Entity Framework Core 7
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Entity Framework Core Tools
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# 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 |
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Visual Studio
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Add Entity Framework Core package
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# 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
| appsettings.json |
{
"ConnectionStrings": {
"MariaDb": "server=localhost;database=test;user=test;password=***"
}
}
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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());
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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);
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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
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