hibernate还有人用吗

待我称王封你为后i 2022-09-06 04:50 180阅读 0赞

## 一、前情提要 ##

![20210819224533732.png][]

上午开会，来了一个噩耗，马上要启动一个旧项目重整项目，旧项目是用ssh + jsp写的，开了一上午的会，尤其项目过于复杂，式样十分不清晰，业务逻辑懂得人基本没有，因为是收购公司的一个老旧项目，目前项目参与者全部离职，经过一上午的讨论分析总结，老大决定先使用上午阅读源码，下午开会讨论，先整理出概要设计、系统设计、数据库定义书、API文档设计书的形式，熟悉代码，熟悉业务，最后采用springboot+vue的方式，重整项目。

哎，无奈啊，命不好啊，项目组分到这样一个烫手的山芋，下午就有一个老哥提了离职。。。

我还是重新看一遍hibernate吧，多年没有使用了，都忘得差不多了，先整理一篇简单的快速入门吧。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1b3J1aV9qYXZh_size_16_color_FFFFFF_t_70][]

**目录**

一、前情提要

二、hibernate与mybatis使用心得

三、DruidDataSource + JdbcTemplate方式实现增删改查

1、DruidDataSource 工具类

2、JdbcTemplate实现增删改查

四、hibernate项目搭建

1、引入jar包

2、配置XML文件

3、类文件

4、控制台输出

五、configuration

1、配置管理类：主要管理配置文件的一个类

2、方法

六、HQL查询

1、HQL

2、SQL

3、本地SQL查询

七、beginTransaction方法

1、数据库配置

2、其它参数配置

3、加载映射文件

八、hibernate执行流程图

--------------------

## 二、hibernate与mybatis使用心得 ##

springboot时代之前，持久层最流行的就是hibernate和mybatis了，hibernate对数据库进行了重量级的封装，hibernate的思想和Java不谋而合，都是对象的思想。听起来很友好，但配合使用的hql就不那么友好了，hql可以说是sql的简化版本，hql是在sql上面套了一层，但是hql优化很难搞，hibernate使用了大量的反射机制，虽然hibernate的反射大多数都是在程序初始化的时候完成的，但运行的过程中反射也是存在的，反射比较影响程序性能。

mybatis是持久层的轻量级框架，定义一个接口mapper，一个xml，映射关系一匹配，再配置一个扫描包，目前也是持久层的主流写法。

还有第三种方式DruidDataSource + JdbcTemplate，实现了在Java中直接书写sql语句，同时还能进行简单的对象操作。结合了hibernate和mybatis的部分优点，完美的产物？不存在的，到处都是sql，为以后的代码重构，框架重整，带来了不必要的麻烦，而且总感觉DruidDataSource + JdbcTemplate有一种lowlow的感觉。

## 三、DruidDataSource + JdbcTemplate方式实现增删改查 ##

### 1、DruidDataSource 工具类  ###

package com.guor.utils;
     
    import java.sql.Connection;
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.sql.Statement;
     
    import javax.sql.DataSource;
     
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
     
    import com.alibaba.druid.pool.DruidDataSource;
     
    public class JDBCUtils {
        private final static Logger log = LoggerFactory.getLogger(JDBCUtils.class);
     
        /**
         * 定义数据源
         */
        private static DataSource ds;
     
        /**
         * 定义数据库连接配置
         */
     
        static {
            try {
                /**
                 * 加载配置文件
                 */
                DruidDataSource dataSource = new DruidDataSource();
                dataSource.setDriverClassName("org.postgresql.Driver");
                dataSource.setUrl("jdbc:postgresql://127.0.0.1:5432/test");
                dataSource.setUsername("postgres");
                dataSource.setPassword("123456");
                ds = dataSource;
            } catch (Exception e) {
                log.error("create connection pool error,errorMessage:{}", e);
            }
        }
     
        /**
         * 获取数据源
         * @return 返回数据源
         */
        public static DataSource getDataSource(){
            return ds;
        }
     
        /**
         * 获取连接对象
         * @return 返回连接对象
         * @throws SQLException  抛出的编译异常
         */
        public static Connection getConn() throws SQLException {
            return ds.getConnection();
        }
     
