PostgreSQL Entity Framework 自动迁移

1、依次添加NuGet包 EntityFramework、Npgsql、EntityFramework6.Npgsql，会自动生成一些配置文件，不过缺少数据库驱动的配置节点：

 1   <system.data>
 2     <DbProviderFactories>
 3       <!--  注意这里，安装程序包时，这里的配置并不会自动添加  -->
 4       <remove invariant="Npgsql" />
 5       <add name="Npgsql" invariant="Npgsql" description=".Net Framework Data Provider for Postgresql" type="Npgsql.NpgsqlFactory, Npgsql" />
 6     </DbProviderFactories>
 7   </system.data>
 8   <connectionStrings>
 9     <!-- 数据库连接字符串, 主机, 用户, 密码, 数据库 -->
10     <add name="mes" connectionString="Server=localhost;Uid=postgres;Password=1234;Database=Mes" providerName="Npgsql"/>
11   </connectionStrings>

2、添加测试的数据库模型：

 1     public class BaseModel
 2     {
 3         [Key]
 4         [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
 5         public long Id { get; set; }
 6         public string Remark { get; set; }
 7         public DateTime CreTime { get; set; } = DateTime.Now;
 8         public bool IsDel { get; set; } = false;
 9         public DateTime? UpdateTime { get; set; }
10     }
11 
12     [Table("User")]
13     public class User : BaseModel
14     {
15         public string Account { get; set; }
16         public string Label { get; set; }
17         public string Passwd { get; set; }
18         public long? UpdateUid { get; set; }
19     }
20 
21     [Table("Order")]
22     public class Order: BaseModel
23     {
24         public string OrderNo { get; set; }
25         public decimal Qty { get; set; }
26         public string Style { get; set; }
27         public string Size { get; set; }
28         public string Color { get; set; }
29         public DateTime? DeliveryTime { get; set; }
30         public string ShipAddress { get; set; }
31         public string Phone { get; set; }
32         public long? CustomerId { get; set; }
33 
34         [ForeignKey("CustomerId")]
35         public User Customer { get; set; }
36     }

3、数据库上下文：

 1     public class MesContext:DbContext
 2     {
 3         public MesContext():base("name=mes")
 4         {
 5 
 6         }
 7         
 8 
 9         public DbSet<User> Users { get; set; }
10         public DbSet<Order> Orders { get; set; }
11     }

4、添加自动迁移配置：

1     public class MigrationConfig:DbMigrationsConfiguration<MesContext>
2     {
3         public MigrationConfig()
4         {
5             AutomaticMigrationsEnabled = true;
6             //到生产环境后，注释以下
7             AutomaticMigrationDataLossAllowed = true;
8         }
9     }

5、发布代码时，自动迁移到最新：

1             using (var db = new MesContext())
2             {
3                 new MigrateDatabaseToLatestVersion<MesContext, MigrationConfig>("mes").InitializeDatabase(db);
4 
5                 //测试添加User
6                 db.Users.Add(new User() {Account = "009", Label = "shanghai", Passwd = "123456"});
7                 db.SaveChanges();
8             }

6、完整配置文件：App.config

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <configuration>
 3   <configSections>
 4     <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
 5     <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
 6   </configSections>
 7   <startup>
 8     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
 9   </startup>
10   <entityFramework>
11     <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
12     <providers>
13       <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
14       <provider invariantName="Npgsql" type="Npgsql.NpgsqlServices, EntityFramework6.Npgsql" />
15     </providers>
16   </entityFramework>
17   <runtime>
18     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
19       <dependentAssembly>
20         <assemblyIdentity name="Npgsql" publicKeyToken="5d8b90d52f46fda7" culture="neutral" />
21         <bindingRedirect oldVersion="0.0.0.0-3.2.5.0" newVersion="3.2.5.0" />
22       </dependentAssembly>
23     </assemblyBinding>
24   </runtime>
25   <system.data>
26     <DbProviderFactories>
27       <!--  注意这里，安装程序包时，这里的配置并不会自动添加  -->
28       <remove invariant="Npgsql" />
29       <add name="Npgsql" invariant="Npgsql" description=".Net Framework Data Provider for Postgresql" type="Npgsql.NpgsqlFactory, Npgsql" />
30     </DbProviderFactories>
31   </system.data>
32   <connectionStrings>
33     <!-- 数据库连接字符串, 主机, 用户, 密码, 数据库 -->
34     <add name="mes" connectionString="Server=localhost;Uid=postgres;Password=1234;Database=Mes" providerName="Npgsql"/>
35   </connectionStrings>
36 </configuration>

7、NuGet配置：packages.config

1 <?xml version="1.0" encoding="utf-8"?>
2 <packages>
3   <package id="EntityFramework" version="6.2.0" targetFramework="net45" />
4   <package id="EntityFramework6.Npgsql" version="3.1.1" targetFramework="net45" />
5   <package id="Npgsql" version="3.2.5" targetFramework="net45" />
6   <package id="System.Threading.Tasks.Extensions" version="4.3.0" targetFramework="net45" />
7 </packages>

 注：第一次自动迁移前需要手动先创建数据库（Mes）

posted on 2017-11-14 21:47  jonney_wang  阅读(630)  评论(0)  编辑  收藏  举报

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