浅谈持久层ORM模型，Hibernate的概述，maven的java工程的Hibernate5.0.7配置

1. Hibernate 是什么&＃xff1f;

1、首先要理解 Hibernate 是什么&＃xff0c;一句话总结&＃xff1a;
Hibernate 是持久层 ORM 映射框架&＃xff1b;

2、什么是ROM 模型&＃xff1b;
实体 bean 和 table 之间关系映射&＃xff1b;

在很早以前&＃xff0c;sun 公司针对 各层设计分为 4层&＃xff0c;如下&＃xff1b;后面webApplet 被 更轻量的 js、html 取代&＃xff0c;省去了在客户端运行需要 jre 环境的操作&＃xff0c;大大加大了开发效率&＃xff0c;成为现在的经典三层web,service,dao架构模式&＃xff1b;针对每一层的解决方案如下&＃xff1a;

项目结构如下, xxx.hbm.xml 和 hibernate.cfg.xml命名要规范&＃xff0c;底层地洞调用该配置文件&＃xff1a;

点开hibernate的configuration底层查看&＃xff1a;

Hibernate的配置&＃xff0c;分为 mapper 和Hibernate核心文件的配置&＃xff1a;
&＃xff08;1&＃xff09;mapper配置&＃xff1a;



<hibernate-mapping><class name&＃61;"com.baidu.bean.Customer" table&＃61;"cst_customer"><id name&＃61;"cust_id" column&＃61;"cust_id"><generator class&＃61;"native">generator>id><property name&＃61;"cust_name" column&＃61;"cust_name">property><property name&＃61;"cust_source" column&＃61;"cust_source">property><property name&＃61;"cust_industry" column&＃61;"cust_industry">property><property name&＃61;"cust_level" column&＃61;"cust_level">property><property name&＃61;"cust_phone" column&＃61;"cust_phone">property><property name&＃61;"cust_mobile" column&＃61;"cust_mobile">property>class>
hibernate-mapping>


&＃xff08;2&＃xff09;核心配置文件配置&＃xff1a;



<hibernate-configuration><session-factory><property name&＃61;"hibernate.connection.driver_class">com.mysql.cj.jdbc.Driverproperty><property name&＃61;"hibernate.connection.url">jdbc:mysql:///test?serverTimezone&＃61;UTC&characterEncoding&＃61;UTF-8&useSSL&＃61;falseproperty><property name&＃61;"hibernate.connection.username">rootproperty><property name&＃61;"hibernate.connection.password">rootproperty><property name&＃61;"hibernate.dialect">org.hibernate.dialect.MySQLDialectproperty><property name&＃61;"hibernate.show_sql" >trueproperty><property name&＃61;"hibernate.format_sql">trueproperty><mapping resource&＃61;"com/baidu/bean/Customer.hbm.xml">mapping>session-factory>
hibernate-configuration>

pom.xml的配置&＃xff1a;


<project xmlns&＃61;"http://maven.apache.org/POM/4.0.0"xmlns:xsi&＃61;"http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation&＃61;"http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0modelVersion><groupId>hibernate1030day01groupId><artifactId>hibernate1030day01artifactId><version>1.0-SNAPSHOTversion><dependencies><dependency><groupId>junitgroupId><artifactId>junitartifactId><version>4.12version><scope>testscope>dependency><dependency><groupId>antlrgroupId><artifactId>antlrartifactId><version>2.7.7version>dependency><dependency><groupId>dom4jgroupId><artifactId>dom4jartifactId><version>1.6.1version>dependency><dependency><groupId>org.apache.geronimo.specsgroupId><artifactId>geronimo-jta_1.1_specartifactId><version>1.1.1version>dependency><dependency><groupId>org.hibernate.commongroupId><artifactId>hibernate-commons-annotationsartifactId><version>5.0.1.Finalversion>dependency><dependency><groupId>org.hibernategroupId><artifactId>hibernate-coreartifactId><version>5.0.7.Finalversion>dependency><dependency><groupId>org.hibernate.javax.persistencegroupId><artifactId>hibernate-jpa-2.1-apiartifactId><version>1.0.0.Finalversion>dependency><dependency><groupId>org.jbossgroupId><artifactId>jandexartifactId><version>2.0.0.Finalversion>dependency><dependency><groupId>org.javassistgroupId><artifactId>javassistartifactId><version>3.18.1-GAversion>dependency><dependency><groupId>org.jboss.logginggroupId><artifactId>jboss-loggingartifactId><version>3.3.0.Finalversion>dependency><dependency><groupId>mysqlgroupId><artifactId>mysql-connector-javaartifactId><version>8.0.11version><scope>runtimescope>dependency><dependency><groupId>log4jgroupId><artifactId>log4jartifactId><version>1.2.17version>dependency><dependency><groupId>org.slf4jgroupId><artifactId>slf4j-apiartifactId><version>1.7.25version>dependency><dependency><groupId>org.slf4jgroupId><artifactId>slf4j-log4j12artifactId><version>1.7.25version><scope>testscope>dependency>dependencies><build><resources><resource><directory>src/main/javadirectory><includes><include>**/*.xmlinclude>includes><filtering>truefiltering>resource><resource><directory>src/main/resourcesdirectory><includes><include>**/*.xmlinclude><include>**/*.propertiesinclude>includes>resource>resources>build>
project>


测试类&＃xff1a;

/*** &＃64;auther SyntacticSugar* &＃64;data 2018/10/30 0030下午 6:21*/
public class HibernateTest {&＃64;Testpublic void test01(){/** 配置是hibernate中的 org.hibernate.cfg.Configuration* 加载配置文件* 创建sessionFactory* 创建session 会话对象*/Configuration configuration&＃61;new Configuration().configure();SessionFactory sessionFactory &＃61; configuration.buildSessionFactory();Session session &＃61; sessionFactory.openSession();//开启事务Transaction transaction &＃61; session.beginTransaction();Customer customer &＃61; new Customer();customer.setCust_name("打豆豆");session.save(customer);//忘记保存了//提交事务&＃xff0c;关闭会话transaction.commit();session.clear();}
}

和数据库 table 对应的实体类&＃xff0c;提供setter 、getter、toString&＃xff1a;

/*** &＃64;auther SyntacticSugar* &＃64;data 2018/10/30 0030下午 4:58*/
public class Customer {private Long cust_id;private String cust_name;private String cust_source;private String cust_industry;private String cust_level;private String cust_phone;private String cust_mobile;// 提供setter 、getter、toString}