Conceptual Model

概念模型

用于描述實體(Entity)類型及其關系

Storage Model

存儲模型

用于描述數據庫實際存儲架構

Mapping Specification

映射規范

將概念模型和存儲模型連接起來，以便進行操作轉換

Entity Class

實體類

用于描述實體的屬性，每一個實體類都會定義一個屬性或多個屬性為一個鍵屬性（Key Properties），用于唯一標識一個實體

實體類型可以通過繼承關系加以擴展

Entity Set

實體集

實體（Entity）存在于實體集(Entity Set)中，就像表格中的行存在于表格中的一樣

Entity Containe

實體容器,

實體集定義在實體容器（Entity Container）中

關聯

關聯

定義了實體之間的關系,可以直接通過關聯，來訪問相關聯的對象,關聯分為一對一、一對多、多對多

關聯通過Association Type來定義,過實體類中的Navigation屬性就可以訪問與實體相關聯的實體

Conceptual schema definition language (.csdl)

Store schema definition language (.ssdl)

Mapping specification language (.msl)

數據庫中的表

模型

模型生成選項

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

<edmx:Edmx Version="1.0" xmlns:edmx="http://schemas.microsoft.com/ado/2007/06/edmx">

<!-- EF Runtime content -->

<edmx:Runtime>

存儲模型

<!-- SSDL content -->

<edmx:StorageModels>

<Schema Namespace="myModel.Store" Alias="Self" Provider="System.Data.SqlClient" ProviderManifestToken="2008" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" xmlns="http://schemas.microsoft.com/ado/2006/04/edm/ssdl">

<EntityContainer Name="myModelStoreContainer">

<EntitySet Name="myTab" EntityType="myModel.Store.myTab" store:Type="Tables" Schema="dbo" />

</EntityContainer>

<EntityType Name="myTab">

<Key>

<PropertyRef Name="a" />

</Key>

<Property Name="a" Type="nchar" Nullable="false" MaxLength="10" />

<Property Name="b" Type="nchar" Nullable="false" MaxLength="10" />

<Property Name="c" Type="nchar" MaxLength="10" />

<Property Name="d" Type="nchar" MaxLength="10" />

</EntityType>

</Schema>

</edmx:StorageModels>

概念模型

<!-- CSDL content -->

<edmx:ConceptualModels>

<Schema Namespace="myModel" Alias="Self" xmlns="http://schemas.microsoft.com/ado/2006/04/edm">

<EntityContainer Name="mySets">

<EntitySet Name="myTab" EntityType="myModel.myTab" />

</EntityContainer>

<EntityType Name="myTab">

<Key>

<PropertyRef Name="aa" />

</Key>

<Property Name="aa" Type="String" Nullable="false" MaxLength="10" Unicode="true" FixedLength="true" />

<Property Name="bb" Type="String" Nullable="false" MaxLength="10" Unicode="true" FixedLength="true" />

<Property Name="cc" Type="String" MaxLength="10" Unicode="true" FixedLength="true" />

<Property Name="dd" Type="String" MaxLength="10" Unicode="true" FixedLength="true" />

?

</EntityType>

</Schema>

</edmx:ConceptualModels>

映射

<!-- C-S mapping content -->

<edmx:Mappings>

<Mapping Space="C-S" xmlns="urn:schemas-microsoft-com:windows:storage:mapping:CS">

<EntityContainerMapping StorageEntityContainer="myModelStoreContainer" CdmEntityContainer="mySets">

<EntitySetMapping Name="myTab">

<EntityTypeMapping TypeName="IsTypeOf(myModel.myTab)">

<MappingFragment StoreEntitySet="myTab">

<ScalarProperty Name="aa" ColumnName="a" />

<ScalarProperty Name="bb" ColumnName="b" />

<ScalarProperty Name="cc" ColumnName="d" />

<ScalarProperty Name="dd" ColumnName="c" />

</MappingFragment>

</EntityTypeMapping>

</EntitySetMapping>

</EntityContainerMapping>

</Mapping>

</edmx:Mappings>

</edmx:Runtime>

圖形設計器的配置部份

<!-- EF Designer content (DO NOT EDIT MANUALLY BELOW HERE) -->

<edmx:Designer xmlns="http://schemas.microsoft.com/ado/2007/06/edmx">

<edmx:Connection>

<DesignerInfoPropertySet>

<DesignerProperty Name="MetadataArtifactProcessing" Value="EmbedInOutputAssembly" />

</DesignerInfoPropertySet>

</edmx:Connection>

<edmx:Options>

<DesignerInfoPropertySet>

<DesignerProperty Name="ValidateOnBuild" Value="true" />

</DesignerInfoPropertySet>

</edmx:Options>

<!-- Diagram content (shape and connector positions) -->

<edmx:Diagrams>

<Diagram Name="myModel">

<EntityTypeShape EntityType="myModel.myTab" Width="1.5" PointX="0.75" PointY="0.75" Height="1.7" IsExpanded="true" />

</Diagram>

</edmx:Diagrams>

</edmx:Designer>

</edmx:Edmx>

public class myContext :ObjectContext

{

?

public myContext(EntityConnection connection) :

base(connection, "mySets")

{

?

