流利NHibernate连接表中的映射不使用主键

问题描述

我试图从2个表格中创建一个不是通过主键关联的实体

表格：

  CREATE TABLE [employees]（
 [ssn] [nvarchar]（9）NULL，
 [active] [bit] NULL，
 [employee_id] [int] IDENTITY（1,1）NOT NULL 
）
 
 
 CREATE TABLE [sam_employees]（
 [ssn] [nvarchar]（9）NULL，
 [first_name] [nvarchar]（50）NULL，
 [last_name] [nvarchar]（50）NULL，
 [skill] [nvarchar]（50 ）NULL，
 .... 
）
  

生成：

  SELECT this_.employee_id as employee1_0_0_，
 this_.ssn as ssn0_0_，
 this_.active as active0_0_，
 this_1_.first_name as first2_1_0_，
 this_1_.last_name as last3_1_0_，
 this_1_.skill as skill1_0_ 
 FROM employees this_ 
 inner join sam_employees this_1_ 
 on this_。 ssn = this_1_.ssn 
 WHERE this_.active = 1 
  

我当前的映射：

  public class EmployeeMap：ClassMap< Employee> 
 {
 public EmployeeMap（）
 {
表（employees）; 
 Id（x => x.Id，employee_id）; 
 Map（x => x.SSN，ssn）; 
 Map（x => x.IsActive，active）; 
 
加入（sam_employees，mm => 
 {
 mm.KeyColumn（ssn）; 
 mm.Map（xx => xx。 FirstName，first_name）; 
 mm.Map（xx => xx.LastName，last_name）; 
 mm.Map（xx => xx.Skill，skill）; 
}）; 
 
 
 
 
 
 
 $ b 
但是在这个映射中，我有这样的连接条件.employee_id = this_1_.ssn 
 
 
 
我知道这个问题以前曾经问过，但是我没有找到一个好的答案，只是解决方法是在数据库端使用View您可以尝试将sam_employees作为实体映射，并使用带有连接类型获取的引用映射。
  > 
I'm trying to create one entity from 2 tables that are related not by primary key

Tables:
CREATE TABLE [employees](
    [ssn] [nvarchar](9) NULL,
    [active] [bit] NULL,    
    [employee_id] [int] IDENTITY(1,1) NOT NULL 
)


CREATE TABLE [sam_employees](
    [ssn] [nvarchar](9) NULL,
    [first_name] [nvarchar](50) NULL,
    [last_name] [nvarchar](50) NULL,
    [skill] [nvarchar](50) NULL,
    ....
)
SQL to generate:
SELECT this_.employee_id  as employee1_0_0_,
       this_.ssn          as ssn0_0_,
       this_.active       as active0_0_,
       this_1_.first_name as first2_1_0_,
       this_1_.last_name  as last3_1_0_,
       this_1_.skill      as skill1_0_
FROM   employees this_
       inner join sam_employees this_1_
         on this_.ssn = this_1_.ssn
WHERE  this_.active = 1
My current mapping:
public class EmployeeMap : ClassMap<Employee>
{
    public EmployeeMap()
    {
        Table("employees");
        Id(x => x.Id, "employee_id");
        Map(x => x.SSN, "ssn");
        Map(x => x.IsActive, "active");

        Join("sam_employees", mm =>
                                  {                                          
                                      mm.KeyColumn("ssn");
                                      mm.Map(xx => xx.FirstName, "first_name");
                                      mm.Map(xx => xx.LastName, "last_name");
                                      mm.Map(xx => xx.Skill, "skill");
                                  });            
    }
}
But with this mapping I have such join condition on this_.employee_id = this_1_.ssn
I know that this question was asked before but I didn't find a good answer for it, just workaround to use View in database side instead of tables.
 解决方案 
You can try mapping sam_employees as an entity and use a References mapping with a join type fetch.
                        
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