private static Author CreateOrLoadAuthor(
BookstoreDbEntities context, string name)
{
Author existingAuthor =
(from a in context.Authors
where a.Name.ToLower() == name.ToLower()
select a).FirstOrDefault();
if (existingAuthor != null)
{
return existingAuthor;
}
var newAuthor = new Author();
newAuthor.Name = name;
context.Authors.Add(newAuthor);
context.SaveChanges();
return newAuthor;
}
/*Task 3: */
//Note: Please note that the connection strings must be corrected for each task. Thank you !
static void Main(string[] args)
{
var dbCon = new BookstoreDbEntities();
using (dbCon)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("../../simple-books.xml");
string xPathQuery = "/catalog/book";
XmlNodeList books = xmlDoc.SelectNodes(xPathQuery);
//Reading the XML with XPath
foreach (XmlNode book in books)
{
var bookEntry = new Book();
bookEntry.title = book.GetChildText("title");
if (bookEntry.title == null)
{
throw new ArgumentException("Provided book does not have an title!");
}
var authors = book.SelectNodes("author");
if (authors.Count == 0)
{
throw new ArgumentException("Provided book does not have an author(s)!");
}
//Making sure that all the authors are processed.
foreach (XmlNode author in authors)
{
var name = author.InnerText;
bookEntry.Authors.Add(CreateOrLoadAuthor(dbCon, name));
}
var price = book.GetChildText("price");
if (price != null)
{
bookEntry.Price = decimal.Parse(price);
}
else
{
bookEntry.Price = null;
}
var webSite = book.GetChildText("web-site");
if (webSite != null)
{
bookEntry.Website = book.GetChildText("web-site");
}
var isbn = book.GetChildText("isbn");
if (isbn != null)
{
bookEntry.ISBN = book.GetChildText("isbn");
}
dbCon.Books.Add(bookEntry);
}
dbCon.SaveChanges();
}
}
static void Main(string[] args)
{
var dbCon = new BookstoreDbEntities();
/*Using the context from Task 7. If performance test must be done, please comment the task 7 part. Thank you! */
var logContext = new LogContext();
Database.SetInitializer(new MigrateDatabaseToLatestVersion
<LogContext, Configuration>());
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("../../reviews-queries.xml");
string xPathQuery = "/review-queries/query";
XmlNodeList queries = xmlDoc.SelectNodes(xPathQuery);
string fileName = "../../reviews-search-results.xml";
Encoding encoding = Encoding.GetEncoding("windows-1251");
using (XmlTextWriter writer = new XmlTextWriter(fileName, encoding))
{
writer.Formatting = Formatting.Indented;
writer.IndentChar = '\t';
writer.Indentation = 1;
writer.WriteStartDocument();
writer.WriteStartElement("search-results");
foreach (XmlNode query in queries)
{
//Task 7 Call Method
UpdateXMLToLogDB(logContext, query);
if (query.Attributes["type"].Value == "by-period")
{
var startDate = DateTime.Parse(query.GetChildText("start-date"));
var endDate = DateTime.Parse(query.GetChildText("end-date"));
if (startDate == null || endDate == null)
{
throw new ArgumentException("Stard date and end date are mendatory!");
}
if (startDate > endDate)
{
var reviews = from r in dbCon.Reviews.Include("Books")
select r;
reviews = reviews.Where(r => r.DateOfCreation < startDate && r.DateOfCreation > endDate)
.OrderBy(r => r.DateOfCreation).ThenBy(r => r.Text);
WriteResults(writer, reviews);
}
else
{
var reviews = from r in dbCon.Reviews.Include("Books")
select r;
reviews = reviews.Where(r => r.DateOfCreation > startDate && r.DateOfCreation < endDate)
.OrderBy(r => r.DateOfCreation).ThenBy(r => r.Text);
WriteResults(writer, reviews);
}
}
else if (query.Attributes["type"].Value == "by-author")
{
var authorName = query.GetChildText("author-name");
if (authorName == null)
{
throw new ArgumentException("Author's Name is mendatory!");
}
var author = CreateOrLoadAuthor(dbCon, authorName);
var reviews = from r in dbCon.Reviews.Include("Books")
select r;
reviews = reviews.Where(r => r.AuthorId == author.Id)
.OrderBy(r => r.DateOfCreation).ThenBy(r => r.Text);
WriteResults(writer, reviews);
}
}
writer.WriteEndElement();
}
}
/*Task 4*/
static void Main(string[] args)
{
//As Nakov told us book ISBN should not be unique, thus, same books can be added. It's not a bug, its a feature :)
var dbCon = new BookstoreDbEntities();
using (dbCon)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("../../complex-books.xml");
string xPathQuery = "/catalog/book";
XmlNodeList books = xmlDoc.SelectNodes(xPathQuery);
//Reading the XML with XPath
foreach (XmlNode book in books)
{
//Processing each query in different transaction, so we can be sure that if one fails, the correct ones will be processed.
