Hibernate01

Hibernate简介：
在基于MVC设计模式的JAVA WEB应用中，Hibernate可以作为模型层/数据访问层。它通过配置文件(hibernate.properties或hibernate.cfg.xml)和映射文件(***.hbm.xml)把JAVA对象或PO(Persistent Object,持久化对象)映射到数据库中的数据库，然后通过操作PO，对数据表中的数据进行增，删，改，查等操作。

Hibernate的crud

在pom.xml导入Hibernate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.chenjiahao</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>${mysql.driver.version}</version>
		</dependency>
	</dependencies>
  <build>
    <finalName>hibernate</finalName>
    <plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.7.0</version>
				<configuration>
					<source>${maven.compiler.source}</source>
					<target>${maven.compiler.target}</target>
					<encoding>${project.build.sourceEncoding}</encoding>
				</configuration>
			</plugin>
		</plugins>
  </build>
</project>

在src/main/resources目录下创建：（主配置文件hibernate.cfg.xml）

<?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/T224?useUnicode=true&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/chenjiahao/one/entity/User.hbm.xml"/>
	</session-factory>
</hibernate-configuration>

　　子配置文件(和实体类在同一目录下)：（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标签：
          name:对应的是需要映射的实体类的全路径名
          table:实体类对应的数据库中的表
     id标签： 配置的是表中的主键
          name:对应的是实体类的属性名
          type:指的是实体类数据类型
          column:数据库表对应的列段
      property:配置出去主键以外列段对应的类属性映射关系
            name:对应的是实体类的属性名
            type:指的是实体类数据类型
            column:数据库表对应的列段
            insert="false" update="false"
                                   上面的表示的含义是：该列段或者说该属性只作查询用，不做更新
     -->
	<class name="com.chenjiahao.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>

　　User实体类：

package com.chenjiahao.one.entity;

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

public class User {

	   private Integer id;
	   private String userName;
	   private String userPwd;
	   private String sex;
	   private Date birthday;
	   private String realName;
	   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 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 String getRealName() {
		return realName;
	}
	public void setRealName(String realName) {
		this.realName = realName;
	}
	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 User(Integer id, String userName, String userPwd, String sex, Date birthday, String realName,
			Timestamp createDatetime, String remark) {
		super();
		this.id = id;
		this.userName = userName;
		this.userPwd = userPwd;
		this.sex = sex;
		this.birthday = birthday;
		this.realName = realName;
		this.createDatetime = createDatetime;
		this.remark = remark;
	}
	public User() {
		super();
		// TODO Auto-generated constructor stub
	}
	@Override
	public String toString() {
		return "User [id=" + id + ", userName=" + userName + ", userPwd=" + userPwd + ", sex=" + sex + ", birthday="
				+ birthday + ", realName=" + realName + ", createDatetime=" + createDatetime + ", remark=" + remark
				+ "]";
	}
	
	   
	   

}

　　

测试：

insetDemo类：

package com.chenjiahao.one.demo;

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

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

import com.chenjiahao.one.entity.User;

/**
 * hibernate新增演示
 * @author dell
 *
 */
public class InsertDemo {
 
	
	  public static void main(String[] args) {
		Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
		SessionFactory sessionFactory = configure.buildSessionFactory();
		//会话，而这里的会话指的是操作数据库的链接
		Session session = sessionFactory.openSession();
		Transaction transaction = session.beginTransaction();
	     session.save(new User(null, "123", "456", "男", new Date(System.currentTimeMillis()), "1234", new Timestamp(System.currentTimeMillis()), "777"));
	     transaction.commit();
		session.close();
	}
}

　　DeleteUser类：

package com.chenjiahao.one.demo;

import java.util.List;

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

import com.chenjiahao.one.entity.User;

/**
 * hibernate删除演示
 * @author dell
 *
 */
public class DeleteDemo {
	
 
	
	  public static void main(String[] args) {
		Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
		SessionFactory sessionFactory = configure.buildSessionFactory();
		//会话，而这里的会话指的是操作数据库的链接
		Session session = sessionFactory.openSession();
		Transaction transaction = session.beginTransaction();
		User user = new User();
		user.setId(1);
		session.delete(user);
		transaction.commit();
		session.close();
	}
}

　　UpdateUser类：

package com.chenjiahao.one.demo;

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

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

import com.chenjiahao.one.entity.User;

/**
 * hibernate修改演示
 * @author dell
 *
 */
public class UpdateDemo {
 
	
	  public static void main(String[] args) {
		Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
		SessionFactory sessionFactory = configure.buildSessionFactory();
		//会话，而这里的会话指的是操作数据库的链接
		Session session = sessionFactory.openSession();
		Transaction transaction = session.beginTransaction();
//	     session.save(new User(null, "123", "456", "男", new Date(System.currentTimeMillis()), "1234", new Timestamp(System.currentTimeMillis()), "777"));
		User user = session.get(User.class, 1);
		
		user.setRealName("000");
		System.out.println(user);
	     transaction.commit();
		session.close();
	}
}

　　InsertUser类：

package com.chenjiahao.one.demo;

import java.util.List;

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

/**
 * hibernate查询演示
 * @author dell
 *
 */
public class QueryDemo {
	
 
	
	  public static void main(String[] args) {
		Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
		SessionFactory sessionFactory = configure.buildSessionFactory();
		//会话，而这里的会话指的是操作数据库的链接
		Session session = sessionFactory.openSession();
		List list = session.createQuery("from User").list();
		for (Object object : list) {
			System.out.println(object);
		}
		session.close();
	}
}

　　Hibernate的三种状态：