Source Code Cross Referenced for ManagerBase.java in  » Portal » DLOG4J » dlog4j » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Portal » DLOG4J » dlog4j 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  This program is free software; you can redistribute it and/or modify
003:         *  it under the terms of the GNU General Public License as published by
004:         *  the Free Software Foundation; either version 2 of the License, or
005:         *  (at your option) any later version.
006:         *
007:         *  This program is distributed in the hope that it will be useful,
008:         *  but WITHOUT ANY WARRANTY; without even the implied warranty of
009:         *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
010:         *  GNU Library General Public License for more details.
011:         *
012:         *  You should have received a copy of the GNU General Public License
013:         *  along with this program; if not, write to the Free Software
014:         *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
015:         */
016:        package dlog4j;
017:
018:        import java.sql.Connection;
019:        import java.sql.ResultSet;
020:        import java.sql.SQLException;
021:        import java.sql.Statement;
022:
023:        import javax.servlet.ServletContext;
024:        import javax.sql.DataSource;
025:
026:        import net.sf.hibernate.HibernateException;
027:        import net.sf.hibernate.Session;
028:        import net.sf.hibernate.SessionFactory;
029:
030:        /**
031:         * 所有Manager类的基类,用于封装所有访问Hibernate以及数据库的方法
032:         * 该了在DlogActionServlet的init过程中被初始化
033:         * @author Liudong
034:         */
035:        public class ManagerBase {
036:
037:            private static ServletContext context;
038:
039:            protected static void init(ServletContext servletContext) {
040:                if (servletContext != null)
041:                    context = servletContext;
042:            }
043:
044:            /**
045:             * 获取Hibernate持久层的操作实例
046:             * @return
047:             */
048:            public static Session getSession() throws SQLException {
049:                SessionFactory sessions = (SessionFactory) context
050:                        .getAttribute(dlog4j.Globals.HIBERNATE_SESSIONS_KEY);
051:                return sessions.openSession(getConnection());
052:            }
053:
054:            /**
055:             * 获取到数据库的连接句柄
056:             * @return
057:             * @throws SQLException
058:             */
059:            public static Connection getConnection() throws SQLException {
060:                DataSource dataSource = (DataSource) context
061:                        .getAttribute(org.apache.struts.Globals.DATA_SOURCE_KEY);
062:                return dataSource.getConnection();
063:            }
064:
065:            /**
066:             * 提交Hibernate操作
067:             * @param session
068:             * @throws SQLException
069:             * @throws HibernateException
070:             */
071:            public static void commitSession(Session session, boolean close)
072:                    throws SQLException, HibernateException {
073:                session.flush();
074:                session.connection().commit();
075:                if (close) {
076:                    session.connection().close();
077:                    session.close();
078:                }
079:            }
080:
081:            /**
082:             * 关闭session
083:             * @param session
084:             * @throws SQLException
085:             * @throws HibernateException
086:             */
087:            public static void closeSession(Session session)
088:                    throws SQLException, HibernateException {
089:                session.connection().close();
090:                session.close();
091:            }
092:
093:            public static void close(Object obj1, Object obj2, Object obj3) {
094:                close(obj1);
095:                close(obj2);
096:                close(obj3);
097:            }
098:
099:            /**
100:             * 资源释放
101:             * @param obj
102:             */
103:            public static void close(Object obj) {
104:                if (obj == null)
105:                    return;
106:                try {
107:                    if (obj instanceof  Connection)
108:                        ((Connection) obj).close();
109:                    if (obj instanceof  Statement)
110:                        ((Statement) obj).close();
111:                    if (obj instanceof  ResultSet)
112:                        ((ResultSet) obj).close();
113:                    if (obj instanceof  Session)
114:                        closeSession((Session) obj);
115:                } catch (Exception e) {
116:                }
117:                obj = null;
118:            }
119:
120:        }
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