ADO.NET Data Service

 

 

关于ADO.NET Entity Framework部分的内容见ADO.NET Entity Framework(1-4)

http://www.cnblogs.com/foundation/archive/2008/10/06/1304718.html

 

本文例子下载: https://files.cnblogs.com/wxwinter/lz.rar

 

 

目录

1    ADO.NET Data Service介绍    2

2    创建DataService项目    3

2.1    数据表    3

2.2    创建ASPNET项目    4

2.3    添架ADONET Entity模型    6

2.4    添加ADO.NET数据服务    10

2.5    在浏览器中查看    12

3    NET客启访问DataService    13

3.1    引用数据服务    13

3.2    查询    15

3.3    添加    15

3.4    修改    16

3.5    删除    16

3.6    异步查询    17

4    Silverlight客启访问DataService    18

4.1    引用服务    18

4.2    xaml页面    19

4.3    查询(WebClient方式)    20

4.4    查询    21

4.5    添加    22

4.6    编辑    22

4.7    删除    23

5    URL访问    24

5.1    运算符    24

5.2    关键字    24

5.3    函数    25

5.4    例1:直接访问Entity数据    26

5.5    例2:使用条件    28

5.6    例3:排序    29

5.7    例4:分页    31

5.8    例5:函数的使用    32

6    WEB方法    33

6.1    服务    33

6.2    访问    34

7    拦截器    35

7.1    查询拦截    35

7.2    修改拦截器    36

 

 

ADO.NET Data Service介绍

 

1.ADO.NET Data Service的DataServiceHost是一个WCF Service,由System.Data.Services.DataService<T>提供来自NET3.5 SP1 类库中的System.Data.Services.dll

 

2.DataServices会自动为加载的Entity对象生成具有增查删改功能的WCF服务

 

3.DataServices是以Http方式与客户端进行通信.任何可以实现HTTP访问的客户端,都可以与DataServices交互

 

4. NET3.5 SP1的客户端可以使用System.Data.Services.Client.DataServiceContext与DataServices交互,该类来自NET3.5 SP1 类库中的System.Data.Services.Client.dll 文件

 

5. Silverlight 2.0客户端可以使用System.Data.Services.Client.DataServiceContext与DataServices交互,该类来自Silverlight 2.0 类库中的System.Data.Services.Client 文件

 

6.DataServices提供ATOM与JSON两种格式用来描述数据结构,说明如下:

ATOM

RSS类似,也是建立在XML数据格式的基础之上的

Atom相对RSS格式而言,进行了扩展,提供了比RSS更多的项目属性

JSON

格式如下

{

"name": "wxd",

"time": "2008/10/10 10:10",

"value": 123.456,

"list": [ "wxwinter", "lzm"]

}

 

创建DataService项目

数据表

tabA

 

 

tabX

创建ASPNET项目

 

添架ADONET Entity模型

 

 

 

 

 

 

添加ADO.NET数据服务

 

public class myWebDataService : DataService<myDBEntities>

{

public static void InitializeService(IDataServiceConfiguration config)

{

config.SetEntitySetAccessRule("*", EntitySetRights.All);

// * :表示全部实体集

// EntitySetRights.All : 表示全部的操作权限

}

}

 

在浏览器中查看

NET客启访问DataService

引用数据服务

 

查询

//查询

private void button1_Click(object sender, EventArgs e)

{

Uri url = new Uri("http://localhost:1468/myWebDataService.svc");

myService.myDBEntities server = new WinFormClient.myService.myDBEntities(url);

 

foreach (var v in server.tabA)

{

 

Console.WriteLine("{0},{1},{2}", v.a, v.b, v.c);

}

//-

foreach (var v in server.tabX.Where(p=>p.x=="002"))

{

 

Console.WriteLine("{0},{1},{2}", v.x, v.y, v.z);

}

 

}

 

lzm ,2 ,5

wxd ,1 ,4

wxwinter ,3 ,6

002 ,8 ,llzzmm

添加

//添加

private void button2_Click(object sender, EventArgs e)

{

Uri url = new Uri("http://localhost:1468/myWebDataService.svc");

myService.myDBEntities server = new WinFormClient.myService.myDBEntities(url);

