Windows Phone 7 本地数据库SQL Server CE（芒果更新）
在
Windows Phone
的第一个版本
7.0
版本里面是没有本地数据库支持的，要使用数据库只能够使用第三方的数据库组件。
Windows Phone
的本地数据库
SQL Server CE
是
7.1
版本即芒果更新的新特性，所以你要在应用程序中使用
SQL Server CE
数据库必须使用
Windows Phone 7.1
的
API
才行。
下面用一个实例演示如何使用SQL Server CE数据库。
（1）创建数据表以及数据库的数据上下文DateContent
先创建一个员工信息表，用于保存员工的名字和简介，员工表有一个自增的ID。
EmployeeTable.cs
using
System.Data.Linq.Mapping;
using
System.ComponentModel;
namespace
SQLServerDemo
{
[Table]
public
class
EmployeeTable : INotifyPropertyChanged, INotifyPropertyChanging
{
//
定义员工表独立增长ID，设置为主键
private
int
_employeeId;
[Column(IsPrimaryKey
=
true
, IsDbGenerated
=
true
, DbType
=
"
INT NOT NULL Identity
"
, CanBeNull
=
false
, AutoSync
=
AutoSync.OnInsert)]
public
int
EmployeeID
{
get
{
return
_employeeId;
}
set
{
if
(_employeeId
!=
value)
{
NotifyPropertyChanging(
"
EmployeeID
"
);
_employeeId
=
value;
NotifyPropertyChanged(
"
EmployeeID
"
);
}
}
}
//
定义员工名字字段
private
string
_employeeName;
[Column]
public
string
EmployeeName
{
get
{
return
_employeeName;
}
set
{
if
(_employeeName
!=
value)
{
NotifyPropertyChanging(
"
EmployeeName
"
);
_employeeName
=
value;
NotifyPropertyChanged(
"
EmployeeName
"
);
}
}
}
//
定义员工简介字段
private
string
_employeeDesc;
[Column]
public
string
EmployeeDesc
{
get
{
return
_employeeDesc;
}
set
{
if
(_employeeDesc
!=
value)
{
NotifyPropertyChanging(
"
EmployeeDesc
"
);
_employeeDesc
=
value;
NotifyPropertyChanged(
"
EmployeeDesc
"
);
}
}
}
#region
INotifyPropertyChanged Members
public
event
PropertyChangedEventHandler PropertyChanged;
//
用来通知页面表的字段数据产生了改变
private
void
NotifyPropertyChanged(
string
propertyName)
{
if
(PropertyChanged
!=
null
)
{
PropertyChanged(
this
,
new
PropertyChangedEventArgs(propertyName));
}
}
#endregion
#region
INotifyPropertyChanging Members
public
event
PropertyChangingEventHandler PropertyChanging;
//
用来通知数据上下文表的字段数据将要产生改变
private
void
NotifyPropertyChanging(
string
propertyName)
{
if
(PropertyChanging
!=
null
)
{
PropertyChanging(
this
,
new
PropertyChangingEventArgs(propertyName));
}
}
#endregion
}
}
创建数据库的DataContent，
定义一个
EmployeeDataContext
类来继承
DataContext
，在
EmployeeDataContext
中定义数据库连接字符串，以及员工信息表。
EmployeeDataContext.cs
using
System.Data.Linq;
namespace
SQLServerDemo
{
public
class
EmployeeDataContext : DataContext
{
//
数据库链接字符串
public
static
string
DBConnectionString
=
"
Data Source=isostore:/Employee.sdf
"
;
//
传递数据库连接字符串到DataContext基类
public
EmployeeDataContext(
string
connectionString)
:
base
(connectionString)
{ }
//
定义一个员工信息表
public
Table
<
EmployeeTable
>
Employees;
}
}
（2） 创建页面数据绑定的集合
EmployeeCollection.cs
using
System.ComponentModel;
using
System.Collections.ObjectModel;
namespace
SQLServerDemo
{
//
EmployeeCollection用于跟页面的数据绑定
public
class
EmployeeCollection : INotifyPropertyChanged
{
//
定义ObservableCollection来绑定页面的数据
private
ObservableCollection
<
EmployeeTable
>
_employeeTables;
public
ObservableCollection
<
EmployeeTable
>
EmployeeTables
{
get
{
return
_employeeTables;
}
set
{
if
(_employeeTables
!=
value)
{
_employeeTables
=
value;
NotifyPropertyChanged(
"
EmployeeTables
"
);
}
}
}
#region
INotifyPropertyChanged Members
public
event
PropertyChangedEventHandler PropertyChanged;
//
用于通知属性的改变
private
void
