采用编程式事务

采用编程式事务

1、getCurrentSession()与openSession()的区别？
* 采用getCurrentSession()创建的session会绑定到当前线程中，而采用openSession()
  创建的session则不会
* 采用getCurrentSession()创建的session在commit或rollback时会自动关闭，而采用openSession()
  创建的session必须手动关闭
 
2、使用getCurrentSession()需要在hibernate.cfg.xml文件中加入如下配置：
* 如果使用的是本地事务（jdbc事务）
<property name="hibernate.current_session_context_class">thread</property>
* 如果使用的是全局事务（jta事务）
<property name="hibernate.current_session_context_class">jta</property>


hibernate.cfg.xml

引用

<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.url">jdbc:mysql://localhost/spring_hibernate_1</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">bjsxt</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.current_session_context_class">thread</property>
<!--
<property name="hibernate.current_session_context_class">jta</property>
-->
<mapping resource="com/bjsxt/usermgr/model/User.hbm.xml"/>
<mapping resource="com/bjsxt/usermgr/model/Log.hbm.xml"/>
</session-factory>
</hibernate-configuration>

 

log4j.properties

引用

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file hibernate.log ###
#log4j.appender.file=org.apache.log4j.FileAppender
#log4j.appender.file.File=hibernate.log
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=warn, stdout

#log4j.logger.org.hibernate=info
#log4j.logger.org.hibernate=debug

### log HQL query parser activity
#log4j.logger.org.hibernate.hql.ast.AST=debug

### log just the SQL
#log4j.logger.org.hibernate.SQL=debug

### log JDBC bind parameters ###
#log4j.logger.org.hibernate.type=info
#log4j.logger.org.hibernate.type=debug

### log schema export/update ###
#log4j.logger.org.hibernate.tool.hbm2ddl=debug

### log HQL parse trees
#log4j.logger.org.hibernate.hql=debug

### log cache activity ###
#log4j.logger.org.hibernate.cache=debug

### log transaction activity
#log4j.logger.org.hibernate.transaction=debug

### log JDBC resource acquisition
#log4j.logger.org.hibernate.jdbc=debug

### enable the following line if you want to track down connection ###
### leakages when using DriverManagerConnectionProvider ###
#log4j.logger.org.hibernate.connection.DriverManagerConnectionProvider=trace

ExportDB.java

package com.bjsxt.usermgr.util;

import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;

public class ExportDB {

	public static void main(String[] args) {
		
		//读取hibernate.cfg.xml文件
		Configuration cfg = new Configuration().configure();
		
		SchemaExport export = new SchemaExport(cfg);
		
		export.create(true, true);
	}
}

HibernateUtils.java

package com.bjsxt.usermgr.util;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtils {

	private static SessionFactory factory;
	
	static {
		try {
			Configuration cfg = new Configuration().configure();
			factory = cfg.buildSessionFactory();
		}catch(Exception e) {
			e.printStackTrace();
		}
	}
	
	public static SessionFactory getSessionFactory() {
		return factory;
	}
	
	public static Session getSession() {
		return factory.openSession();
	}
	
	public static void closeSession(Session session) {
		if (session != null) {
			if (session.isOpen()) {
				session.close();
			}
		}
	}
}

Log.java

package com.bjsxt.usermgr.model;

import java.util.Date;

public class Log {
	
	private int id;
	
	//操作日志、安全日志、事件日志
	private String type;
	
	private String detail;
	
	private Date time;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getType() {
		return type;
	}

	public void setType(String type) {
		this.type = type;
	}

	public String getDetail() {
		return detail;
	}

	public void setDetail(String detail) {
		this.detail = detail;
	}

	public Date getTime() {
		return time;
	}

	public void setTime(Date time) {
		this.time = time;
	}
}

Log.hbm.xml

引用

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.bjsxt.usermgr.model">
<class name="Log" table="t_log">
<id name="id">
<generator class="native"/>
</id>
<property name="type"/>
<property name="detail"/>
<property name="time"/>
</class>
</hibernate-mapping>

User.java

package com.bjsxt.usermgr.model;

public class User {
	
	private int id;
	
	private String name;

	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;
	}
}

User.hbm.xml

引用

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.bjsxt.usermgr.model">
<class name="User" table="t_user">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
</class>
</hibernate-mapping>

LogManager.java

package com.bjsxt.usermgr.manager;

import com.bjsxt.usermgr.model.Log;

public interface LogManager {
	
	public void addLog(Log log);
}

LogManagerImpl.java

package com.bjsxt.usermgr.manager;

import com.bjsxt.usermgr.model.Log;
import com.bjsxt.usermgr.util.HibernateUtils;

public class LogManagerImpl implements LogManager {

	public void addLog(Log log) {
		HibernateUtils.getSessionFactory().getCurrentSession().save(log);
	}

}

UserManager.java

package com.bjsxt.usermgr.manager;

import com.bjsxt.usermgr.model.User;

public interface UserManager {
	
	public void addUser(User user);
}

UserManagerImpl.java

package com.bjsxt.usermgr.manager;

import java.util.Date;

import org.hibernate.Session;

import com.bjsxt.usermgr.model.Log;
import com.bjsxt.usermgr.model.User;
import com.bjsxt.usermgr.util.HibernateUtils;

public class UserManagerImpl implements UserManager {

	public void addUser(User user) {
		Session session = null;
		try {
			//session = HibernateUtils.getSession();
			session = HibernateUtils.getSessionFactory().getCurrentSession();
			session.beginTransaction();
			
			session.save(user);

			Integer.parseInt("asdfsdfsfsd");
			Log log = new Log();
			log.setType("安全日志");
			log.setDetail("xxx进入系统");
			log.setTime(new Date());

			LogManager logManager = new LogManagerImpl();
			logManager.addLog(log);

			session.getTransaction().commit();
		}catch(Exception e) {
			e.printStackTrace();
			session.getTransaction().rollback();
//		}finally {
//			HibernateUtils.closeSession(session);
		}
	}
}

Client.java

package com.bjsxt.usermgr.client;

import com.bjsxt.usermgr.manager.UserManager;
import com.bjsxt.usermgr.manager.UserManagerImpl;
import com.bjsxt.usermgr.model.User;

public class Client {

	public static void main(String[] args) {
		User user = new User();
		user.setName("张三");
		
		UserManager userManager = new UserManagerImpl();
		userManager.addUser(user);
	}
}