Databases
StackOverflow2013
Postsdbo
POjava/hibernate query issue
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POjava/hibernate query issue
    primarykey
    data
    text
    <p>I am having problem trying to execute a SQL/HQL statement using the WHERE clause.</p> <p>The application connects and executes this method when called without errors:</p> <pre><code>public void listPlayers( ){ Session session = sessionFactory.openSession(); Transaction tx = null; try{ tx = session.beginTransaction(); List players = session.createQuery("FROM Player").list(); for (Iterator iterator = players.iterator(); iterator.hasNext();){ Player player = (Player) iterator.next(); String tmpMessage = player.getFirstName().toString(); System.out.println(tmpMessage); writer.write("First Name: "+player.getPlayerName()+", Wealth: "+player.getWealth()+"\r\n"); writer.flush(); } tx.commit(); }catch (HibernateException e) { if (tx!=null) tx.rollback(); e.printStackTrace(); }finally { session.close(); } } </code></pre> <p>BUT, when I try to do this; I get an error: player_name field not found:</p> <pre><code> public void loadPlayer(String usr){ Session session = sessionFactory.openSession(); Transaction tx = null; try{ tx = session.beginTransaction(); String hql = "SELECT * FROM Player P WHERE P.player_name = "+usr; Query query = session.createQuery(hql); List players = query.list(); for (Iterator iterator = players.iterator(); iterator.hasNext();){ Player player = (Player) iterator.next(); System.out.print(" Location: " + player.getLocation()); System.out.println(" Wealth: " + player.getWealth()); } tx.commit(); }catch (HibernateException e) { if (tx!=null) tx.rollback(); e.printStackTrace(); }finally { session.close(); } } </code></pre> <p>My mySQL database has a Table named Player, with pID, player_name, location, wealth as column values</p> <p>I am attempting to pass playername to the loadPlayer(String username) method so it can look up all information associated with the player and write back to socket. What am I doing wrong here?</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USuser2556304
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COalso the issue is i think your trying to map the table column name "player_name" whereas you need to put the actual java class instance variable name when writing your HQL. Also you need to pass in parameters as highlighted by quartzde. You cannot simply concatenate strings as writing RAW sql.
      singulars
      1. POjava/hibernate query issue
      1. USdinukadev
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload