Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about how to use the configuration class configuration database in hibernate. The article is rich in content and analyzes and describes it from a professional point of view. I hope you can get something after reading this article.

Provides the hibernate utility class for session:

Import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.boot.registry.StandardServiceRegistryBuilder;import org.hibernate.cfg.Configuration;public class HibernateUtils1 {private static Configuration cfg = null; private static SessionFactory factory = null; private static Session session = null Static {cfg = new Configuration () .setProperty ("hibernate.connection.driver_class", "com.mysql.jdbc.Driver") .setProperty ("hibernate.connection.url", "jdbc:mysql://localhost:3306/aleavesystem?pinGlobalTxToPhysicalConnection=true&characterEncoding=UTF-8") .setProperty ("hibernate.connection.username") "root") .setProperty ("hibernate.connection.password", "root") .addAnnotatedClass (Employee.class) ; factory = cfg.buildSessionFactory (new StandardServiceRegistryBuilder (). ApplySettings (cfg.getProperties ()). Build ());} public static Session getSession () {if (factory! = null) {return factory.openSession () } else {factory = cfg.buildSessionFactory (new StandardServiceRegistryBuilder (). ApplySettings (cfg.getProperties ()). Build ());} return factory.openSession ();} public static void closeSession () {if (session! = null & & session.isOpen ()) {session.close ();}

Note: refer to the interface document of hibernate. Org.hibernate.cfg.Configuration class provides method setProperty for setting property property, parameter format (attribute name, attribute value), for example, setting database connection to setProperty ("hibernate.connection.url", "jdbc:mysql://localhost:3306/aleavesystem?characterEncoding=UTF-8"), and so on. You can add the attribute configuration.setProperty ("a", "1"). SetProperty ("b", "2") in noodle style.

AddAnnotatedClass, is the method provided for the entity class configuration, such as the above code addAnnotatedClass (Employee.class), configuration annotation entity class, it is also possible to add multiple entity classes addAnnotatedClass (class A) .addAnnotatedClass (class B) .addAnnotatedClass (class C). Note that the parameter is the class class, and add .class after the entity class directly.

Entity class Employee:

Import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.Table;@Entity@Table (name = "Employee") public class Employee {@ Id @ Column (name = "id") private int id; public Employee () {} public int getId () {return id;} public void setId (int id) {this.id = id;}}

Test entry class:

Import org.hibernate.*;public class Test {public static void main (String [] args) {/ * above is the configuration preparation, let's start our database operation * / Session session = HibernateUtils1.getSession (); / / get a session Transaction t = session.beginTransaction () from the session factory; Employee E1 = new Employee (); e1.setId (1) Employee e2 = new Employee (); e2.setId (2); session.persist (E1); session.persist (e2); t.commit (); session.close (); System.out.println ("successfully saved") }} the above is how to use the configuration class configuration database in hibernate shared by Xiaobian. If you happen to have similar doubts, please refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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