工具的scaffold-dbcontext（数据库上下文脚手架）指令来生成models和context。
指令详细介绍：
Scaffold-DbContext [-Connection] <String> [-Provider] <String> [-OutputDir <String>] [-Context <String>]
[-Schemas <String>] [-Tables <String>] [-DataAnnotations] [-Force] [-Project <String>]
[-StartupProject <String>] [-Environment <String>] [<CommonParameters>]
PARAMETERS
-Connection <String>
Specifies the connection string of the database.
-Provider <String>
Specifies the provider to use. For example, Microsoft.EntityFrameworkCore.SqlServer.
-OutputDir <String>
Specifies the directory to use to output the classes. If omitted, the top-level project directory is used.
-Context <String>
Specifies the name of the generated DbContext class.
-Schemas <String>
Specifies the schemas for which to generate classes.
-Tables <String>
Specifies the tables for which to generate classes.
-DataAnnotations [<SwitchParameter>]
Use DataAnnotation attributes to configure the model where possible. If omitted, the output code will use only the fluent API.
-Force [<SwitchParameter>]
Force scaffolding to overwrite existing files. Otherwise, the code will only proceed if no output files would be overwritten.
-Project <String>
Specifies the project to use. If omitted, the default project is used.
-StartupProject <String>
Specifies the startup project to use. If omitted, the solution's startup project is used.
-Environment <String>
Specifies the environment to use. If omitted, "Development" is used.
示例：
Scaffold-DbContext "Server=.;Database=MvcMovie;Trusted_Connection=True;" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models -Force
Integrated Security（是否集成认证 windows账户认证的意思）