环境:maven普通项目
项目结构
1 pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mycompany</groupId>
<artifactId>learHibernate</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.3.8.Final</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.8</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
2 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">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">huangdawei123</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="hibernate.show_sql">true</property>
<mapping class="com.mycompany.beans.User"/>
<mapping class="com.mycompany.beans.Role"/>
</session-factory>
</hibernate-configuration>
3 log4j.propertites
log4j.rootLogger = DEBUG , stdout , D
#log4j.logger.org.mybatis=DEBUG
### output to the console ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = %d{ABSOLUTE} %5p %c{ 1 }:%L - %m%n
log4j.appender.stdout.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [%c]-[%p] %m%n
4 实体对象建立
4.1 User
package com.mycompany.beans;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.Table;
@Entity
@Table(name="user")
public class User {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int userId;
@Column
private String userName;
@Column
private String userPwd;
@OneToMany(cascade=CascadeType.ALL, fetch = FetchType.LAZY, targetEntity=Role.class, orphanRemoval=true)
@JoinColumn(name="userId")
private Set<Role> roles;
public User(String string, String string2) {
this.userName = string;
this.userPwd = string2;
}
public User() {
}
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPwd() {
return userPwd;
}
public void setUserPwd(String userPwd) {
this.userPwd = userPwd;
}
public Set<Role> getRoles() {
return roles;
}
public void setRoles(Set<Role> roles) {
this.roles = roles;
}
}
4.2
package com.mycompany.beans;
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="role")
public class Role {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int roleId;
@Column
private String roleName;
public int getRoleId() {
return roleId;
}
public void setRoleId(int roleId) {
this.roleId = roleId;
}
public String getRoleName() {
return roleName;
}
public void setRoleName(String roleName) {
this.roleName = roleName;
}
}
5 测试代码:
package com.mycompany.test;
import java.util.HashSet;
import java.util.Set;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.junit.Test;
import com.mycompany.beans.Role;
import com.mycompany.beans.User;
public class Hibernate4Test {
// @Test 简单用户添加
public void test(){
SessionFactory sessionFactory = new Configuration()
.configure() // configures settings from hibernate.cfg.xml
.buildSessionFactory(null);
Session session = sessionFactory.openSession();
session.beginTransaction();
session.save(CreateUser("账号","密码"));
session.save(CreateUser("zhanghao","mima"));
session.getTransaction().commit();
session.close();
}
private User CreateUser(String string, String string2) {
return new User(string, string2);
}
//级联增加
//@Test
public void cascadeAdd(){
Role role = new Role();
role.setRoleName("程序员");
Role role2 = new Role();
role2.setRoleName("程序员");
Set<Role> roles = new HashSet<Role>();
roles.add(role);
roles.add(role2);
User user1 = this.CreateUser("吉林1", "密码1");
user1.setRoles(roles);
Session session = getSession();
session.beginTransaction();
session.save(user1);
session.getTransaction().commit();
session.close();
}
//级联查询
// @Test
public void cascadeQuery(){
Session session = getSession();
session.beginTransaction();
User user = (User) session.get(User.class, 1);
System.out.println(user.getUserName());
Set<Role> roles = user.getRoles();
for(Role r : roles){
System.out.print(r.getRoleName() + ", ");
}
session.getTransaction().commit();
session.close();
}
//级联修改
// @Test
public void cascadeUpdate(){
Session session = getSession();
session.beginTransaction();
User user = (User) session.get(User.class, 1);
System.out.println(user.getUserName());
Set<Role> roles = user.getRoles();
int i = 0;
for(Role r : roles){
i++;
// System.out.print(r.getRoleName() + ", ");
r.setRoleName(user.getUserName()+":"+r.getRoleName() + i);
}
session.getTransaction().commit();
session.close();
// cascadeQuery();
}
//级联删除
// @Test
public void cascadeDelete(){
Session session = getSession();
session.beginTransaction();
User user = (User) session.get(User.class, 2);
// System.out.println(user.getUserName());
// Set<Role> roles = user.getRoles();
// for(Role r : roles){
// System.out.print(r.getRoleName() + ", ");
// }
session.delete(user);
session.getTransaction().commit();
session.close();
// cascadeQuery();
}
private Session getSession() {
return new Configuration().configure().buildSessionFactory().openSession();
}
}