|
撤销提交
|
var customer = ctx.Customers.Single(c => c.CustomerID == "AROUT");
customer.ContactName = "zhuye";
customer.Country = "Shanghai";
Response.Write(string.Format("Name:{0},Country:{1}<br/>", customer.ContactName, customer.Country));
customer = ctx.Customers.GetOriginalEntityState(customer);
Response.Write(string.Format("Name:{0},Country:{1}<br/>", customer.ContactName, customer.Country));
|
上面的代码执行效果如下：
|
Name:zhuye,Country:Shanghai
Name:Thomas Hardy,Country:UK
|
批量操作
下面的代码会导致提交N次DELETE操作：
|
var query = from c in ctx.Customers select c;
ctx.Customers.RemoveAll(query);
ctx.SubmitChanges();
|
应该使用sql语句进行批操作：
|
string sql = String.Format("delete from {0}", ctx.Mapping.GetTable(typeof(Customer)).TableName);
ctx.ExecuteCommand(sql);
|
对于批量更新操作也是同样道理。
|
一步一步学Linq to sql（九）：其它补充(三)
2010年05月17日 星期一 17:04
撤销提交
|
var customer = ctx.Customers.Single(c => c.CustomerID == "AROUT");
customer.ContactName = "zhuye";
customer.Country = "Shanghai";
Response.Write(string.Format("Name:{0},Country:{1}<br/>", customer.ContactName, customer.Country));
customer = ctx.Customers.GetOriginalEntityState(customer);
Response.Write(string.Format("Name:{0},Country:{1}<br/>", customer.ContactName, customer.Country));
|
上面的代码执行效果如下：
|
Name:zhuye,Country:Shanghai
Name:Thomas Hardy,Country:UK
|
批量操作
下面的代码会导致提交N次DELETE操作：
|
var query = from c in ctx.Customers select c;
ctx.Customers.RemoveAll(query);
ctx.SubmitChanges();
|
应该使用sql语句进行批操作：
|
string sql = String.Format("delete from {0}", ctx.Mapping.GetTable(typeof(Customer)).TableName);
ctx.ExecuteCommand(sql);
|
对于批量更新操作也是同样道理。
|
相关文章：