Fluent NHibernate 有很多外键映射问题

发布于 2024-11-07 02:32:48 字数 1716 浏览 0 评论 0原文

我正在尝试在 nhibernate

Tables:

Employees
employeeID int
username varchar(30)
departmentID int

Departments
departmentID int
deptName varchar(50)

中映射一个简单的数据结构我的部门映射如下所示:

public class DepartmentMap: ClassMap<Department>
{
    public DepartmentMap()
    {
        Id(m => m.DepartmentID).Column("departmentID");
        Map(m => m.DepartmentName).Column("deptName").Length(50);

        HasMany(m => m.Employees);

        Table("Departments");
    }
}

员工映射

public class EmployeeMap : ClassMap<Employee>
{
    public EmployeeMap()
    {
        Id(x => x.EmployeeID, "employeeID");
        Map(x => x.UserName, "username").Length(30);

        References<Department>(x => x.Department, "departmentID");

        Table("Employees");
    }
}

... 以及我试图循环各部门并提取每个部门的所有员工的 :

foreach (var i in _directoryData.DepartmentCollection)
{
    foreach (var e in i.Employees)
    {
        Debug.WriteLine(i.DepartmentName + " " + e.UserName);
    }
}

这给了我一个错误,指出“无效的列名'Department_id'。”......并且在生成的查询中它也使用department_id。当我循环遍历部门并输出部门名称时,它工作正常。

知道我缺少什么来获取部门 ID 的正确列名称吗?这是我的模型对象,以防万一:

public class Department
{
    public virtual int DepartmentID { get; set; }
    public virtual string DepartmentName { get; set; }

    public virtual ICollection<Employee> Employees { get; set; }
}

public class Employee : PersistentEntity
{
    public virtual int EmployeeID { get; set; }
    public virtual string UserName { get; set; }

    public virtual Department Department { get; set; }
}

I'm trying to map a simple data structure in nhibernate

Tables:

Employees
employeeID int
username varchar(30)
departmentID int

Departments
departmentID int
deptName varchar(50)

My department mapping is like so:

public class DepartmentMap: ClassMap<Department>
{
    public DepartmentMap()
    {
        Id(m => m.DepartmentID).Column("departmentID");
        Map(m => m.DepartmentName).Column("deptName").Length(50);

        HasMany(m => m.Employees);

        Table("Departments");
    }
}

... and the employee mapping

public class EmployeeMap : ClassMap<Employee>
{
    public EmployeeMap()
    {
        Id(x => x.EmployeeID, "employeeID");
        Map(x => x.UserName, "username").Length(30);

        References<Department>(x => x.Department, "departmentID");

        Table("Employees");
    }
}

I'm trying to loop through departments and pull all employees from each department:

foreach (var i in _directoryData.DepartmentCollection)
{
    foreach (var e in i.Employees)
    {
        Debug.WriteLine(i.DepartmentName + " " + e.UserName);
    }
}

which gives me an error stating "Invalid column name 'Department_id'." ... and in the generated query it uses department_id as well. When I just loop through departments and output the department name it works fine.

Any idea what I'm missing to get the correct column name for departmentID? Here are my model objects just in case:

public class Department
{
    public virtual int DepartmentID { get; set; }
    public virtual string DepartmentName { get; set; }

    public virtual ICollection<Employee> Employees { get; set; }
}

public class Employee : PersistentEntity
{
    public virtual int EmployeeID { get; set; }
    public virtual string UserName { get; set; }

    public virtual Department Department { get; set; }
}

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评论(3

伴我老 2024-11-14 02:32:48

您可以: 创建 Fluent NHibernate 约定,以便将 HasMany “外键”创建为 <'Name'>ID

或者更改部门映射:

 HasMany(m => m.Employees).KeyColumns.Add("DepartmentID")

You may either: create a Fluent NHibernate convention so that the HasMany "foreign key" is created as <'Name'>ID.

Or change the Department mapping:

 HasMany(m => m.Employees).KeyColumns.Add("DepartmentID")
听,心雨的声音 2024-11-14 02:32:48

您需要指定键列。

HasMany(m => m.Employees).KeyColumn("DepartmentId");

You need to specify the key column.

HasMany(m => m.Employees).KeyColumn("DepartmentId");
放低过去 2024-11-14 02:32:48

您需要在 HasMany 声明上使用 KeyColumn 方法,如 文档

You need to use the KeyColumn method on the HasMany declaration, as explained in the documentation

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