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Web环境Hibernate数据源问题补充

王朝other·作者佚名  2008-05-19
窄屏简体版  字體: |||超大  

在Hibernate.cfg.xml中配置的数据源只能在Web环境下使用,我们可以通过下面的例子来比较.

如果我们在HibernateSessionFactory中加上测试,代码如下:

package sc.pro.forum.util;

import net.sf.hibernate.HibernateException;

import net.sf.hibernate.Session;

import net.sf.hibernate.cfg.Configuration;

/**

* Configures and provides access to Hibernate sessions, tied to the

* current thread of execution.

Follows the Thread Local Session

* pattern, see {@link http://hibernate.org/42.html}.

*/

public class HibernateSessionFactory {

/**

* Location of hibernate.cfg.xml file.

* NOTICE: Location should be on the classpath as Hibernate uses

* #resourceAsStream style lookup for its configuration file. That

* is place the config file in a Java package - the default location

* is the default Java package.<br<br

* Examples: <br

* <codeCONFIG_FILE_LOCATION = "/hibernate.conf.xml".

* CONFIG_FILE_LOCATION = "/com/foo/bar/myhiberstuff.conf.xml".</code

*/

private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";

/** Holds a single instance of Session */

private static final ThreadLocal threadLocal = new ThreadLocal();

/** The single instance of hibernate configuration */

private static final Configuration cfg = new Configuration();

/** The single instance of hibernate SessionFactory */

private static net.sf.hibernate.SessionFactory sessionFactory;

/**

* Returns the ThreadLocal Session instance.

Lazy initialize

* the <codeSessionFactory</code if needed.

*

*

@return Session

*

@throws HibernateException

*/

public static Session currentSession() throws HibernateException {

Session session = (Session) threadLocal.get();

if (session == null) {

if (sessionFactory == null) {

try {

cfg.configure(CONFIG_FILE_LOCATION);

sessionFactory = cfg.buildSessionFactory();

}

catch (Exception e) {

System.err.println("%%%% Error Creating SessionFactory %%%%");

e.printStackTrace();

}

}

session = sessionFactory.openSession();

threadLocal.set(session);

}

return session;

}

/**

*

Close the single hibernate session instance.

*

*

@throws HibernateException

*/

public static void closeSession() throws HibernateException {

Session session = (Session) threadLocal.get();

threadLocal.set(null);

if (session != null) {

session.close();

}

}

public static void main(String[] args){

System.out.println("sdfsdfsd");

try{

Session

session=HibernateSessionFactory.currentSession();

if(session==null)

System.out.println("session is null");

else

System.out.println("session

is

not

null");

}catch(Exception e){

e.printStackTrace();

}

}

/**

* Default constructor.

*/

private HibernateSessionFactory() {

}

}

执行时,程序会给我们如下的错误:

Environment - Hibernate 2.1.7

Environment - hibernate.properties not found

Environment - using CGLIB reflection optimizer

Environment - using JDK 1.4 java.sql.Timestamp handling

sdfsdfsd

Configuration - configuring from resource: /hibernate.cfg.xml

Configuration - Configuration resource: /hibernate.cfg.xml

DTDEntityResolver - trying to locate http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd in classpath under net/sf/hibernate/

DTDEntityResolver - found http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd in classpath

Configuration - connection.datasource=java:comp/env/jdbc/forum

Configuration - show_sql=true

Configuration - dialect=net.sf.hibernate.dialect.SQLServerDialect

Configuration - null<-org.dom4j.tree.DefaultAttribute@18088c0 [Attribute: name resource value "sc/pro/forum/dao/Userinfo.hbm.xml"]

Configuration - Mapping resource: sc/pro/forum/dao/Userinfo.hbm.xml

DTDEntityResolver - trying to locate http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd in classpath under net/sf/hibernate/

DTDEntityResolver - found http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd in classpath

Binder - Mapping class: sc.pro.forum.dao.Userinfo - UserInfo

Binder - Mapped property: userid - UserID, type: integer

Binder - Mapped property: password - password, type: string

Binder - Mapped property: nickname - nickname, type: string

Configuration - Configured SessionFactory: null

Configuration - properties: {java.runtime.name=Java(TM) 2 Runtime Environment, Standard Edition, sun.boot.library.path=C:\Program Files\Java\j2re1.4.2_03\bin, java.vm.version=1.4.2_03-b02, connection.datasource=java:comp/env/jdbc/forum, java.vm.vendor=Sun Microsystems Inc., java.vendor.url=http://java.sun.com/, path.separator=;, java.vm.name=Java HotSpot(TM) Client VM, file.encoding.pkg=sun.io, user.country=CN, sun.os.patch.level=Service Pack 4, java.vm.specification.name=Java Virtual Machine Specification, user.dir=E:\86vr\forum, java.runtime.version=1.4.2_03-b02, java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment, java.endorsed.dirs=C:\Program Files\Java\j2re1.4.2_03\lib\endorsed, os.arch=x86, java.io.tmpdir=C:\DOCUME~1\zhangyi\LOCALS~1\Temp\, line.separator=

, java.vm.specification.vendor=Sun Microsystems Inc., user.variant=, os.name=Windows 2000, sun.java2d.fontpath=, hibernate.connection.datasource=java:comp/env/jdbc/forum, java.library.path=C:\Program Files\Java\j2re1.4.2_03\bin;.;C:\WINNT\system32;C:\WINNT;C:\WINNT\system32;C:\WINNT;C:\WINNT\System32\Wbem;d:\Program Files\cvsnt;D:\j2sdk1.4\bin;C:\Program Files\Microsoft SQL Server\80\Tools\BINN;C:\Program Files\CVSNT\, java.specification.name=Java Platform API Specification, java.class.version=48.0, java.util.prefs.PreferencesFactory=java.util.prefs.WindowsPreferencesFactory, os.version=5.0, user.home=C:\Documents and Settings\zhangyi, user.timezone=, java.awt.printerjob=sun.awt.windows.WPrinterJob, file.encoding=GBK, java.specification.version=1.4, show_sql=true, user.name=zhangyi, java.class.path=E:\86vr\forum\WebRoot\WEB-INF\classes;E:\86vr\forum\WebRoot\WEB-INF\lib\ant-1.5.3.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\ant-optional-1.5.3.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\c3p0-0.8.4.5.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\cglib-full-2.0.2.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\commons-collections-2.1.1.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\commons-dbcp-1.2.1.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\commons-lang-1.0.1.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\commons-logging-1.0.4.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\commons-pool-1.2.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\concurrent-1.3.3.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\connector.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\dom4j-1.4.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\ehcache-0.9.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\hibernate2.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\jaas.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\jboss-cache.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\jboss-common.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\jboss-jmx.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\jboss-system.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\jcs-1.0-dev.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\jdbc2_0-stdext.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\jgroups-2.2.7.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\jta.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\junit-3.8.1.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\log4j-1.2.8.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\msbase.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\mssqlserver.jar;E:\86vr\forum\WebRoot\WEB-INF\lib\msuti

 
 
 
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