Hibernate之SchemaExport+配置文件生成表结构

时间:2023-03-08 17:02:23

首先要生成表,得先有实体类,以Person.java为例:

/**
*
* @author Administrator
* @hibernate.class table="T_Person"
*/
public class Person { /**
* @hibernate.id
* generator-class="native"
*/
private int id; /**
* @hibernate.property
*/
private String name; /**
* @hibernate.property
*/
private String sex; /**
* @hibernate.property
*/
private String address; /**
* @hibernate.property
*/
private String duty; /**
* @hibernate.property
*/
private String phone; /**
* @hibernate.property
*/
private String description; /**
* @hibernate.many-to-one
*/
private Orgnization org; public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getDuty() {
return duty;
}
public void setDuty(String duty) {
this.duty = duty;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Orgnization getOrg() {
return org;
}
public void setOrg(Orgnization org) {
this.org = org;
}
}

接下来就是Person类对应的配置文件Person.hbm.xml,配置如下:

<hibernate-mapping>
<class table="T_Person" name="com.tgb.model.Person">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<property name="sex"/>
<property name="address"/>
<property name="duty"/>
<property name="phone"/>
<property name="description"/>
<many-to-one name="org"></many-to-one>
</class>
</hibernate-mapping>

还有包含Person.hbm.xml相关信息的Hibernate默认配置文件,hibernate.cfg.xml:

<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://127.0.0.1/test</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">123456</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/tgb/model/Person.hbm.xml"/>
</session-factory>
</hibernate-configuration>

最后我们还需要一个根据上述内容生成数据表的小工具,即ExportDB.Java:

import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport; public class ExportDB { /**
* @param args
*/
public static void main(String[] args) { // 默认读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure(); // 生成并输出sql到文件(当前目录)和数据库
SchemaExport export = new SchemaExport(cfg); // 创建表结构,第一个true 表示在控制台打印sql语句,第二个true 表示导入sql语句到数据库
export.create(true, true);
}
}

完成以上步骤以后,只需要执行ExportDB类即可,当然前提是已经在mysql中创建了对应的数据库,我们这里创建了一个名为test的测试数据库。执行成功之后我们就可以看到数据库里已经有了我们的t_person表了

//ssh下配置

配置好person类和hbm.xml文件后,在spring配置文件中<sessionfactory>中加上

<prop key="hibernate.hbm2ddl.auto">
update
</prop>