Hibernate生成数据库表-优快云博客

本文介绍如何使用Hibernate进行实体类定义与数据库表映射的过程。通过创建实体类、生成hbm.xml文件并配置hibernate.cfg.xml，最终利用ExportDB类自动生成数据库表。

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首先创建实体类

import java.util.Date;

public class ProductionEntity {
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getOrigin() {
        return origin;
    }

    public void setOrigin(String origin) {
        this.origin = origin;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price = price;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    private Integer id;
    private String origin;
    private Double price;
    private Date date;
}

然后Eclipse中在实体类上右键New-Other-Hibernate-Hibernate XML Mapping file(hbm.xml)

点击Finish 即可生成ProductionEntity.hbm.xml

打开ProductionEntity.hbm.xml 可以修改里面的内容

有了hbm.xml文件之后需要将其添加到项目的hibernate.cfg.xml中去

<?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>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.password">12345678</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost/test</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="hibernate.show_sql">true</property>  
        <property name="hibernate.hbm2ddl.auto">update</property>  
        <property name="hibernate.current_session_context_class">thread</property>  
        <mapping resource="com/Mageric/entity/ExchangeEntity.hbm.xml"/>  
    </session-factory>
</hibernate-configuration>

有了实体类和对应的Hibernate配置文件后还需要一个ExportDB类来生成数据库表

import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.boot.spi.MetadataImplementor;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.tool.hbm2ddl.SchemaExport;

public class ExportDB {
    /**
     * @param args
     */
    public static void main(String[] args) {
        ServiceRegistry serviceRegistry = (ServiceRegistry) new StandardServiceRegistryBuilder().configure().build();
        MetadataImplementor metadataImplementor = (MetadataImplementor) new MetadataSources(serviceRegistry)
                .buildMetadata();
        SchemaExport export = new SchemaExport(serviceRegistry, metadataImplementor);
        export.create(true, true);
    }
}