 

server.AddTotabA(new myService.tabA() { a = "wxdlzm", b = "333", c = "xxx" });

 

server.SaveChanges();

}

 

修改

//修改

private void button3_Click(object sender, EventArgs e)

{

Uri url = new Uri("http://localhost:1468/myWebDataService.svc");

myService.myDBEntities server = new WinFormClient.myService.myDBEntities(url);

var v = server.tabA.Where(p => p.a == "wxdlzm").First();

v.b = "hello";

server.UpdateObject(v);

server.SaveChanges();

}

 

 

删除

//删除

private void button4_Click(object sender, EventArgs e)

{

Uri url = new Uri("http://localhost:1468/myWebDataService.svc");

myService.myDBEntities server = new WinFormClient.myService.myDBEntities(url);

var v = server.tabA.Where(p => p.a == "wxdlzm").First();

server.DeleteObject(v);

server.SaveChanges();

}

 

 

异步查询

//异步查询

 

myService.myDBEntities server1;

 

//开始查询

private void button5_Click(object sender, EventArgs e)

{

Uri url = new Uri("http://localhost:1468/myWebDataService.svc");

Uri urlE = new Uri("http://localhost:1468/myWebDataService.svc/tabX");

server1 = new WinFormClient.myService.myDBEntities(url);

 

server1.BeginExecute<myService.tabX>(urlE, new AsyncCallback(executed), null);

}

//返回结果

void executed(IAsyncResult obj)

{

var tp = server1.EndExecute<myService.tabX>(obj);

 

foreach (var v in tp)

{

Console.WriteLine("{0},{1},{2}", v.x, v.y, v.z);

}

 

}

 

Silverlight客启访问DataService

Silverlight 2.0 可以利用两种方法与DataServices交互:

  • HttpWebRequest 与 HttpWebResponse
  • System.Data.Services.Client.DataServiceContext

Silverlight 2.0 是使用异步方法来连接远程数据源。

 

LINQ 的 select ,要用 BeginExecute() 和 EndExecute()

LINQ 的 SaveChanges(),要用 BeginSaveChanges() 和 EndSaveChanges()

 

 

引用服务

 

xaml页面

<StackPanel Loaded="StackPanel_Loaded">

<data:DataGrid Name="dg"></data:DataGrid>

<Button Content="DataServiceContext方式加载数据" Width="200" Click="loadData_Click" />

<Button Content="WebClient方式加载数据" Width="200" Click="loadData2_Click" />

<Button Content="添加" Width="200" Click="add_Click" />

<Button Content="修改" Width="200" Click="edit_Click" />

<Button Content="删除" Width="200" Click="del_Click" />

</StackPanel>

myService.myDBEntities server;

private void StackPanel_Loaded(object sender, RoutedEventArgs e)

{

Uri url = new Uri("http://localhost:1468/myWebDataService.svc");

server = new myService.myDBEntities(url);

}

void saveChanges_completed(IAsyncResult obj)

{

 

}

 

查询(WebClient方式)

//WebClient方式加载数据

private void loadData2_Click(object sender, RoutedEventArgs e)

{

Uri uri = new Uri("http://localhost:1468/myWebDataService.svc/tabA");

WebClient client = new WebClient();

client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_completed);

client.OpenReadAsync(uri);

}

 

void client_completed(object sender, OpenReadCompletedEventArgs e)

{

if (e.Error == null)

{

XmlReader reader = XmlReader.Create(e.Result);

XDocument ls = XDocument.Load(reader);

XNamespace xmlns = "http://www.w3.org/2005/Atom";

XNamespace d = "http://schemas.microsoft.com/ado/2007/08/dataservices";

XNamespace m = "http://schemas.microsoft.com/ado/2007/08/dataservices/metadata";

 

var list = from x in ls.Descendants(xmlns + "entry")

select new myService.tabA

{

a= x.Descendants(d + "a").First().Value, b = x.Descendants(d + "b").First().Value, c = x.Descendants(d + "c").First().Value

};

dg.ItemsSource = list;

}

}

 

查询

 

//加载

private void loadData_Click(object sender, RoutedEventArgs e)

{

Uri urlE = new Uri("http://localhost:1468/myWebDataService.svc/tabX");

server.BeginExecute<myService.tabX>(urlE, new AsyncCallback(load_completed), null);

