membergroupdaoimpljdbc.java

解觖java技术中后台无法上传数给的情况

/*
 * $Header: /cvsroot/mvnforum/mvnforum/src/com/mvnforum/db/jdbc/MemberGroupDAOImplJDBC.java,v 1.13 2006/04/14 17:05:26 minhnn Exp $
 * $Author: minhnn $
 * $Revision: 1.13 $
 * $Date: 2006/04/14 17:05:26 $
 *
 * ====================================================================
 *
 * Copyright (C) 2002-2006 by MyVietnam.net
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 * All copyright notices regarding mvnForum MUST remain 
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 * the footer of the pages MUST remain visible when the pages
 * are viewed on the internet or intranet.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
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 * @author: Minh Nguyen  
 * @author: Mai  Nguyen  
 */
package com.mvnforum.db.jdbc;

import java.sql.*;
import java.util.ArrayList;
import java.util.Collection;

import com.mvnforum.db.*;
import net.myvietnam.mvncore.db.DBUtils;
import net.myvietnam.mvncore.exception.*;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class MemberGroupDAOImplJDBC implements MemberGroupDAO {

    private static Log log = LogFactory.getLog(MemberGroupDAOImplJDBC.class);

    // this variable will support caching if cache for this class is needed
    private static boolean m_dirty = true;

    public MemberGroupDAOImplJDBC() {
    }

    protected static boolean isDirty() {
        return m_dirty;
    }

    protected static void setDirty(boolean dirty) {
        m_dirty = dirty;
    }

    public void findByPrimaryKey(int groupID, int memberID)
        throws ObjectNotFoundException, DatabaseException {

        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        StringBuffer sql = new StringBuffer(512);
        sql.append("SELECT GroupID, MemberID");
        sql.append(" FROM " + TABLE_NAME);
        sql.append(" WHERE GroupID = ? AND MemberID = ?");
        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());
            statement.setInt(1, groupID);
            statement.setInt(2, memberID);
            resultSet = statement.executeQuery();
            if (!resultSet.next()) {
                throw new ObjectNotFoundException("Cannot find the primary key (" + groupID + ", " + memberID + ") in table 'MemberGroup'.");
            }
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in MemberGroupDAOImplJDBC.findByPrimaryKey.");
        } finally {
            DBUtils.closeResultSet(resultSet);
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

    public void isTutor(int memberID)
        throws ObjectNotFoundException, DatabaseException {

        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        StringBuffer sql = new StringBuffer(512);

        sql.append(" SELECT * FROM " + TABLE_NAME + " membergroup , " + GroupsDAO.TABLE_NAME + " groups ");
        sql.append(" WHERE membergroup.GroupID = groups.GroupID");
        sql.append(" AND membergroup.MemberID = ?");
        sql.append(" AND groups.GroupName = ?");
        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());
            statement.setInt(1, memberID);
            statement.setString(2, GroupsDAO.TUTOR_GROUP_NAME);
            resultSet = statement.executeQuery();
            if (!resultSet.next()) {
                throw new ObjectNotFoundException("Cannot find the primary key (" + memberID + ") in table 'MemberGroup'.");
            }
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in MemberGroupDAOImplJDBC.isTutor.");
        } finally {
            DBUtils.closeResultSet(resultSet);
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

    /*
     * Included columns: GroupID, MemberID, MemberName, Privilege, CreationDate,
     *                   ModifiedDate
     * Excluded columns:
     */
    public void create(int groupID, String memberName,
                       int privilege, Timestamp creationDate, Timestamp modifiedDate)
        throws CreateException, DatabaseException, DuplicateKeyException, ForeignKeyNotFoundException {

        int memberID = 0;
        try {
            // @todo: modify the parameter list as needed
            // You may have to regenerate this method if the needed columns dont have attribute 'include'
            DAOFactory.getMemberDAO().findByAlternateKey_MemberName(memberName);//redundant ???
            memberID = DAOFactory.getMemberDAO().getMemberIDFromMemberName(memberName);
        } catch(ObjectNotFoundException e) {
            throw new ForeignKeyNotFoundException("Foreign key refers to table 'Member' does not exist. Cannot create new MemberGroup.");
        }

        // @todo: comment this try-catch block if the needed columns dont have attribute 'include'
        // If this is the case, then it is highly recommended that you regenerate this method with the attribute 'include' turned on
        // However, if primary key is a auto_increament column, then you can safely delete this block
        try {
            //Check if primary key already exists
            findByPrimaryKey(groupID, memberID);
            //If so, then we have to throw an exception
            throw new DuplicateKeyException("Primary key already exists. Cannot create new MemberGroup with the same [GroupID, MemberID] (" + groupID + ", " + memberID + ").");
        } catch(ObjectNotFoundException e) {
            //Otherwise we can go ahead
        }

        try {
            // @todo: modify the parameter list as needed
            // You may have to regenerate this method if the needed columns dont have attribute 'include'
            DAOFactory.getGroupsDAO().findByPrimaryKey(groupID);
        } catch(ObjectNotFoundException e) {
            throw new ForeignKeyNotFoundException("Foreign key refers to table 'Groups' does not exist. Cannot create new MemberGroup.");
        }

        Connection connection = null;
        PreparedStatement statement = null;
        StringBuffer sql = new StringBuffer(512);
        sql.append("INSERT INTO " + TABLE_NAME + " (GroupID, MemberID, MemberName, Privilege, CreationDate, ModifiedDate)");
        sql.append(" VALUES (?, ?, ?, ?, ?, ?)");
        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());

            statement.setInt(1, groupID);
            statement.setInt(2, memberID);
            statement.setString(3, memberName);
            statement.setInt(4, privilege);
            statement.setTimestamp(5, creationDate);
            statement.setTimestamp(6, modifiedDate);

            if (statement.executeUpdate() != 1) {
                throw new CreateException("Error adding a row into table 'MemberGroup'.");
            }
            m_dirty = true;
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in MemberGroupDAOImplJDBC.create.");
        } finally {
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

    public void delete(int groupID, int memberID)
        throws DatabaseException, ObjectNotFoundException {