public static void AddBookInDB(string author, string title, string isbn, string price, string site)
{
Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
BookstoreDBEntities context = new BookstoreDBEntities();
using (context)
{
Book book = new Book();
if (isbn != null)
{
book.ISBN = long.Parse(isbn);
}
else
{
book.ISBN = null;
}
if (price != null)
{
book.Price = decimal.Parse(price);
}
else
{
book.Price = null;
}
book.WebSite = site;
book.Title = title.ToLower();
context.Books.Add(book);
context.SaveChanges();
// is author in the db
var existingAuthor =
(from a in context.Authors
where a.Name == author.ToLower()
select a).FirstOrDefault();
if (existingAuthor == null)
{
Author newAuthor = new Author()
{
Name = author.ToLower(),
};
context.Authors.Add(newAuthor);
context.SaveChanges();
existingAuthor = newAuthor;
}
book.Authors.Add(existingAuthor);
context.SaveChanges();
}
}
public static void AddComplexInDB(List<string[]> author, string title, string isbn, string price, string site,
List<string[]> reviews)
{
Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
BookstoreDBEntities context = new BookstoreDBEntities();
using (context)
{
List<Author> allAuthors = AddAuthors(context, author);
List<Review> allReviews = AddReviews(context, reviews);
Book book = new Book();
if (isbn != null)
{
book.ISBN = long.Parse(isbn);
}
else
{
book.ISBN = null;
}
if (price != null)
{
book.Price = decimal.Parse(price);
}
else
{
book.Price = null;
}
book.WebSite = site;
book.Title = title.ToLower();
context.Books.Add(book);
context.SaveChanges();
// is author in the db
foreach (var a in allAuthors)
{
book.Authors.Add(a);
context.SaveChanges();
}
foreach (var r in allReviews)
{
book.Reviews.Add(r);
context.Reviews.Add(r);
context.SaveChanges();
}
}
}
public static List<Review> FindByAuther(string autherName)
{
BookstoreDBEntities context = new BookstoreDBEntities();
using (context)
{
var rev =
(from r in context.Reviews
where r.Author.Name == autherName
select r).OrderBy(x => x.CreationDate);
return rev.ToList();
}
}
public static List<Review> FindByDate(string startDateAsString, string endDateAsString)
{
BookstoreDBEntities context = new BookstoreDBEntities();
CultureInfo provider = CultureInfo.InvariantCulture;
DateTime? startDate = DateTime.ParseExact(startDateAsString,"dd-MMM-yyyy",provider);
DateTime? endDate = DateTime.ParseExact(endDateAsString,"dd-MMM-yyyy",provider);
using (context)
{
var rev =
(from r in context.Reviews
where r.CreationDate >= startDate && r.CreationDate <= endDate
select r).OrderBy(x => x.CreationDate).ThenBy(y => y.Text);
WritingResults(rev.ToList());
return rev.ToList();
}
}
public static void SimpleSearch(string title, string auther, string isbn)
{
Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
BookstoreDBEntities context = new BookstoreDBEntities();
using (context)
{
var book =
from b in context.Books
select b;
if (title != null)
{
title = title.ToLower();
book =
from a in context.Books
where a.Title == title
select a;
}
if (isbn != null)
{
isbn = isbn.Trim();
long? myisbn = long.Parse(isbn);
book = book.Where(b => b.ISBN == myisbn);
}
if (auther != null)
{
auther = auther.ToLower().Trim();
book = book.Where(
b => b.Authors.Any(t => t.Name == auther));
}
book = book.OrderBy(b => b.Title);
List<Book> allBooks = book.ToList();
int count = allBooks.Count;
if (count == 0)
{
Console.WriteLine("Nothing found");
}
else
{
Console.WriteLine("{0} books found:", count);
}
foreach (var item in book)
{
var reviewers =
(from x in context.Books
where x.Title == item.Title
select x.Reviews.Count).First();
if ((int)reviewers > 0)
{
Console.WriteLine("{0} --> {1} reviews", item.Title, reviewers);
}
else
{
Console.WriteLine("{0} --> no reviews", item.Title);
}
}
}
}
private static List<Review> AddReviews(BookstoreDBEntities context, List<string[]> reviews)
{
CultureInfo provider = CultureInfo.InvariantCulture;
List<Review> allReviews = new List<Review>();
if (reviews == null)
{
return null;
}
foreach (var rev in reviews)
{
Review review = new Review();
review.Text = rev[0];
if (rev[2] != null)
{
review.CreationDate = DateTime.ParseExact(rev[2], "d-MMM-yyyy", provider);
}
else
{
review.CreationDate = null;
}
if (rev[1] != null)
{
string name = rev[1].ToLower();
var existingAuthor =
(from a in context.Authors
where a.Name == name
select a).FirstOrDefault();
//IMPORTANT
// I am not very sure is the auther of the review is missing from the database what I must do
// so if we must create ne and attach him to the review just uncomment this code or if only
// existing authors must be attached do nothing :)
// thanks
//---------------------------------
if (existingAuthor == null)
{
Author newAuthor = new Author()
{
Name = rev[1].ToLower(),
};
context.Authors.Add(newAuthor);
context.SaveChanges();
existingAuthor = newAuthor;
}
//----------------------------------
review.Author = existingAuthor;
}
else
{
review.Author = null;
}
allReviews.Add(review);
}
return allReviews;
}
private static List<Author> AddAuthors(BookstoreDBEntities context, List<string[]> authors)
{
List<Author> authorList = new List<Author>();
if (authorList == null)
{
return null;
}
foreach (var author in authors)
{
string autherName = author[0].ToLower();
var existingAuthor =
(from a in context.Authors
where a.Name == autherName
select a).FirstOrDefault();
if (existingAuthor == null)
{
Author newAuthor = new Author()
{
Name = author[0].ToLower(),
};
context.Authors.Add(newAuthor);
context.SaveChanges();
existingAuthor = newAuthor;
}
authorList.Add(existingAuthor);
}
return authorList;
}
