public void Update(BOOK bookObj)
{
using (var db = new LibDb())
{
var b = db.BOOKs.Include(x => x.AUTHORs).ToList().Find(d => d.ISBN ==
bookObj.ISBN);
b.AUTHORs.Clear();
db.SaveChanges();
}
var newAuthors = bookObj.AUTHORs;
bookObj.AUTHORs = new List <AUTHOR>();
using (var db = new LibDb())
{
db.BOOKs.Attach(bookObj);
db.Entry(bookObj).State = EntityState.Modified;
foreach (var author in newAuthors)
{
db.AUTHORs.Attach(author);
bookObj.AUTHORs.Add(author);
}
db.SaveChanges();
}
}
public void Update(AUTHOR authorObj)
{
using (var db = new LibDb())
{
var b = db.AUTHORs.Include(x => x.BOOKs).ToList().Find(d => d.Aid ==
authorObj.Aid);
b.BOOKs.Clear();
db.SaveChanges();
}
var newBooks = authorObj.BOOKs;
authorObj.BOOKs = new List <BOOK>();
using (var db = new LibDb())
{
db.AUTHORs.Attach(authorObj);
db.Entry(authorObj).State = EntityState.Modified;
foreach (var book in newBooks)
{
db.BOOKs.Attach(book);
authorObj.BOOKs.Add(book);
}
db.SaveChanges();
}
}
public void Update(USER user)
{
using (var db = new LibDb())
{
db.USERs.Attach(user);
db.Entry(user).State = EntityState.Modified;
db.SaveChanges();
}
}
