Hibernate entity type to map file

1. Convert an entity type to a table in a database by writing hibernate mapping files

One of the mapping files is written according to the entity type.

Entity type User.java

Package Cn.wwh.www.hibernate.dd.property;import java.util.arrays;import java.util.date;/** * Class Function: * * * @author Skiff *@ Version 1.0 *@ created: 2014-8-17 pm 08:05:30 */public class User {private Integer id;private String name;//Name Private Boole an gender; True indicates male, false indicates female private Date birthday; Birthday Private String desc; A large paragraph description, up to 5000 words private byte[] photo; Photo/** * @return The ID */public Integer getId () {return ID;} /** * @param id The ID to set */public void SetId (Integer id) {this.id = ID;} /** * @return The name */public String getName () {return name;} /** * @param name the name to set */public void SetName (String name) {this.name = name;} /** * @return The Gender */public Boolean Isgender () {return gender;} /** * @param gender the gender to set */public void Setgender (Boolean gender) {This.gender = gender;} /** * @return The birthday */public Date getbirthday () {return birthday;} /** * @param birthday The birthday to set */public void Setbirthday (Date birthday) {this.birthday = Birthday;} /** * @return The desc */public String GetDesc () {return desc;} /** * @param desc the desc to set */public void Setdesc (String desc) {this.desc = desc;} /** * @return The photo */public byte[] Getphoto () {return photo;} /** * @param photo The photo to set */public void Setphoto (byte[] photo) {This.photo = photo;} @Overridepublic String toString () {return "User [birthday=" + birthday + "\ n desc=" + desc + "\ n gender=" + gender + "\ n ID = "+ id +" \ n name= "+ name +" \ n photo= "+ arrays.tostring (photo) +"] ";}}

2. mapping file User.hbm.xml:

<?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 ">
3. master configuration file:
Hibernate.cfg.xml
<?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 ">
                        Create-drop: Create a table at startup and delete the table before exiting.
<span style= "White-space:pre" ></span> Update: Created or updated if the table structure is inconsistent. Validate: Validates the table structure at startup if it does not throw an exception.       --><!--automatically create data tables--><property name= "Hbm2ddl.auto" >update</property><!--SQL statements that show data manipulation-- ><property name= "Show_sql" >true</property><!--formatted display SQL statement--><property name= "Format_sql" >true</property><!--3. Import the mapping profile--><mapping resource= "cn/wwh/www/hibernate/dd/property/ User.hbm.xml "/></session-factory>

4. Test the data in the database:

Package Cn.wwh.www.hibernate.dd.property;import Java.io.fileinputstream;import Java.util.date;import Org.hibernate.session;import Org.hibernate.sessionfactory;import Org.hibernate.cfg.configuration;import org.junit.test;/** * Function of class: * * * @author Skiff * @version 1.0 *@ created: 2014-8-17 pm 08:10:38 */public class Testsqlbyxml {Priv Ate static sessionfactory sessionfactory = new Configuration (). Configure (). Buildsessionfactory ();//Save @testpublic Void Testsave () throws Exception {Session session = Sessionfactory.opensession (); session.begintransaction ();//----------- ----------------------------//reads the picture from the hard disk and then stores the database FileInputStream in = new FileInputStream ("f:/psb.jpg"); byte[] Photo = New Byte[in.available ()];in.read (photo); In.close ();//Prepare the object User user = new user (); User.setname ("skiff"); User.setgender (true); User.setbirthday (new Date ()); User.setdesc ("Skiff is a positive child, striving for the dream ..."); User.setphoto (photo);// Save Session.save (user);//---------------------------------------session.gettransaction (). commit (); sEssion.close ();} Get @testpublic void Testget () throws Exception {Session session = Sessionfactory.opensession (); Session.begintransaction ();//---------------------------------------User user = (user) Session.get (user.class, 1); System.out.println (User.getname ()); System.out.println (User.isgender ()); System.out.println (User.getbirthday ()); System.out.println (User.getdesc ()); System.out.println (User.getphoto ());//system.out.println (user);//--------------------------------------- Session.gettransaction (). commit (); Session.close ();}}