hibernate-exportDB

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hibernate框架，自己一直在门外徘徊，迟迟进不去。这次hibernate又一次展现了他的魅力。原来hibernate还有将实体代码导出数据表的功能，太神奇了。

需求：

将用户实体，通过hibernate框架导出数据库user表。

Demo

mysql数据库连接：

<hibernate-configuration>   <session-factory>      <!--配置数据库-->      <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>      <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_first</property>      <property name="hibernate.connection.username">root</property>      <property name="hibernate.connection.password">root</property>      <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>      <mapping resource="com/zhou/hibernate/User.hbm.xml"/>   </session-factory></hibernate-configuration>

实体类：

package com.zhou.hibernate;import java.util.Date;/** * User实体类 * Created by zhou on 2017/3/21. */public class User {    private String id;    private String name;    private String password;    private Date createTime;    private Date expireTime;    public String getId() {        return id;    }    public void setId(String id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public Date getCreateTime() {        return createTime;    }    public void setCreateTime(Date createTime) {        this.createTime = createTime;    }    public Date getExpireTime() {        return expireTime;    }    public void setExpireTime(Date expireTime) {        this.expireTime = expireTime;    }}

User.hbm.xml：

<hibernate-mapping><class name="com.zhou.hibernate.User">    <id name="id">        <generator class="uuid"/>    </id>    <property name="name"/>    <property name="password"/>    <property name="createTime"/>    <property name="expireTime"/></class></hibernate-mapping>

导入方法：

package com.zhou.hibernate;import org.hibernate.cfg.Configuration;import org.hibernate.tool.hbm2ddl.SchemaExport;/** * 将hbm生成ddl * Created by zhou on 2017/3/21. */public class ExportDB {    public static void main (String[] args){        //默认读取hibernate.cfg.xml文件        Configuration cfg = new Configuration().configure();        SchemaExport export = new SchemaExport(cfg);        export.create(true,true);    }}

点击小蜘蛛出现：

这里hibernate自带的机制会根据属性的数据类型分配合适的字段长度。

效果图

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