}

?

public ObjectQuery<myTab> myTab

{

get

{

if ((this._myTab == null))

{

this._myTab = base.CreateQuery<myTab>("[myTab]");

}

return this._myTab;

}

}

private ObjectQuery<myTab> _myTab;

?

?

public void AddTomyTab(myTab myTab)

{

base.AddObject("myTab", myTab);

}

}

[EdmEntityType(NamespaceName = "myModel", Name = "myTab")]

[DataContract(IsReference = true)]

[Serializable()]

?

public class myTab :EntityObject

{

?

public static myTab CreatemyTab(string aa, string bb)

{

myTab myTab = new myTab();

myTab.aa = aa;

myTab.bb = bb;

return myTab;

}

?

private string _aa;

[EdmScalarProperty(EntityKeyProperty = true, IsNullable = false)]

[DataMember()]

public string aa

{

get

{

return this._aa;

}

set

{

this.ReportPropertyChanging("aa");

this._aa = StructuralObject.SetValidValue(value, false);

this.ReportPropertyChanged("aa");

}

}

?

?

?

private string _bb;

[EdmScalarPropertyAttribute(IsNullable = false)]

[DataMemberAttribute()]

public string bb

{

get

{

return this._bb;

}

set

{

?

this.ReportPropertyChanging("bb");

this._bb = global::System.Data.Objects.DataClasses.StructuralObject.SetValidValue(value, false);

this.ReportPropertyChanged("bb");

?

}

}

?

?

//

private string _cc;

[EdmScalarProperty()]

[DataMember()]

public string cc

{

get

{

return this._cc;

}

set

{

this.ReportPropertyChanging("cc");

this._cc =StructuralObject.SetValidValue(value, true);

this.ReportPropertyChanged("cc");

}

}

//

private string _dd;

[EdmScalarProperty()]

[DataMember()]

public string dd

{

get

{

return this._dd;

}

set

{

this.ReportPropertyChanging("dd");

this._dd = StructuralObject.SetValidValue(value, true);

this.ReportPropertyChanged("dd");

}

}

?

}

myContext cn;

?

EntityConnection econ = new EntityConnection();

?

string s = @"

metadata=res://*/myModel.csdl

|res://*/myModel.ssdl

|res://*/myModel.msl

;

?

provider=System.Data.SqlClient;

?

provider connection string=""

Data Source=.;

Initial Catalog=LingTestDB;

Integrated Security=True;

MultipleActiveResultSets=True;

""

";

?

econ.ConnectionString = s;

?

cn = new myDate.myContext(econ);

?

this.dataGridView1.DataSource = cn.myTab;

myContext context = new myContext();

ObjectQuery<myTab> a = context.myTabSets;

ObjectQuery<myTabEx1> b = context.myTabSets.OfType<myTabEx1>();

ObjectQuery<myTabEx2> c = context.myTabSets.OfType<myTabEx2>();

從主鍵表訪問數據

myContext context = new myContext();

?

ObjectQuery<tab1> tab1_List = context.tab1;

?

?

foreach (tab1 tab1_Entity in tab1_List)

{

?

Console.WriteLine("{0},{1}", tab1_Entity.a, tab1_Entity.b);

?

EntityCollection<tab2> tab2_List = tab1_Entity.Nvtab2;

?

tab2_List.Load(); //加載外鍵數據

?

foreach (tab2 tab2_Entity in tab2_List)

{

Console.WriteLine("{0},{1},{2}", tab2_Entity.ID,tab2_Entity.x,tab2_Entity.y);

}

}

lzm ,456

3 ,5 ,6

4 ,7 ,8

wxd ,123

1 ,1 ,2

2 ,3 ,4

從外鍵表訪問數據

myContext context = new myContext();

ObjectQuery<tab2> tab2_List = context.tab2;

?

foreach (tab2 tab2_Entity in tab2_List)

{

Console.WriteLine("{0},{1},{2}", tab2_Entity.ID, tab2_Entity.x, tab2_Entity.y);

?

tab2_Entity.NVtab1Reference.Load(); //加載主鍵數據

?

tab1 tab1 = tab2_Entity.NVtab1;

?

Console.WriteLine("{0},{1}", tab1.a, tab1.b);

}

1 ,1 ,2

wxd ,123

2 ,3 ,4

wxd ,123

3 ,5 ,6

lzm ,456

4 ,7 ,8

lzm ,456

刪除主鍵

myContext context = new myContext();

var v = context.tab1.First(p => p.a == "wxd");

?

