Question

我正在使用MySQL DB在.Net Core 2.0中开发WEB API。我正在尝试搭建MySQL DB。我跟着This link (MySQL Official Site)但是当我解雇脚手架命令时我得到了错误，我在下面提到过，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

挖掘后我发现.Net Core 2.0 Mysql Connector无法正常工作在一些搜索和RnD之后我发现堆栈溢出Pomelo Foundation我尝试了它并且它有效。

Answer 2

查看MySQL Connector for .Net的官方源代码，您可以看到它尚未完成，原因如下：

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

您可能想要在official bug tracker上打开错误报告。

或者，似乎有一个更新的测试版本，您可以尝试。 https://www.nuget.org/packages/MySql.Data.EntityFrameworkCore/8.0.9-dmr

Answer 3

您应该运行此命令（从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：您应该位于已添加MySql.Data.EntityFrameworkCore NuGet软件包的项目中。

.Net Core 2.0数据库第一种方法Mysql DB的Scaffold-DbContext

3 个答案: