Entity Framework(code first)数据库初始化

Posted 2020-07-21 Avatarx

1. //1.修改模型，重设数据库  
2. using System.Data.Entity;  
3.   
4. Database.SetInitializer<LisknoveDataContext>(newDropCreateDatabaseIfModelChanges<LisknoveDataContext>());  
5.   
6. //2.修改模型，重设数据库，并初始化数据  
7.     using System.Data.Entity;  
8.   
9.     public class LisknoveInitializer:DropCreateDatabaseIfModelChanges<LisknoveDataContext>  
10.     {  
11.         protected override void Seed(LisknoveDataContext context)  
12.         {  
13.             //base.Seed(context);  
14.             var genre = new List<Genre>  
15.             {  
16.                 new Genre{  
17.                     genreName="Marry"  
18.                 },  
19.                 new Genre{  
20.                     genreName="Weair"  
21.                 }  
22.             };  
23.   
24.             var material = new List<Material>  
25.             {  
26.                 new Material{  
27.                     materialName="Stone"  
28.                 },  
29.                 new Material{  
30.                     materialName="Water"  
31.                 },  
32.                 new Material{  
33.                     materialName="Flooen"  
34.                 }  
35.             };  
36.   
37.             var ring = new List<Ring>  
38.             {  
39.                 new Ring{  
40.                     ringName="MakeRing",  
41.                     price=17.21M,  
42.                     ringImage="ke.jpg",  
43.                     Genre=genre.Single(g=>g.genreName=="Marry"),  
44.                     Material=material.Single(m=>m.materialName=="Water")  
45.                 },  
46.                 new Ring{  
47.                     ringName="ForverRing",  
48.                     price=15.01M,  
49.                     ringImage="for.jpg",  
50.                     Genre=genre.Single(g=>g.genreName=="Marry"),  
51.                     Material=material.Single(m=>m.materialName=="Flooen")  
52.                 }  
53.             };  
54.   
55.             //genre.ForEach(g => context.Genres.Add(g));  
56.             ring.ForEach(r => context.Rings.Add(r));//this way enough add data to database without genre   
57.                                                                              and material to add to database.  
58.         }  
59.     }  
60.   
61. Database.SetInitializer<LisknoveDataContext>(new LisknoveInitializer());  

62. //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

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print?

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; }
}

 

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print?

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;}
}

 

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print?

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;}
}

 

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print?

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.   
8. namespace MvcApplication1.Controllers  
9. {  
10.     public class HomeController : Controller  
11.     {  
12.         public string Index()  
13.         {  
14.             ViewBag.Message = "欢迎使用 ASP.NET MVC!";  
15.   
16.             Database.SetInitializer<TestUsersDB>(new DropCreateDatabaseIfModelChanges<TestUsersDB>());  
17.             var getName = 0;  
18.             using(TestUsersDB context = new TestUsersDB()){  
19.             var users = new UserInfo() { userName="xcl",age=23};  
20.               
21.             context.UserInfoes.Add(users);  
22.             context.SaveChanges();  
23.   
24.             getName = (from c in context.UserInfoes where c.age > 0 select c.age).First();  
25.             }  
26.             return getName.ToString();  
27.             //return View(getName);  
28.         }  
29.   
30.         public ActionResult About()  
31.         {  
32.             return View();  
33.         }  
34.     }  
35. }