// 要刪除主鍵時,要保證內存中對應的外鍵數據為空

?

//v.Nvtab2.Load();

//if (v.Nvtab2.Count != 0)

//{

// List<tab2> list = new List<tab2>();

// foreach (var w in v.Nvtab2)

// {

// list.Add(w);

// }

// foreach (var ww in list)

// {

?

// context.DeleteObject(ww);

// }

//}

?

context.DeleteObject(v);

?

context.SaveChanges();

直接插入外鍵數據

myContext context = new myContext();

tab2 tab2 = new tab2();

?

tab2.ID = "101";

tab2.x = "555";

tab2.y = "666";

?

tab2.Nvtab1 = context.tab1.First(p => p.a == "wxd"); //要有主鍵信息

?

context.AddTotab2(tab2);

?

context.SaveChanges();

通過主鍵插入外鍵數據

myContext context = new myContext();

?

var tab1 = context.tab1.First(p => p.a == "wxd");

?

//第1條外鍵記錄

tab2 r1 = new tab2();

r1.ID = "103";

r1.x = "r1";

r1.y = "r1";

tab1.Nvtab2.Add(r1);

?

//第2條外鍵記錄

tab2 r2 = new tab2();

r2.ID = "104";

r2.x = "r1";

r2.y = "r1";

tab1.Nvtab2.Add(r2);

?

context.SaveChanges();

讀取

myContext context = new myContext();

?

ObjectQuery<tab1> tab1_List = context.tab1;

?

?

foreach (tab1 tab1_Entity in tab1_List)

{

?

Console.WriteLine("{0},{1}", tab1_Entity.a, tab1_Entity.b);

?

tab1_Entity.NVtab3Reference.Load(); //加載關聯數據

?

tab3 tab3 = tab1_Entity.NVtab3;

?

?

?

Console.WriteLine("{0},{1},{2}", tab3.a, tab3.m, tab3.n);

?

}

lzm ,456

lzm ,mmmm ,nnnn

wxd ,123

wxd ,nnn ,nnn

myContext context = new myContext();

?

ObjectQuery<tab3> tab3_List = context.tab3;

?

?

foreach (tab3 tab3_Entity in tab3_List)

{

?

Console.WriteLine("{0},{1},{2}", tab3_Entity.a, tab3_Entity.m,tab3_Entity.n );

?

tab3_Entity.NVtab1Reference.Load(); //加載關聯數據

?

tab1 tab1 = tab3_Entity.NVtab1;

?

?

?

Console.WriteLine("{0},{1}", tab1.a, tab1.b );

?

}

lzm ,mmmm ,nnnn

lzm ,456

wxd ,nnn ,nnn

wxd ,123

刪除

myContext context = new myContext();

?

var tab3 = context.tab3.First(p => p.a == "wxd");

?

//-要按順序

?

tab3.NVtab1Reference.Load(); // 加載關聯數據

?

context.DeleteObject(tab3.NVtab1); //刪除關聯數據

?

context.DeleteObject(tab3); // 刪除

?

//

context.SaveChanges();

插入

myContext context = new myContext();

?

tab1 tab1 = new tab1();

tab1.a = "wxwinter";

tab1.b = "789";

?

//關聯

tab1.NVtab3 = new tab3();

tab1.NVtab3.a = "wxwinter";

tab1.NVtab3.m = "mm";

tab1.NVtab3.n = "mm";

?

context.AddTotab1(tab1);

?

context.SaveChanges();

得到數據

myContext context = new myContext();

?

ObjectQuery<部門表> bList = context.部門表;

?

foreach (部門表 b in bList)

{

Console.WriteLine("{0},{1}", b.部門, b.部門說明);

?

b.場地表.Load();

?

EntityCollection<場地表> cList = b.場地表;

?

foreach (場地表 c in cList)

{

Console.WriteLine("{0},{1}", c.場地, c.場地說明);

}

}

丙 ,1

a ,11

b ,22

c ,33

甲 ,2

a ,11

乙 ,3

a ,11

b ,22

myContext context = new myContext();

?

ObjectQuery<場地表> cList = context.場地表;

?

foreach (場地表 c in cList)

{

Console.WriteLine("{0},{1}", c.場地, c.場地說明);

?

c.部門表.Load();

?

EntityCollection<部門表> bList = c.部門表;

?

foreach (部門表 b in bList)

{

Console.WriteLine("{0},{1}", b.部門, b.部門說明);

}

}

a ,11

丙 ,1

甲 ,2

乙 ,3

b ,22

丙 ,1

乙 ,3

c ,33

丙 ,1

刪除數據

myContext context = new myContext();

?

場地表 c = context.場地表.First(p => p.場地 == "a");

?

?

