?????????????????????CodeFirst??????????????????
?????????Entity Framwork??????????ModelFist??DBFirst??CodeFirst???У?CodeFirst?????д???????????
????????CodeFist????????????????λ?????????????????????????
????1. ???CodeFirst????????????
????????????????????????????????????Model:Author??Blog???DbContext?? DbContext??????????￡?
????????????->???->?????->ADO.NET Entity Data Model->Empty Code First model
??????????????￡?
1 //????????????????????+???s?????????TableAttribute?????????????T_Authors
2     [Table("T_Authors")]
3     public class Author
4     {
5         public int Id { set; get; }
6         public string Name { set; get; }
7         /*
8         ?????????Blog??????????????????Blog?????????????????????????Σ???public int Id { set; get; }??
?????????????????????"EntityType 'Blog' has no key defined. Define the key for this EntityType.
9 ????????Blogs: EntityType: EntitySet 'Blogs' is based on type 'Blog' that has no keys defined."
10 ????????*/
11         public virtual ICollection<Blog> Blogs { set; get; }
12     }
13
14     [Table("T_Blogs")]
15     public class Blog
16     {
17         public int Id { set; get; }
18         public string Title { set; get; }
19         public DateTime Time { set; get; }
20         public int AuthorId { set; get; }
21         public virtual Author Author { set; get; }
22     }
23
24     public class MyDbContext: DbContext
25     {
26          public MyDbContext()
27             : base("name=MyDbContext")
28         {
29         }
30         //DbContext??????????????connectionStrings?????????????????????????
31         //DbContext????DbSet??????????????????????????????Author???????????????????T_Authors?????
32         public virtual DbSet<Author> Authors { set; get; }
33     }
????CodeFirst????????????????е??????????????????С????????MYSQL???????????????￡?
1 <!--EF for MYSQL-->
2 ??<entityFramework codeConfigurationType="MySql.Data.Entity.MySqlEFConfiguration?? MySql.Data.Entity.EF6">
3     <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory?? EntityFramework" />
4     <providers>
5       <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices?? MySql.Data.Entity.EF6" />
6     </providers>
7   </entityFramework>
8   <connectionStrings>
9     <add name="MyDbContext" connectionString="server=localhost;port=3306;database=EF;uid=root;password=root" providerName="System.Data.MySqlClient" />
10   </connectionStrings>
????PS:С????????EF6??MYSQL?????????????????????Mysql.Data.Entity.EF6???EntityFrameword 6.0?????á?
??????????????????????????????????????????Main??????д???д???
????1 using (var db = new ManagerDb())
????2 {
????3     db.Authors.Add(new Author() { Name = "xfh" });
????4     db.SaveChanges();
????5 }
???????г??????????EF????????????????????????????EF(??????????????)????????T_Authors??

???????????????DbContext???Blog??????????????????????????T_Blogs???????????Author???ж?????Blog????????????????????
????public virtual ICollection<Blog> Blogs { set; get; } ????????????????????????????T_Blogs?????????T_Authors???????????????????_migrationhistory??????????????????????????????????????е?MigrationId??ε??????????????Migration??????????????????????ε???????????????? Update-Database -TargetMigration:MigrationIdValue ?????????????MigrationIdValue???????Migration??????Git?汾?????е???????????????????????????汾?????????????????_migrationhistory?????????????????Migration?????