在Hibernate中使用SessionFactory.getCurrentSession（）时获取Connection对象

Question

我在使用Connection时试图在Hibernate中获取SessionFactory.getCurrentSession()个对象。

源代码

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.internal.SessionImpl;

public class SOExample {
    public static void main(String[] args) throws SQLException {
        Configuration configuration = new Configuration();
        SessionFactory  sessionFactory = configuration.buildSessionFactory(new StandardServiceRegistryBuilder().configure().build());
        Session session = sessionFactory.getCurrentSession();
        Connection connection = ((SessionImpl) session).connection();
        // doing operation on connection object as per my requirement
        DatabaseMetaData databaseMetaData = connection.getMetaData();
        System.out.println(databaseMetaData.getDatabaseProductName());
    }
}

堆栈跟踪

Exception in thread "main" java.lang.ClassCastException: com.sun.proxy.$Proxy24 cannot be cast to org.hibernate.internal.SessionImpl
    at com.SOExample.main(SOExample.java:20)

getCurrentSession()提供Proxy Session对象，因此无法将其投放到SessionImpl，那么获取Connection对象的其他方法是什么？ 。或如何从代理对象SessionImpl。

我试过的其他选项，但它说找不到getConnectionProvider()方法。

SessionFactoryImplementor sessionFactoryImplementation = (SessionFactoryImplementor) session.getSessionFactory();
ConnectionProvider connectionProvider = sessionFactoryImplementation.getConnectionProvider();
try {
    Connection connection = connectionProvider.getConnection();
} catch (SQLException e) {
    e.printStackTrace();
}

注意：我使用 hibernate-core-5.0.5.Final.jar

Answer 1

在 Hibenate 5中，我们需要做一些不同的事情（有关详情，请查看https://docs.jboss.org/hibernate/orm/5.2/userguide/html_single/Hibernate_User_Guide.html）：

<?php 
$data_string = array('grant_type'=>'authorization_code',
'orgID'=>'ORG_bbfad6',
'access_token'=>'c309792551930b835a0163835097bfc9ac4e31be',
'fromDate'=>'2016-09-21',
'toDate'=>'2016-09-21');   

//Web API URL                                                                         
$service_url='http://192.168.65.106:8080/test/range';   

$ch = curl_init($service_url);                                                                      

//request header
$headers = array( 
        //"POST "." HTTP/1.0", 
        "Content-type:application/x-www-form-urlencoded", 
        "Accept:application/json",
        "Cache-Control: no-cache", 
        "Connection: Keep-Alive",
        "Pragma: no-cache", 
); 

//curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);      

curl_setopt($ch, CURLOPT_TIMEOUT, 60);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60);  
curl_setopt($ch, CURLOPT_HTTPHEADER,$headers);                                                                                                          
$curl_response = curl_exec($ch);

if ($curl_response === false)
{
    $info = curl_getinfo($ch);
    curl_close($ch);
    die('error occured during curl exec. Additioanl info: ' . var_export($info));
}

$decoded = json_decode($curl_response);

curl_close($ch);
echo 'response ok!';
print("<pre>");
var_dump($decoded);
 print("</pre>");

如果您想测试代码，我的配置为derby db。

[{"--------------------------95901a4b56edd440\r\nContent-Disposition:_form-data;_name":"\"grant_type\"\r\n\r\nauthorization_code\r\n--------------------------95901a4b56edd440\r\nContent-Disposition: form-data; name=\"orgID\"\r\n\r\nORG_bbfad6\r\n--------------------------95901a4b56edd440\r\nContent-Disposition: form-data; name=\"access_token\"\r\n\r\nc309792551930b835a0163835097bfc9ac4e31be\r\n--------------------------95901a4b56edd440\r\nContent-Disposition: form-data; name=\"fromDate\"\r\n\r\n2016-09-21\r\n--------------------------95901a4b56edd440\r\nContent-Disposition: form-data; name=\"toDate\"\r\n\r\n2016-09-21\r\n--------------------------95901a4b56edd440--\r\n","0":"\"grant_type\"\r\n\r\nauthorization_code\r\n--------------------------95901a4b56edd440\r\nContent-Disposition: form-data; name=\"orgID\"\r\n\r\nORG_bbfad6\r\n--------------------------95901a4b56edd440\r\nContent-Disposition: form-data; name=\"access_token\"\r\n\r\nc309792551930b835a0163835097bfc9ac4e31be\r\n--------------------------95901a4b56edd440\r\nContent-Disposition: form-data; name=\"fromDate\"\r\n\r\n2016-09-21\r\n--------------------------95901a4b56edd440\r\nContent-Disposition: form-data; name=\"toDate\"\r\n\r\n2016-09-21\r\n--------------------------95901a4b56edd440--\r\n"}]

此应用的输出：