Mysql 数据库的.Net Core 2.0 数据库优先方法脚手架-DbContext

Question

我正在使用 MySQL 数据库在 .Net Core 2.0 中开发 WEB API。我正在尝试搭建 MySQL 数据库。我已遵循 This link (MySQL Official Site)，但是当我启动脚手架命令时，我在下面提到了两个错误，如果我做错了什么，请告诉我。脚手架命令（在程序包管理器控制台中触发）

Scaffold-DbContext "server=localhost;port=3306;user=root;password=darshan7826;database=sakila" MySql.Data.EntityFrameworkCore -OutputDir sakila -f

执行上述命令时出错

System.NotImplementedException: The method or operation is not implemented.
at MySql.Data.EntityFrameworkCore.Scaffolding.Internal.MySQLDatabaseModelFactory.Create(String connectionString, IEnumerable`1 tables, IEnumerable`1 schemas)
at Microsoft.EntityFrameworkCore.Scaffolding.Internal.RelationalScaffoldingModelFactory.Create(String connectionString, IEnumerable`1 tables, IEnumerable`1 schemas, Boolean useDatabaseNames)
at Microsoft.EntityFrameworkCore.Scaffolding.Internal.ModelScaffolder.Generate(String connectionString, IEnumerable`1 tables, IEnumerable`1 schemas, String projectPath, String outputPath, String rootNamespace, String contextName, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames)
at Microsoft.EntityFrameworkCore.Design.Internal.DatabaseOperations.ScaffoldContext(String provider, String connectionString, String outputDir, String dbContextClassName, IEnumerable`1 schemas, IEnumerable`1 tables, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContextImpl(String provider, String connectionString, String outputDir, String dbContextClassName, IEnumerable`1 schemaFilters, IEnumerable`1 tableFilters, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContext.<>c__DisplayClass0_1.<.ctor>b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_0`1.<Execute>b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
The method or operation is not implemented.

Answer 1

查看 MySQL Connector for .Net 的官方源代码，您会发现它尚未完成，原因如下：

public DatabaseModel Create(string connectionString, 
    IEnumerable<string> tables, IEnumerable<string> schemas)
{
  throw new NotImplementedException();
}

您可能想在 official bug tracker 上打开错误报告。

或者，似乎确实有一个更新得多的测试版，您可以尝试一下。 https://www.nuget.org/packages/MySql.Data.EntityFrameworkCore/8.0.9-dmr

Answer 2

挖掘后我发现 .Net Core 2.0 Mysql 连接器无法正常工作经过一些搜索和 RnD，我从 Stack overflow 中找到了，我尝试了它并且有效。

Answer 3

你应该运行这个（来自 Package-Manager-Console）：

Scaffold-DbContext "Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;" 
MySql.Data.EntityFrameworkCore -OutputDir Models

或使用：

dotnet ef dbcontext scaffold

注意：您应该在添加了MySql.Data.EntityFrameworkCore NuGet包的项目中。

Mysql 数据库的.Net Core 2.0 数据库优先方法脚手架-DbContext

.Net Core 2.0 Database First Approach Scaffold-DbContext of Mysql DB

.net

mysql

entity-framework

asp.net-core-webapi

asp.net-core-2.0