//1.如果加載關聯數據,[中轉表]中的關聯數據也會被刪除,

//2.如果不加載關聯數據,將不會刪除[中轉表]中的關聯數據

?

//c.部門表.Load(); // <-------[是/否]

?

?

context.DeleteObject(c);

context.SaveChanges();

添加數據

myContext context = new myContext();

?

場地表 c = new 場地表();

c.場地 = "d";

c.場地說明 = "44";

context.AddTo場地表(c);

context.SaveChanges();

同時添加數據到

[源表],

[關聯表],

[中轉表]

//可以將數據同時添加[源表],[關聯表],[中轉表]

myContext context = new myContext();

?

場地表 c = new 場地表();

c.場地 = "e";

c.場地說明 = "55";

c.部門表.Add(new 部門表() { 部門 = "vv", 部門說明 = "vv" });

context.AddTo場地表(c);

context.SaveChanges();

查詢

PRSelectDBItem

CREATE PROCEDURE PRSelectDBItem

@v nvarchar(50)

?

as

select * from DBItem where ItemID=@v

myContext context = new myContext();

?

ObjectResult<DBItem> dbitemList= context.PRSelectDBITem("a");

?

foreach (var r in dbitemList)

{

Console.WriteLine("{0},{1}", r.ItemID, r.ItemMatter);

}

public class Context :ObjectContext

{

public Context() : base("name=myContext", "myContext")

{ }

public ObjectResult<DBItem> PRSelectDBITem(string v)

{

return base.ExecuteFunction<DBItem>("PRSelectDBITem", new ObjectParameter("v", v));

}

}

Context context = new Context();

?

ObjectResult<DBItem> dbitemList = context.PRSelectDBITem("a");

?

foreach (var r in dbitemList)

{

Console.WriteLine("{0},{1}", r.ItemID, r.ItemMatter);

}

插入

PRinsertDBItem

CREATE PROCEDURE PRinsertDBItem

@ItemID nvarchar(50),

@ItemMatter nvarchar(50)

?

as

insert into DBItem (ItemID,ItemMatter) values (@ItemID ,@ItemMatter)

string econString = @"

metadata=res://*/myModel.csdl

|res://*/myModel.ssdl

|res://*/myModel.msl

;

?

provider=System.Data.SqlClient;

?

provider connection string=""

Data Source=.;

Initial Catalog=LingTestDB;

Integrated Security=True;

MultipleActiveResultSets=True;

""

";

?

?

EntityConnection econ = new EntityConnection();

econ.ConnectionString = econString;

?

?

?

EntityCommand ecmd = new EntityCommand();

?

ecmd.CommandType = CommandType.Text;

?

ecmd.Connection = econ;

?

ecmd.CommandText = "myContext.PRinsertDBItem";

?

ecmd.CommandType = CommandType.StoredProcedure;

?

?

?

EntityParameter p1 = new EntityParameter("ItemID", System.Data.DbType.String);

p1.Value = "aaa";

?

EntityParameter p2 = new EntityParameter("ItemMatter", System.Data.DbType.String);

p2.Value = "bbb";

?

?

ecmd.Parameters.Add(p1);

?

ecmd.Parameters.Add(p2);

?

?

econ.Open();

?

ecmd.ExecuteNonQuery();

算加法

PRadd

CREATE PROCEDURE PRadd

@x int = 0,

@y int = 0,

@s int = 0 output

?

as

set @s= @x * @y

string econString = @"

metadata=res://*/myModel.csdl

|res://*/myModel.ssdl

|res://*/myModel.msl

;

?

provider=System.Data.SqlClient;

?

provider connection string=""

Data Source=.;

Initial Catalog=LingTestDB;

Integrated Security=True;

MultipleActiveResultSets=True;

""

";

?

?

EntityConnection econ = new EntityConnection();

econ.ConnectionString = econString;

?

?

?

EntityCommand ecmd = new EntityCommand();

?

ecmd.CommandType = CommandType.Text;

?

ecmd.Connection = econ;

?

ecmd.CommandText = "myContext.PRadd";

?

ecmd.CommandType = CommandType.StoredProcedure;

?

?

?

EntityParameter p1 = new EntityParameter("x", System.Data.DbType.Int32);

p1.Value = 123;

?

EntityParameter p2 = new EntityParameter("y", System.Data.DbType.Int32);

p2.Value = 456;

?

?

EntityParameter rt = new EntityParameter("s",

System.Data.DbType.Int32,

0,

ParameterDirection.Output,

false,

0,

0,

"",

DataRowVersion.Current,

0);

?

ecmd.Parameters.Add(p1);

?

ecmd.Parameters.Add(p2);

ecmd.Parameters.Add(rt);

?

?

econ.Open();

?

ecmd.ExecuteNonQuery();

?

Console.WriteLine(rt.Value); //579