Entity Framework Core 7

Entity Framework Core Tools

# test if Entity Framework Core Tools has been installed dotnet ef # be sure to run the previous command in the folder of the project where EF has been added # dotnet ef must be installed as a global or local tool dotnet tool install --global dotnet-ef # installed in ~/.dotnet/tools # Add ~/.dotnet/tools to PATH # update dotnet tool update --global dotnet-ef

Visual Studio View → Other Windows → Package Manager Console Default Project = the one containing the entity configurations Startup Project = the one containing the sql server configuration

Add Entity Framework Core package

# sql server dotnet add package Microsoft.EntityFrameworkCore.SqlServer dotnet add package Microsoft.EntityFrameworkCore.Design # mysql dotnet add package Pomelo.EntityFrameworkCore.MySql dotnet add package Microsoft.EntityFrameworkCore.Design

Data Providers

Provider	Package NuGet	Connection String
SQL Server	Microsoft.EntityFrameworkCore.SqlServer	Server=(localdb)\\MSSQLLocalDB;Database=MyDb;Integrated Security=True;MultipleActiveResultSets=True; Server=localhost;Database=MyDb;User=sa;Password=pwd;
MySQL / MariaDB	Pomelo.EntityFrameworkCore.MySql	server=localhost;database=MyDb;user=root;password=pwd
PostgreSQL	Npgsql.EntityFrameworkCore.PostgreSQL	Host=localhost;Database=MyDb;Username=root;Password=pwd
InMemory	Microsoft.EntityFrameworkCore.InMemory	databaseName: "test_database"
Sqlite	Microsoft.EntityFrameworkCore.Sqlite	Data Source=/tmp/file.db

Connection string

• Configuration file and secrets

appsettings.json

{ "ConnectionStrings": { "MariaDb": "server=localhost;database=test;user=test;password=***" } }

Dependency injection (ASP.Net Core)

MariaDb / MySql

Program.cs

var connectionString = builder.Configuration.GetConnectionString("MariaDb"); var serverVersion = new MariaDbServerVersion(new Version(10, 11, 4)); builder.Services.AddDbContext<MyAppContext>( dbContextOptions => dbContextOptions .UseMySql(connectionString, serverVersion) // TODO The following three options help with debugging, but should be changed or removed for production. .LogTo(Console.WriteLine, LogLevel.Information) .EnableSensitiveDataLogging() .EnableDetailedErrors());

SQL Server

• [Manager]

Program.cs

var connectionString = builder.Configuration.GetConnectionString("SqlServer"); // store the db password in the secret storage for the dev environment var connectionStringWithoutPassword = builder.Configuration.GetConnectionString("SqlServer"); var connectionStringBuilder = new SqlConnectionStringBuilder(connectionStringWithoutPassword); // Package: System.Data.SqlClient connectionStringBuilder.Password = builder.Configuration["SqlServerPassword"]; var connectionString = connectionStringBuilder.ConnectionString; builder.Services.AddDbContext<MyAppContext>( dbContextOptions => dbContextOptions .UseSqlServer(connectionString);

DbContext OnConfiguring

DataAccess/MyAppContext.cs

public class MyAppContext : DbContext { protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) { optionsBuilder.UseSqlServer("server=localhost;database=test;user=test;password=***"); // hard-coded connection string optionsBuilder.UseMySql("name=ConnectionStrings:MariaDb", ServerVersion.Parse("10.11.4-mariadb")); // connection string in the appsettings.json optionsBuilder.UseSqlServer(ConfigurationManager.ConnectionStrings["SqlServerConnectionString"].ConnectionString); // WPF