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
}

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);
}
}
}

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));
}
}

}
}

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
}
}
}

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;
}
}
}