Hibernate运行环境搭建

冷不防 2022-09-23 08:28 329阅读 0赞

导入相关jar包：

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实体User.java

package com.dx.pojo;  
  
public class User \{  
private Integer userId;  
private String name;  
private String pass;  
  
public User()\{\}  
public User(String name,String pass)\{  
this.name = name;  
this.pass = pass;  
\}  
public Integer getUserId() \{  
return userId;  
\}  
public void setUserId(Integer userId) \{  
this.userId = userId;  
\}  
public String getName() \{  
return name;  
\}  
public void setName(String name) \{  
this.name = name;  
\}  
public String getPass() \{  
return pass;  
\}  
public void setPass(String pass) \{  
this.pass = pass;  
\}  
@Override  
public String toString() \{  
return "User \[userId=" + userId + ", name=" + name + ", pass=" + pass  
\+ "\]";  
\}  
  
\}

对应表user

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配置文件hibernate.cfg.xml

<!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.dialect">org.hibernate.dialect.MySQLDialect</property>  
<property name="connection.url">jdbc:mysql://localhost:3306/test</property>  
<property name="connection.driver\_class">com.mysql.jdbc.Driver</property>  
<property name="connection.username">root</property>  
<property name="hibernate.connection.password">123456</property>  
  
  
<property name="hibernate.show\_sql">true</property>  
<property name="hibernate.format\_sql">false</property>  
  
<property name="hbm2ddl.auto">update</property>  
  
  
<mapping resource="com/dx/pojo/user.hbm.xml"/>  
  
</session-factory>  
</hibernate-configuration>  
  
单个实体对应的映射文件(user.hbm.xml)

<?xml version='1.0' encoding='UTF-8'?>  
<!DOCTYPE hibernate-mapping PUBLIC  
          "-//Hibernate/Hibernate Mapping DTD 3.0//EN"  
          "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">  
<hibernate-mapping>  
<class name="com.dx.pojo.User" table="user">  
<id name="userId" column="t\_id" type="java.lang.Integer">  
<generator class="identity"/>  
</id>  
<property name="name" type="java.lang.String" column="t\_name"/>  
<property name="pass" type="java.lang.String" column="t\_pass"/>  
</class>  
  
</hibernate-mapping>

工具类HibernateSessionFactory.java

package com.dx.util;  
  
import org.hibernate.HibernateException;  
import org.hibernate.Session;  
import org.hibernate.cfg.Configuration;  
public class HibernateSessionFactory \{  
  
    private static String CONFIG\_FILE\_LOCATION = "/hibernate.cfg.xml";  
private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();  
    private  static Configuration configuration = new Configuration();      
    private static org.hibernate.SessionFactory sessionFactory;  
    private static String configFile = CONFIG\_FILE\_LOCATION;  
  
  
static \{  
    try \{  
configuration.configure(configFile);  
sessionFactory = configuration.buildSessionFactory();  
\} catch (Exception e) \{  
System.err.println("%%%% Error Creating SessionFactory %%%%");  
e.printStackTrace();  
\}  
    \}  
  
    private HibernateSessionFactory() \{  
    \}  
  
    public static Session getSession() throws HibernateException \{  
        Session session = (Session) threadLocal.get();  
  
  
if (session == null || !session.isOpen()) \{  
if (sessionFactory == null) \{  
rebuildSessionFactory();  
\}  
session = (sessionFactory != null) ? sessionFactory.openSession() : null;  
threadLocal.set(session);  
\}  
  
  
        return session;  
    \}  
  
public static void rebuildSessionFactory() \{  
try \{  
configuration.configure(configFile);  
sessionFactory = configuration.buildSessionFactory();  
\} catch (Exception e) \{  
System.err.println("%%%% Error Creating SessionFactory %%%%");  
e.printStackTrace();  
\}  
\}  
  
    public static void closeSession() throws HibernateException \{  
        Session session = (Session) threadLocal.get();  
        threadLocal.set(null);  
  
  
        if (session != null) \{  
            session.close();  
        \}  
    \}  
  
public static org.hibernate.SessionFactory getSessionFactory() \{  
return sessionFactory;  
\}  
  
public static void setConfigFile(String configFile) \{  
HibernateSessionFactory.configFile = configFile;  
sessionFactory = null;  
\}  
  
  
public static Configuration getConfiguration() \{  
return configuration;  
\}  
  
\}

测试：Test.java

package com.dx.test;  
  
import java.util.List;  
import org.hibernate.Query;  
import org.hibernate.Session;  
import com.dx.pojo.User;  
import com.dx.util.HibernateSessionFactory;  
  
public class Test \{  
public static void main(String\[\] args) \{  
findAll();  
//baocun();  
\}  
  
//查找所有记录  
public  static void findAll()\{  
String hql = "from User";  
Query query = HibernateSessionFactory.getSession().createQuery(hql);  
List<User> list = query.list();  
for(User g:list)\{  
System.out.println(g);  
\}  
\}  
  
//保存  
public static void baocun()\{  
User good = new User("zhangsan","12324");  
Session session = HibernateSessionFactory.getSession();  
//开启事务  
org.hibernate.Transaction t = session.beginTransaction();  
session.save(good);  
t.commit();  
\}  
\}

[Center]: /images/20220721/73e60b25e69f4e1fae10ec35abd0ac2a.png
[Center 1]: /images/20220721/bc825c91ab3b45dd8f17d04f4c7b8cff.png