "Stark" }
}, {
"parent": { "name": "Catelyn", "surname": "Stark" },
"child": { "name": "Sansa", "surname": "Stark" }
}, {
"parent": { "name": "Catelyn", "surname": "Stark" },
"child": { "name": "Arya", "surname": "Stark" }
}, {
"parent": { "name": "Catelyn", "surname": "Stark" },
"child": { "name": "Bran", "surname": "Stark" }
}, {
"parent": { "name": "Ned", "surname": "Stark" },
"child": { "name": "Jon", "surname": "Snow" }
}, {
"parent": { "name": "Tywin", "surname": "Lannister" },
"child": { "name": "Jaime", "surname": "Lannister" }
}, {
"parent": { "name": "Tywin", "surname": "Lannister" },
"child": { "name": "Cersei", "surname": "Lannister" }
}, {
"parent": { "name": "Tywin", "surname": "Lannister" },
"child": { "name": "Tyrion", "surname": "Lannister" }
}, {
"parent": { "name": "Cersei", "surname": "Lannister" },
"child": { "name": "Joffrey", "surname": "Baratheon" }
}, {
"parent": { "name": "Jaime", "surname": "Lannister" },
"child": { "name": "Joffrey", "surname": "Baratheon" }
}
]

首先是定义关系，存储在data中。然后对data中每条记录进行操作，用parentId和childId分别存储rel中parent和child的id。然后将{_from:xx, _to:xx}插入到ChildOf中。结果如下。

后面的数字id每个人的不同。

AQL学习笔记（六）--创建边文档

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