private static void CascadingInsert(BlogDbContext db)
{
var post = new Post()
{
Title = "New Title 2",
Body = "New Body.",
User = db.Users.First(),
Comments = new Comment[]
{
new Comment()
{
Text = "First comment.", Date = DateTime.Now
},
new Comment()
{
Text = "Second comment.", Date = DateTime.Now, User = db.Users.First()
}
},
Tags = db.Tags.Take(3).ToList(),
Date = DateTime.Now
};
db.Posts.Add(post);
db.SaveChanges();
}
private static void Delete(BlogDbContext db)
{
var lastPost = db.Posts.OrderByDescending(p => p.ID).First();
db.Comments.RemoveRange(lastPost.Comments);
lastPost.Tags.Clear();
db.Posts.Remove(lastPost);
db.SaveChanges();
Console.WriteLine($"Post #{lastPost.ID} removed.");
}
private static void AddPost(BlogDbContext db)
{
var post = new Post()
{
Title = "New Title",
Body = "New Body.",
Date = DateTime.Now
};
db.Posts.Add(post);
db.SaveChanges();
Console.WriteLine($"Post #{post.ID} created successfully.");
}
private static void ExecuteNativeSQL(BlogDbContext db)
{
var startDate = new DateTime(2016, 05, 19);
var endDate = new DateTime(2016, 06, 14);
var posts = db.Database.SqlQuery<PostData>(
@"SELECT ID, Title, Date FROM Posts WHERE CONVERT(date, Date) BETWEEN {0} AND {1} ORDER BY Date",
startDate,
endDate);
foreach (var post in posts)
{
Console.WriteLine($"#{post.ID}: {post.Title} ({post.Date})");
}
}
private static void Update(BlogDbContext db)
{
var user = db.Users.Where(u => u.Username.Equals("Mariika")).First();
user.PasswordHash = Guid.NewGuid().ToByteArray();
Console.WriteLine($"User #{user.ID} ({user.Username}) has a new random password.");
}
static void Main()
{
var db = new BlogDbContext();
//ListUsers(db);
//ListPosts(db);
//AddPost(db);
//CascadingInsert(db);
//Update(db);
//Delete(db);
//ExecuteNativeSQL(db);
}
private static void ListUsers(BlogDbContext db)
{
foreach (User user in db.Users)
{
Console.WriteLine(user.Username);
}
}
private static void ListPosts(BlogDbContext db)
{
var posts = db.Posts.Select(p => new
{
p.ID,
p.Title,
Comments = p.Comments.Count(),
Tags = p.Tags.Count()
});
Console.WriteLine($"SQL query:\n{posts}\n");
foreach (var post in posts)
{
Console.WriteLine($"#{post.ID} {post.Title}: Comments - {post.Comments}, Tags: {post.Tags}");
}
}
