Java-hibernate's Hello World

Hibernate is the ORM framework for a lightweight encapsulation of JDBC, which acts as a persistence layer for the project.

To use hibernate, you need to continue configuring it first,

Primer pack: Download hibernate and add the jar package

Simultaneously introducing the MySQL jar package

<1> First, manually create a test table, where the database chooses MySQL

CREATE TABLE ' employee ' (' id ' int ') NOT null auto_increment, ' name ' varchar (a) not null, ' email ' varchar (#) NOT NULL, ' Hi Redate ' date not null,primary KEY (' id ')) engine=innodb auto_increment=12 DEFAULT charset=latin1;

Then go to manual data entry

<2> Create our domain object

Build a package named Com.sun.domain, under the package build a Java file named: Employee.java

It contains all the fields in the table.

Package Com.sun.domain;public class Employee {private static final long Serialversionuid = 1l;private Integer id;private S Tring name;private String email;private java.util.Date hiredate;public Integer getId () {return ID;} public void SetId (Integer id) {this.id = ID;} Public String GetName () {return name;} public void SetName (String name) {this.name = name;} Public String Getemail () {return email;} public void Setemail (String email) {this.email = email;} Public Java.util.Date Gethiredate () {return hiredate;} public void Sethiredate (Java.util.Date hiredate) {this.hiredate = HireDate;}}

　　<3> Create a mapping relationship for objects and tables under Com.sun.domain Employee.hbm.xml

<property></property> tag under name is the property name of the domain object,<column/> is the field name of the table corresponding to the property name

<?xml version= "1.0" encoding= "UTF-8"? ><! DOCTYPE hibernate-mapping Public "-//hibernate/hibernate mapping DTD 3.0//en" "http://hibernate.sourceforge.net/ Hibernate-mapping-3.0.dtd ">
　　<4> Manually configure our Hibernate.cfg.xml file, which is used to configure the type of database connected, driver, Object-relational mapping file
<?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 ">                < connection to the!--database--><property name= "Connection.driver_class" >com.mysql.jdbc.Driver</property>< Property Name= "Connection.url" >jdbc:mysql://127.0.0.1:3306/test</property>
                <!--database username and password--
                
                <property name= "Connection.password" >123456</property>
<property name= "Show_sql" >true</property><property name= "dialect" > Org.hibernate.dialect.mysqlinnodbdialect</property><mapping resource= "Com/sun/domain/Employee.hbm.xml" /></session-factory>
　　<5> Write a manual test file, because hibernate is a database persistence framework, so it's not possible to use the web, SE can also be used, which is tested with SE
Create a package com.sun.seriver, create a file below  Student.java
Package Com.sun.seriver;import Java.util.date;import Org.hibernate.session;import org.hibernate.SessionFactory; Import Org.hibernate.transaction;import Org.hibernate.cfg.configuration;import Com.sun.domain.employee;public  Class Student {public static void main (string[] args) {//TODO auto-generated method Stubstudent.delempoyee (); Delete//student.upempoyee ();//update//student.selectempoyee ();//Query//student.addempoyee ();//Add}private static void Delempoyee () {Configuration cfg=new configuration (); Sessionfactory SF = cfg.configure ("Hibernate.cfg.xml"). Buildsessionfactory (); Session session = Sf.opensession (); Transaction ts=session.begintransaction (); Employee emp= (Employee) session.load (Employee.class, 2); Session.delete (EMP); Ts.commit ();} private static void Upempoyee () {Configuration cfg=new configuration (); Sessionfactory SF = cfg.configure ("Hibernate.cfg.xml"). Buildsessionfactory (); Session session = Sf.opensession (); Transaction ts= session.begintransaction (); Employee emp= (Employee) session.load (EmPloyee.class, 1); Emp.setname ("Usagi"); Ts.commit ();} SQL SELECT private static void Selectempoyee () {Configuration cfg=new configuration (); Sessionfactory SF = cfg.configure ("Hibernate.cfg.xml"). Buildsessionfactory (); Session session = Sf.opensession (); Employee emp= (Employee) session.load (Employee.class, 2); System.out.println (Emp.getid () + "" +emp.getname () + "" +emp.getemail ()); Session.close (); INSERT SELECT private static void Addempoyee () {Employee s = new Employee (); S.setname ("Sunzhiyan"); S.setemail ("[email& Nbsp;protected] "); S.sethiredate (new Date ()); SYSTEM.OUT.PRINTLN ("Test is OK"); Configuration cfg=new configuration (); Sessionfactory SF = cfg.configure ("Hibernate.cfg.xml"). Buildsessionfactory (); Session session = Sf.opensession (); Session.begintransaction (); Session.save (s); Session.gettransaction (). commit (); Session.close (); Sf.close ();}}
In this way, basic hibernate basic configuration and testing is done
Java-hibernate's Hello World