在EF中直接运行SQL命令

一、在 EF第一个版本（.NET 3.5 SP1）中

通过将ObjectContext.Connection转换为EntityConnection，

再把 EntityConnection.StoreConnection转换为SqlConnection。

有了这个SqlConnection，我们再创建 SqlCommand便能顺利运行SQL命令了。

例如：

EntityConnection entityConnection = (EntityConnection)ctx.Connection;
DbConnection storeConnection = entityConnection.StoreConnection;
DbCommand cmd = storeConnection.CreateCommand();
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.CommandText = "[PRO_USER_DIGITALCARD_CHECK]";

....

二、在EF4（.NET 4）中

ObjectContext.ExecuteStoreCommand(...) 执行某一并无返回集的SQL 命令，例如ADD，UPDATE，DELETE操作

ObjectContext.ExecuteStoreQuery<T>(...) 执行某一个查询，并可以将返回集转换为某一对象

using (var ctx = new MyObjectContext())
{
int result = ctx.ExecuteStoreCommand("UPDATE Person SET Name = 'Michael' WHERE PersonID = 1");
}

using (var ctx = new MyObjectContext())
{
IEnumerable<PersonView> peopleViews = ctx.ExecuteStoreQuery<PersonView>("SELECT PersonID, Name FROM Person");
}

public class PersonView
{
public int PersonID { get; set; }
public string Name { get; set; }
}

三、在EF4.1中

DbContext将ObjectContext做了包装，

DbContext.Database就是对应于数据库端信息的封装

执行SQL命令也从Database类型开始

using (var ctx = new MyDbContext())
{
int result = ctx.Database.ExecuteSqlCommand("UPDATE Person SET Name = 'Michael' WHERE PersonID = 1");
}

using (var ctx = new MyDbContext())
{
IEnumerable<PersonView> peopleViews = ctx.SqlQuery<PersonView>("SELECT PersonID, Name FROM Person").ToList();
}

public class PersonView
{
public int PersonID { get; set; }
public string Name { get; set; }
}

示例:

1.无参数查询：

List<UserInfo> list = db.Database.SqlQuery<UserInfo>("select* from UserInfo ").ToList();

2、有参查询

List<UserInfo> list = db.Database.SqlQuery<UserInfo>("select* from UserInfoes where id=@ID ",new SqlParameter("@ID",id)).ToList();

3.EF 执行存储过程或delete 删除语句
SqlParameter[] paras = new SqlParameter[] {
　　new SqlParameter("@ID",id)
};
int result = db.Database.ExecuteSqlCommand("delete UserInfoes  where id=@ID", paras);
int result = db.Database.ExecuteSqlCommand("sp_Userinfos_deleteByID @ID", paras);

参考文章：

http://www.cnblogs.com/chengxiaohui/articles/2092001.html

http://www.360doc.com/content/14/0709/00/5054188_393081769.shtml