}

 

void load_completed(IAsyncResult obj)

{

var tp = server.EndExecute<myService.tabX>(obj);

this.dg.ItemsSource = tp.ToList();

}

 

添加

//添加

private void add_Click(object sender, RoutedEventArgs e)

{

server.AddTotabX(new myService.tabX() { x="007",z="sss",y="sss" });

server.BeginSaveChanges(new AsyncCallback(saveChanges_completed), null);

}

 

编辑

//编辑

private void edit_Click(object sender, RoutedEventArgs e)

{

Uri urlE = new Uri("http://localhost:1468/myWebDataService.svc/tabX");

server.BeginExecute<myService.tabX>(urlE, new AsyncCallback(begin_edit), null);

}

void begin_edit(IAsyncResult obj)

{

var tp = server.EndExecute<myService.tabX>(obj).Where(p => p.x == "007 ").First();

tp.y = "hello";

server.UpdateObject(tp);

server.BeginSaveChanges(new AsyncCallback(saveChanges_completed), null);

}

 

删除

//删除

private void del_Click(object sender, RoutedEventArgs e)

{

Uri urlE = new Uri("http://localhost:1468/myWebDataService.svc/tabX");

server.BeginExecute<myService.tabX>(urlE, new AsyncCallback(begin_del), null);

}

 

void begin_del(IAsyncResult obj)

{

var tp = server.EndExecute<myService.tabX>(obj).Where(p => p.x == "007 ").First();

server.DeleteObject(tp);

server.BeginSaveChanges(new AsyncCallback(saveChanges_completed), null);

 

}

 

 

 

 

 

URL访问

 

DataService 支持URL方式访问

格式

http://[Url]/[ServiceName]/[EntityName]/[NavigationOptions]?[QueryOptions]

Url: 数据服务所在的网址

ServiceName: 数据服务的名称

EntityName: Entity 名称或是 Service 方法名称

NavigationOptions: 查询 Entity 中关联的设定

QueryOptions: 查询的选项

 

运算符

运算符

说明

and

 

or

 

not

 

eq

=

ne

!=

lt

<

gt

>

le

<=

ge

>=

add

+

sub

-

mul

*

div

/

mod

余数

()

 

 

关键字

expand

类似于LINQ中的LoadOptions,以此来指定加载此对象相关的通过expand指定的对象。如果需要加载多个对象,用逗号分隔。

orderby

指定排序方式。语法为:$orderby=Field [ASC|DESC], [Field[ASC|DESC]]

Skip

Top

类似于LINQ中的Skip(PageSize * PageIndex).Take(PageSize)用来实现分页。

Filter

通过filter这个参数可以在URL里传递过滤条件。

 

函数

bool substringof(string p0, string p1)

 

bool startswith(string p0, string p1)

 

int indexof(string arg)

 

string remove(string p0, int pos)

 

string remove(string p0, string find, string replace)

 

string substring(string p0, int pos, int length)

 

string toupper(string p0)

 

string concat(string p0, string p1)

 

bool endswith(string p0, string p1)

 

int length(string p0)

 

string insert(string p0,int pos, string p1)

 

string remove(string p0, int pos, int length)

 

string substring(string p0, int pos)

 

string tolower(string p0)

 

string trim(string p0)

 

int day(DateTime)

 

int month(DateTime)

 

int hour(DateTime)

 

int second(DateTime)

 

int minute(DateTime)

 

int year(DateTime)

 

double round(double)

 

decimal floor(decimal)

 

decimal round(decimal)

 

double ceiling(double)

 

double floor(double)

 

decimal ceiling(decimal)

 

 

 

 

例1:直接访问Entity数据

http://localhost:1468/myWebDataService.svc/tabA

由于返回的数据是ATOM格式的,如果浏览器支持该格式,会用阅读方式打开,IE7RSS阅读器方式打开

以下是返回的数据

<?xml version="1.0" encoding="utf-8" standalone="yes"?>

<feed xml:base="http://localhost:1468/myWebDataService.svc/" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://www.w3.org/2005/Atom">

