Hibernate01-快速入门案例

最新推荐文章于 2022-07-18 18:36:18 发布

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本文详细介绍Hibernate框架的使用步骤，包括环境搭建、配置文件设置、实体类与映射文件编写及简单的CRUD操作。

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01-下载Hibernate的压缩包。

02-导入数据库驱动包 + log4j日志包 + hibernate压缩包的required文件夹下面的jar包

03-导入log4j.properties文件

    ### set log levels ###  
    log4j.rootLogger = INFO , console , debug , error  
      
    ### console ###  
    log4j.appender.console = org.apache.log4j.ConsoleAppender  
    log4j.appender.console.Target = System.out  
    log4j.appender.console.layout = org.apache.log4j.PatternLayout  
    log4j.appender.console.layout.ConversionPattern = %-d{yyyy-MM-dd HH\:mm\:ss} [%p]-[%c] %m%n  
      
    ### log file ###  
    log4j.appender.debug = org.apache.log4j.DailyRollingFileAppender  
    log4j.appender.debug.File = ../logs/springmvc-demo.log  
    log4j.appender.debug.Append = true  
    log4j.appender.debug.Threshold = INFO  
    log4j.appender.debug.layout = org.apache.log4j.PatternLayout  
    log4j.appender.debug.layout.ConversionPattern = %-d{yyyy-MM-dd HH\:mm\:ss} [%p]-[%c] %m%n  
      
    ### exception ###  
    log4j.appender.error = org.apache.log4j.DailyRollingFileAppender  
    log4j.appender.error.File = ../logs/springmvc-demo_error.log  
    log4j.appender.error.Append = true  
    log4j.appender.error.Threshold = ERROR  
    log4j.appender.error.layout = org.apache.log4j.PatternLayout  
    log4j.appender.error.layout.ConversionPattern = %-d{yyyy-MM-dd HH\:mm\:ss} [%p]-[%c] %m%n  
      
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender  
    log4j.appender.stdout.Target=System.out  
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout  
    log4j.appender.stdout.layout.ConversionPattern=%d{ISO8601} %l %c%n%p: %m%n  
      
    ### druid sql ###  
    log4j.logger.druid.sql=warn,stdout  
    log4j.logger.druid.sql.DataSource=warn,stdout  
    log4j.logger.druid.sql.Connection=warn,stdout  
    log4j.logger.druid.sql.Statement=warn,stdout  
    log4j.logger.druid.sql.ResultSet=warn,stdout

04-创建一个名为hib01的空数据库

05-准备实体类(JavaBean)


public class Customer implements Serializable{
            	
     private Long cust_id;
     private String cust_name;
     private Long cust_user_id;
     private Long cust_create_id;
     private String cust_source;
     private String cust_industry;
     private String cust_level;
     private String cust_linkman;
     private String cust_phone;
     private String cust_mobile;
            	
     // setter and getter 略
}

06-编写映射配置文件：名称：实体类名.hbm.xml, 位置：建议与JavaBean在同一个包


<?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>
    <!-- 配置实体类与表结构的映射 -->
    <class name="com.hngy.domain.Customer" table="cst_customer">
         <!-- 配置主键 -->
         <id name="cust_id" column="cust_id">
            	<!-- 配置主键生成策略 -->
            	<generator class="native"></generator>
         </id>
            		
         <!-- 配置其他属性 -->
         <property name="cust_name" column="cust_name"></property>
         <property name="cust_user_id" column="cust_user_id"></property>
         <property name="cust_create_id" column="cust_create_id"></property>
         <property name="cust_source" column="cust_source"></property>
         <property name="cust_industry" column="cust_industry"></property>
         <property name="cust_level" column="cust_level"></property>
         <property name="cust_linkman" column="cust_linkman"></property>
         <property name="cust_phone" column="cust_phone"></property>
         <property name="cust_mobile" column="cust_mobile"></property>
     </class>
</hibernate-mapping>

07-编写核心配置文件：名称：hibernate.cfg.xml, 位置：建议在Src下

<?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>
	<!-- 一个数据库对应一个<session-factory>标签 -->
	<session-factory>
		<!-- 一、必须配置：4大参数 + 方言 -->
		<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="hibernate.connection.url">jdbc:mysql:///hib01</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password">root</property>
		
		<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
		
		<!-- 二、可选配置 -->
		<!-- 显示SQL语句，(控制台) -->
		<property name="hibernate.show_sql">true</property>
		<!-- 格式化SQL语句 -->
		<property name="hibernate.format_sql">true</property>
		<!-- 修改 (若无表，则创建；若有表，则修改) -->
		<property name="hibernate.hbm2ddl.auto">update</property>
		
		<!-- 三、引入映射配置文件 -->
		<mapping resource="com/hngy/domain/Customer.hbm.xml"/>
	</session-factory>
</hibernate-configuration>

08-编写hibernateUtils工具类，简化一下crud操作

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

/**
 * Hibernate框架的工具类
 * @author Administrator
 */
public class HibernateUtils {
	
	private static final Configuration CONFIG;
	private static final SessionFactory FACTORY;
	
	// 编写静态代码块
	static{
		// 加载XML的配置文件
		CONFIG = new Configuration().configure();
		// 构造工厂
		FACTORY = CONFIG.buildSessionFactory();
	}
	
	/**
	 * 从工厂中获取Session对象
	 * @return
	 */
	public static Session getSession(){
		return FACTORY.openSession();
	}
	
}

09-编写测试类

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

import com.hngy.domain.Customer;
import com.hngy.utils.HibernateUtils;

public class HibTest {

	/**
	 * 测试2：使用工具类，添加数据
	 */
	@Test
	public void testAddByUtils(){
		// 01-创建Session对象
		Session session = HibernateUtils.getSession();
		// 02-开启事务
		Transaction tr = session.beginTransaction();
		// 03-编写crud代码
		Customer c = new Customer();
		c.setCust_name("周其");
		c.setCust_level("★★");
		// 保存
		session.save(c);
		// 04-提交事务
		tr.commit();
		// 05-释放资源
		session.close();
	}

	/**
	 * 测试1：添加数据
	 */
	@Test
	public void testAdd(){
		// 01-加载配置文件
		Configuration config = new Configuration();
		config.configure();// 默认加载src下的hibernate.cfg.xml
		// 02-创建SessionFactory对象
		SessionFactory factory = config.buildSessionFactory();
		// 03-创建Session对象
		Session session = factory.openSession();
		// 04-开启事务
		Transaction tr = session.beginTransaction();
		// 05-编写crud代码
		Customer c = new Customer();
		c.setCust_name("李四");
		c.setCust_level("★");
		// 保存
		session.save(c);
		// 06-提交事务
		tr.commit();
		// 07-释放资源
		session.close();
		factory.close();
	}
	
}