将使用实体框架模型数据 [英] Insert data using Entity Framework model
本文介绍了将使用实体框架模型数据的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想插入使用实体框架模型我的数据库中的一些数据,但对于一些未知的原因对我来说,它什么都不做。
我缺少的东西在这里?
使用(VAR上下文=新DatabaseEntities())
{
变种T =新的考验
{
ID = Guid.NewGuid(),
NAME =嗒嗒,
};
context.AddTotest(T);
context.SaveChanges();
}
解决方案
它应该是
context.TableName.AddObject(TableEntityInstance);
其中:
-
表名
:在数据库中的表的名称 -
TableEntityInstance
:表实体类的一个实例
如果你的表是订单
的话:
订购订购=新订单();
context.Orders.AddObject(订单);
例如:
VAR ID = Guid.NewGuid();
//插入
使用(VAR DB =新EfContext(NAME = EfSample))
{
VAR的客户= db.Set<客户>() ;
customers.Add(新客户{客户ID = ID,名字=李四});
db.SaveChanges();
}
下面是一个活生生的例子:
<为pre>
公共无效UpdatePlayerScreen(字节[] imageBytes,串installationKey)
{
VAR球员=(由对在this.ObjectContext.Players其中p。 installationKey == installationKey选择p).FirstOrDefault();
无功电流=(从this.ObjectContext.Screenshots d其中d.PlayerID == player.ID选择D).FirstOrDefault();
如果(电流!= NULL)
{
current.Screen = imageBytes;
current.Refreshed = DateTime.Now;
this.ObjectContext.SaveChanges();
}
,否则
{
截图截图=新截图();
screenshot.ID = Guid.NewGuid();
screenshot.Interval = 1000;
screenshot.IsTurnedOn = TRUE;
screenshot.PlayerID = player.ID;
screenshot.Refreshed = DateTime.Now;
screenshot.Screen = imageBytes;
this.ObjectContext.Screenshots.AddObject(截图);
this.ObjectContext.SaveChanges();
}
}
I'm trying to insert some data in my database using Entity Framework model, but for some unknown reasons to me, it does nothing.
Am I missing something here?
using (var context = new DatabaseEntities())
{
var t = new test
{
ID = Guid.NewGuid(),
name = "blah",
};
context.AddTotest(t);
context.SaveChanges();
}
解决方案
It should be:
context.TableName.AddObject(TableEntityInstance);
Where:
TableName
: the name of the table in the database.TableEntityInstance
: an instance of the table entity class.
If your table is Orders
, then:
Order order = new Order();
context.Orders.AddObject(order);
For example:
var id = Guid.NewGuid();
// insert
using (var db = new EfContext("name=EfSample"))
{
var customers = db.Set<Customer>();
customers.Add( new Customer { CustomerId = id, Name = "John Doe" } );
db.SaveChanges();
}
Here is a live example:
public void UpdatePlayerScreen(byte[] imageBytes, string installationKey)
{
var player = (from p in this.ObjectContext.Players where p.InstallationKey == installationKey select p).FirstOrDefault();
var current = (from d in this.ObjectContext.Screenshots where d.PlayerID == player.ID select d).FirstOrDefault();
if (current != null)
{
current.Screen = imageBytes;
current.Refreshed = DateTime.Now;
this.ObjectContext.SaveChanges();
}
else
{
Screenshot screenshot = new Screenshot();
screenshot.ID = Guid.NewGuid();
screenshot.Interval = 1000;
screenshot.IsTurnedOn = true;
screenshot.PlayerID = player.ID;
screenshot.Refreshed = DateTime.Now;
screenshot.Screen = imageBytes;
this.ObjectContext.Screenshots.AddObject(screenshot);
this.ObjectContext.SaveChanges();
}
}
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