Question

我在相同存储桶中的couchbase中有以下两种类型的文档，称为“实体”：

{
  "documentType": "person",
  "id": "4f3567cd-782d-4456-aabd-ff5faf071476",
  "personal": {
    "gender": "Male",
    "dob": "1984-05-22",
    "firstName": "Peter",
    "lastName": "Smith",
    "idNumber": "4915040000111"
  }
}

和

{
    "id": "09690237-9ef5-4381-93dc-7312f7417f82",
    "documentType": "link",
    "entities": [
        {
            "id": "000151ef-f4b9-4cd4-bf3b-d5b07d79ed20",
            "type": "parent",
        },
        {
            "id": "000151ef-f4b9-4cd4-bf3b-d5b07d79ed21",
            "type": "child"
        }

    ]
}

人员文档描述了一个人，链接表定义了人与人之间的联系。父母可以有多个孩子，父母可以为他拥有的每个孩子提供一份链接文件。

问题：给定父母ID，返回该父母的每个孩子的所有个人信息，例如

[
    {
        "id": "000151ef-f4b9-4cd4-bf3b-d5b07d79ed21",
        "personal": {
            "gender": "Male",
            "dob": "2004-05-22",
            "firstName": "Chris",
            "lastName": "Smith",
            "idNumber": "0415050000111"
        }
    },
    {
        ...
    }
]

到目前为止：我能够使用以下方式获取所有子ID的列表：

select array_flatten(array_agg(array entity.id for entity in entities.entities when entity.type = 'parent' end), 3) as entity
from entities
where entities.docuementType = 'link'
      and any entity within entities satisfies entity.id = '01f6a9eb-0d7e-4495-a90f-f96a38aef621'
                                               and entity.type='parent' end

然而，似乎couchbase无法对子查询执行连接。有没有办法可以使用N1QL完成？目前，我唯一的解决方案是获取ID列表，然后运行另一个查询以获取子项。

Answer 1

SELECT p
FROM entities AS l 
JOIN entities AS p 
ON KEYS ARRAY e.id FOR e IN l.entities WHEN e.type = "child" END
WHERE l.docuementType = 'link'
      AND ANY entity IN l.entities 
              SATISFIES entity.id = '01f6a9eb-0d7e-4495-a90f-f96a38aef621'
                       AND entity.type='parent' END

Coucbbase中的复杂N1QL查询

1 个答案: