hibernate入门

 

 

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
mybatis

在项目中添加hibernate支持

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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com</groupId>
	<artifactId>Hibernate2</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>Hibernate2 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>Hibernate2</finalName>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.7.0</version>
				<configuration>
					<source>${maven.compiler.source}</source>
					<target>${maven.compiler.target}</target>
					<encoding>${project.build.sourceEncoding}</encoding>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

　　在pom.xml 中查看导入的jar包是否下载完整或有没有冲突

之后出现

映射文件：user.hbm.xml

<?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.javaxl.one.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>

　　实体类：

package com.entity;

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

public class User {
	private int uid;
	private String userName;
	private String userPwd;
	private String realName;
	private String sex;
	private Date birthday;
	private Timestamp createDatetime;
	private String remark;

	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;
	}

	public int getUid() {
		return uid;
	}

	public void setUid(int uid) {
		this.uid = uid;
	}

	@Override
	public String toString() {
		return "User [uid=" + uid + ", 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(String userName2, String userPwd2, String realName2, int i, java.util.Date date,
			Timestamp createDatetime2, String remark2) {
		// TODO Auto-generated constructor stub
	}

	public User() {
		// TODO Auto-generated constructor stub
	}

}

　　

测试：QueryDemo.java:

package com.test;

import org.hibernate.cfg.Configuration;

import java.util.List;

import org.hibernate.SessionFactory;

public class QueryDemo {

	public static void main(String[] args) {
		//对hibernate.cfg.xml进行建模拿到sessionfactory工厂
		Configeation new configuration().configure("/hibernate.cfg.xml");
		sessionFactory sessionFactory=configure.buildSessionFactory();
		//通过工厂获取到session会话
		Session session=sessionFactory.openSession();
		//操作数据库
		List list=session.createQuery("from User").list;
		for (Object object : list) {
			System.out.println(list);
		}
		session.close;
	}
}

　

 

AddDemo.java:

package com.test;

import org.hibernate.cfg.Configuration;

import com.entity.User;

import java.sql.Timestamp;
import java.util.Date;
import java.util.List;

import javax.transaction.Transaction;

import org.hibernate.SessionFactory;
/**
 * 增加
 * 
 * @author xyls
 *
 */
public class AddDemo {

	public static void main(String[] args) {
		//对hibernate.cfg.xml进行建模拿到sessionfactory工厂
		Configeation new configuration().configure("/hibernate.cfg.xml");
		sessionFactory sessionFactory=configure.buildSessionFactory();
		//通过工厂获取到session会话
		Session session=sessionFactory.openSession();
		//获取事务对象
		Transaction transaction=session.beginTransaction();
		//操作数据库
		session.save(new User("bing", "123456", "bing", 17, new Date(System.currentTimeMillis()), new Timestamp(System.currentTimeMillis()), "暂无"));
		//提交事务
		transaction.commit();
		
		session.close;
	}
}

　

 

delDemo.java

package com.test;

import org.hibernate.cfg.Configuration;

import com.entity.User;

import java.sql.Timestamp;
import java.util.Date;
import java.util.List;

import javax.transaction.Transaction;

import org.hibernate.SessionFactory;
/**
 * 删除
 * 
 * @author xyls
 *
 */
public class delDemo {

	public static void main(String[] args) {
		//对hibernate.cfg.xml进行建模拿到sessionfactory工厂
		Configeation new configuration().configure("/hibernate.cfg.xml");
		sessionFactory sessionFactory=configure.buildSessionFactory();
		//通过工厂获取到session会话
		Session session=sessionFactory.openSession();
		//获取事务对象
		Transaction transaction=session.beginTransaction();
		//操作数据库
		User user=new User();
		user.setUid(15);
		session.delete(user);
		//提交事务
		transaction.commit();
		
		session.close;
	}
}

　　

 

edit.java

package com.test;

import org.hibernate.cfg.Configuration;

import com.entity.User;

import java.sql.Timestamp;
import java.util.Date;
import java.util.List;

import javax.transaction.Transaction;

import org.hibernate.SessionFactory;

/**
 * 修改
 * 
 * @author xyls
 *
 */
public class editDemo {

	public static void main(String[] args) {
		//对hibernate.cfg.xml进行建模拿到sessionfactory工厂
		Configeation new configuration().configure("/hibernate.cfg.xml");
		sessionFactory sessionFactory=configure.buildSessionFactory();
		//通过工厂获取到session会话
		Session session=sessionFactory.openSession();
		//获取事务对象
		Transaction transaction=session.beginTransaction();
		//操作数据库
		User	User=new User("bing", "123456", "bing", 17, new Date(System.currentTimeMillis()), new Timestamp(System.currentTimeMillis()), "暂无");
		User.setUid(15);
		
		session.update(User);
		//提交事务
		transaction.commit();
		
		session.close;
	}
}

　　

 

hibernate管理对象的三种状态：

3中状态在特定的情况下可以互相转换