Hibernate development steps
The Hibernate framework development step project imports the required jar packages:
Http://pan.baidu.com/s/1eRQ19C2
Write hibernate.cfg.xml files
DOCTYPE hibernate-configuration PUBLIC
"- / / Hibernate/Hibernate Configuration DTD3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
Jdbc:mysql://127.0.0.1:3306/test
Root
123456
Com.mysql.jdbc.Driver
Org.hibernate.dialect.MySQLDialect
True
True
Update
Write entity classes, create tables
Eg:
Package com.edu.bean
Public class User {
Private intid
Private String username
Private String password
Public intgetId () {
Return id
}
Public voidsetId (int id) {
This.id = id
}
Public String getUsername () {
Return username
}
Public voidsetUsername (String username) {
This.username= username
}
Public String getPassword () {
Return password
}
Public voidsetPassword (String password) {
This.password= password
}
Public User (Stringusername, String password) {
Super ()
This.username= username
This.password= password
}
Public User () {
/ / TODO Auto-generated constructor stub
}
}
Write a mapping file
Eg:
DOCTYPE hibernate-mapping PUBLIC "- / / Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
Put the mapping file into hibernate.cfg.xml
Write code:
Eg:
Package com.edu.test
Import org.hibernate.Session
Import org.hibernate.SessionFactory
Import org.hibernate.Transaction
Import org.hibernate.cfg.Configuration
Import org.junit.Test
Import com.edu.bean.User
Public class HibernateTest {
@ Test
Public voidtest () {
/ / read the hibernate.cfg.xml main configuration file
Configurationcfg=new Configuration () .configure (hibernate.cfg.xml)
/ / create a SessionFactory factory
SessionFactorysf=cfg.buildSessionFactory ()
/ / obtain session
Sessionsession=sf.openSession ()
/ / create a transaction
Transactiontc=session.beginTransaction ()
/ / create a User object
Useruser=new User (Zhang San, 123456)
/ / persist object
Try {
/ / Save data
Session.save (user)
/ / commit transaction (indispensable)
Tc.commit ()
} catch (Exception e) {
/ / data operation failed, rollback transaction
Tc.rollback ()
}
/ / close session
Session.close ()
}
}
Code layering optimization: get the HibernateGetSession class of Session:
Package com.edu.dbconn
Import org.hibernate.Session
Import org.hibernate.SessionFactory
Import org.hibernate.cfg.Configuration
Public class HibernateGetSession {
/ / make sure that the SessionFactory factory is created only once
Private staticSessionFactory sf
Static {
If (sf==null) {
/ / read the hibernate.cfg.xml main configuration file
Configurationcfg=new Configuration () .configure (hibernate.cfg.xml)
/ / create a SessionFactory factory
Sf=cfg.buildSessionFactory ()
}
}
Public staticSession getSession () {
/ / create a session
Sessionsession=sf.openSession ()
Return session
}
}
The UserDao class of the Dao layer:
Package com.edu.dao
Import org.hibernate.Session
Import org.hibernate.Transaction
Import com.edu.bean.User
Import com.edu.dbconn.HibernateGetSession
Public class UserDao {
Public voidsaveUser () {
/ / obtain session
Sessionsession=HibernateGetSession.getSession ()
/ / create a transaction
Transactiontc=session.beginTransaction ()
/ / create a User object
Useruser=new User ("Li Si", "123456")
/ / persist object
Try {
/ / Save data
Session.save (user)
/ / commit transaction (indispensable)
Tc.commit ()
} catch (Exception e) {
/ / data operation failed, rollback transaction
Tc.rollback ()
}
/ / close session
Session.close ()
}
}
Test layer:
Package com.edu.test
Import org.junit.Test
Import com.edu.dao.UserDao
Public class HibernateTest {
@ Test
Public voidtest () {
UserDaoud=new UserDao ()
Ud.saveUser ()
}
}
Instance source code:
Http://pan.baidu.com/s/1eRPLFJO
