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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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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Constructor parameter
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var builder = new ConfigurationBuilder()
.AddUserSecrets<MyAppContextFactory>();
var configuration = builder.Build();
var connectionStringBuilder = new SqlConnectionStringBuilder("server=localhost;database=test;user=test;");
connectionStringBuilder.Password = configuration["DbPassword"];
var connectionString = connectionStringBuilder.ConnectionString;
var connectionString = "server=localhost;database=test;user=test;password=****";
var contextOptions = new DbContextOptionsBuilder<MyAppContext>()
.UseMySql(
connectionString,
mySqlOptions => mySqlOptions.ServerVersion("10.5.8-mariadb"))
.Options;
using var context = new MyAppContext(contextOptions);
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| DataAccess/MyAppContext.cs |
public class MyAppContext : DbContext
{
public MyAppContext(DbContextOptions<ApplicationDbContext> options)
: base(options)
{ }
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