Hibernate实战——映射数据库对象

小灰灰 2021-07-24 11:34 414阅读 0赞

**一 配置文件**

<?xml version="1.0" encoding="GBK"?>
    
    <!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="connection.driver_class">com.mysql.jdbc.Driver</property>
               
               <property  name="connection.url">jdbc:mysql://localhost/hibernate</property>
               
               <property name="connection.username">root</property>
               
               <property name="connection.password">32147</property>
               
               <property  name="hibernate.c3p0.max_size">20</property>
               
               <property name="hibernate.c3p0.min_size">1</property>
               
               <property  name="hibernate.c3p0.timeout">5000</property>
               
               <property  name="hibernate.c3p0.max_statements">100</property>
               <property  name="hibernate.c3p0.idle_test_period">3000</property>
               <property  name="hibernate.c3p0.acquire_increment">2</property>
               <property  name="hibernate.c3p0.validate">true</property>
               
               <property  name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
               
               <property name="hbm2ddl.auto">update</property>
               
               <property name="show_sql">true</property>
               
               <property name="hibernate.format_sql">true</property>
               
               <mapping  resource="org/crazyit/app/domain/News.hbm.xml"/>
         </session-factory>
    </hibernate-configuration>

**二 创建数据库对象**

<?xml version="1.0" encoding="gb2312"?>
    <!DOCTYPE hibernate-mapping PUBLIC
         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
    
    <hibernate-mapping>
         
         <database-object>
               
               <create>create table test(t_name  varchar(255));</create>
               
               <drop></drop>
               
               <dialect-scope  name="org.hibernate.dialect.MySQLDialect"/>
               <dialect-scope  name="org.hibernate.dialect.MySQL5InnoDBDialect"/>
         </database-object>   
    </hibernate-mapping>

**三 测试**

package lee;
    
    import org.hibernate.*;
    import org.hibernate.cfg.*;
    import org.hibernate.tool.hbm2ddl.*;
    import org.hibernate.service.*;
    import org.hibernate.boot.registry.*;
    
    public class NewsManager
    {
        public static void main(String[] args) throws Exception
        {
            // 实例化Configuration，configure()方法默认加载hibernate.cfg.xml文件
            Configuration conf = new Configuration().configure();
            // 以Configuration实例创建SessionFactory实例
            ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
                .applySettings(conf.getProperties()).build();
    //        conf.buildSessionFactory(serviceRegistry);
            // 创建SchemaExport对象
            SchemaExport se = new SchemaExport(conf);
            // 设置输出格式良好的SQL脚本
            se.setFormat(true)
                // 设置保存SQL脚本的文件名
                .setOutputFile("new.sql")
                // 输出SQL脚本，并执行SQL脚本
                .create(true, true);
        }
    }

**四 测试**

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