Hi!
I am mapping several Tables from a MS-SQL Server 2012 and as long as I just map a few data everything works pretty fast. I was able to map two Tables: Orders and Groups (n:1 - every order has a group, but a group can be assigned to different orders).
So far everything is straight forward and even with the output via
I am able to display 121 rows of data in 1.5sec. (And that's just a Testserver).
But now the problem occurs: Every Order has several order-lines which I fetch from the view OrderLineView:
Due to it is not possible to join Tables with FK from OrderLines -->PK from Articles I decided to build an updateable view and map it. As seen below the View consists of a Table with the order-lines (updateable) and the article-view (For those values I've set
).
Actually it worked, but the time it takes is a catastrophe. (By the way: I have no need for the
, I never call it, but I haven't seen a way to get rid of it)
(I tried to change from
to
in Order but the result is pretty much the same.)
An order-line has the following "columns":
I did some research already and found an issue at Stackoverflow: http://stackoverflow.com/questions/6...ng-very-slowly.
But just adding a constructor didn't solve the problem for me...
All together I have about ~300 order-lines which fetch their data from the Article-View (which much bigger, I avoid mapping it).
In my NetBeans-Output I get for the output of everything:
So how am I able to increase the efficiency of my Application? Is there something else necessary which has to be done?
So far some other (maybe) relevant information: I use the jTDS-Driver and c3p0.
My query-function is quite simple (but maybe deprecated?):
Thank you!
I am mapping several Tables from a MS-SQL Server 2012 and as long as I just map a few data everything works pretty fast. I was able to map two Tables: Orders and Groups (n:1 - every order has a group, but a group can be assigned to different orders).
So far everything is straight forward and even with the output via
Code:
System.out.printlnBut now the problem occurs: Every Order has several order-lines which I fetch from the view OrderLineView:
Code:
@OneToMany(mappedBy = "ol", fetch = FetchType.LAZY)
private List<Orderlineview> orderlines = new ArrayList<Orderlineview>();Code:
@Column(name = "Price", updatable = false)Actually it worked, but the time it takes is a catastrophe. (By the way: I have no need for the
Code:
private Orders ol(I tried to change from
Code:
FetchType.LAZYCode:
FetchType.EAGERAn order-line has the following "columns":
Code:
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ol_ID")
private Integer ol_ID;
private String artnr;
private Integer amount;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "orderline_ID_FK", referencedColumnName = "orderline_ID_PK")
private Orders ol;
@Column(name = "Description", updatable = false)
private String description;
@Column(name = "Price",updatable = false)
private Double price;But just adding a constructor didn't solve the problem for me...
All together I have about ~300 order-lines which fetch their data from the Article-View (which much bigger, I avoid mapping it).
In my NetBeans-Output I get for the output of everything:
Code:
End after 1154017ms
BUILD SUCCESSFUL (total time: 19 minutes 14 seconds)So far some other (maybe) relevant information: I use the jTDS-Driver and c3p0.
My query-function is quite simple (but maybe deprecated?):
Code:
private static void query() {
Session session = InitSessionFactory.getSessionFactory().getCurrentSession();
Transaction tx = session.beginTransaction();
String hql = "SELECT O FROM Orders O";
Query query = session.createQuery(hql);
List order_elements = query.list();
for (Iterator iter = order_elements.iterator(); iter.hasNext();) {
Order element = (Order) iter.next();
//log.debug(element);
System.out.println(element);
}
tx.commit();
}