linq关系映射(1)
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C#的这种entity 很像Annotation java的写法..
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.Linq; using System.Data.Linq.Mapping; namespace LinqObject.models { [Table(Name = "Player")] public class PlayerInfoVO { private string name; [Column(Name="name")] public string Name { get { return name; } set { name = value; } } private int id; [Column(IsPrimaryKey=true,Name="id")] public int Id { get { return id; } set { id = value; } } private int level; [Column(Name = "level_id")] public int Level { get { return level; } set { level = value; } } private EntityRef_myLevel; [Association(Storage="_myLevel",ThisKey="level_id")] public EntityRef _MyLevel { get { return _myLevel; } set { _myLevel = value; } } } }
主表:
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.Linq; using System.Data.Linq.Mapping; namespace LinqObject.models{ [Table(Name="myLevel")] public class MyLevel{ private int id; [Column(IsPrimaryKey=true,Name="id")] public int Id { get { return id; } set { id = value; } } private string name; [Column(Name="name")] public string Name { get { return name; } set { name = value; } } private EntitySetplayer; [Association(Storage = "player", OtherKey = "Id")] public EntitySet Player { get { return player; } set { player = value; } } } }
删除 操作 :
using System; using System.Collections.Generic; using System.Linq; using System.Text; using LinqObject.models; namespace LinqObject.mylinq{ public class ConflictLinq{ public void updatePlayer(int id, string name) { AINYLinq db = new AINYLinq(@"Data Source=AONAUFLY\SQLEXPRESS;Initial Catalog=MyLINQ;User ID=sa;Password=******"); IQueryablemyList = from o in db.myLevel where o.Id == 0 && o.Name == "Aonaufly" select o; foreach (var o in myList) { Console.WriteLine("Ainy------------------------"); db.myLevel.DeleteOnSubmit(o); } Console.WriteLine("detail section finished."); Console.ReadLine(); if (myList.Any()) { Console.WriteLine("The parent is presesnt in the Orders collection."); try { var ordF = (from o in db.myLevel where o.Id == 0 select o).First(); db.myLevel.DeleteOnSubmit(ordF); Console.WriteLine(ordF.Name); } catch (Exception e) { Console.WriteLine(e.Message); Console.ReadLine(); } } else { Console.WriteLine("There was no parent in the myLevel"); } try { db.SubmitChanges(); } catch (Exception e) { Console.WriteLine(e.Message); Console.ReadLine(); } } } }
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