private static void CreateAndAddReviewInDb(
BookStoreDBEntities db, ICollection<Author> authors, ICollection<Rewiew> reviews,
string title, string isbn, decimal price, string webSite)
{
var bookInDb = (from b in db.Books
where b.BookTitle == title
select b).FirstOrDefault();
if (bookInDb == null)
{
foreach (var a in authors)
{
CreateAndAddBookInDb(db, a.AuthorName, title, isbn, price, webSite);
}
}
bookInDb = (from b in db.Books
where b.BookTitle == title
select b).FirstOrDefault();
if (authors != null)
{
foreach (var a in authors)
{
bookInDb.Authors.Add(a);
db.SaveChanges();
}
}
if (reviews != null)
{
foreach (var review in reviews)
{
bookInDb.Rewiews.Add(review);
db.Rewiews.Add(review);
db.SaveChanges();
}
}
}
private static void CreateAndAddBookInDb(
BookStoreDBEntities db, string author, string title, string isbn, decimal price, string webSite)
{
ICollection<Author> bookAuthors = new List<Author>();
// Check is title exist
var titleInDb = (from bookDb in db.Books
where bookDb.BookTitle == title
select bookDb).FirstOrDefault();
var authorInDb = (from authorDb in db.Authors
where authorDb.AuthorName == author
select authorDb).FirstOrDefault();
if (titleInDb != null && authorInDb != null)
{
return;
}
if (authorInDb == null)
{
Author newAuthor = new Author() { AuthorName = author };
db.Authors.Add(newAuthor);
db.SaveChanges();
bookAuthors.Add(newAuthor);
if (titleInDb != null)
{
titleInDb.Authors.Add(newAuthor);
}
}
Book newBook = new Book() { Authors = bookAuthors, BookTitle = title };
if (isbn != null)
{
newBook.ISBN = isbn;
var isbnInDb = (from b in db.Books
where b.ISBN == isbn
select b).FirstOrDefault();
if (isbnInDb != null)
{
throw new ApplicationException("Duplicated ISBN");
}
}
if (price != 0m)
{
newBook.Price = price;
}
if (webSite != null)
{
newBook.WebSite = webSite;
}
db.Books.Add(newBook);
db.SaveChanges();
}
private static void ParseComplexXml()
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("../../complex-books.xml");
var books = xmlDoc.DocumentElement.ChildNodes;
using (var db = new BookStoreDBEntities())
{
foreach (XmlNode book in books)
{
TransactionScope tran = new TransactionScope(
TransactionScopeOption.Required,
new TransactionOptions()
{
IsolationLevel = IsolationLevel.RepeatableRead
});
using (tran)
{
string title = book["title"].InnerText.Trim();
ICollection<Author> authors = null;
if (book.SelectSingleNode("authors") != null)
{
authors = new List<Author>();
foreach (XmlNode author in book.SelectSingleNode("authors").ChildNodes)
{
string authorName = null;
if (author.InnerText != null)
{
authorName = author.InnerText.Trim();
}
var authorInDb = (from a in db.Authors
where a.AuthorName == authorName
select a).FirstOrDefault();
if (authorInDb == null && authorName != null)
{
Author newAuthor = new Author() { AuthorName = authorName };
db.Authors.Add(newAuthor);
db.SaveChanges();
authors.Add(newAuthor);
}
}
}
string webSite = null;
if (book.SelectSingleNode("web-site") != null)
{
webSite = book["web-site"].InnerText.Trim();
}
ICollection<Rewiew> reviews = null;
if (book.SelectSingleNode("reviews") != null)
{
reviews = new List<Rewiew>();
foreach (XmlNode review in book.SelectSingleNode("reviews").ChildNodes)
{
Rewiew currentReview = new Rewiew();
string reviewText = null;
if (review.InnerText != null)
{
reviewText = review.InnerText.Trim();
currentReview.RewiewText = reviewText;
}
string authorName = null;
if (review.Attributes["author"] != null)
{
authorName = review.Attributes["author"].Value;
}
if (authorName != null)
{
authorName = authorName.Trim();
var authorInDb = (from a in db.Authors
where a.AuthorName == authorName
select a).FirstOrDefault();
if (authorInDb == null)
{
Author newAuthor = new Author() { AuthorName = authorName };
db.Authors.Add(newAuthor);
db.SaveChanges();
currentReview.Author = newAuthor;
}
else
{
currentReview.Author = authorInDb;
}
}
DateTime reviewDate = DateTime.Now;
if (review.Attributes["date"] != null)
{
reviewDate = DateTime.Parse(review.Attributes["date"].Value);
}
currentReview.RewiewDate = reviewDate;
reviews.Add(currentReview);
}
}
string isbn = null;
if (book.SelectSingleNode("isbn") != null)
{
isbn = book["isbn"].InnerText.Trim();
}
decimal price = 0m;
if (book.SelectSingleNode("price") != null)
{
price = decimal.Parse(book["price"].InnerText.Trim(), CultureInfo.InvariantCulture);
}
CreateAndAddReviewInDb(db, authors, reviews, title, isbn, price, webSite);
tran.Complete();
}
}
}
}