<title type="text">tabA</title>

<id>http://localhost:1468/myWebDataService.svc/tabA</id>

<updated>2008-11-17T11:14:32Z</updated>

<link rel="self" title="tabA" href="tabA" />

<entry>

<id>http://localhost:1468/myWebDataService.svc/tabA('lzm%20%20%20%20%20%20%20')</id>

<title type="text"></title>

<updated>2008-11-17T11:14:32Z</updated>

<author>

<name />

</author>

<link rel="edit" title="tabA" href="tabA('lzm%20%20%20%20%20%20%20')" />

<category term="myDBModel.tabA" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />

<content type="application/xml">

<m:properties>

<d:a xml:space="preserve">lzm </d:a>

<d:b xml:space="preserve">2 </d:b>

<d:c xml:space="preserve">5 </d:c>

</m:properties>

</content>

</entry>

<entry>

<id>http://localhost:1468/myWebDataService.svc/tabA('wxd%20%20%20%20%20%20%20')</id>

<title type="text"></title>

<updated>2008-11-17T11:14:32Z</updated>

<author>

<name />

</author>

<link rel="edit" title="tabA" href="tabA('wxd%20%20%20%20%20%20%20')" />

<category term="myDBModel.tabA" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />

<content type="application/xml">

<m:properties>

<d:a xml:space="preserve">wxd </d:a>

<d:b xml:space="preserve">1 </d:b>

<d:c xml:space="preserve">4 </d:c>

</m:properties>

</content>

</entry>

<entry>

<id>http://localhost:1468/myWebDataService.svc/tabA('wxdlzm%20%20%20%20')</id>

<title type="text"></title>

<updated>2008-11-17T11:14:32Z</updated>

<author>

<name />

</author>

<link rel="edit" title="tabA" href="tabA('wxdlzm%20%20%20%20')" />

<category term="myDBModel.tabA" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />

<content type="application/xml">

<m:properties>

<d:a xml:space="preserve">wxdlzm </d:a>

<d:b xml:space="preserve">333 </d:b>

<d:c xml:space="preserve">xxx </d:c>

</m:properties>

</content>

</entry>

<entry>

<id>http://localhost:1468/myWebDataService.svc/tabA('wxwinter%20%20')</id>

<title type="text"></title>

<updated>2008-11-17T11:14:32Z</updated>

<author>

<name />

</author>

<link rel="edit" title="tabA" href="tabA('wxwinter%20%20')" />

<category term="myDBModel.tabA" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />

<content type="application/xml">

<m:properties>

<d:a xml:space="preserve">wxwinter </d:a>

<d:b xml:space="preserve">3 </d:b>

<d:c xml:space="preserve">6 </d:c>

</m:properties>

</content>

</entry>

</feed>

 

例2:使用条件

http://localhost:1468/myWebDataService.svc/tabA?$filter=a eq 'wxd'

http://localhost:1468/myWebDataService.svc/tabA?$filter=(a eq 'wxwinter') and (b eq '3')

<?xml version="1.0" encoding="utf-8" standalone="yes"?>

<feed xml:base="http://localhost:1468/myWebDataService.svc/" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://www.w3.org/2005/Atom">

<title type="text">tabA</title>

<id>http://localhost:1468/myWebDataService.svc/tabA</id>

<updated>2008-11-17T11:26:29Z</updated>

<link rel="self" title="tabA" href="tabA" />

<entry>

<id>http://localhost:1468/myWebDataService.svc/tabA('wxd%20%20%20%20%20%20%20')</id>

<title type="text"></title>

<updated>2008-11-17T11:26:29Z</updated>

<author>

<name />

</author>

<link rel="edit" title="tabA" href="tabA('wxd%20%20%20%20%20%20%20')" />

<category term="myDBModel.tabA" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />

<content type="application/xml">

<m:properties>

<d:a xml:space="preserve">wxd </d:a>

<d:b xml:space="preserve">1 </d:b>

<d:c xml:space="preserve">4 </d:c>

</m:properties>

</content>

</entry>

</feed>

 

例3:排序

http://localhost:1468/myWebDataService.svc/tabA?$filter=a ne 'wxd' &$orderby=b

<?xml version="1.0" encoding="utf-8" standalone="yes"?>

<feed xml:base="http://localhost:1468/myWebDataService.svc/" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://www.w3.org/2005/Atom">

