Windows Phone 7 使用Perst数据库的Demo——流水账

   在Windows Phone 7程序项目中使用Perst，需要引用PerstWP7.dll，dll文件可以到Perst的官方网站上下载。这个perst数据库的demo简单地实现了记账保存功能和流水账查询的功能，旨在用最简单最简洁的代码在Windows Phone 7上使用Perst数据库。

程序截图如下：

先从App.xaml文件说起

因为数据库对象是相对于整个程序来说的，所以一般会在App.xaml.cs中进行创建 初始化和关闭

App.xaml.cs

        public Database Database { get; internal set; }  //定义一个数据库对象


        internal void ClosePerstDatabase()
        {
            if (Database != null && Database.Storage != null)
                Database.Storage.Close();//关闭数据库存储
        }

        public App()
        {
            InitializePerstStorage();
            ……
         }

        internal void InitializePerstStorage()
        {
            Storage storage = StorageFactory.Instance.CreateStorage(); //创建Perst存储Storage实例
            storage.SetProperty("perst.file.extension.quantum", 512 * 1024); //初始化存储大小为512KB
            storage.SetProperty("perst.extension.quantum", 256 * 1024); //每次递增的存储大小为 256KB 

            storage.Open("PerstDemoDB.dbs", 0); // 打开Storage

            //使用上面初始化的Storage实例创建数据库
            Database = new Database(storage, false, true, new FullTextSearchHelper(storage));
            //Database =new Perst.Database(
            Database.EnableAutoIndices = false; //关闭自动索引 即使用人工索引
        }

        private void Application_Closing(object sender, ClosingEventArgs e)
        {
            ClosePerstDatabase();//关闭数据库
        }

再来看看 ViewModel的文件

Account.cs

using System.ComponentModel;
using System.Linq;
using System.Globalization;
using Perst.FullText;
using System.Collections.Generic;
using System;
using Perst;

namespace PerstDemo.ViewModel
{
    public class Account : Persistent, INotifyPropertyChanged
    {
        [FullTextIndexable]//FullTextIndexable定义为索引
        public string inOrOut;  //收入或者支出
        [FullTextIndexable]
        public string time;  //时间
        [FullTextIndexable]
        public string money;  //多少钱
        [FullTextIndexable]
        public string description;  //描述

        public override void OnLoad()
        {
            base.OnLoad();
        }

        public string InOrOut
        {
            get { return inOrOut; }
            set
            {
                inOrOut = value;
                InvokePropertyChanged(new PropertyChangedEventArgs("InOrOut"));
            }
        }

        public string Time
        {
            get { return time; }
            set
            {
                time = value;
                InvokePropertyChanged(new PropertyChangedEventArgs("Time"));
            }
        }

        public string Money
        {
            get { return money; }
            set
            {
                money = value;
                InvokePropertyChanged(new PropertyChangedEventArgs("Money"));
            }
        }

        public string Description
        {
            get { return description; }
            set
            {
                this.description = value;
                InvokePropertyChanged(new PropertyChangedEventArgs("Description"));
            }
        }

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        #endregion

        //删除对象的数据
        public override void Deallocate()
        {
            base.Deallocate();
        }

        private void InvokePropertyChanged(PropertyChangedEventArgs e)
        {
            var handler = PropertyChanged;
            if (handler != null) handler(this, e);
        }
    }
}

AccountsViewModel.cs

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.ComponentModel;
using System.Collections.ObjectModel;
using Perst;

namespace PerstDemo.ViewModel
{
    public class AccountsViewModel : INotifyPropertyChanged
    {
        public AccountsViewModel()
        {
            Accounts = new ObservableCollection<Account>();

            //从数据库中获取所有的Account记录
            if (Database != null)
            {
                //数据库查询 查询出Account类（相当于表）的所有对象  通过时间进行排序
                Accounts = Database.Select<Account>("order by Time").ToObservableCollection(); // Load them but sorted  
            }
        }

        public ObservableCollection<Account> Accounts { get; private set; }

        private static Database Database
        {
            get { return ((App)Application.Current).Database; }
        }

        private static Storage Storage
        {
            get { return Database.Storage; }
        }

        public event PropertyChangedEventHandler PropertyChanged;
        private void NotifyPropertyChanged(String propertyName)
        {
            if (null != PropertyChanged)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

    }
}

流水账页面  绑定数据库Account表的所有记录

<phone:PhoneApplicationPage 
    x:Class="PerstDemo.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="696"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True"
    xmlns:vm="clr-namespace:PerstDemo.ViewModel"
>



            <!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!--TitlePanel contains the name of the application and page title-->
        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
            <TextBlock x:Name="PageTitle" Text="流水账" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
        </StackPanel>

