Question

在MySql中，我们使用两个模型用户和友谊创建简单的用户友谊数据库。

模型友谊包含键：

ID
from（ref.key）
到（ref.key）
创建
修饰
已批准（0,1）
block（0,1）

在ArangoDB中制作相同内容的正确方法是什么，可以有一个＆＃34;友谊＆＃34;带有附加键值的边缘文档？是否可以执行更新边缘文档？此外，作为结果执行请求后，这些值是否可能显示？

Answer 1

举个例子。

首先创建一个＆＃34;用户＆＃34;收藏和友谊＆＃34;集合。

arangosh [_system]> db._create("users");
[ArangoCollection 33746098, "users" (type document, status loaded)]

arangosh [_system]> db._createEdgeCollection("friendship");
[ArangoCollection 33877170, "friendship" (type edge, status loaded)]

创建两个用户

arangosh [_system]> db.users.save({_key: "you"});
{ 
  "_id" : "users/you", 
  "_rev" : "34598066", 
  "_key" : "you" 
}

arangosh [_system]> db.users.save({_key: "me"});
{ 
  "_id" : "users/me", 
  "_rev" : "34794674", 
  "_key" : "me" 
}

和他们之间的关系

arangosh [_system]> db.friendship.save("users/me", "users/you", {});
{ 
  "_id" : "friendship/35515570", 
  "_rev" : "35515570", 
  "_key" : "35515570" 
}

检查用户

arangosh [_system]> db._query("FOR u IN users RETURN u").toArray()
[ 
  { 
    "_id" : "users/me", 
    "_rev" : "34794674", 
    "_key" : "me" 
  }, 
  { 
    "_id" : "users/you", 
    "_rev" : "34598066", 
    "_key" : "you" 
  } 
]

和他们的邻居

arangosh [_system]> db._query("FOR u IN users RETURN { user: u, friends: NEIGHBORS(users, friendship, u, 'outbound') }").toArray()
[ 
  { 
    "user" : { 
      "_id" : "users/me", 
      "_key" : "me", 
      "_rev" : "34794674" 
    }, 
    "friends" : [ 
      "users/you" 
    ] 
  }, 
  { 
    "user" : { 
      "_id" : "users/you", 
      "_key" : "you", 
      "_rev" : "34598066" 
    }, 
    "friends" : [ ] 
  } 
]

添加＆＃34;阻止＆＃34;

arangosh [_system]> db._query("FOR f IN friendship FILTER f._from == 'users/me' and f._to == 'users/you' UPDATE f WITH { block: true } IN friendship RETURN { before: OLD, after: NEW }").toArray()
[ 
  { 
    "before" : { 
      "_id" : "friendship/35515570", 
      "_rev" : "35515570", 
      "_key" : "35515570", 
      "_from" : "users/me", 
      "_to" : "users/you" 
    }, 
    "after" : { 
      "block" : true, 
      "_id" : "friendship/35515570", 
      "_rev" : "63892658", 
      "_key" : "35515570", 
      "_from" : "users/me", 
      "_to" : "users/you" 
    } 
  } 
]

返回将返回整个文档。您也可以只返回块属性

arangosh [_system]> db._query("FOR f IN friendship FILTER f._from == 'users/me' and f._to == 'users/you' UPDATE f WITH { block: false } IN friendship RETURN { before: OLD.block, after: NEW.block }").toArray()
[ 
  { 
    "before" : true, 
    "after" : false 
  } 
]

ArangoDB边缘文档是否适合放置额外的键值？

1 个答案: