/// <summary>
/// 更新 添加
/// </summary>
public static bool Update <TSource>(TSource t)
{
using (XDatabase db = XDatabase.Open(baseDir)) {
db.Store(t);
return(true);
}
return(false);
}
public static bool Delete <TSource>(TSource t)
{
using (XDatabase db = XDatabase.Open(baseDir)) {
var query = db.Query <TSource>();
if (query != null)
{
db.Delete(t);
return(true);
}
}
return(false);
}
public static bool Delete <TSource>(Func <TSource, bool> predicate)
{
using (XDatabase db = XDatabase.Open(baseDir)) {
var query = db.Query <TSource>();
if (query != null)
{
var model = query.Where <TSource>(predicate).SingleOrDefault();
db.Delete(model);
return(true);
}
}
return(false);
}
/// <summary>
/// 数据获取
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <param name="predicate"></param>
/// <returns></returns>
public static List <TSource> GetList <TSource>(Func <TSource, bool> predicate)
{
List <TSource> list = new List <TSource>();
using (XDatabase db = XDatabase.Open(baseDir)) {
var query = db.Query <TSource>();
if (query != null)
{
list = query.Where <TSource>(predicate).ToList();
}
}
return(list);
}
/// <summary>
/// 更新 添加
/// </summary>
public static bool Update <TSource>(TSource t)
{
using (XDatabase db = XDatabase.Open(baseDir)) {
db.Store(t);
return(true);
//var query = db.Query<TSource>();
//if (query != null) {
// db.Store(t);
// return true;
//}
}
return(false);
}
protected void Page_Load(object sender, EventArgs e)
{
using (var db = XDatabase.Open(Server.MapPath("~/test")))
{
var data = new Employee()
{
EmployeeId = 1,
FirstName = "ares",
LastName = "chen",
Title = "CEO"
};
db.Store(data);
gd.DataSource = db.Query <Employee>();
gd.DataBind();
}
}
static void Main(string[] args)
{
//这个程序演示了XmlDatabase的简单使用方式.注意，目前的版本是alpha，后续可能还会有所更改
//第一步：创建或者打开一个数据库
using (XDatabase db = XDatabase.Open("Test"))
{
//如果要重定向日志输出，请使用下面的语法即可
db.Log = Console.Out;
#region //第二步：创建几个数据实体类型.
//值得说明一下，这些数据实体类型没有任何特殊的要求，不需要添加任何的Attribute。但最好是遵守以下的两条简单的规则
//1.属性都是可读可写的，都是Public的
//2.重写ToString方法，这是为了让引擎在做日志记录的时候用的
Customer customer = new Customer()
{
CustomerID = "ALFKI",
CompanyName = "Alfreds Futterkiste",
Country = "Germany",
Region = "BC",
City = "Berlin",
ContactName = "Maria Anders",
Address = "Obere Str. 57"
};
Employee employee = new Employee()
{
EmployeeId = 1,
FirstName = "Nancy",
LastName = "Davolio",
Title = "Sales Representative"
};
Product product = new Product()
{
ProductId = 1,
ProductName = "Chai"
};
Order Order = new Order()
{
OrderID = 10248,
OrderDate = DateTime.Now,
Customer = customer,
Employee = employee,
OrderItems = new List <OrderItem>()
{
new OrderItem()
{
Product = product,
UnitPrice = 20.5m,
Quantity = 3
},
new OrderItem()
{
Product = new Product()
{
ProductId = 2,
ProductName = "Grandma's Boysenberry Spread"
},
UnitPrice = 333,
Quantity = 1
}
}
};
#endregion
//第三步：插入对象
db.Store(Order);//只要调用该方法就可以了。默认情况下，这是立即生效的
//第四步：读取对象 （这里还可以做任何的LINQ查询操作）
var query = from o in db.Query <Order>()
where o.OrderID == 10248
select o;
Order firstOrder = query.First();
Console.WriteLine("{0},总金额为:{1}", firstOrder, firstOrder.OrderItems.Sum(i => i.Quantity * i.UnitPrice));
//第五步：更新对象
firstOrder.OrderID = 10249;//假设我们修改一下订单编号
//你还可以对该对象做任何的修改，例如增加一个订单记录
firstOrder.OrderItems.Add(new OrderItem()
{
Product = new Product()
{
ProductId = 3, ProductName = "Mishi Kobe Niku"
},
UnitPrice = 10000,
Quantity = 1
});
db.Store(firstOrder);//更新的语法与刚才插入的时候是一模一样的，内部会判断出来到底是更新还是新增
Console.WriteLine("{0},总金额为:{1}", firstOrder, firstOrder.OrderItems.Sum(i => i.Quantity * i.UnitPrice));
//第六步：删除对象
db.Delete(firstOrder);
//第七步：批处理（上面的操作都是立即生效的，如果操作数不多的话，很简单也很直接，但因为每次都涉及到数据文件的读写，如果我们有一个循环，要批量做一些事情，则可能会有性能方面的问题，所以下面提供了批处理模式）
//首先得将数据库的模式切换到批处理模式
db.AutoSubmitMode = false;
for (int i = 0; i < 10; i++)
{
Order temp = new Order()
{
OrderID = 10248,
OrderDate = DateTime.Now,
Customer = customer,
Employee = employee,
OrderItems = new List <OrderItem>()
{
new OrderItem()
{
Product = product,
UnitPrice = 20.5m,
Quantity = 3
},
new OrderItem()
{
Product = new Product()
{
ProductId = 2,
ProductName = "Grandma's Boysenberry Spread"
},
UnitPrice = 333,
Quantity = 1
}
}
};
db.Store(temp);//语法还是一模一样的
}
//区别在于，如果是批处理模式，则必须明确地调用SubmitChanges才生效
XSubmitStatus status = db.SubmitChanges();
//这个SubmitChanges方法默认情况下，如果遇到某个操作出错，那么后面的操作就不会进行了。
//如果希望出错后继续，那么应该使用下面的语法
//XSubmitStatus status=db.SubmitChanges(true);
//第八步：事务性操作
//要进行事务性操作，必须处于批处理模式中。我最后将它做了简化，调用下面的方法即可
//XSubmitStatus status = db.SubmitChangesWithTransaction();
//第九步：关闭数据库
db.Close();
}
Console.Read();
//后续任务
}
