private static void DeletePostFromDB(BlogDBContext db)
{
var post = db.Posts.FirstOrDefault(p => p.Comments.Count > 0);
var comment = post.Comments.FirstOrDefault();
comment.Users.Comments.Remove(comment);
post.Comments.Remove(comment);
db.SaveChanges();
}
private static void PrintSelectedColumnsFromOrderedUsers(BlogDBContext db)
{
var users = db.Users.OrderBy(u => u.UserName);
foreach (var user in users)
{
Console.WriteLine("Username: "******"Full name: " + user.FullName);
}
}
private static void PrintAuthorOfCertainPost(BlogDBContext db)
{
var post = db.Posts.Find(4);
if (post != null)
{
Console.WriteLine(post.Users.FullName);
Console.WriteLine(post.Title);
}
}
private static void PrintPosts(BlogDBContext db)
{
var posts = db.Posts.ToList();
foreach (var post in posts)
{
Console.WriteLine("title: {0}", post.Title);
Console.WriteLine("authorID: {0}", post.AuthorId);
Console.WriteLine("body: {0}", post.Body);
Console.WriteLine("comments count: {0}", post.Comments.Count);
Console.WriteLine("tags count: {0}", post.Tags.Count);
Console.WriteLine();
}
}
private static void AddPostToDB(BlogDBContext db)
{
Posts post = new Posts()
{
AuthorId = 2,
Title = "title",
Body = "body",
Date = DateTime.Now
};
db.Posts.Add(post);
db.Users.Find(2).Posts.Add(post);
db.SaveChanges();
}
static void Main(string[] args)
{
var db = new BlogDBContext();
//TODO READ
//PrintPosts(db);
//PrintUsers(db);
//PrintSelectedColumnsFromPosts(db);
//PrintSelectedColumnsFromOrderedUsers(db);
//PrintUsersOrderedBy2Columns(db);
//PrintUsersWithAtleast1Post(db);
//PrintUsersWithCorrespondingPostTitles(db);
//PrintAuthorOfCertainPost(db);
//PrintUsersSortedByID(db);
//TODO CREATE
//AddPostToDB(db);
//TODO UPDATE
//UpdateDataFromDB(db);
//TODO REMOVE
//DeletePostFromDB(db);
}
private static void PrintSelectedColumnsFromPosts(BlogDBContext db)
{
var posts = db.Posts.Select(p => new
{
p.Title,
p.Body
});
foreach (var post in posts)
{
Console.WriteLine(post.Title);
Console.WriteLine(post.Body);
Console.WriteLine();
}
}
private static void UpdateDataFromDB(BlogDBContext db)
{
var user = db.Users.Find(2);
user.FullName = "updated";
db.SaveChanges();
}
private static void PrintUsersWithCorrespondingPostTitles(BlogDBContext db)
{
var usersWithPostTitles = db.Users.SelectMany(u => u.Posts, (u, p) => new {u.UserName, p.Title});
foreach (var user in usersWithPostTitles)
{
Console.WriteLine("Username: "******"postTitle name: " + user.Title);
}
}
private static void PrintUsersWithAtleast1Post(BlogDBContext db)
{
var usersWithPosts = db.Users.Where(u => u.Posts.Count > 0);
foreach (var user in usersWithPosts)
{
Console.WriteLine("Username: "******"Full name: " + user.FullName);
Console.WriteLine("Posts count: " + user.Posts.Count);
}
}
private static void PrintUsersSortedByID(BlogDBContext db)
{
var users = db.Users.Where(u => u.Posts.Count > 0).OrderBy(u => u.Id).ThenBy(u => u.Posts.Count);
foreach (var user in users)
{
Console.WriteLine(user.UserName);
Console.WriteLine(user.FullName);
}
}
private static void PrintUsersOrderedBy2Columns(BlogDBContext db)
{
var users = db.Users.OrderBy(u => u.UserName).ThenBy(u => u.FullName);
foreach (var user in users)
{
Console.WriteLine("Username: "******"Full name: " + user.FullName);
}
}
private static void PrintUsers(BlogDBContext db)
{
var users = db.Users.ToList();
foreach (var user in users)
{
Console.WriteLine("name: {0}", user.FullName);
Console.WriteLine("ID: {0}", user.Id);
Console.WriteLine("comments count: {0}", user.Comments.Count);
Console.WriteLine("posts count: {0}", user.Posts.Count);
Console.WriteLine();
}
}