        /**
         *  关闭连接
         * @param stmt  sql执行对象
         * @param conn  数据库连接对象
         */
        public static void close(Statement stmt, Connection conn){
            if(stmt != null){
                try {
                    stmt.close();
                } catch (SQLException e) {
                    log.error("close error,errorMessage:{}", e);
                }
            }
     
            if(conn != null){
                try {
                    conn.close();
                } catch (SQLException e) {
                    log.error("close error,errorMessage:{}", e);
                }
            }
        }
     
        /**
         * 关闭资源的重载方法
         * @param rs    处理结果集的对象
         * @param stmt  执行sql语句的对象
         * @param conn  连接数据库的对象
         */
        public static void close(ResultSet rs, Statement stmt, Connection conn){
            if(rs != null){
                try {
                    rs.close();
                } catch (SQLException e) {
                    log.error("close error,errorMessage:{}", e);
                }
            }
     
            if(stmt != null){
                try {
                    stmt.close();
                } catch (SQLException e) {
                    log.error("close error,errorMessage:{}", e);
                }
            }
     
            if(conn != null){
                try {
                    conn.close();
                } catch (SQLException e) {
                    log.error("close error,errorMessage:{}", e);
                }
            }
        }
    }

###  2、JdbcTemplate实现增删改查 ###

public class Test {
    	public static void main(String[] args) throws Exception {
    		insertTest();
    		updateTest();
    		deleteTest();
    	}
    	
    	// JDBCTemplate插入
    	public static void insertTest() throws Exception {
    		JdbcTemplate jdbcTemplate = new JdbcTemplate(DataSourceUtils.getDataSource());
    		String sql = "INSERT INTO user(id,name,age) VALUES (?, ?, ?)";
    		jdbcTemplate.update(sql, 1, "哪吒", 18);
    	}
    	
    	// JDBCTemplate更新
    	public static void updateTest() throws Exception {
    		JdbcTemplate jdbcTemplate = new JdbcTemplate(DataSourceUtils.getDataSource());
    		String sql = "UPDATE user SET age= ?, address = ? WHERE name=?";
    		int i = jdbcTemplate.update(sql, 19, "大连市", "哪吒");
    		System.out.println("影响的行数: " + i);
    	}
     
    	// JDBCTemplate删除
    	public static void deleteTest() throws Exception {
    		JdbcTemplate jdbcTemplate = new JdbcTemplate(DataSourceUtils.getDataSource());
    		String sql = "DELETE FROM user WHERE id=?";
    		int i = jdbcTemplate.update(sql, 1);
    		System.out.println("影响的行数: " + i);
    	}
    }

## 四、hibernate项目搭建 ##

学习一个框架无非就是三步：

*  引入jar包
 *  配置XML文件
 *  熟悉API

### 1、引入jar包 ###

我们使用的是Hibernate5.4的版本

**hibernate5.jar核心 + required 必须引入的(6个) + jpa 目录 + 数据库驱动包**

**![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1b3J1aV9qYXZh_size_16_color_FFFFFF_t_70 1][]**

### 2、配置XML文件 ###

（1）编写一个Entity对象->Employee.java

编写对象映射->Employee.hbm.xml。一般它和JavaBean对象放在同一目录下

![2021081922030244.jpg][]

在上面的模板上修改～下面会具体讲解这个配置文件!

<?xml version="1.0"?>
    <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
    
    <hibernate-mapping>
        <class name="com.ssh.entities.Employee" table="SSH_EMPLOYEE">
            <id name="id" type="java.lang.Integer">
                <column name="ID" />
                <generator class="native" />
            </id>
            <property name="lastName" type="java.lang.String">
                <column name="LASTNAME" />
            </property>
            <property name="email" type="java.lang.String">
                <column name="EMAIL" />
            </property>
            <property name="birth" type="java.util.Date">
                <column name="BIRTH" />
            </property>
            <property name="createTime" type="java.util.Date">
                <column name="CREATE_TIME" />
            </property>
            <many-to-one name="department" class="com.ssh.entities.Department">
                <column name="DEPARTMENT_ID" />
            </many-to-one>
        </class>
    </hibernate-mapping>

