C# 实体框架-右键连接到视图

我的数据库上下文中有2个实体：

员工
雇员假期权利

我认为这是一种相当正常的一对一关系——但员工可以在没有员工假期权利的情况下生存，但员工假期权利不能在没有员工的情况下生存

员工被映射到我的数据库中的视图 员工假期权利是一个表格

我的课程是：

员工假期权利

[Table("tblEmployeeHolidayEntitlement")]
public class EmployeeHolidayEntitlement
{
    [Key]
    public int EmployeeNumber { get; set; }

    public virtual Employee Employee { get; set; }

    public decimal StandardEntitlement { get; set; }

    //.....omitted for brevity
}

[Table("vEmployee")] //note v - it's a view
public class Employee
{
    [Key]
    public int EmployeeNumber { get; set; }

    public string FirstName { get; set; }
    public string LastName { get; set; }
}

员工

[Table("tblEmployeeHolidayEntitlement")]
public class EmployeeHolidayEntitlement
{
    [Key]
    public int EmployeeNumber { get; set; }

    public virtual Employee Employee { get; set; }

    public decimal StandardEntitlement { get; set; }

    //.....omitted for brevity
}

[Table("vEmployee")] //note v - it's a view
public class Employee
{
    [Key]
    public int EmployeeNumber { get; set; }

    public string FirstName { get; set; }
    public string LastName { get; set; }
}

在构建上下文时，我会：
（不确定这是否正确！）

但这（我认为）是在做一个左连接- 它只返回在TblemployeeHolidayAuthentication中有条目的两个实体

我可以想象，生成的SQL需要如下所示：

SELECT 
employee.EmployeeNumber, 
employeeHol.* 

FROM tblEmployeeHolidayEntitlement employeeHol

RIGHT JOIN vEmployee employee
ON 
employeeHol.EmployeeNumber = employee.EmployeeNumber

from user in db.....
select new{user,user.Entitlement};

---

这可能吗？

它按照您的要求进行内部联接

您根本不需要显式联接

你需要像这样的东西：

SELECT 
employee.EmployeeNumber, 
employeeHol.* 

FROM tblEmployeeHolidayEntitlement employeeHol

RIGHT JOIN vEmployee employee
ON 
employeeHol.EmployeeNumber = employee.EmployeeNumber

from user in db.....
select new{user,user.Entitlement};

---

它按照你的要求进行内部连接

您根本不需要显式联接

你需要像这样的东西：

SELECT 
employee.EmployeeNumber, 
employeeHol.* 

FROM tblEmployeeHolidayEntitlement employeeHol

RIGHT JOIN vEmployee employee
ON 
employeeHol.EmployeeNumber = employee.EmployeeNumber

from user in db.....
select new{user,user.Entitlement};

---

您的代码正在进行内部联接。我相信您要求检索所有员工，以及每个员工的

EmployeeHolidayAuthentication

（如果存在）

要执行左连接，请使用类似以下内容的查询：

from adUser in db.ADUsers
join userEntitlement in db.ADUserHolidayEntitlement on
    adUser.EmployeeNumber equals userEntitlment.EmployeeNumber into g
from userEntitlement in g.DefaultIfEmpty()
select new 
{
    adUser, 
    userEntitlement // Will be null of no entitlement exists
}

---

您的代码正在进行内部联接。我相信您要求检索所有员工，以及每个员工的

EmployeeHolidayAuthentication

（如果存在）

要执行左连接，请使用类似以下内容的查询：

from adUser in db.ADUsers
join userEntitlement in db.ADUserHolidayEntitlement on
    adUser.EmployeeNumber equals userEntitlment.EmployeeNumber into g
from userEntitlement in g.DefaultIfEmpty()
select new 
{
    adUser, 
    userEntitlement // Will be null of no entitlement exists
}