//There should be an easier way, but for now this works as well :)
var tran = new TransactionScope();
using (tran)
{
try
{
var bookEntry = new Book();
bookEntry.title = book.GetChildText("title");
if (bookEntry.title == null)
{
throw new ArgumentException("Provided book does not have an title!");
}
var authors = book.SelectNodes("authors/author");
if (authors.Count == 0)
{
throw new ArgumentException("Cannot create book with missing author!");
}
foreach (XmlNode author in authors)
{
var name = author.InnerText;
bookEntry.Authors.Add(CreateOrLoadAuthor(dbCon, name));
}
foreach (XmlNode review in book.SelectNodes("reviews/review"))
{
string authorName = null;
var currentReview = new Review();
DateTime date = DateTime.Now;
if (review.Attributes["author"] != null)
{
authorName = review.Attributes["author"].Value;
var author = CreateOrLoadAuthor(dbCon, authorName);
currentReview.AuthorId = author.Id;
}
if (review.Attributes["date"] != null)
{
date = DateTime.Parse(review.Attributes["date"].Value);
}
var text = review.InnerText;
currentReview.DateOfCreation = date;
currentReview.Text = text;
dbCon.Reviews.Add(currentReview);
dbCon.SaveChanges();
bookEntry.Reviews.Add(currentReview);
}
var price = book.GetChildText("price");
if (price != null)
{
bookEntry.Price = decimal.Parse(price);
}
else
{
bookEntry.Price = null;
}
var webSite = book.GetChildText("web-site");
if (webSite != null)
{
bookEntry.Website = book.GetChildText("web-site");
}
var isbn = book.GetChildText("isbn");
if (isbn != null)
{
bookEntry.ISBN = book.GetChildText("isbn");
}
dbCon.Books.Add(bookEntry);
dbCon.SaveChanges();
}
catch (Exception ex)
{
Console.WriteLine("Transaction failed to complete with the following error: \n" + ex.Message.ToString());
Environment.Exit(2);
}
tran.Complete();
}
}
}
}
/*Task 5*/
static void Main(string[] args)
{
/*Using the context from Task 7*/
var logContext = new LogContext();
Database.SetInitializer(new MigrateDatabaseToLatestVersion
<LogContext, Configuration>());
var dbCon = new BookstoreDbEntities();
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("../../simple-query.xml");
string title = null;
string author = null;
string isbn = null;
XmlNodeList queries = xmlDoc.SelectNodes("/query");
foreach (XmlNode query in queries)
{
title = query.GetChildText("title");
author = query.GetChildText("author");
isbn = query.GetChildText("isbn");
//Update the query XML to the log DB. May slow things a little bit...
// var log = new CustomLogs();
// log.Date = DateTime.Now;
// log.QueryXML = query.OuterXml;
// logContext.Logs.Add(log);
// logContext.SaveChanges();
}
var booksQuery =
from b in dbCon.Books.Include("Authors")
select b;
if (title != null)
{
booksQuery =
from b in dbCon.Books
where b.title.ToLower() == title.ToLower()
select b;
}
if (author != null)
{
booksQuery = booksQuery.Where(
b => b.Authors.Any(t => t.Name.ToLower() == author.ToLower()));
}
if (isbn != null)
{
booksQuery = booksQuery.Where(
b => b.ISBN == isbn);
}
booksQuery = booksQuery.OrderBy(b => b.title);
if (booksQuery.Count() == 0)
{
Console.WriteLine("Nothing Found");
}
else
{
foreach (var item in booksQuery)
{
string reviews = string.Empty;
if (item.Reviews.Count() > 1)
{
reviews = item.Reviews.Count() + " review";
}
else if (item.Reviews.Count() > 2)
{
reviews = item.Reviews.Count() + " reviews";
}
else
{
reviews = " no reviews";
}
Console.WriteLine(item.title + "--> " + reviews);
}
}
}
