2. Create com.huizhi.dao, com.huizhi.po, com.huizhi.utils, and com.huizhi.test packages under scr.
3. Create a new configuration file hibernate.cfg.xml under scr.
<?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- Configure Database Adapter --> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!-- Configure database jdbc driver--> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <!-- Configuration database connection string --> <property name="connection.url">jdbc:mysql://192.168.1.110:3306/hibernate</property> <!-- Configure database connection username--> <property name="connection.username">sa</property> <!-- Configure database connection user password--> <property name="connection.password">hainan</property> <!-- Whether to display the hibernate SQL statement --> <property name="show_sql">true</property> <property name="format_sql">true</property> <!-- When the entity class is exported to the database, if there is a table processing method: hibernate.hbm2ddl.auto :(create-drop, create, update, validate) --> <property name="hbm2ddl.auto">update</property> <!-- Configure entity class mapping --> <mapping class="com.huizhi.po.User" /> </session-factory> </hibernate-configuration>
4. Add the entity class under the po package, and the mapping configuration file User.hbm.xml.
package com.huizhi.po;
public class User {
private String USER_ID;
private String USER_NAME;
private String USER_PWD;
public String getUSER_ID() {
return USER_ID;
}
public void setUSER_ID(String uSER_ID) {
USER_ID = uSER_ID;
}
public String getUSER_NAME() {
return USER_NAME;
}
public void setUSER_NAME(String uSER_NAME) {
USER_NAME = uSER_NAME;
}
public String getUSER_PWD() {
return USER_PWD;
}
public void setUSER_PWD(String uSER_PWD) {
USER_PWD = uSER_PWD;
}
}
<?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.huizhi.po.User"> <class name="com.huizhi.po.User" table="USER_INFO"> <id name="USER_ID"> <column name="USER_ID" /> <!-- Configure the primary key generation strategy--> <generator class="uuid" /> </id> <property name="USER_NAME" column="USER_NAME" /> <property name="USER_PWD" column="USER_PWD" /> </class> </hibernate-mapping>
5. Create a new HibernateUtil.java file under the utils package.
package com.huizhi.utils;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
public class HibernateUtil {
/**
* @return get the session factory
*/
public static SessionFactory getSessionFactory()
{
//Read Hibernate's configuration file hibernamte.cfg.xml file
Configuration cfg=new Configuration().configure();
//Create a service registration builder object and load all configuration information through the configuration object
ServiceRegistryBuilder regbulider=new ServiceRegistryBuilder().applySettings(cfg.getProperties());
//create registration service
ServiceRegistry sr=regbulider.buildServiceRegistry();
//create session factory
SessionFactory sessionFactory=cfg.buildSessionFactory(sr);
return sessionFactory;
}
/**
* @return get the session object
*/
public static Session getSession()
{
return getSessionFactory().openSession();
}
}
6. Create a new BaseDao.java file under the dao package.
package com.huizhi.dao;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.huizhi.utils.HibernateUtil;
public class BaseDAO {
/**
* @param obj add data
* @return
*/
public static boolean add(Object obj)
{
Session session=null;
Transaction tran=null;
boolean result=false;
try
{
session=HibernateUtil.getSession();
tran=session.beginTransaction();
session.save(obj);
tran.commit();
result=true;
}
catch (Exception e)
{
if(tran!=null)
{
//thing rolls back
tran.rollback();
}
}
finally
{
if(session!=null)
{
//Close the session
session.close();
}
}
return result;
}
/**
* @return update data
* The parameter is the modified primary key id object
*/
public static boolean update(Object object)
{
Session session=null;
Transaction tran=null;
boolean result=false;
try
{
session=HibernateUtil.getSession();
tran=session.beginTransaction();
session.update(object);
tran.commit();
result=true;
}
catch (Exception e)
{
if(tran!=null)
{
//thing rolls back
tran.rollback();
}
}
finally
{
if(session!=null)
{
//Close the session
session.close();
}
}
return result;
}
/**
* @param c
* @param id Query a piece of data based on the id number of the primary key
* @return
*/
public static Object get(Class<?> c,int id)
{
Session session=null;
Object object=null;
try
{
session=HibernateUtil.getSession();
object=session.get(c,id);
}
catch (Exception e)
{
}
finally
{
if(session!=null)
{
//Close the session
session.close();
}
}
return object;
}
/**
* @param obj
* @return delete data
*/
public static boolean delete(Object obj)
{
Session session=null;
Transaction tran=null;
boolean result=false;
try
{
session=HibernateUtil.getSession();
tran=session.beginTransaction();
session.delete(obj);
tran.commit();
result=true;
}
catch (Exception e)
{
if(tran!=null)
{
//thing rolls back
tran.rollback();
}
}
finally
{
if(session!=null)
{
//Close the session
session.close();
}
}
return result;
}
/**
* @param <T> query multiple records
* @param sql sql statement
* @param param parameter array
* @return
*/
@SuppressWarnings("unchecked")
public static <T> List<T> query(String sql,String[] param)
{
List<T> list=new ArrayList<T>();
Session session=null;
try
{
session=HibernateUtil.getSession();
Query query=session.createQuery(sql);
if(param!=null)
{
for(int i=0;i<param.length;i++)
{
query.setString(i,param[i]);
}
}
list=query.list();
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
finally
{
if(session!=null)
{
session.close();
}
}
return list;
}
/**
* @param sql
* @param param query a single record
* @return
*/
public static Object queryOne(String sql,String[] param)
{
Object object=null;
Session session=null;
try
{
session=HibernateUtil.getSession();
Query query=session.createQuery(sql);
if(param!=null)
{
for(int i=0;i<param.length;i++)
{
query.setString(0,param[i]);
}
object=query.uniqueResult();
}
}
catch (Exception e)
{
}
finally
{
if(session!=null)
{
session.close();
}
}
return object;
}
/**
* @param <T>
* @param sql
* @param param
* @param page
* @param you
* @return implement paging query
*/
@SuppressWarnings("unchecked")
public static <T> List<T> queryByPage(String sql,String[] param,int page,int size)
{
List<T> list=new ArrayList<T>();
Session session=null;
try
{
session=HibernateUtil.getSession();
Query query=session.createQuery(sql);
if(param!=null)
{
for(int i=0;i<param.length;i++)
{
query.setString(i,param[i]);
}
}
// filter the number of bars
query.setFirstResult((page-1)*size);
query.setMaxResults(size);
list=query.list();
}
catch (Exception e)
{
}
finally
{
if(session!=null)
{
session.close();
}
}
return list;
}
/**
* @param hql
* @param for
* @return returns the number of data
*/
public static int getCount(String hql, String[] pras) {
int resu = 0;
Session s = null;
try {
s = HibernateUtil.getSession();
Query q = s.createQuery(hql);
if (pras != null) {
for (int i = 0; i < pras.length; i++) {
q.setString(i, pras[i]);
}
}
resu = Integer.valueOf(q.iterate().next().toString());
} catch (Exception e) {
e.printStackTrace ();
} finally {
if (s != null)
s.close();
}
return resu;
}
}
7. Create a new test.java test file under the test package for testing.
package com.huizhi.test;
import java.util.List;
import com.huizhi.dao.BaseDAO;
import com.huizhi.po.User;
public class test {
public static void main(String[] args) {
//Add user
User user = new User();
user.setUSER_NAME("Sun Wukong");
user.setUSER_PWD("admin");
BaseDAO.add(user);
//Paging query
List<User>list = BaseDAO.queryByPage("FROM User WHERE USER_PWD=?", new String[]{"admin"}, 1, 2);
for (User user2 : list) {
System.out.println("Username:"+user2.getUSER_NAME() +";Password:"+user2.getUSER_PWD());
}
}
}
———————————————————————————————————
The way of annotation: the
entity class is modified to
package com.huizhi.po;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="USER_INFO")
public class User {
private int USER_ID;
private String USER_NAME;
private String USER_PWD;
@Id
@Column(name = "USER_ID",nullable=false)
@GeneratedValue(strategy = GenerationType.IDENTITY)
public int getUSER_ID() {
return USER_ID;
}
public void setUSER_ID(int uSER_ID) {
USER_ID = uSER_ID;
}
@Column(name = "USER_NAME", nullable=false, length = 100)
public String getUSER_NAME() {
return USER_NAME;
}
public void setUSER_NAME(String uSER_NAME) {
USER_NAME = uSER_NAME;
}
@Column(name = "USER_PWD",nullable=false , length = 32)
public String getUSER_PWD() {
return USER_PWD;
}
public void setUSER_PWD(String uSER_PWD) {
USER_PWD = uSER_PWD;
}
}