private static void CascadingInsert()
{
BlogDBContext db = new BlogDBContext();
Post post = new Post()
{
Title = "New Post Title",
Date = DateTime.Now,
Body = "This post has comments and tags",
User = db.Users.First(),
Comments = new Comment[]
{
new Comment()
{
Text = "Comment 1",
Date = DateTime.Now
},
new Comment()
{
Text = "Comment 2",
Date = DateTime.Now,
User = db.Users.First()
}
},
Tags = db.Tags.Take(3).ToList()
};
db.Posts.Add(post);
db.SaveChanges();
}
private static void TestDbContext()
{
BlogDBContext db = new BlogDBContext();
foreach (User user in db.Users)
{
Console.WriteLine(user.Username);
}
}
private static void UpdateExistingData()
{
BlogDBContext db = new BlogDBContext();
User user = db.Users
.Where(u => u.Username == "maria")
.First();
user.PasswordHash = Guid.NewGuid().ToByteArray();
db.SaveChanges();
Console.WriteLine("User #{0} ({1}) has a new random password.",
user.ID, user.Username);
}
private static void DeleteExistingData()
{
BlogDBContext db = new BlogDBContext();
Post lastPost = db.Posts
.OrderByDescending(p => p.ID)
.First();
db.Comments.RemoveRange(lastPost.Comments);
lastPost.Tags.Clear();
db.Posts.Remove(lastPost);
db.SaveChanges();
Console.WriteLine($"Deleted post #{lastPost.ID}");
}
private static void CreateNewData()
{
BlogDBContext db = new BlogDBContext();
Post post = new Post()
{
Title = "New Title",
Body = "New Post Body",
Date = DateTime.Now
};
db.Posts.Add(post);
db.SaveChanges();
Console.WriteLine("Post #{0} created.", post.ID);
}
private static void QueryData()
{
BlogDBContext db = new BlogDBContext();
var postsQuery = db.Posts.Select(p => new
{
p.ID,
p.Title,
Comments = p.Comments.Count(),
Tags = p.Tags.Count()
});
Console.WriteLine("SQL query:\n{0}\n", postsQuery);
foreach (var p in postsQuery)
{
Console.WriteLine($"{p.ID} {p.Title} ({p.Comments} comments, {p.Tags} tags)");
}
}
private static void ExecuteNativeSQL()
{
BlogDBContext db = new BlogDBContext();
DateTime startDate = new DateTime(2016, 05, 19);
DateTime 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 (PostData p in posts)
{
Console.WriteLine($"#{p.ID}: {p.Title} ({p.Date})");
}
}
