public static void RemovePurchase(Purchase purchase)
{
try
{
string query = "DELETE Purchase WHERE PurchaseID = " + purchase.PurchaseID;
SqlConnection connection = new SqlConnection(ConnectionString);
SqlCommand cmd = new SqlCommand(query, connection);
connection.Open();
cmd.ExecuteNonQuery();
connection.Close();
}
catch (Exception ex)
{
string errmsg = "Fehler beim Löschen des Verkaufs.\n\n";
errmsg += "DatabaseHandler.RemovePurchase(purchase): " + ex.ToString();
throw new Exception(errmsg);
}
}
public static ObservableCollection<Purchase> GetPurchases(Profile profile)
{
_loadPurchasesUserCache = new List<User>();
_loadPurchasesArticleCache = new List<Article>();
ObservableCollection<Purchase> purchases = new ObservableCollection<Purchase>();
GetPurchaseArticleCache = new List<Article>();
GetPurchaseUserCache = new List<User>();
int currentPurchaseId = -1;
Purchase p = null;
Cart c = null;
User u = null;
Article a = null;
try
{
SqlConnection connection = new SqlConnection(ConnectionString);
SqlCommand cmd = new SqlCommand("SELECT PurchaseID, UserID, ArticleID, ArticleCount, [Date] FROM vPurchaseProfile WHERE ProfileID = " + profile.ProfileID + " ORDER BY [Date] DESC", connection);
connection.Open();
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
int pid = Convert.ToInt32(reader["PurchaseID"]);
int artId = Convert.ToInt32(reader["ArticleID"]);
// article cache
a = (from art in _loadPurchasesArticleCache where art.ArticleID == artId select art as Article).FirstOrDefault();
if (a == null) { a = GetArticle(artId); _loadPurchasesArticleCache.Add(a); }
if (currentPurchaseId == -1 || pid != currentPurchaseId) // create new purchase object
{
int userId = Convert.ToInt32(reader["UserID"]);
if (p != null) purchases.Add(p);
// user cache
u = (from usr in _loadPurchasesUserCache where usr.UserID == userId select usr as User).FirstOrDefault();
if (u == null) { u = GetUser(userId); _loadPurchasesUserCache.Add(u); }
currentPurchaseId = pid;
c = new Cart();
p = new Purchase(pid, c, u, Convert.ToDateTime(reader["Date"]));
c.Add(a, Convert.ToInt32(reader["ArticleCount"]));
}
else // add article to purchase object
{
c.Add(a, Convert.ToInt32(reader["ArticleCount"]));
}
}
if (!purchases.Contains(p) && p != null) purchases.Add(p);
connection.Close();
}
catch (Exception ex)
{
string errmsg = "Fehler beim Abrufen der Verkäufe.\n\n";
errmsg += "DatabaseHandler.GetPurchases(profile): " + ex.ToString();
throw new Exception(errmsg);
}
return purchases;
}