Hibernate入门

最新推荐文章于 2025-07-28 23:27:29 发布

原创最新推荐文章于 2025-07-28 23:27:29 发布 · 80 阅读

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#hibernate

Hibernate简介

什么是hibernate
ORM框架/持久层框架 jdbc的一个框架
object reference mapping
通过管理对象来改变数据库中的数据
通过管理对象来操作数据库

优势：跨数据库的无缝移植

实现增删改查功能：
导入pom.xml依赖：

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.xhh</groupId>
  <artifactId>hibernate</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>hibernate Maven Webapp</name>
  <url>http://maven.apache.org</url>
  
  <properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
		<junit.version>4.12</junit.version>
		<servlet.version>4.0.0</servlet.version>
		<hibernate.version>5.3.0.Final</hibernate.version>
		<mysql.driver.version>5.1.46</mysql.driver.version>
	</properties>
  
  <dependencies>
    <dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>${junit.version}</version>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>${servlet.version}</version>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-core</artifactId>
			<version>${hibernate.version}</version>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>${mysql.driver.version}</version>
		</dependency>
  </dependencies>
  <build>
    <finalName>hibernate</finalName>
    <plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.7.0</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
					<encoding>UTF-8</encoding>
				</configuration>
			</plugin>
		</plugins>
  </build>
</project>

添加hibernate.cfg.xml(核心配置文件)：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
	"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
	"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
	<session-factory>
		<!-- 1. 数据库相关 -->
		<property name="connection.username">root</property>
		<property name="connection.password">123</property>
		<property name="connection.url">jdbc:mysql://localhost:3306/aini?useUnicode=true&amp;characterEncoding=UTF-8
		</property>
		<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

		<!-- 配置本地事务（No CurrentSessionContext configured!） -->
		<property name="hibernate.current_session_context_class">thread</property>

		<!-- 2. 调试相关 -->
		<property name="show_sql">true</property>
		<property name="format_sql">true</property>

		<!-- 3. 添加实体映射文件 -->
		<mapping resource="com/xhh/entity/User.hbm.xml"/>
	</session-factory>
</hibernate-configuration>

User.java实体类：

package com.xhh.entity;

import java.sql.Date;
import java.sql.Timestamp;

public class User {
    private Integer id;
    private String userName;
    private String userPwd;
    private String realName;
    private String sex;
    private Date birthday;
    private Timestamp createDatetime;
    private String remark;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	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 String getRealName() {
		return realName;
	}
	public void setRealName(String realName) {
		this.realName = realName;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
	public Timestamp getCreateDatetime() {
		return createDatetime;
	}
	public void setCreateDatetime(Timestamp createDatetime) {
		this.createDatetime = createDatetime;
	}
	public String getRemark() {
		return remark;
	}
	public void setRemark(String remark) {
		this.remark = remark;
	}
	@Override
	public String toString() {
		return "User [id=" + id + ", userName=" + userName + ", userPwd=" + userPwd + ", realName=" + realName
				+ ", sex=" + sex + ", birthday=" + birthday + ", createDatetime=" + createDatetime + ", remark="
				+ remark + "]";
	}
	public User(String userName, String userPwd, String realName, String sex, Date birthday, Timestamp createDatetime,
			String remark) {
		super();
		this.userName = userName;
		this.userPwd = userPwd;
		this.realName = realName;
		this.sex = sex;
		this.birthday = birthday;
		this.createDatetime = createDatetime;
		this.remark = remark;
	}
	public User() {
		super();
	}	    
}

实体类名对应的User.hbm.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
	<class name="com.xhh.entity.User" table="t_hibernate_user">
		<id name="id" type="java.lang.Integer" column="id">
			<generator class="increment" />
		</id>
		<property name="userName" type="java.lang.String" column="user_name">
		</property>
		<property name="userPwd" type="java.lang.String" column="user_pwd">
		</property>
		<property name="realName" type="java.lang.String" column="real_name">
		</property>
		<property name="sex" type="java.lang.String" column="sex">
		</property>
		<property name="birthday" type="java.sql.Date" column="birthday">
		</property>
		<property insert="false" update="false" name="createDatetime"
			type="java.sql.Timestamp" column="create_datetime">
		</property>
		<property name="remark" type="java.lang.String" column="remark">
		</property>
	</class>
</hibernate-mapping>

测试：
QueryDemo.java查询：

package com.xhh.test;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

/**
 * 查询
 * @author PC
 *
 */
public class QueryDemo {
public static void main(String[] args) {
	 Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
	 SessionFactory sessionFactory = configure.buildSessionFactory();
	 Session session = sessionFactory.openSession();
	 List list = session.createQuery("from User").list();
	 
	 
	for (Object obj : list) {
		System.out.println(obj);
	}
	
	session.close();
}
}

运行：
在这里插入图片描述
AddDemo.java增加：

package com.xhh.test;

import java.sql.Timestamp;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

import com.xhh.entity.User;

/**
 * 演示hibernate新增
 * @author PC
 *
 */
public class AddDemo {
public static void main(String[] args) {
	 Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
	 SessionFactory sessionFactory = configure.buildSessionFactory();
	 Session session = sessionFactory.openSession();
	 Transaction transaction = session.beginTransaction();
	 
	 User user=new User("linyaodong", "123", "林耀东", "男", new java.sql.Date(System.currentTimeMillis()), new Timestamp(System.currentTimeMillis()), "fuck");
	 session.save(user);
	 transaction.commit();
	 session.close();
}
}

运行：
在这里插入图片描述
数据库：

editDemo.java修改：
两种方式：

package com.xhh.test;


import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

import com.xhh.entity.User;

/**
 * 演示hibernate新增
 * @author PC
 *
 */
public class editDemo {
public static void main(String[] args) {
	 Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
	 SessionFactory sessionFactory = configure.buildSessionFactory();
	 Session session = sessionFactory.openSession();
	 Transaction transaction = session.beginTransaction();
//   第一种： 
//	 User user=new User("lifei", "12345", "李飞", "男", new java.sql.Date(System.currentTimeMillis()), new Timestamp(System.currentTimeMillis()), "fuck you");
//	 user.setId(15);
//	 session.update(user);
//	 session.save(user);

//   第二种
	 User user=session.get(User.class, 15);
	 user.setRealName("林耀东");
	 System.out.println(user);
	 
	 transaction.commit();
	 session.close();
}
}

运行：
在这里插入图片描述
数据库：

DelDemo.java删除：

package com.xhh.test;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

import com.xhh.entity.User;

/**
 * 演示hibernate删除
 * @author PC
 *
 */
public class DelDemo {
public static void main(String[] args) {
	 Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
	 SessionFactory sessionFactory = configure.buildSessionFactory();
	 Session session = sessionFactory.openSession();
	 Transaction transaction = session.beginTransaction();
	 
	 User user =new User();;
	 user.setId(15);
	 session.delete(user);
	 
	 transaction.commit();
	 session.close();
}
}

运行：
在这里插入图片描述
数据库：