        <!--ContentPanel - place additional content here-->
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <ListBox x:Name="AccountsListBox" Grid.Row="1"  >
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel x:Name="DataTemplateStackPanel" Orientation="Horizontal">
                            <StackPanel>
                                <StackPanel Orientation="Horizontal">
                                    <TextBlock x:Name="inout" Text="{Binding InOrOut}" Margin="0,0,0,0" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
                                    <TextBlock x:Name="money" Text="{Binding Money}" Margin="10,0,0,5" VerticalAlignment="Bottom"  Style="{StaticResource PhoneTextNormalStyle}"/>
                                    <TextBlock x:Name="time" Text="{Binding Time}" Margin="70,0,0,0" VerticalAlignment="Bottom"  Style="{StaticResource PhoneTextNormalStyle}"/>
                                </StackPanel>
                                <TextBlock x:Name="DetailsText" Text="{Binding Description}" Margin="0,-6,0,3" Style="{StaticResource PhoneTextAccentStyle}"/>
                            </StackPanel>
                        </StackPanel>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </Grid>
    </Grid>
    <phone:PhoneApplicationPage.ApplicationBar>
        <shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
            <shell:ApplicationBar.MenuItems>
                <shell:ApplicationBarMenuItem Text="记一笔账" Click="New_Click"/>
            </shell:ApplicationBar.MenuItems>
        </shell:ApplicationBar>
    </phone:PhoneApplicationPage.ApplicationBar>


</phone:PhoneApplicationPage>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using PerstDemo.ViewModel;
using Perst;
using System.Collections.ObjectModel;

namespace PerstDemo
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
            this.AccountsListBox.ItemsSource =  new AccountsViewModel().Accounts;
        }

        private void New_Click(object sender, EventArgs e)
        {
            NavigationService.Navigate(new Uri("/AddAccount.xaml", UriKind.Relative));
        }
    }
}

记账页面  添加一条Account表的记录

AddAccount.xaml

<phone:PhoneApplicationPage 
    x:Class="PerstDemo.AddAccount"
    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"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    mc:Ignorable="d" d:DesignHeight="768" d:DesignWidth="480"
    shell:SystemTray.IsVisible="True">

    <!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!--TitlePanel contains the name of the application and page title-->
        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
            <TextBlock x:Name="PageTitle" Text="记账" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
        </StackPanel>

        <!--ContentPanel - place additional content here-->
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <RadioButton Content="收入" Height="92" HorizontalAlignment="Left" Margin="62,29,0,0" Name="income" FontSize="30" VerticalAlignment="Top" />
            <RadioButton Content="支出" Height="92" HorizontalAlignment="Left" Margin="256,29,0,0" Name="outgo" FontSize="30" VerticalAlignment="Top" />
            <TextBlock Height="43" HorizontalAlignment="Left" Margin="23,169,0,0" Name="textBlock1" Text="金额" FontSize="30" VerticalAlignment="Top" Width="100" />
            <TextBox Height="72" HorizontalAlignment="Left" Margin="115,152,0,0" Name="money" Text="" VerticalAlignment="Top" Width="312" />
            <TextBlock FontSize="30" Height="43" HorizontalAlignment="Left" Margin="19,250,0,0" Name="textBlock2" Text="备注" VerticalAlignment="Top" Width="100" />
            <TextBox Height="72" HorizontalAlignment="Left" Margin="115,234,0,0" Name="desc" Text="" VerticalAlignment="Top" Width="312" />
            <TextBlock FontSize="30" Height="43" HorizontalAlignment="Left" Margin="19,344,0,0" Name="textBlock3" Text="时间" VerticalAlignment="Top" Width="100" />
            <TextBox Height="72" HorizontalAlignment="Left" Margin="115,330,0,0" Name="time" Text="" VerticalAlignment="Top" Width="312" />
            <Button  FontSize="40" Content="保存" Height="111" HorizontalAlignment="Left" Margin="43,466,0,0" Name="button1" VerticalAlignment="Top" Width="384" Click="button1_Click" />
        </Grid>
    </Grid>

</phone:PhoneApplicationPage>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using Perst;
using PerstDemo.ViewModel;

namespace PerstDemo
{
    public partial class AddAccount : PhoneApplicationPage
    {
        public AddAccount()
        {
            InitializeComponent();
        }
//保存记录
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            Database Database = ((App)App.Current).Database;//获取在App中定义的数据库对象
            string inorout = "支出";
            if (this.income.IsChecked != null && this.income.IsChecked == true)
            {
               inorout = "收入";
            }
            //初始化一个表对象
            Account tem1 = new Account { InOrOut = inorout, Money = this.money.Text, Description = this.desc.Text,Time=this.time.Text };
            Database.AddRecord(tem1);//添加数据库记录
            Database.Storage.Commit();//关闭数据库存储
            NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));//跳转到首页的流水账显示
        }
    }
}

因为查询的记录的结果是 IEnumerable<T>类型  数据绑定使用了ObservableCollection<T>类型  所用需要转换一下

Utilities.cs

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Collections.ObjectModel;
using System.Collections.Generic;

namespace PerstDemo
{
    public static class Utilities
    {   //将IEnumerable<T>转化为ObservableCollection<T>   用于数据绑定
        public static ObservableCollection<T> ToObservableCollection<T>(this IEnumerable<T> source)
        {
            var collection = new ObservableCollection<T>();
            foreach (var acount in source)
                collection.Add(acount);
            return collection;
        }
    }
}