[英]NoSQL statistics type query with BaasBox - OrientDB 1.7.10
I'm trying out BaasBox v0.9.2 which ships with OrientDB 1.7.10 for a proof of concept web app I want to build. 我正在尝试与OrientDB 1.7.10一起提供的BaasBox v0.9.2,作为我要构建的概念证明Web应用程序。 Premise is fairly simple and adding/querying is very straight forward and simple for single collections.
前提非常简单,添加/查询非常简单,对于单个集合也很简单。 What I'm having difficulty trying to visualize is how to get statistics type information in NoSQL.
我很难形象化的是如何在NoSQL中获取统计信息类型信息。
For example, I have a collection of Contacts (firstName, lastName, address, etc) and a collection of Events (title, date, time, etc) and each Event has an array of attendees. 例如,我有一个联系人集合(名字,姓氏,地址等)和一个事件集合(标题,日期,时间等),每个事件都有一组参与者。
Objects look something like this: 对象看起来像这样:
Contact 联系
{
"firstName": "John",
"lastName": "Doe",
"appId": "64f00bcb-cc04-4ed9-89fc-3b9b1a448dae"
}
Event 事件
{
"title": "Some Event",
"eventDate": "2015-02-24 04:46 PM",
"isoDate": "2015-02-24T20:46:00.000Z",
"appId": "64f00bcb-cc04-4ed9-89fc-3b9b1a448dae",
"attendees": [
{"contactId": "c8ae2767-5fe5-4d41-ad6a-b10bd6e62f03", "attended": true},
{"contactId": "eacff8ff-b691-4d82-9429-898a097ea43a", "attended": true},
{"contactId": "70ab166c-c0a0-488a-9d5f-6f0b70a32125", "attended": false},
{"contactId": "34944c69-ebdb-49c6-bd1b-cdb0d191f124", "attended": true},
{"contactId": "8907e99e-96d6-46e9-a76f-1f9ce7f760d3", "attended": true}
]
}
What I would like to know is: 我想知道的是:
What was the last event that John Doe attended? John Doe参加的最后一次活动是什么? How many events has John Doe missed?
John Doe错过了多少个赛事?
I would prefer an example using Baasbox JS-SDK, but the Plugin-API is also acceptable as is re-organizing the data as nothing is set in stone. 我希望使用使用Baasbox JS-SDK的示例,但是Plugin-API也是可以接受的,因为没有什么困难,因此可以重新组织数据。
you can use any operator/function provided by OrientDB http://www.orientechnologies.com/docs/1.7.8/orientdb.wiki/SQL-Where.html 您可以使用OrientDB提供的任何运算符/功能http://www.orientechnologies.com/docs/1.7.8/orientdb.wiki/SQL-Where.html
In BaasBox you can use the key "fields" for projections and "where" for selections. 在BaasBox中,可以将键“ fields”用于投影,将“ where”用于选择。 So in your case the code should be something like:
因此,在您的情况下,代码应类似于:
BaasBox.loadCollectionWithParams("Event",
{
fields:"max(eventDate) as last_date", //or count(*) as times
where:"attendees contains (attended=true and contactId='<john_contact_id>')"
})
.done(function(res) {
console.log("res ", res);
})
.fail(function(error) {
console.log("error ", error);
});
The REST API calls are: REST API调用为:
GET /document/event?fields=max(eventDate) as last_date&where=attendees contains (attended=true and contactId='<john_contact_id>')
GET /document/event?fields=count(*) as times&where=attendees contains (attended=true and contactId='<john_contact_id>')
Refs: 参考文献:
http://www.orientechnologies.com/docs/1.7.8/orientdb.wiki/SQL-Where.html http://www.orientechnologies.com/docs/1.7.8/orientdb.wiki/SQL-Where.html
http://www.baasbox.com/documentation/?javascript#retrieve-documents ( Retrieve documents by a query paragraph) http://www.baasbox.com/documentation/?javascript#retrieve-documents ( 通过查询段落检索文档 )
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