Hibernate之SchemaExport+配置文件生成表结构
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>