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Support for the EDMX file was dropped in Entity Framework Core in favour of using commands to reverse-engineering files for the model from an existing database schema. This approach is known as Code First to an existing database. Feb 12, 2018 This video shows you how to access a MySQL database from a.NET Core application by using Entity Framework Core (EF Core for short). In the future, there will be.
Scaffolding a database produces an Entity Framework model from an existing database. The resulting entities are created and mapped to the tables in the specified database. This feature was introduced in MySQL Connector/NET 6.10.2-beta and 8.0.8-dmr; however, scaffolding is not supported with all versions of Connector/NET (see Table 7.2, “Supported versions of Entity Framework Core”).
The
Design
package for scaffolding a database is part of the main package in EF Core 2.0 (or later) and no longer separate. If you are upgrading from EF Core 1.1 to EF Core 2.0 or 2.1, you must remove the MySql.Data.EntityFrameworkCore.Design
package manually. NuGet packages have the ability to select the best target for a project, which means that NuGet will install the libraries related to that specific framework version. Free skype download for mac os x 10.8.5.
There are two different ways to scaffold an existing database:
This section shows how to scaffold the
sakila
database using both approaches.- Mac os x mountain lion theme for windows 7 download. Any implementation of .NET Standard (see https://dotnet.microsoft.com/platform/dotnet-standard#versions)
- Visual Studio 2017 version 15.7 (required for Using Package Manager Console in Visual Studio)
- MySQL Server 5.7
sakila
database sample (see https://dev.mysql.com/doc/sakila/en/)
When upgrading ASP.NET Core applications to a newer framework, be sure to use the appropriate EF Core version (see https://docs.microsoft.com/en-us/aspnet/core/migration/30-to-31?view=aspnetcore-3.1).
- Initialize a valid .NET Core project and console application using the .NET Core command-line interface (CLI) and then change to the newly created folder (
sakilaConsole
). - Add the MySQL NuGet package for EF Core using the CLI. For example, use the following command to add the
MySql.Data.EntityFrameworkCore v8.0.20
package:The version (for example,--version 8.0.20
) must match the actual Connector/NET version you are using. For current version information, see Table 7.2, “Supported versions of Entity Framework Core”. - Add the following
Microsoft.EntityFrameworkCore.Design
Nuget package: - If you are using EF Core 2.0, add a reference to
Microsoft.EntityFrameworkCore.Tools.DotNet
as aDotNetCliToolReference
entry in thesakilaConsole.csproj
file as follows:The .NET tools are included in the .NET Core 2.1 SDK (and later) and are not required or supported for EF Core 2.1. If this is an upgrade, remove the following reference to that package from the .csproj
file (version 2.0.3 in this example) : - Restore dependencies and project-specific tools that are specified in the project file as follows:
- How do i hack a mac book. Create the Entity Framework Core model by executing the following command (adjust the connection-string values to match your settings for the
user=
andpassword=
options): Key generator for corel draw x4.To validate that the model has been created, open the newsakila
folder. You should see files corresponding to all tables mapped to entities. In addition, look for thesakilaContext.cs
file, which contains theDbContext
for this database.
Scaffolding a Database Using Package Manager Console in Visual Studio
- Open Visual Studio and create a new Console App (.NET Core) for C#.
- Add the MySQL NuGet package for EF Core using the Package Manager Console. For example, use the following command to add the
MySql.Data.EntityFrameworkCore v8.0.20
package:The version (for example,-Version 8.0.20
) must match the actual Connector/NET version you are using. For current version information, see Table 7.2, “Supported versions of Entity Framework Core”. - Install the following NuGet packages by selecting either Package Manager Console or Manage NuGet Packages for Solution from the Tools and then NuGet Package Manager menu:
Microsoft.EntityFrameworkCore.Design
Microsoft.EntityFrameworkCore.Tools version 2.0.3
(for EF Core 2.0)The .NET tools are included in the .NET Core 2.1 SDK (and later) and are not required or supported for EF Core 2.1. If this is an upgrade, remove the reference to that package from the .csproj
file (version 2.0.3 in this example) :
- Open Package Manager Console and enter the following command at the prompt to create the entities and
DbContext
for thesakila
database (adjust the connection-string values to match your settings for theuser=
andpassword=
options):Visual Studio creates a newsakila
folder inside the project, which contains all the tables mapped to entities and thesakilaContext.cs
file.
It is possible to specify the exact tables in a schema to use when scaffolding database and to omit the rest. The command-line examples that follow show the parameters needed for filtering tables.
.NET Core CLI:
Package Manager Console in Visual Studio:
When scaffolding a database, you can use more than one schema or database. Note that the account used to connect to the MySQL server must have access to each schema to be included within the context. Multiple-schema functionality was introduced in Connector/NET 6.10.3-rc and 8.0.9-dmr releases.
The following command-line examples show how to incorporate the
sakila
and world
schemas within a single context. .NET Core CLI:
Package Manager Console in Visual Studio:
-->In this tutorial, you create a .NET Core console app that performs data access against a SQLite database using Entity Framework Core.
You can follow the tutorial by using Visual Studio on Windows, or by using the .NET Core CLI on Windows, macOS, or Linux.
View this article's sample on GitHub.
Prerequisites
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Install the following software:
- .NET Core SDK.
- Visual Studio 2019 version 16.3 or later with this workload:
- .NET Core cross-platform development (under Other Toolsets)
Create a new project
- Open Visual Studio
- Click Create a new project
- Select Console App (.NET Core) with the C# tag and click Next
- Enter EFGetStarted for the name and click Create
Install Entity Framework Core
To install EF Core, you install the package for the EF Core database provider(s) you want to target. This tutorial uses SQLite because it runs on all platforms that .NET Core supports. For a list of available providers, see Database Providers.
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- Run the following commands:
Tip: You can also install packages by right-clicking on the project and selecting Manage NuGet Packages
Create the model
Define a context class and entity classes that make up the model.
- In the project directory, create Model.cs with the following code
- Right-click on the project and select Add > Class
- Enter Model.cs as the name and click Add
- Replace the contents of the file with the following code
EF Core can also reverse engineer a model from an existing database.
Tip: This application intentionally keeps things simple for clarity. Connection strings should not be stored in the code for production applications. You may also want to split each C# class into its own file.
Create the database
The following steps use migrations to create a database. https://downtownpowerup.weebly.com/installing-hp-scan-software-on-mac.html.
- Run the following commands:This installs dotnet ef and the design package which is required to run the command on a project. The
migrations
command scaffolds a migration to create the initial set of tables for the model. Thedatabase update
command creates the database and applies the new migration to it.
- Run the following commands in Package Manager Console (PMC)This installs the PMC tools for EF Core. The
Add-Migration
command scaffolds a migration to create the initial set of tables for the model. TheUpdate-Database
command creates the database and applies the new migration to it.
Create, read, update & delete
Entity Framework Core For Mac Os X Mysql Server
- Open Program.cs and replace the contents with the following code:
Run the app
Visual Studio uses an inconsistent working directory when running .NET Core console apps. (see dotnet/project-system#3619) This results in an exception being thrown: no such table: Blogs. To update the working directory:
- Right-click on the project and select Edit Project File
- Just below the TargetFramework property, add the following:
- Save the file
Now you can run the app: Mac os x cleaner. Mac os x el capitan skin for rocketdock.
- Debug > Start Without Debugging
Next steps
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- Follow the ASP.NET Core Tutorial to use EF Core in a web app
- Learn more about LINQ query expressions
- Configure your model to specify things like required and maximum length
- Use Migrations to update the database schema after changing your model