Hibernate 注解应用搭建

 1 package gdpi.annotation; 2 ?3 import java.io.Serializable; 4 import java.util.HashSet; 5 import java.util.Set; 6 ?7 import javax.persistence.CascadeType; 8 import javax.persistence.Column; 9 import javax.persistence.Entity;10 import javax.persistence.GeneratedValue;11 import javax.persistence.GenerationType;12 import javax.persistence.Id;13 import javax.persistence.OneToMany;14 import javax.persistence.Table;15 import javax.persistence.Transient;20 21 @Entity ???????????????????????　　　　　　　　　　　　　　　　 ?// @Entity注解 声明这个类为一个实体类22 @Table(name="t_grade") ???????　　　　　　　　　　　　　　　　　 // @Table 指明这个实体类对应数据库t_grade 表 23 public class Grade implements Serializable{24 25 ????@Transient ???????????????　　　　　　　　　　　　　　　　　 // 指明属性在数据库中不存在26 ????private static final long serialVersionUID = 1L;27 ????@Id ?????　　　　　　　　　　　　　　　　　　　　　　　　　　　　// 指定属性为唯一标识28 ????@GeneratedValue(strategy = GenerationType.IDENTITY) ????// 主键生成策略29 ????private Integer gid;30 ????31 ????@Column(name="gname") ???　　　　　　　　　　　　　　　　　　　// 将实体类的属性和数据库表的字段作一个映射32 ????private String gname;33 ????34 ????@Column(name="gdesc")35 ????private String gdesc;36 ????37 ????public Grade() {38 ????????super();39 ????????// TODO Auto-generated constructor stub40 ????}41 42 ????public Grade(Integer gid, String gname, String gdesc) {43 ????????super();44 ????????this.gid = gid;45 ????????this.gname = gname;46 ????????this.gdesc = gdesc;47 ????}48 49 ????50 ????public Integer getGid() {51 ????????return gid;52 ????}53 54 ????public void setGid(Integer gid) {55 ????????this.gid = gid;56 ????}57 58 ????public String getGname() {59 ????????return gname;60 ????}61 62 ????public void setGname(String gname) {63 ????????this.gname = gname;64 ????}65 66 ????public String getGdesc() {67 ????????return gdesc;68 ????}69 70 ????public void setGdesc(String gdesc) {71 ????????this.gdesc = gdesc;72 ????}73 74 ????@Override75 ????public String toString() {76 ????????return "Grade [gid=" + gid + ", gname=" + gname + ", gdesc=" + gdesc + "]";77 ????}78 }

 1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE hibernate-configuration PUBLIC 3 ????????"-//Hibernate/Hibernate Configuration DTD 3.0//EN" 4 ????????"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> 5 <hibernate-configuration> 6 ????<session-factory> 7 ????????<!--1、配置数据库连接信息 --> 8 ????????<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> 9 ????????<property name="hibernate.connection.url">jdbc:mysql:///hibernate_study</property>　　<--hibernate_study 为我的本地数据库-->10 ????????<property name="hibernate.connection.username">root</property>　　　　<-- root 为我的本地数据库用户名-->11 ????????<property name="hibernate.connection.password">root</property>　　　　<-- root 为我的本地数据库密码-->12 ????????13 ????????<!--2、配置hibernate的信息 -->14 ????????<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>15 ????????<property name="hibernate.format_sql">true</property>16 ????????<property name="hibernate.show_sql">true</property>17 ????????<property name="hibernate.hbm2ddl.auto">update</property>18 ????????19 ????????<-- 引入实体 class:为实体类的类路径-->20 ????????<mapping class="gdpi.annotation.Grade"/>21 ?22 ????????23 ????</session-factory>24 </hibernate-configuration>

 1 package gdpi.annotation; 2 ?3 import java.util.List; 4 ?5 import org.hibernate.Session; 6 import org.hibernate.SessionFactory; 7 import org.hibernate.cfg.Configuration; 8 import org.junit.Test; 9 10 import gdpi.annotation.Grade;11 12 /**13 ?* 测试类14 ?* */15 @SuppressWarnings("deprecation")16 public class Test {17 ????private static Configuration cfg = null;18 ????private static SessionFactory sf = null;19 ????private static Session session = null;20 ????21 ????static{22 ????????cfg = new Configuration();23 ????????cfg.configure();24 ????????sf = cfg.buildSessionFactory();25 ????????session = sf.openSession();26 ????}27 28 ????public static Session getSession() {29 ????????return session;30 ????}31 ????32 ????@Test33 ????public void test(){34 ????????// 获取Session 对象，类似于JDBC中的Connection对象35 ????????Session session = getSession();36 ????????List<Grade> list = session.createQuery("from Grade").list();　　// 使用hql查询语句，查询该表中的所有数据37 ????????if(list != null){38 ????????????for(Grade g:list){39 ????????????????System.out.println(g);40 ????????????}41 ????????}42 ????}43 }