<title type="text">tabA</title>

<id>http://localhost:1468/myWebDataService.svc/tabA</id>

<updated>2008-11-17T11:28:10Z</updated>

<link rel="self" title="tabA" href="tabA" />

<entry>

<id>http://localhost:1468/myWebDataService.svc/tabA('lzm%20%20%20%20%20%20%20')</id>

<title type="text"></title>

<updated>2008-11-17T11:28:10Z</updated>

<author>

<name />

</author>

<link rel="edit" title="tabA" href="tabA('lzm%20%20%20%20%20%20%20')" />

<category term="myDBModel.tabA" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />

<content type="application/xml">

<m:properties>

<d:a xml:space="preserve">lzm </d:a>

<d:b xml:space="preserve">2 </d:b>

<d:c xml:space="preserve">5 </d:c>

</m:properties>

</content>

</entry>

<entry>

<id>http://localhost:1468/myWebDataService.svc/tabA('wxwinter%20%20')</id>

<title type="text"></title>

<updated>2008-11-17T11:28:10Z</updated>

<author>

<name />

</author>

<link rel="edit" title="tabA" href="tabA('wxwinter%20%20')" />

<category term="myDBModel.tabA" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />

<content type="application/xml">

<m:properties>

<d:a xml:space="preserve">wxwinter </d:a>

<d:b xml:space="preserve">3 </d:b>

<d:c xml:space="preserve">6 </d:c>

</m:properties>

</content>

</entry>

<entry>

<id>http://localhost:1468/myWebDataService.svc/tabA('wxdlzm%20%20%20%20')</id>

<title type="text"></title>

<updated>2008-11-17T11:28:10Z</updated>

<author>

<name />

</author>

<link rel="edit" title="tabA" href="tabA('wxdlzm%20%20%20%20')" />

<category term="myDBModel.tabA" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />

<content type="application/xml">

<m:properties>

<d:a xml:space="preserve">wxdlzm </d:a>

<d:b xml:space="preserve">333 </d:b>

<d:c xml:space="preserve">xxx </d:c>

</m:properties>

</content>

</entry>

</feed>

 

例4:分页

http://localhost:1468/myWebDataService.svc/tabA?$filter=a ne 'wxd' &$orderby=b &$skip=2&top=2

<?xml version="1.0" encoding="utf-8" standalone="yes"?>

<feed xml:base="http://localhost:1468/myWebDataService.svc/" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://www.w3.org/2005/Atom">

<title type="text">tabA</title>

<id>http://localhost:1468/myWebDataService.svc/tabA</id>

<updated>2008-11-17T11:30:20Z</updated>

<link rel="self" title="tabA" href="tabA" />

<entry>

<id>http://localhost:1468/myWebDataService.svc/tabA('wxdlzm%20%20%20%20')</id>

<title type="text"></title>

<updated>2008-11-17T11:30:20Z</updated>

<author>

<name />

</author>

<link rel="edit" title="tabA" href="tabA('wxdlzm%20%20%20%20')" />

<category term="myDBModel.tabA" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />

<content type="application/xml">

<m:properties>

<d:a xml:space="preserve">wxdlzm </d:a>

<d:b xml:space="preserve">333 </d:b>

<d:c xml:space="preserve">xxx </d:c>

</m:properties>

</content>

</entry>

</feed>

 

例5:函数的使用

 

http://localhost:1468/myWebDataService.svc/tabA?$filter=a eq trim(' wxd ')

<?xml version="1.0" encoding="utf-8" standalone="yes"?>

<feed xml:base="http://localhost:1468/myWebDataService.svc/" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://www.w3.org/2005/Atom">

<title type="text">tabA</title>

<id>http://localhost:1468/myWebDataService.svc/tabA</id>

<updated>2008-11-17T12:01:49Z</updated>

<link rel="self" title="tabA" href="tabA" />

<entry>

<id>http://localhost:1468/myWebDataService.svc/tabA('wxd%20%20%20%20%20%20%20')</id>

<title type="text"></title>

<updated>2008-11-17T12:01:49Z</updated>

<author>

<name />

</author>

<link rel="edit" title="tabA" href="tabA('wxd%20%20%20%20%20%20%20')" />

<category term="myDBModel.tabA" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />

<content type="application/xml">

<m:properties>

<d:a xml:space="preserve">wxd </d:a>

<d:b xml:space="preserve">1 </d:b>

<d:c xml:space="preserve">4 </d:c>

</m:properties>

</content>

</entry>

</feed>

 

WEB方法

[WebGet] 使用 GET方式访问

[WebInvoke] 使用 POST/PUT/DELETE 方式访问

 

服务

public class myWebDataService : DataService<myDBEntities>

{

 

public static void InitializeService(IDataServiceConfiguration config)

{

config.SetEntitySetAccessRule("*", EntitySetRights.All);

// * :表示全部实体集

// EntitySetRights.All : 表示全部的操作权限

 

// config.SetServiceOperationAccessRule("getTabA", ServiceOperationRights.All);

config.SetServiceOperationAccessRule("*", ServiceOperationRights.All);

// * :表示全部实体集

// ServiceOperationRights.All : 表示全部的操作权限

}

 

[WebGet]

public IQueryable<tabA> getTabA(string a)

{

var v= CurrentDataSource.tabA.Where(p => p.a == a);

return v;

}

 

[WebInvoke]

public IQueryable<tabX> getTabX(string x)

{

var v = CurrentDataSource.tabX.Where(p => p.x == x);

return v;

}

}

 

访问

方法名?参数='值

'

http://localhost:1468/myWebDataService.svc/getTabA?a='lzm'

<?xml version="1.0" encoding="utf-8" standalone="yes"?>

<feed xml:base="http://localhost:1468/myWebDataService.svc/" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://www.w3.org/2005/Atom">

<title type="text">getTabA</title>

<id>http://localhost:1468/myWebDataService.svc/getTabA</id>

<updated>2008-11-17T02:23:29Z</updated>

<link rel="self" title="getTabA" href="getTabA" />

<entry>

<id>http://localhost:1468/myWebDataService.svc/tabA('lzm%20%20%20%20%20%20%20')</id>

<title type="text"></title>

<updated>2008-11-17T02:23:29Z</updated>

<author>

<name />

</author>

<link rel="edit" title="tabA" href="tabA('lzm%20%20%20%20%20%20%20')" />

<category term="myDBModel.tabA" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />

<content type="application/xml">

<m:properties>

<d:a xml:space="preserve">lzm </d:a>

<d:b xml:space="preserve">2 </d:b>

<d:c xml:space="preserve">5 </d:c>

</m:properties>

</content>

</entry>

</feed>

 

 

拦截器

查询拦截:当你仅仅想把具有某种状态或者特征的数据返回给客户端时,用拦截查询就可以实现

 

修改拦截:可以拦截提交到服务器的的数据更新操作:Add, Change ,Delete

查询拦截

public class myWebDataService : DataService<myDBEntities>

{

 

public static void InitializeService(IDataServiceConfiguration config)

{

config.SetEntitySetAccessRule("*", EntitySetRights.All);

// * :表示全部实体集

// EntitySetRights.All : 表示全部的操作权限

}

 

[QueryInterceptor("tabX")]

public System.Linq.Expressions.Expression<Func<tabX, bool>> query_tabX()

{

return p => p.z != "wwxxdd"; //为真表示允许查询

}

 

}

不使用QueryInterceptor的结果

 

使用QueryInterceptor的结果

 

 

修改拦截器

public class myWebDataService : DataService<myDBEntities>

{

 

public static void InitializeService(IDataServiceConfiguration config)

{

config.SetEntitySetAccessRule("*", EntitySetRights.All);

// * :表示全部实体集

// EntitySetRights.All : 表示全部的操作权限

}

[ChangeInterceptor("tabX")]

public void change_tabX(tabX en, UpdateOperations operation)

{

//-

if (operation == UpdateOperations.Add)

{

if (string.IsNullOrEmpty(en.y))

{

//如果[y]为空的处理代码

}

}

//-

if (operation == UpdateOperations.Change)

{ }

//-

if (operation == UpdateOperations.Delete)

{ }

}

}

 

 

 

 

 

 

 

 

 

posted @ 2008-11-18 09:05  WXWinter(冬)  阅读(7156)  评论(27编辑  收藏  举报