== 菜鳥級選手試驗在EF6中使用Sqlite，零EF基礎，少量Sqlite基礎。經過斷斷續續的很長時間 - _ -！
>>連接
1. 安裝
使用目前最新版本EF6.1，Sqlite1.0.93.0。直接NuGet安裝：
2. 配置
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<?xml version=
"1.0"
encoding=
"utf-8"
?>
<configuration>
<configSections>
<section name=
"entityFramework"
type=
"System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
requirePermission=
"false"
/>
<!-- For more information on Entity Framework configuration, visit http:
//go.microsoft.com/fwlink/?LinkID=237468 -->
</configSections>
<startup>
<supportedRuntime version=
"v4.0"
sku=
".NETFramework,Version=v4.5"
/>
</startup>
<connectionStrings>
<add name=
"SqlliteEF6"
connectionString=
"Data Source=Data\EF6.db"
providerName=
"System.Data.SQLite"
/>
</connectionStrings>
<entityFramework>
<providers>
<provider invariantName=
"System.Data.SQLite"
type=
"System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6"
/>
<provider invariantName=
"System.Data.SQLite.EF6"
type=
"System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6"
/>
</providers>
<defaultConnectionFactory type=
"System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework"
>
<parameters>
<parameter value=
"v11.0"
/>
</parameters>
</defaultConnectionFactory>
</entityFramework>
<system.data>
<DbProviderFactories>
<remove invariant=
"System.Data.SQLite"
/>
<add name=
"SQLite Data Provider"
invariant=
"System.Data.SQLite"
description=
"Data Provider for SQLite"
type=
"System.Data.SQLite.SQLiteFactory, System.Data.SQLite"
/>
<remove invariant=
"System.Data.SQLite.EF6"
/>
<add name=
"SQLite Data Provider (Entity Framework 6)"
invariant=
"System.Data.SQLite.EF6"
description=
".Net Framework Data Provider for SQLite (Entity Framework 6)"
type=
"System.Data.SQLite.EF6.SQLiteProviderFactory, System.Data.SQLite.EF6"
/>
</DbProviderFactories>
</system.data>
</configuration>
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3. 設置數據庫
EF中數據庫操作繼承DBContext。需要指定數據連接，名稱和config配置一致，否則默認使用Sqlserver。
SQLite可以重載創建。
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public
class
EF6Context : DbContext
{
public
EF6Context(
string
databaseName =
"SqlliteEF6"
)
:
base
(databaseName)
{
}
public
DbSet<User> Users {
set
;
get
; }
protected
override
void
OnModelCreating(DbModelBuilder modelBuilder)
{}
}
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>>注意事項
1. Sqlite中不能自動創建數據庫和新建表，需要額外的操作
>> 數據類型插入獲取
1. 自增ID
Sqlite中需要設置AUTOINCREMENT，如下：
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Id
INTEGER
PRIMARY
KEY
AUTOINCREMENT,
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需要引用System.ComponentModel.DataAnnotations，System.ComponentModel.DataAnnotations.Schema，類中寫明
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[Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public
Int64 Id {
get
;
set
; }
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2. 限定Table
默認數據庫獲取為DBContext中定義的名稱，限定對應的Table，需要在類上指明，如下：
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[Table(
"User"
)]
public
class
User
{...
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3. 枚舉型
目前直接能使用，注意需要在定義表時限定不能為NULL,否則為NULL時獲取會報錯。定義時如下定義：
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public
enum
TestENUM :
long
{ A, B, C };
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4. 其它
目前SQlite中支持浮點數、時間、二進制數據、字符串等。創建表示例：
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NorthwindContext context =
new
NorthwindContext();
string
sql =
@" CREATE TABLE User (
Id INTEGER PRIMARY KEY AUTOINCREMENT,
Name varchar (20),
Time timestamp,
Data blob,
Val REAL,
TestE INTEGER);"
;
context.Database.ExecuteSqlCommand(sql,
new
object
[1]);
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定義類示例：
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[Table(
"User"
)]
public
class
User
{
public
enum
TestENUM :
long
{ A, B, C };
[Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public
Int64 Id {
get
;
set
; }
[StringLength(30)]
public
string
Name {
get
;
set
; }
public
byte
[] Data {
get
;
set
; }
public
double
Val {
get
;
set
; }
public
DateTime Time {
get
;
set
; }
public
TestENUM TestE {
get
;
set
; }
}
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public
class
EF6Context : DbContext
{
public
EF6Context(
string
databaseName =
"SqlliteEF6"
)
:
base
(databaseName)
{
}
public
DbSet<User> Users {
set
;
get
; }
protected
override
void
OnModelCreating(DbModelBuilder modelBuilder)
{}
}
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調用示例：
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NorthwindContext context =
new
NorthwindContext();
context.Users.Add(
new
User() { Data =
new
byte
[] { 1, 2, 3, 4 }, Name =
"aa22"
, Time = DateTime.Now, Val = 2.2,
TestE
= User.TestENUM.B });
context.SaveChanges();
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NorthwindContext context =
new
NorthwindContext();
context.Users.OrderBy(c => c.Name).Load();
this
.dataGrid.ItemsSource = context.Users.Local;
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以上代碼測試正常。源碼下載