我有一个要求，我需要为特定职位选择家长部门。我把表格作为
public partial class Position
{
public int PositionId { get; set; }
public string PositionName { get; set; }
public int ParentPositionId { get; set; }
}
public partial class DeptPosition
{
public long Id { get; set; }
public int DeptId { get; set; }
public int PosId { get; set; }
}
public partial class Dept
{
public int DepartmentId { get; set; }
public string DepartmentName { get; set; }
}
现在，职位可以将父母作为另一个职位或部门。假设Pos1的父母为Pos2，Pos2的父母为Pos3，而Pos3的父母为Dept1。所以这里我如何通过其他位置获得Pos1的父亲Dept1。现在，如果Dept1是Pos1的直接父级，那么我可以找到并修复它，但是如果一个位置间接地在父级中有父级，那么如何编写查询。
Example:1
Department
DepartmentId DepartmentName
----------------------------------------------
1 HR
2 IT
Position
--------------------------------------------------------
PositionId PositionName ParentPositionId
1001 Pos1 1002 //Pos2
1002 Pos2 1003 //Pos3
1003 Pos3 null
1004 Pos4 null
DeptPos
Id DeptId PosId
----------------------------------------
2001 1 1003
2002 2 1004
感谢所有回复。 现在说如果我想获得Pos3的父母部门。然后我会简单地说
var parId=db.DeptPos.FirstOfDefault(x=>x.PositionId==id).DeptId;
var parName=db.Department.FirstOfDefault(x=>x.DepartmentId==parId).DepartmentName;
Here id for the position is 1003
现在，这将为父母部门提供该职位 因为Pos1没有部门作为直接父母，所以现在我说
Example:2
Here the id for the position is 1001
var parId=db.DeptPos.FirstOfDefault(x=>x.PositionId==id).DeptId;
Here I get parId as null since Pos1 with Id 1001 doesnot a department as direct parent.
if(parId==null)
{
var parPosId=db.Positions.FirstOrDefault(x=>x.PositionId==id).ParentPositionId
//Getting ParentPositionRecord
var parPosId2=db.Positions.FirstOrDefault(x=>x.PositionId==parPosId).ParentPositionId;
//Now if there are 20 positions and let's say if that position is having a parent Department via 10 positions. An example here
}
Position
--------------------------------------------------------
PositionId PositionName ParentPositionId
1001 Pos1 1002
1002 Pos2 1003
1003 Pos3 1004
1004 Pos4 1005
1005 Pos5 1006
1006 Pos6 1007
1007 Pos7 1008
1008 Pos8 1009
1009 Pos9 1010
1010 Pos10 null
---- ---- ------
1020 Pos20 null
DeptPos
Id DeptId PosId
----------------------------------------
2001 1 1010
2002 2 1020
I need to go on repeating code 10 times or might be ...........
So is there something which gives me DeptId as 1 from DeptPos in above example by some other way.
希望这有帮助。