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