（2）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>
        	<property name="hibernate.dialect">org.hibernate.dialect.OracleDialect</property>
    		<property name="hibernate.connection.driverClass">oracle.jdbc.driver.OracleDriver</property>
    		<property name="hibernate.connection.username">mine</property>
    		<property name="hibernate.connection.password">mine</property>
    		<property name="hibernate.connection.jdbcUrl">jdbc:oracle:thin:@127.0.0.1:1521:orcl</property>
    		<property name="hibernate.show_sql">true</property>
    		<property name="hibernate.hbm2ddl.auto">update</property>
    		
    		<mapping resource="com/ssh/entities/Department.hbm.xml"/>
    		<mapping resource="com/ssh/entities/Employee.hbm.xml"/>
        </session-factory>
    </hibernate-configuration>

（3）applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xmlns:aop="http://www.springframework.org/schema/aop"
    	xmlns:context="http://www.springframework.org/schema/context"
    	xmlns:tx="http://www.springframework.org/schema/tx"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
    		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
    		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
    	
    	<context:property-placeholder location="classpath:db.properties" ignore-unresolvable="true"/>
    	
    	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    		<property name="user" value="${jdbc.username}"></property>
    		<property name="password" value="${jdbc.password}"></property>
    		<property name="driverClass" value="${jdbc.driverClass}"></property>
    		<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
    		
    		<property name="initialPoolSize" value="${jdbc.initialPoolSize}"></property>
    		<property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
    	</bean>
    	
    	
        <bean id="sessionFactory"
            class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
            
            <property name="dataSource" ref="dataSource"/>
            
            <property name="mappingResources">
                <list>
                    
                    <value>com/ssh/entities/Department.hbm.xml</value>
                    <value>com/ssh/entities/Employee.hbm.xml</value>
                    <value>hibernate.cfg.xml</value>
                </list>
            </property>
            
            <property name="hibernateProperties">
                <props>
                    
                    <prop key="hibernate.dialect">
                        org.hibernate.dialect.OracleDialect</prop>
                    
                    <prop key="hibernate.hbm2ddl.auto">update</prop>
                    
                    <prop key="hibernate.show_sql">true</prop>
                    
                    <prop key="hibernate.format_sql">true</prop>
                </props>
            </property>
        </bean>
        
    	 <bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">   
            <property name="sessionFactory" ref="sessionFactory"></property>   
        </bean>  
           
        <tx:annotation-driven transaction-manager="transactionManager"/>  
    	
    		
    	
    	
    </beans>

（4）applicationContext-beans.xml

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
     
    	<bean id="employeeDao" class="com.ssh.dao.EmployeeDao">
    		<property name="sessionFactory" ref="sessionFactory"></property>
    	</bean>
    	<bean id="departmentDao" class="com.ssh.dao.DepartmentDao">
    		<property name="sessionFactory" ref="sessionFactory"></property>
    	</bean>
    	
    	
    	<bean id="employeeService" class="com.ssh.service.EmployeeService">
    		<property name="employeeDao" ref="employeeDao"></property>
    	</bean>
    	<bean id="departmentService" class="com.ssh.service.DepartmentService">
    		<property name="departmentDao" ref="departmentDao"></property>
    	</bean>
    	
    	<bean id="employeeAction" class="com.ssh.actions.EmployeeAction" scope="prototype">
    		<property name="employeeService" ref="employeeService"></property>
    		<property name="departmentService" ref="departmentService"></property>
    	</bean>
    </beans>

（5）struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE struts PUBLIC
    	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    	"http://struts.apache.org/dtds/struts-2.3.dtd">
     
    <struts>
     
        <constant name="struts.enable.DynamicMethodInvocation" value="false" />
        <constant name="struts.devMode" value="true" />
     
        <package name="default" namespace="/" extends="struts-default">
        	
    		<interceptors>
    			<interceptor-stack name="sshStack">
    				<interceptor-ref name="paramsPrepareParamsStack">
    					<param name="prepare.alwaysInvokePrepare">false</param>
    				</interceptor-ref>
    			</interceptor-stack>
    		</interceptors>
    		
    		<default-interceptor-ref name="sshStack"></default-interceptor-ref> 
    		
    		<action name="emp-*" class="employeeAction" method="{1}">
            	<result name="list">/WEB-INF/views/emp-list.jsp</result>
            	<result type="stream" name="delete">
            		<param name="contentType">text/html</param>
            		<param name="inputName">inputStream</param>
            	</result> 
            	<result name="input">/WEB-INF/views/emp-input.jsp</result> 
                <result name="success" type="redirect">/emp-list</result> 
            </action>
        </package>
    </struts>