NotifyPropertyChanged(
string
propertyName)
{
if
(PropertyChanged
!=
null
)
{
PropertyChanged(
this
,
new
PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
}
（3）创建数据库，绑定数据，实现员工信息表的增删改查操作。
在App.xaml.cs中的程序加载事件中进行创建数据库
private
void
Application_Launching(
object
sender, LaunchingEventArgs e)
{
//
如果数据库不存在则创建一个数据库
using
(EmployeeDataContext db
=
new
EmployeeDataContext(EmployeeDataContext.DBConnectionString))
{
if
(db.DatabaseExists()
==
false
)
{
//
创建一个数据库
db.CreateDatabase();
}
}
}
MainPage.xaml文件代码
<
phone:PhoneApplicationPage
x:Class
="SQLServerDemo.MainPage"
xmlns
="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x
="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone
="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell
="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d
="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc
="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable
="d"
d:DesignWidth
="480"
d:DesignHeight
="768"
FontFamily
="
{StaticResource PhoneFontFamilyNormal}
"
FontSize
="
{StaticResource PhoneFontSizeNormal}
"
Foreground
="
{StaticResource PhoneForegroundBrush}
"
SupportedOrientations
="Portrait"
Orientation
="Portrait"
shell:SystemTray.IsVisible
="True"
>
<
Grid
x:Name
="LayoutRoot"
Background
="Transparent"
>
<
Grid.RowDefinitions
>
<
RowDefinition
Height
="Auto"
/>
<
RowDefinition
Height
="*"
/>
</
Grid.RowDefinitions
>
<
StackPanel
x:Name
="TitlePanel"
Grid.Row
="0"
Margin
="12,17,0,28"
>
<
TextBlock
x:Name
="ApplicationTitle"
Text
="MY APPLICATION"
Style
="
{StaticResource PhoneTextNormalStyle}
"
/>
<
TextBlock
x:Name
="PageTitle"
Text
="SQL Server"
Margin
="9,-7,0,0"
Style
="
{StaticResource PhoneTextTitle1Style}
"
/>
</
StackPanel
>
<
Grid
x:Name
="ContentPanel"
Grid.Row
="1"
Margin
="12,0,12,0"
>
<
Grid
Margin
="0,0,0,385"
>
<
Grid.ColumnDefinitions
>
<
ColumnDefinition
Width
="*"
/>
<
ColumnDefinition
Width
="Auto"
/>
</
Grid.ColumnDefinitions
>
<
TextBlock
FontSize
="30"
Height
="37"
HorizontalAlignment
="Left"
Margin
="12,18,0,0"
Name
="textBlock1"
Text
="员工名字:"
VerticalAlignment
="Top"
/>
<
TextBox
Name
="name"
Text
=""
Margin
="145,0,6,144"
/>
<
TextBlock
FontSize
="30"
Height
="52"
HorizontalAlignment
="Left"
Margin
="18,74,0,0"
Name
="textBlock2"
Text
="简介："
VerticalAlignment
="Top"
/>
<
TextBox
Height
="79"
HorizontalAlignment
="Left"
Margin
="93,65,0,0"
Name
="desc"
Text
=""
VerticalAlignment
="Top"
Width
="357"
/>
<
Button
Content
="保存"
x:Name
="addButton"
Click
="addButton_Click"
Margin
="219,132,6,6"
/>
</
Grid
>
<
ListBox
x:Name
="toDoItemsListBox"
ItemsSource
="
{Binding EmployeeTables}
"
Margin
="12,241,12,0"
Width
="440"
>
<
ListBox.ItemTemplate
>
<
DataTemplate
>
<
Grid
HorizontalAlignment
="Stretch"
Width
="440"
>
<
Grid.ColumnDefinitions
>
<
ColumnDefinition
Width
="50"
/>
<
ColumnDefinition
Width
="*"
/>
<
ColumnDefinition
Width
="100"
/>
</
Grid.ColumnDefinitions
>
<
TextBlock
Text
="
{Binding EmployeeName}
"
FontSize
="
{StaticResource PhoneFontSizeLarge}
"
Grid.Column
="1"
VerticalAlignment
="Center"
/>
<
Button
Grid.Column
="2"
x:Name
="deleteButton"
BorderThickness
="0"
Margin
="0"
Click
="deleteButton_Click"
Content
="删除"
