hibernate的链接数据库的基本步骤
① 在package Hibernate新建一个sdUser的class
代码如下：
package Hibernate;
public class sdUser {
private String id;
private String name;
private char sex;
private int age;
public int getAge() {
return age;
}
public String getId() {
return id;
}
public String getName() {
return name;
}
public char getSex() {
return sex;
}
public void setAge(int i) {
age = i;
}
public void setId(String string) {
id = string;
}
public void setName(String string) {
name = string;
}
public void setSex(char c) {
sex = c;
}
}
② 在package Hibernate下new一个sdUser.hbm.xml的xml文件。（这个xml文件的作用为告诉Hibernate如何映射至DB中相应的table的）
选中jbuilder中package Hibernate（右击）->new->file弹出create new file对话框，我们选中type : xml，name: sdUser.hbm
我们也可以在c:\Hibernate\src\Hibernate直接建一个sdUser.hbm.xml的文件。
代码如下：
<?xml version=”1.0″?>
<!DOCTYPE hibernate-mapping
PUBLIC “-//Hibernate/Hibernate Mapping DTD//EN”
“http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd“>
<hibernate-mapping>
<class name=”Hibernate.sdUser” table=”sdUSER”>
<id name=”id” type=”string” unsaved-value=”null”>
<column name=”user_id” sql-type=”char(32)” />
<generator class=”uuid.hex”/>
</id>
<property name=”name” type=”string” not-null=”true”>
<column name=”name” length=”16″ not-null=”true”/>
</property>
<property name=”sex” type=”char”/>
<property name=”age” type=”int”/>
</class>
</hibernate-mapping>
③ 在package Hibernate新建一个Example的class
代码如下
package Hibernate;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import org.hibernate.*;
import org.hibernate.cfg.Configuration;
public class Example{
private static SessionFactory _sessions = null;
private static Properties pops = new Properties();
static{
try {
//读取上面设的hibernate.properties
InputStream stream = Example.class.getResourceAsStream(“hibernate.properties”);
try {
pops.load(stream);
} catch (IOException e1) {
e1.printStackTrace();
}
Configuration cfg = new Configuration();
cfg.addClass(sdUser.class);
cfg.setProperties(pops);
_sessions = cfg.buildSessionFactory();
} catch (MappingException e) {
e.printStackTrace();
} catch (HibernateException e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws HibernateException {
sdUser sduser = new sdUser();
sduser.setName(“caterpillar”);
sduser.setSex(\’M\’);
sduser.setAge(28);
Session session = _sessions.openSession();
Transaction tx = null;
try{
tx = session.beginTransaction();
session.save(sduser);
tx.commit();
}catch(HibernateException he){
if(tx != null) tx.rollback();
throw he;
}
finally{
session.close();
}
}
}
4 接着导入hibernate所需要的包， 然后是hibernate.cfg.xml文件的配置，详细请看另一篇博客