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

hibernate的优势：跨数据库的无缝移植

如何在项目中添加hibernate支持(手动添加)

1.添加hibernate相关依赖

<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.lww</groupId>

  <artifactId>T224_hibernate</artifactId>

  <packaging>war</packaging>

  <version>0.0.1-SNAPSHOT</version>

  <name>T224_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>T224_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>

2.在resource目录下添加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/t224?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/liuwenwu/one/entity/User.hbm.xml" />

    </session-factory>

</hibernate-configuration>

3.建立实体类User

package com.liuwenwu.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() {

        super();

    }

    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;

    }

    @Override

    public String toString() {

        return "User [id=" + id + ", userName=" + userName + ", userPwd=" + userPwd + ", sex=" + sex + ", birthday="

                + birthday + ", realName=" + realName + ", createDatetime=" + createDatetime + ", remark=" + remark

                + "]";

    }

}

4.实体类的配置文件 User.hbm.xml  映射实体类（User）

<?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名

        id标签：    配置的是表中的主键

            name:对应的是实体类属性名

            type:指的是实体类数据类型

            column：数据库表对应的列名

        property标签：配置除主键以为列段对应的类属性映射关系

            name:对应的是实体类属性名

            type:指的是实体类数据类型

            column：数据库表对应的列名

            insert="false" update="false" 表示该列段或者说该属性只做查询使用，不做更新(修改)

     -->

    <class name="com.liuwenwu.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>

接下来是CRUD的演示

查询：

package com.liuwenwu.demo;

import java.util.List;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

/**

 * hibernate查询演示

 * @author ASUS

 */

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 obj : list) {

            System.out.println(obj);

        }

        session.close();

    }

}

新增：

package com.liuwenwu.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.liuwenwu.one.entity.User;

/**

 * hibernate新增演示

 * @author ASUS

 *

 */

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, "aa", "版本", "男", new Date(System.currentTimeMillis()), "存储", new Timestamp(System.currentTimeMillis()), "信息"));

        transaction.commit();

        session.close();

    }

}

修改：

package com.liuwenwu.demo;

import java.sql.Date;

import java.sql.Timestamp;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;

import com.liuwenwu.one.entity.User;

/**

 * hibernate修改演示

 * @author ASUS

 *

 */

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, "aa", "版本", "男", new Date(System.currentTimeMillis()), "存储", new Timestamp(System.currentTimeMillis()), "信息"));

//        User u=new User(null, "aa", "版本", "男", new Date(System.currentTimeMillis()), "存储", new Timestamp(System.currentTimeMillis()), "信息");

//        u.setRealName("啥");

        User user = session.get(User.class, 2);

        user.setRealName("三毛");

        transaction.commit();

        session.close();

    }

}

删除：

package com.liuwenwu.demo;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;

import com.liuwenwu.one.entity.User;

/**

 * hibernate删除的演示

 * @author ASUS

 *

 */

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(2);

        session.delete(user);

        transaction.commit();

        session.close();

    }

}

Hibernate的管理对象的三种状态运行图解

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