>
</
Button
>
<
Button
Grid.Column
="1"
x:Name
="editButton"
BorderThickness
="0"
Margin
="209,0,81,0"
Click
="editButton_Click"
Content
="编辑"
Grid.ColumnSpan
="2"
>
</
Button
>
</
Grid
>
</
DataTemplate
>
</
ListBox.ItemTemplate
>
</
ListBox
>
</
Grid
>
</
Grid
>
</
phone:PhoneApplicationPage
>
MainPage.xaml.cs
文件代码
using
System.Linq;
using
System.Windows;
using
System.Windows.Controls;
using
Microsoft.Phone.Controls;
using
System.Collections.ObjectModel;
namespace
SQLServerDemo
{
public
partial
class
MainPage : PhoneApplicationPage
{
//
创建DataContext实例用于用于操作本地的数据库
private
EmployeeDataContext employeeDB;
private
EmployeeCollection employeeCol
=
new
EmployeeCollection();
public
MainPage()
{
InitializeComponent();
//
连接数据库并初始化DataContext实例
employeeDB
=
new
EmployeeDataContext(EmployeeDataContext.DBConnectionString);
//
使用Linq查询语句查询EmployeeTable表的所有数据
var employeesInDB
=
from EmployeeTable employee
in
employeeDB.Employees
select employee;
//
将查询的结果返回到页面数据绑定的集合里面
employeeCol.EmployeeTables
=
new
ObservableCollection
<
EmployeeTable
>
(employeesInDB);
//
赋值给当前页面的DataContext用于数据绑定
this
.DataContext
=
employeeCol;
}
///
<summary>
///
删除操作
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
private
void
deleteButton_Click(
object
sender, RoutedEventArgs e)
{
//
获取单击的按钮实例
var button
=
sender
as
Button;
if
(button
!=
null
)
{
//
获取当前按钮绑定的DataContext，即当前的删除的EmployeeTable实例
EmployeeTable employeeForDelete
=
button.DataContext
as
EmployeeTable;
//
移除绑定集合里面要删除的EmployeeTable记录
employeeCol.EmployeeTables.Remove(employeeForDelete);
//
移除数据库里面要删除的EmployeeTable记录
employeeDB.Employees.DeleteOnSubmit(employeeForDelete);
//
保存数据库的改变
employeeDB.SubmitChanges();
}
}
///
<summary>
///
保存操作，处理新增和编辑员工信息
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
private
void
addButton_Click(
object
sender, RoutedEventArgs e)
{
//
控制员工名字和简介不能为空
if
(name.Text
!=
""
&&
desc.Text
!=
""
)
{
if
(State.Count
>
0
&&
State[
"
employee
"
]
!=
null
)
//
编辑状态
{
//
获取编辑的EmployeeTable对象
EmployeeTable employee
=
(EmployeeTable)State[
"
employee
"
];
employee.EmployeeName
=
name.Text;
employee.EmployeeDesc
=
desc.Text;
//
保存数据库的改变
employeeDB.SubmitChanges();
//
添加绑定集合的数据,因为在单击编辑的时候移除了
employeeCol.EmployeeTables.Add(employee);
State[
"
employee
"
]
=
null
;
}
else
//
新增状态
{
//
创建一条表的数据
EmployeeTable newEmployee
=
new
EmployeeTable { EmployeeName
=
name.Text, EmployeeDesc
=
desc.Text };
//
添加绑定集合的数据
employeeCol.EmployeeTables.Add(newEmployee);
//
插入数据库
employeeDB.Employees.InsertOnSubmit(newEmployee);
//
保存数据库的改变
employeeDB.SubmitChanges();
}
name.Text
=
""
;
desc.Text
=
""
;
}
else
{
MessageBox.Show(
"
姓名和简介不能为空！
"
);
}
}
///
<summary>
///
编辑操作
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
private
void
editButton_Click(
object
sender, RoutedEventArgs e)
{
//
获取单击的按钮实例
var button
=
sender
as
Button;
if
(button
!=
null
)
{
//
获取当前按钮绑定的DataContext，即当前的编辑的EmployeeTable实例
EmployeeTable employeeForEdit
=
button.DataContext
as
EmployeeTable;
name.Text
=
employeeForEdit.EmployeeName;
desc.Text
=
employeeForEdit.EmployeeDesc;
//
将需要编辑的表实例存储在State里面
State[
"
employee
"
]
=
employeeForEdit;
employeeCol.EmployeeTables.Remove(employeeForEdit);
}
}
}
}
运行效果如下：
