2018.10.6 Hibernate配置文件详解-------ORM元数据配置 &&& hibernate主配置文件

Posted 2021-01-10 qichunlin

ORM既然是实体与关系数据库的映射，那就需要建立实体和关系数据库之间的基础数据，也可以称为元数据。简单的说就是表示类与表、列与属性（get、set方法）等等之间对应关系的数据。

Customer.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<!-- 配置表与实体对象之间的联系 -->
<!-- package属性：填写一个包名在元素内部凡是需要书写完整类名的属性，可以直接写类名 -->
<hibernate-mapping package="com.glut.domain">
    <!-- 
        class元素：配置实体与表的对应关系
            name：完整类名
            column：数据库表明
     -->
    <class name="Customer" table="cst_customer">
        <!-- id：配置主键映射的属性
                name：填写主键对应属性名
                column：填写表中的主键列名
         -->
        <id name="cust_id" column="cust_id">
            <!-- generator：主键生成策略 -->
            <generator class="native"></generator>
        </id>
        
        <!-- property元素：除id之外iadeputong属性映射
                name:填写属性名
                column：填写列名
                type(可选)：填写列(属性)的类型，hibernate会自动检测实体的属性类型
                每个类型有三种填法：java类型|hibernate类型|数据库类型
                not-null(可选)： 配置该属性是否不能为空，默认值：false
                length(可选)：配置数据库中列的长度，默认值：当前数据库类型最大长度
         -->
        <property name="cust_name" column="cust_name" ></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>

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>
        <!-- 
            #hibernate.dialect org.hibernate.dialect.mysqlDialect
            #hibernate.dialect org.hibernate.dialect.MySQLInnoDBDialect
            #hibernate.dialect org.hibernate.dialect.MySQLMyISAMDialect
            #hibernate.connection.driver_class com.mysql.jdbc.Driver
            #hibernate.connection.url jdbc:mysql:///test
            #hibernate.connection.username gavin
            #hibernate.connection.password
         -->
         <!-- 数据库驱动 -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        
        <!-- 数据库url -->
        <property name="hibernate.connection.url">jdbc:mysql:///crm</property>
        
        <!-- 数据库连接用户名 -->
        <property name="hibernate.connection.username">root</property>
        
        <!-- 数据库连接密码 -->
        <property name="hibernate.connection.password">123456</property>
        
        <!-- 数据库方言
            DDL: 定义语言
            DML：操纵语言  增删改查
            DCL：控制语言  事务 权限
            
            注意：MYSQL选择方言的时候选择最短的方言
         -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        
        <!--
            d://hibernate-day01
esourcehibernate-release-5.0.7.FinalprojectetcPROPERTIES
            关键字：show
            #hibernate.show_sql true     HBM生成sql并在控制台显示sql语句
            #hibernate.format_sql true   sql格式化显示
         -->
        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.format_sql">true</property>
        
        
        <!-- 
            关键字：hbm2
            ## auto schema export  自动导出表结构  自动建表
            #hibernate.hbm2ddl.auto create-drop  自动建表，每次框架运行结束都会将所有表删除.(开发环境中测试使用)
            #hibernate.hbm2ddl.auto create  自动建表，每次框架运行都会创建新的表，一千表将会被覆盖，表数据会丢失(开发环境中测试使用)
            #hibernate.hbm2ddl.auto update(推荐使用)  自动生成表，如果已经存在不会在生成。如果表有改动，自动更新表(不会删除任何数据)
            #hibernate.hbm2ddl.auto validate         校验,不自动生成表，每次启动会校验数据库中表是否正确。校验失败
         -->
        <property name="hibernate.hbm2ddl.auto">update</property>
        
        
        <!-- 引入orm元数据
            路径书写：填写src下的路径
         -->
        <mapping resource="com/glut/domain/Customer.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

实体对象

package com.glut.domain;


/**
 * Customer表对象
 * @author legend
 *
 */
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_linkman;
    private String cust_phone;
    private String cust_mobile;
    public Long getCust_id() {
        return cust_id;
    }
    public void setCust_id(Long cust_id) {
        this.cust_id = cust_id;
    }
    public String getCust_name() {
        return cust_name;
    }
    public void setCust_name(String cust_name) {
        this.cust_name = cust_name;
    }
    public String getCust_source() {
        return cust_source;
    }
    public void setCust_source(String cust_source) {
        this.cust_source = cust_source;
    }
    public String getCust_industry() {
        return cust_industry;
    }
    public void setCust_industry(String cust_industry) {
        this.cust_industry = cust_industry;
    }
    public String getCust_level() {
        return cust_level;
    }
    public void setCust_level(String cust_level) {
        this.cust_level = cust_level;
    }
    public String getCust_linkman() {
        return cust_linkman;
    }
    public void setCust_linkman(String cust_linkman) {
        this.cust_linkman = cust_linkman;
    }
    public String getCust_phone() {
        return cust_phone;
    }
    public void setCust_phone(String cust_phone) {
        this.cust_phone = cust_phone;
    }
    public String getCust_mobile() {
        return cust_mobile;
    }
    public void setCust_mobile(String cust_mobile) {
        this.cust_mobile = cust_mobile;
    }
    @Override
    public String toString() {
        return "Customer [cust_id=" + cust_id + ", cust_name=" + cust_name + ", cust_source=" + cust_source
                + ", cust_industry=" + cust_industry + ", cust_level=" + cust_level + ", cust_linkman=" + cust_linkman
                + ", cust_phone=" + cust_phone + ", cust_mobile=" + cust_mobile + "]";
    }
    public Customer(Long cust_id, String cust_name, String cust_source, String cust_industry, String cust_level,
            String cust_linkman, String cust_phone, String cust_mobile) {
        super();
        this.cust_id = cust_id;
        this.cust_name = cust_name;
        this.cust_source = cust_source;
        this.cust_industry = cust_industry;
        this.cust_level = cust_level;
        this.cust_linkman = cust_linkman;
        this.cust_phone = cust_phone;
        this.cust_mobile = cust_mobile;
    }
    public Customer() {
        super();
        // TODO Auto-generated constructor stub
    }
    
}

Hibernate测试

package com.glut.test;

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

import com.glut.domain.Customer;

/**
 * 测试Hibernate框架
 * @author legend
 *
 */
public class hbmTest {
    @Test
    //保存客户
    public void fun1() {
        Configuration conf = new Configuration().configure();
        
        SessionFactory sessionFactory = conf.buildSessionFactory();
        
        Session session = sessionFactory.openSession();
        
        Transaction tx = session.beginTransaction();
        
        //--------------------------------
        
        //创建对象
        Customer c = new Customer();
        c.setCust_name("腾讯公司");//执行保存s
        
        session.save(c);
        
        //-------------------------------
        
        tx.commit();
        session.close();
        sessionFactory.close();
    }
}