Entity Framework(code first)数据库初始化

1. //1.修改模型，重设数据库
2. using System.Data.Entity;
3. Database.SetInitializer<LisknoveDataContext>(newDropCreateDatabaseIfModelChanges<LisknoveDataContext>());
4. //2.修改模型，重设数据库，并初始化数据
5. using System.Data.Entity;
6. public class LisknoveInitializer:DropCreateDatabaseIfModelChanges<LisknoveDataContext>
7. {
8. protected override void Seed(LisknoveDataContext context)
9. {
10. //base.Seed(context);
11. var genre = new List<Genre>
12. {
13. new Genre{
14. genreName="Marry"
15. },
16. new Genre{
17. genreName="Weair"
18. }
19. };
20. var material = new List<Material>
21. {
22. new Material{
23. materialName="Stone"
24. },
25. new Material{
26. materialName="Water"
27. },
28. new Material{
29. materialName="Flooen"
30. }
31. };
32. var ring = new List<Ring>
33. {
34. new Ring{
35. ringName="MakeRing",
36. price=17.21M,
37. ringImage="ke.jpg",
38. Genre=genre.Single(g=>g.genreName=="Marry"),
39. Material=material.Single(m=>m.materialName=="Water")
40. },
41. new Ring{
42. ringName="ForverRing",
43. price=15.01M,
44. ringImage="for.jpg",
45. Genre=genre.Single(g=>g.genreName=="Marry"),
46. Material=material.Single(m=>m.materialName=="Flooen")
47. }
48. };
49. //genre.ForEach(g => context.Genres.Add(g));
50. ring.ForEach(r => context.Rings.Add(r));//this way enough add data to database without genre
51. and material to add to database.
52. }
53. }
54. Database.SetInitializer<LisknoveDataContext>(new LisknoveInitializer());

55. //1.修改模型，重设数据库
    using System.Data.Entity;
    
    Database.SetInitializer<LisknoveDataContext>(newDropCreateDatabaseIfModelChanges<LisknoveDataContext>());
    
    //2.修改模型，重设数据库，并初始化数据
        using System.Data.Entity;
    
        public class LisknoveInitializer:DropCreateDatabaseIfModelChanges<LisknoveDataContext>
        {
            protected override void Seed(LisknoveDataContext context)
            {
                //base.Seed(context);
                var genre = new List<Genre>
                {
                    new Genre{
                        genreName="Marry"
                    },
                    new Genre{
                        genreName="Weair"
                    }
                };
    
                var material = new List<Material>
                {
                    new Material{
                        materialName="Stone"
                    },
                    new Material{
                        materialName="Water"
                    },
                    new Material{
                        materialName="Flooen"
                    }
                };
    
                var ring = new List<Ring>
                {
                    new Ring{
                        ringName="MakeRing",
                        price=17.21M,
                        ringImage="ke.jpg",
                        Genre=genre.Single(g=>g.genreName=="Marry"),
                        Material=material.Single(m=>m.materialName=="Water")
                    },
                    new Ring{
                        ringName="ForverRing",
                        price=15.01M,
                        ringImage="for.jpg",
                        Genre=genre.Single(g=>g.genreName=="Marry"),
                        Material=material.Single(m=>m.materialName=="Flooen")
                    }
                };
    
                //genre.ForEach(g => context.Genres.Add(g));
                ring.ForEach(r => context.Rings.Add(r));//this way enough add data to database without genre
                                                                                 and material to add to database.
            }
        }
    
    Database.SetInitializer<LisknoveDataContext>(new LisknoveInitializer());

示例

1. using System.Collections.Generic;
2. public class UserInfo
3. {
4. public int UserInfoID { get; set; }
5. public string userName { get; set; }
6. public int age { get; set; }
7. public virtual ICollection<Lesson> lessones { get; set; }
8. }

using System.Collections.Generic;
public class UserInfo
{
    public int UserInfoID { get; set; }
    public string userName { get; set; }
    public int age { get; set; }
    public virtual ICollection<Lesson> lessones { get; set; }
}

1. using System.Collections;
2. using System.Collections.Generic;
3. public class Lesson {
4. public int lessonID { get; set; }
5. public string lessonName { get; set; }
6. public string teacherName { get; set; }
7. public virtual UserInfo UserInfo{get;set;}
8. }

using System.Collections;
using System.Collections.Generic;
public class Lesson {
    public int lessonID { get; set; }
    public string lessonName { get; set; }
    public string teacherName { get; set; }
    public virtual UserInfo UserInfo{get;set;}
}

1. using System.Data.Entity;
2. public class TestUsersDB : DbContext
3. {
4. public DbSet<UserInfo> UserInfoes { get; set; }
5. public DbSet<Lesson> Lessons{get;set;}
6. }

using System.Data.Entity;
public class TestUsersDB : DbContext
{
    public DbSet<UserInfo> UserInfoes { get; set; }
    public DbSet<Lesson> Lessons{get;set;}
}

1. using System;
2. using System.Collections.Generic;
3. using System.Linq;
4. using System.Web;
5. using System.Web.Mvc;
6. using System.Data.Entity;
7. namespace MvcApplication1.Controllers
8. {
9. public class HomeController : Controller
10. {
11. public string Index()
12. {
13. ViewBag.Message = "欢迎使用 ASP.NET MVC!";
14. Database.SetInitializer<TestUsersDB>(new DropCreateDatabaseIfModelChanges<TestUsersDB>());
15. var getName = 0;
16. using(TestUsersDB context = new TestUsersDB()){
17. var users = new UserInfo() { userName="xcl",age=23};
18. context.UserInfoes.Add(users);
19. context.SaveChanges();
20. getName = (from c in context.UserInfoes where c.age > 0 select c.age).First();
21. }
22. return getName.ToString();
23. //return View(getName);
24. }
25. public ActionResult About()
26. {
27. return View();
28. }
29. }
30. }