EF框架用法
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编程小技巧:输入for,foreach,cw...然后按两次tab键能快速产生代码
EntityCollection的using指令是:using System.Data.Objects.DataClasses;
ObjectQuery的using指令是:using System.Data.Objects;
主表来映射时应该映射到外键表。
ObjectContext---DataAdapter
ObjectQuery-----Dataset
IQueryable list = context.DBItemList.OrderBy(p=>p.ItemValue);
//IQueryable可以用来进行数据筛选或其他运算
static void Main(string[] args)
{
WanceMISEntities MISData = new WanceMISEntities();
//ObjectQuery department_list = MISData.Department;//从主键表访问数据
//foreach(Department department_Entity in department_list)
//{
// Console.WriteLine("{0},{1}",department_Entity.DepartmentID,department_Entity.DepartmentName);
// EntityCollection departmentuser_list = department_Entity.DepartmentUser_1;
// departmentuser_list.Load();//加载外键数据
// foreach (DepartmentUser departmentuser_Entity in departmentuser_list)
// {
// Console.WriteLine("{0},{1}",departmentuser_Entity.DepartmentUserID,departmentuser_Entity.DepartmentUserState); // } //}
//ObjectQuery departmentuser_list = MISData.DepartmentUser;//从外键表访问数据
//foreach (DepartmentUser departmentuser_Entity in departmentuser_list)
//{
// Console.WriteLine("{0},{1}",departmentuser_Entity.DepartmentUserID,departmentuser_Entity.DepartmentUserState);
// departmentuser_Entity.Department_1Reference.Load();
// Department department = departmentuser_Entity.Department_1;
// Console.WriteLine("{0},{1}",department.DepartmentID,department.DepartmentName);
//}
//var v = MISData.Department.First(s=>s.DepartmentID=="1");//删除主键
//要删除主键时,要保证内存中对应的外键数据为空
//v.DepartmentUser_1.Load();
//if (v.DepartmentUser_1.Count != 0)
//{
// List departmentuser = new List();
// foreach (var w in v.DepartmentUser_1)
// {
// departmentuser.Add(w);
// }
// foreach (var item in departmentuser)
// {
// MISData.DeleteObject(item);
// }
//}
//MISData.DeleteObject(v);
//MISData.SaveChanges();
//DepartmentUser departmentuser = new DepartmentUser();//直接插入外键数据
//departmentuser.AccountID = "1";
//departmentuser.DepartmentUserID = "1";
//departmentuser.DepartmentUserState =1;
//departmentuser.Department_1 = MISData.Department.First(s=>s.DepartmentID=="1");//要有主键信息
//MISData.AddToDepartmentUser(departmentuser);
//MISData.SaveChanges();
//通过主键插入外键数据
//var tab1 = MISData.Department.First(s=>s.DepartmentID=="1");
//DepartmentUser tab2 = new DepartmentUser();
//tab2.AccountID = "1";
//tab2.DepartmentUserID = "1";
//tab2.DepartmentUserState = 1;
//tab1.DepartmentUser_1.Add(tab2);
//MISData.SaveChanges(); }
EntityCollection的using指令是:using System.Data.Objects.DataClasses;
ObjectQuery的using指令是:using System.Data.Objects;
主表来映射时应该映射到外键表。
ObjectContext---DataAdapter
ObjectQuery-----Dataset
IQueryable
//IQueryable
static void Main(string[] args)
{
WanceMISEntities MISData = new WanceMISEntities();
//ObjectQuery
//foreach(Department department_Entity in department_list)
//{
// Console.WriteLine("{0},{1}",department_Entity.DepartmentID,department_Entity.DepartmentName);
// EntityCollection
// departmentuser_list.Load();//加载外键数据
// foreach (DepartmentUser departmentuser_Entity in departmentuser_list)
// {
// Console.WriteLine("{0},{1}",departmentuser_Entity.DepartmentUserID,departmentuser_Entity.DepartmentUserState); // } //}
//ObjectQuery
//foreach (DepartmentUser departmentuser_Entity in departmentuser_list)
//{
// Console.WriteLine("{0},{1}",departmentuser_Entity.DepartmentUserID,departmentuser_Entity.DepartmentUserState);
// departmentuser_Entity.Department_1Reference.Load();
// Department department = departmentuser_Entity.Department_1;
// Console.WriteLine("{0},{1}",department.DepartmentID,department.DepartmentName);
//}
//var v = MISData.Department.First(s=>s.DepartmentID=="1");//删除主键
//要删除主键时,要保证内存中对应的外键数据为空
//v.DepartmentUser_1.Load();
//if (v.DepartmentUser_1.Count != 0)
//{
// List
// foreach (var w in v.DepartmentUser_1)
// {
// departmentuser.Add(w);
// }
// foreach (var item in departmentuser)
// {
// MISData.DeleteObject(item);
// }
//}
//MISData.DeleteObject(v);
//MISData.SaveChanges();
//DepartmentUser departmentuser = new DepartmentUser();//直接插入外键数据
//departmentuser.AccountID = "1";
//departmentuser.DepartmentUserID = "1";
//departmentuser.DepartmentUserState =1;
//departmentuser.Department_1 = MISData.Department.First(s=>s.DepartmentID=="1");//要有主键信息
//MISData.AddToDepartmentUser(departmentuser);
//MISData.SaveChanges();
//通过主键插入外键数据
//var tab1 = MISData.Department.First(s=>s.DepartmentID=="1");
//DepartmentUser tab2 = new DepartmentUser();
//tab2.AccountID = "1";
//tab2.DepartmentUserID = "1";
//tab2.DepartmentUserState = 1;
//tab1.DepartmentUser_1.Add(tab2);
//MISData.SaveChanges(); }
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