### 3、类文件 ###

（1）EmployeeAction

package com.ssh.actions;
     
    import java.io.ByteArrayInputStream;
    import java.io.InputStream;
    import java.io.UnsupportedEncodingException;
    import java.util.Date;
    import java.util.Map;
    import org.apache.struts2.interceptor.RequestAware;
    import com.opensymphony.xwork2.ActionSupport;
    import com.opensymphony.xwork2.ModelDriven;
    import com.opensymphony.xwork2.Preparable;
    import com.ssh.entities.Employee;
    import com.ssh.service.DepartmentService;
    import com.ssh.service.EmployeeService;
     
    public class EmployeeAction extends ActionSupport implements RequestAware,
    ModelDriven<Employee>,Preparable{
    	private static final long serialVersionUID = 1L;
    	
    	private EmployeeService employeeService;
    	public void setEmployeeService(EmployeeService employeeService) {
    		this.employeeService = employeeService;
    	}
    	             
    	private DepartmentService departmentService;
    	public void setDepartmentService(DepartmentService departmentService) {
    		this.departmentService = departmentService;
    	}
    	
    	public String list() {
    		request.put("employees",employeeService.getAll());
    		return "list";
    	}
    	
    	private Integer id;
    	public void setId(Integer id) {
    		this.id = id;
    	}
    	
    	public InputStream inputStream;
    	public InputStream getInputStream() {
    		return inputStream;
    	}
    	
    	public String delete() {
    		try {
    			employeeService.delete(id);
    			inputStream = new ByteArrayInputStream("1".getBytes("UTF-8"));
    		} catch (UnsupportedEncodingException e) {
    			e.printStackTrace();
    		}
    		return SUCCESS;
    	}
    	
    	public String input() {
    		request.put("departments", departmentService.getAll());
    		return INPUT;
    	}
    	
    	public void prepareInput() {
    		if(id!=null) {
    			model = employeeService.get(id);
    		}
    	}
    	
    	public String save() {
    		if(id == null) {
    			model.setCreateTime(new Date());
    		}
    		employeeService.saveOrUpdate(model);
    		System.out.println("model");
    		return SUCCESS;
    	}
    	 
    	public void prepareSave() {
    		if(id == null) {
    			model = new Employee();
    		}else {
    			model = employeeService.get(id);
    		}
    	}
    	
    	private Map<String,Object> request;
    	@Override
    	public void setRequest(Map<String, Object> arg0) {
    		this.request = arg0;
    	}
     
    	@Override
    	public void prepare() throws Exception {}
     
    	private Employee model;
    	
    	@Override
    	public Employee getModel() {
    		return model;
    	}
    }

（2）EmployeeService

package com.ssh.service;
     
    import java.util.List;
     
    import com.ssh.dao.EmployeeDao;
    import com.ssh.entities.Employee;
     
    public class EmployeeService {
    	private EmployeeDao employeeDao;
    	public void setEmployeeDao(EmployeeDao employeeDao) {
    		this.employeeDao = employeeDao;
    	}
    	
    	public void saveOrUpdate(Employee employee) {
    		employeeDao.saveOrUpdate(employee);
    	}
    	
    	public void delete(Integer id) {
    		employeeDao.delete(id);
    	}
    	
    	public List<Employee> getAll(){
    		List<Employee> employees = employeeDao.getAll();
    		return employees;
    	}
     
    	public Employee get(Integer id) {
    		return employeeDao.get(id);
    	}
     
    }

（3）EmployeeDao

package com.ssh.dao;
     
    import java.util.List;
     
    import com.ssh.entities.Employee;
     
    public class EmployeeDao extends BaseDao{
    	public void delete(Integer id) {
    		String hql = "DELETE From Employee e where e.id=?0";
    		getSession().createQuery(hql).setParameter(0,id).executeUpdate();
    	}
     
    	public List<Employee> getAll() {
    		//String hql = "From Employee e LEFT OUTER JOIN FETCH e.department";
    		String hql = "From Employee";
    		return getSession().createQuery(hql).list();
    	}
    	
    	public void saveOrUpdate(Employee employee) {
    		getSession().saveOrUpdate(employee);
    	}
    	
    	public Employee get(Integer id) {
    		return (Employee)getSession().get(Employee.class,id);
    	}
    }

（4）emp-list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <%@ taglib  prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    <script type="text/javascript" src = "js/jquery-2.1.4.min.js"></script>
    <script type="text/javascript">
    $(function(){
    	$(".delete").click(function(){
    		var lastName = $(this).next(":input").val();
    		var flag = confirm("确定要删除"+lastName+"的信息吗？");
    		if(flag){
    			var $tr = $(this).parent().parent();
    			var url = this.href;
    			var args = {"time":new Date()}
    			$.post(url,args,function(data){
    				if(data=="1"){
    					alert("删除成功!");
    					$tr.remove();
    				}else{
    					alert("删除失败!");
    				} 
    			}); 
    		} 
    		return false;
    	})
    })
    </script>
    </head>
    <body>
    	<h4>Employee List Page</h4>
    	<s:if test="#request.employees == null||#request.employees.size() == 0">
    		没有任何员工信息
    	</s:if>
    	<s:else>
    		<table border="1" cellpadding="10" cellspacing="0">
    			<tr>
    				<td>ID</td>
    				<td>LASTNAME</td>
    				<td>EMAIL</td>
    				<td>BIRTH</td>
    				<td>CREATETIME</td>
    				<td>delete</td>
    				<td>edit</td>
    			</tr>
    			<s:iterator value="#request.employees">
    				<tr>
    					<td>${id }</td>
    					<td>${lastName }</td>
    					<td>${email }</td>
    					<td>${birth }</td>
    					<td>${createTime }</td>
    					<td>
    						<a href="emp-delete?id=${id } " class="delete">Delete</a>
    						<input type="hidden" value="${lastName }"/>
    					</td>
    					<td><a href="emp-input?id=${id }">Edit</a></td>
    				</tr>
    			</s:iterator>
    		</table>
    	</s:else>
    </body>
    </html>

（5）emp-input.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <%@ taglib prefix="s" uri="/struts-tags" %>
    <!DOCTYPE html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    	<h4>Employee Input Page</h4>
    	<s:form action="emp-save" method="post">
    		<s:if test="id != null">
    			<s:textfield name="lastName" label="LastName" disabled="true"></s:textfield>
    			<s:hidden name="id"></s:hidden>
    		</s:if>
    		<s:else>
    			<s:textfield name="lastName" label="LastName"></s:textfield>
    		</s:else> 
    		<s:textfield name="email" label="Email"></s:textfield>
    		<s:textfield name="birth" label="Birth"></s:textfield>
    		<s:select list="#request.departments" 
    			listKey="id" listValue="departmentName" 
    			name="department.id" label="Department">
    		</s:select>
    		<s:submit></s:submit>
    	</s:form>
    </body>
    </html>

### 4、控制台输出 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1b3J1aV9qYXZh_size_16_color_FFFFFF_t_70 2][]

## 五、configuration ##

###    1、配置管理类：主要管理配置文件的一个类 ###

它拥有一个子类annotationConfiguration，也就是说我们可以使用注解来代替XML配置文件来配置相对应的信息。

![202108192207193.jpg][]

### 2、方法 ###

（1）configure方法用于加载配置文件：

如果指定参数，那么加载参数的路径配置文件  
如果不指定参数，默认加载src/目录下的hibernate.cfg.xml  
（2）buildSessionFactory()用于创建session工厂

（3）sessionFactory方法

SessionFactory-->Session的工厂，也可以说代表了hibernate.cfg.xml这个文件...hibernate.cfg.xml的就有<session-factory>这么一个节点

（4）openSession方法，创建一个session对象

（5）getCurrentSession方法，创建session对象或取出session对象

3、session  
session是hibernate最重要的对象，session维护了一个连接（connection），只要使用hibernate操作数据库，都需要使用session对象。

更新操作

使用save方法，调用这个方法把对象保存在数据库中，session对象提供其他方法进行对数据库的更新

*  session.save(obj); 【保存一个对象】
 *  session.update(obj); 【更新一个对象】
 *  session.saveOrUpdate(obj); 【保存或者更新的方法】
 *  没有设置主键，执行保存；
 *  有设置主键，执行更新操作;
 *  如果设置主键不存在报错！

