上手DocumentDB On Azure (二)

慧9建

　　无需像传统的JsonDataSerializer一样将每一个属性标上[DataMember]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 [JsonProperty(PropertyName = "id")].
　　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>