Optimisation des requêtes HQL : Persistance des objets

• Voici un exemple d'utilisation de la méthode session.persist() :
• Transaction transaction = null;
• try {
• User bond = new User( "Bond", "007", 7 );
• session.persist( bond );
• Command c = new Command();
• c.setUser( bond );
• session.persist( c );
• CommandLine first = new CommandLine(c, new Article("Bonbon", "Haribo", 0.15), 4);
• session.persist( first.getArticle() );
• session.persist( first );
• CommandLine second = new CommandLine(c, new Article("Cafe", "Nescafe", 0.4), 1);
• session.persist( second.getArticle() );
• session.persist( second );
• session.persist( c );
• System.out.println( "Now == flush" );
• transaction = session.beginTransaction(); // Début de la transaction
• session.flush();
• transaction.commit();
• } catch( Exception exception ) {
• exception.printStackTrace();
• transaction.rollback();
• }

• Dominique Liard - 2006 .. 2019

• <numéro>

Notes:

Si vous avez activé les logs sur les requêtes SQL générées, voici ce qui sera produit :

Now == flush

[main] DEBUG | org.hibernate.SQL | insert into T_Users (Login, Password, ConnectionNumber) values (?, ?, ?) (SQLStatementLogger.java:111)

[main] DEBUG | org.hibernate.SQL | insert into T_Commands (IdUser) values (?) (SQLStatementLogger.java:111)

[main] DEBUG | org.hibernate.SQL | insert into T_Articles (Description, Brand, UnitaryPrice) values (?, ?, ?) (SQLStatementLogger.java:111)

[main] DEBUG | org.hibernate.SQL | insert into T_CommandLines (IdArticle, Quantity) values (?, ?) (SQLStatementLogger.java:111)

[main] DEBUG | org.hibernate.SQL | insert into T_Articles (Description, Brand, UnitaryPrice) values (?, ?, ?) (SQLStatementLogger.java:111)

[main] DEBUG | org.hibernate.SQL | insert into T_CommandLines (IdArticle, Quantity) values (?, ?) (SQLStatementLogger.java:111)

[main] DEBUG | org.hibernate.SQL | insert into T_CommandLinesMapping (IdCommand, IdCommandLine) values (?, ?) (SQLStatementLogger.java:111)

[main] DEBUG | org.hibernate.SQL | insert into T_CommandLinesMapping (IdCommand, IdCommandLine) values (?, ?) (SQLStatementLogger.java:111)

[main] DEBUG | org.hibernate.SQL | delete from T_CommandLinesMapping where IdCommand=? (SQLStatementLogger.java:111)

[main] DEBUG | org.hibernate.SQL | insert into T_CommandLinesMapping (IdCommand, IdCommandLine) values (?, ?) (SQLStatementLogger.java:111)

[main] DEBUG | org.hibernate.SQL | insert into T_CommandLinesMapping (IdCommand, IdCommandLine) values (?, ?) (SQLStatementLogger.java:111)