Hibernate01_使用原生接口开发

川长思鸟来 2023-03-04 13:29 16阅读 0赞

**Hibernate01\_使用原生接口开发**

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*  **新建 Maven ⼯程，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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    	<groupId>com.blu</groupId>
    	<artifactId>hibernate</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.projectlombok</groupId>
    			<artifactId>lombok</artifactId>
    			<version>1.18.10</version>
    		</dependency>
    		<dependency>
    			<groupId>mysql</groupId>
    			<artifactId>mysql-connector-java</artifactId>
    			<version>8.0.19</version>
    		</dependency>
    		<dependency>
    			<groupId>org.hibernate</groupId>
    			<artifactId>hibernate-core</artifactId>
    			<version>5.4.12.Final</version>
    		</dependency>
    	</dependencies>
    </project>

*  **创建实体类**

package com.blu.entity;
    import lombok.Data;
    
    @Data
    public class People { 
    	private Integer id;
    	private String name;
    	private Double money;
    }

*  **对应数据库表**  
    ![在这里插入图片描述][20200803211617332.png]
 *  **hibernate.cfg.xml（全局配置文件）**

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 
            
            
    <hibernate-configuration>
    	 <session-factory>
    	 		
    	 		<property name="connection.username">root</property>
    	 		<property name="connection.password">123456</property>
    	 		<property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
    	 		<property name="connection.url">jdbc:mysql://localhost:3306/hibernatedemo?useUnicode=true&characterEncoding=UTF-8</property>
    	 		
    	 		
    	 		
    	 		<property name="hibernate.c3p0.acquire_increment">10</property>
    	 		
    	 		<property name="hibernate.c3p0.idle_test_period">10000</property>
    	 		
    	 		<property name="hibernate.c3p0.timeout">5000</property>
    	 		
    	 		<property name="hibernate.c3p0.max_size">30</property>
    	 		<property name="hibernate.c3p0.min_size">5</property>
    	 		
    			<property name="hibernate.c3p0.max_statements">10</property>
    	 		
    	 		
    	 		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
    	 		
    	 		<property name="show_sql">true</property>
    	 		<property name="format_sql">true</property>
    	 		
    	 		<property name="hibernate.hbm2ddl.auto"></property>
    	 		
    	 		
    	 		<mapping resource="com/blu/entity/People.hbm.xml"></mapping>
    	 </session-factory>		
    
    </hibernate-configuration>>

*  **People.hbm.xml（实体关系映射文件）**

<?xml version="1.0" encoding="UTF-8"?>
    <!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.blu.entity.People" table="people">
    		<id name="id" type="java.lang.Integer">
    			<column name="id"></column>
    			<generator class="identity"></generator>
    		</id>
    		<property name="name" type="java.lang.String">
    			<column name="name"></column>
    		</property>
    		<property name="money" type="java.lang.Double">
    			<column name="money"></column>
    		</property>
    	</class>
    
    </hibernate-mapping>

*  **测试**

package com.blu.test;
    
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.hibernate.cfg.Configuration;
    
    import com.blu.entity.People;
    
    public class Test { 
    	public static void main(String[] args) { 
    		//创建Configuration
    		//如果文件名不为hibernate.cfg.xml,则需要指定：
    		//Configuration configuration = new Configuration().configure("hibernate.xml");
    		Configuration configuration = new Configuration().configure();
    		//获取SessionFactory
    		SessionFactory sessionFactory = configuration.buildSessionFactory();
    		//获取Session
    		Session session = sessionFactory.openSession();
    		People people = new People();
    		people.setName("张三");
    		people.setMoney(1000.0);
    		session.save(people);
    		session.beginTransaction().commit();
    		session.close();
    	}
    	
    }

*  **结果：**

Hibernate: 
        insert 
        into
            people
            (name, money) 
        values
            (?, ?)

![在这里插入图片描述][20200803212251775.png]  
配置文件详解：

<property name="hibernate.hbm2ddl.auto">update</property>
    
    <property name="hibernate.hbm2ddl.auto">create</property>
    
    <property name="hibernate.hbm2ddl.auto">create-drop</property>
    
    <property name="hibernate.hbm2ddl.auto">validate</property>

[20200803211617332.png]: /images/20230208/aac5212c7dca46aebd587e1b874de941.png
[20200803212251775.png]: /images/20230208/07cacc3c11be443a9159d216ca139a06.png