public void DbContext_Keeps_An_Identity_Map_Of_Entities()
{
var db = new MovieDataContext();
var movie1 = db.Movies.Single(m => m.Title == "Jurassic Park");
var movie2 = db.Movies.Single(m => m.Id == 4);
Assert.IsTrue(Object.ReferenceEquals(movie1, movie2));
}
public void Identity_Map_Is_Per_Context()
{
var db1 = new MovieDataContext();
var db2 = new MovieDataContext();
var movie1 = db1.Movies.Single(m => m.Title == "Jurassic Park");
var movie2 = db2.Movies.Single(m => m.Id == 4);
Assert.IsFalse(Object.ReferenceEquals(movie1, movie2));
}
public void Optimisitc_Concurrency_Off_By_Default()
{
var db1 = new MovieDataContext();
var db2 = new MovieDataContext();
var movie1 = db1.Movies.Single(m => m.Title == "Jurassic Park");
var movie2 = db2.Movies.Single(m => m.Title == "Jurassic Park");
movie2.Length += 1;
db2.SaveChanges();
movie1.Length += 2;
db1.SaveChanges();
}
public void DataContext_Is_A_Unit_Of_Work()
{
var db1 = new MovieDataContext();
var db2 = new MovieDataContext();
var movie1 = db1.Movies.Single(m => m.Title == "Jurassic Park");
var movie2 = db2.Movies.Single(m => m.Title == "Jurassic Park");
movie2.Length += 1;
db2.SaveChanges();
movie1 = db1.Movies.Single(m => m.Title == "Jurassic Park");
Assert.AreNotEqual(movie1.Length, movie2.Length);
}
public void Can_Reload_an_Entity()
{
var db1 = new MovieDataContext();
var db2 = new MovieDataContext();
var movie1 = db1.Movies.Single(m => m.Title == "Jurassic Park");
var movie2 = db2.Movies.Single(m => m.Title == "Jurassic Park");
movie2.Length += 1;
db2.SaveChanges();
db1.Entry(movie1).Reload();
Assert.AreEqual(movie1.Length, movie2.Length);
}
public MovieDataSource()
{
_dc = new MovieDataContext();
_dc.Database.Log += s => Debug.WriteLine(s);
}
public void Queries()
{
var db1 = new MovieDataContext();
var query1 = db1.Movies.Where(m => m.Length > 100)
.OrderBy(m => m.ReleaseDate)
.GroupBy(m => m.ReleaseDate.Year)
.ToList();
}
