上手DocumentDB On Azure (二)
无需像传统的JsonDataSerializer一样将每一个属性标上Attribute,只需重写Tostring方法,Newtonsoft.Json.JsonConvert.SerializeObject(this)会自动将Object属性写成Json文档,但需为键属性指定 .注意:
[*]当DataObject存在继承关系时,JsonConvert只会序列化当前类的属性,而忽略其父类的属性,因此选择合适的数据类型很重要.
[*]当DataObject继承自Document时,所有属性均需手动指定PropertyName,未指定的不会序列化;
[*]主键id为string类型,id的propertyName必须声明为"id";
public override string ToString()
{
return Newtonsoft.Json.JsonConvert.SerializeObject(this);
}
在DashBoard中加载指标时报错??
查询操作:
给出的代码部分(https://www.azure.cn/documentation/articles/documentdb-get-started/#bookmark-7),分为了linq方法和sql方法,区别怎么说呢?自己看代码吧:
IQueryable<Family> familyQuery =
this.client.CreateDocumentQuery<Family>
(
UriFactory.CreateDocumentCollectionUri(databaseName, collectionName),
queryOptions
)
.Where(f => f.LastName == "Andersen");
IQueryable<Family> familyQueryInSql =
this.client.CreateDocumentQuery<Family>
(
UriFactory.CreateDocumentCollectionUri(databaseName,
collectionName),
"SELECT * FROM Family WHERE Family.LastName = 'Andersen'",
queryOptions
);
但是,教程里说了:
The query is executed synchronously here, but can also be executed asynchronously via the
IDocumentQuery<T> interface.
来自 <https://www.azure.cn/documentation/articles/documentdb-get-started/>
而这个Interface下只有如下方法:
而且changeFeedQuery的查询参数在哪里??到底ChangeFeedQuery和FeedQuery有什么区别?回头再看吧.
搞完查,增,改,删操作,其主要逻辑是以client为对象操作数据库,这与MongoDB多少有点不同.
操作中使用最频繁的是:
[*]定位Uri,包括定位Server的EndPointUri,Database的,DocumentCollection的,Document的,还有CollectionLink也是Uri.主要调用UriFactory.CreatexxxUri(string xxxId)方法;
[*]所有的client下的操作主要就是调用Createxxx.,Readxxx,Deletexxx,Replacexxx,Excutexxx等方法来实现的;
[*]所有的操作最重要的一个参数是feedOption和RequestOption;
[*]Collection十分重要,其索引的配置和设置是DocumentDB的灵魂,玩的好还是玩的砸就看这个了.
接下来就是在UWP中使用Document了.目标用船舶数据进行测试.
这里就要考虑一致性的问题:两个客户端同时操作一条数据,以谁的为准?
权限分配原则
水尺业务员
经理
系统管理员
总经理
单证员
客户
1级读写
2级读写,宣布最终版(即锁定数据)
不能在客户端正常读写,锁定,但可以解锁,以及在系统层面更改数据
解锁数据,2级读写????
读全部数据,不可写
读部分数据
如何缓存数据到本地留备用?
如何存图片等数据?
VslData Samples
No
Name
Type
IMO
Nationality
CrewList
Capacity
L*W
Description
KeyWord
1
ASIA SPIRIT
Bulk Carrier
9637430
Hongkong
35031
179.9x28.4
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy "Tianjin Port" eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr,
Tianjin port
2
AZURIT
Bulk Carrier
9551703
Portugal
56771
189.9x32.2
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum."Tianjin Port" Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr,
Tianjin port
3
GREEN PINE
General Car..
9100504
Singapore
8637
100.6x18.8
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et "TianJin Port" dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr,
TianJin Port
4
HUAYANG SPIRIT
Bulk Carrier
9591507
Hongkong
75784
224.9x32.2
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero "take berth" eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr,
Take berth
5
KMARIN SINGAPO..
Bulk Carrier
9737357
63083
199.9x32.2
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr,
none
6
LADY I
Bulk Carrier
9336610
Marshall Islands
75356
224.9x32.2
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr,
none
7
NORD CRUX
Bulk Carrier
9728203
Singapore
81577
229x32.2
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd "take berth" gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr,
Take berth
8
REDWING
Bulk Carrier
9333931
Saint Vincent and Grenadines
53410
189.8x32.2
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr,
none
9
SHUN QIANG 28
Cargo ship
856868910
China
150x21
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr,
none
10
YANGTZE HARMONY
Bulk Carrier
9618355
Marshall Islands
56763
189.9x32.2
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr,
none
来自 <https://docs.microsoft.com/zh-cn/azure/documentdb/documentdb-request-units>
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