## 六、HQL查询 ##

### 1、HQL ###

hibernate query language即hibernate提供的面向对象的查询语言

查询的是对象以及对象的属性，区分大小写

### 2、SQL ###

strut query language结构化查询语言。不区分大小写

### 3、本地SQL查询 ###

有的时候，如果SQL是非常复杂的，我们不能靠SQL查询来实现功能的话，我们就需要使用原生的SQL进行复杂查询，但是它有一个缺陷，不能跨平台，因此我们在主配置文件中已经配置了数据库的“方言”了。

//将所有的记录封装成User对象存进List集合中
    SQLQuery sqlQuery = session.createSQLQuery("SELECT * FROM user").addEntity(User.class);
     
    List list = sqlQuery.list();
     
    System.out.println(list);

## **七、beginTransaction方法** ##

开启事务，返回的是一个事务对象，hibernate规定所有的数据库都必须在事务环境下进行，否者报错！

###    1、数据库配置 ###

<session-factory>
        <property name="hibernate.dialect">org.hibernate.dialect.OracleDialect</property>
    	<property name="hibernate.connection.driverClass">oracle.jdbc.driver.OracleDriver</property>
    	<property name="hibernate.connection.username">mine</property>
    	<property name="hibernate.connection.password">mine</property>
    	<property name="hibernate.connection.jdbcUrl">jdbc:oracle:thin:@127.0.0.1:1521:orcl</property>
    	<property name="hibernate.show_sql">true</property>
    	<property name="hibernate.hbm2ddl.auto">update</property>
    		
    	<mapping resource="com/ssh/entities/Department.hbm.xml"/>
    	<mapping resource="com/ssh/entities/Employee.hbm.xml"/>
    </session-factory>

### 2、其它参数配置 ###

<property name="hibernateProperties">
        <props>
            
            <prop key="hibernate.dialect">
                org.hibernate.dialect.OracleDialect</prop>
            
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            
            <prop key="hibernate.show_sql">true</prop>
            
            <prop key="hibernate.format_sql">true</prop>
        </props>
    </property>

### 3、加载映射文件 ###

<property name="mappingResources">
        <list>
            
            <value>com/ssh/entities/Department.hbm.xml</value>
            <value>com/ssh/entities/Employee.hbm.xml</value>
            <value>hibernate.cfg.xml</value>
        </list>
    </property>

## 八、hibernate执行流程图 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1b3J1aV9qYXZh_size_16_color_FFFFFF_t_70 3][]

往期精彩内容：

[Java知识体系总结][Java]

[【全栈最全Java框架总结】SSH、SSM、Springboot][Java_SSH_SSM_Springboot]

[超详细的springBoot学习笔记][springBoot]

[常见数据结构与算法整理总结][Link 1]

[Java设计模式：23种设计模式全面解析][Java_23]

[Java面试题总结（附答案）][Java 1]

[10万字208道Java经典面试题总结(附答案，建议收藏)][10_208_Java]

[MySql知识体系总结][MySql]

[Linux知识体系总结][Linux]

[【Vue基础知识总结 1】Vue入门][Vue_ 1_Vue]

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[202108192207193.jpg]: /images/20220829/e1947b0f6476428394175503edf8142a.png
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[Java]: https://blog.csdn.net/guorui_java/article/details/112391105
[Java_SSH_SSM_Springboot]: https://blog.csdn.net/guorui_java/article/details/104018528
[springBoot]: https://blog.csdn.net/guorui_java/article/details/104137262
[Link 1]: https://blog.csdn.net/guorui_java/article/details/106217472
[Java_23]: https://blog.csdn.net/guorui_java/article/details/104026988
[Java 1]: https://blog.csdn.net/guorui_java/article/details/107803283
[10_208_Java]: https://blog.csdn.net/guorui_java/article/details/119299329
[MySql]: https://blog.csdn.net/guorui_java/article/details/118558095
[Linux]: https://blog.csdn.net/guorui_java/article/details/117430091
[Vue_ 1_Vue]: https://blog.csdn.net/guorui_java/article/details/106917601