groupsdaoimpljdbc.java

解觖java技术中后台无法上传数给的情况

            statement.setTimestamp(3, groupModifiedDate);

            // primary key column(s)
            statement.setInt(4, groupID);

            if (statement.executeUpdate() != 1) {
                throw new ObjectNotFoundException("Cannot update table Groups where primary key = (" + groupID + ").");
            }
            m_dirty = true;
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in GroupsDAOImplJDBC.update.");
        } finally {
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

    /*
     * Included columns: GroupOwnerID, GroupOwnerName, GroupModifiedDate
     * Excluded columns: GroupID, GroupName, GroupDesc, GroupOption, GroupCreationDate
     */
    public void updateOwner(int groupID, // primary key
                            String groupOwnerName, Timestamp groupModifiedDate)
        throws ObjectNotFoundException, DatabaseException, ForeignKeyNotFoundException {

        int groupOwnerID = 0;//MUST init to 0

        //GroupsBean bean = getGroup(groupID); // @todo: comment or delete this line if no alternate key are included

        try {
            // @todo: modify the parameter list as needed
            // If this method does not change the foreign key columns, you can comment this block of code.
            groupOwnerID = 0;
            if ((groupOwnerName!=null) && (groupOwnerName.length()>0)) {// have group owner
                DAOFactory.getMemberDAO().findByAlternateKey_MemberName(groupOwnerName);
                try {
                    groupOwnerID = DAOFactory.getMemberDAO().getMemberIDFromMemberName(groupOwnerName);
                } catch (ObjectNotFoundException ex) {
                    // This exception should never be thrown
                    throw new ObjectNotFoundException("ASSERTION: This should never happen.");
                }
            }
        } catch(ObjectNotFoundException e) {
            throw new ForeignKeyNotFoundException("Foreign key refers to table 'Member' does not exist. Cannot update table 'Groups'.");
        }

        Connection connection = null;
        PreparedStatement statement = null;
        StringBuffer sql = new StringBuffer(512);
        sql.append("UPDATE " + TABLE_NAME + " SET GroupOwnerID = ?, GroupOwnerName = ?, GroupModifiedDate = ?");
        sql.append(" WHERE GroupID = ?");
        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());

            // // column(s) to update
            statement.setInt(1, groupOwnerID);
            statement.setString(2, groupOwnerName);
            statement.setTimestamp(3, groupModifiedDate);

            // primary key column(s)
            statement.setInt(4, groupID);

            if (statement.executeUpdate() != 1) {
                throw new ObjectNotFoundException("Cannot update table Groups where primary key = (" + groupID + ").");
            }
            m_dirty = true;
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in GroupsDAOImplJDBC.updateOwner.");
        } finally {
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

    /*
     * Included columns: GroupOwnerID, GroupOwnerName, GroupName, GroupDesc, GroupOption,
     *                   GroupCreationDate, GroupModifiedDate
     * Excluded columns: GroupID
     */
    public GroupsBean getGroup(int groupID)
        throws ObjectNotFoundException, DatabaseException {

        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        StringBuffer sql = new StringBuffer(512);
        sql.append("SELECT GroupOwnerID, GroupOwnerName, GroupName, GroupDesc, GroupOption, GroupCreationDate, GroupModifiedDate");
        sql.append(" FROM " + TABLE_NAME);
        sql.append(" WHERE GroupID = ?");
        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());
            statement.setInt(1, groupID);
            resultSet = statement.executeQuery();
            if(!resultSet.next()) {
                throw new ObjectNotFoundException("Cannot find the row in table Groups where primary key = (" + groupID + ").");
            }

            GroupsBean bean = new GroupsBean();
            bean.setGroupID(groupID);
            bean.setGroupOwnerID(resultSet.getInt("GroupOwnerID"));
            bean.setGroupOwnerName(resultSet.getString("GroupOwnerName"));
            bean.setGroupName(resultSet.getString("GroupName"));
            bean.setGroupDesc(resultSet.getString("GroupDesc"));
            bean.setGroupOption(resultSet.getInt("GroupOption"));
            bean.setGroupCreationDate(resultSet.getTimestamp("GroupCreationDate"));
            bean.setGroupModifiedDate(resultSet.getTimestamp("GroupModifiedDate"));
            return bean;
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in GroupsDAOImplJDBC.getGroup(pk).");
        } finally {
            DBUtils.closeResultSet(resultSet);
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

    public Collection getMyGroups(int memberID)
        throws DatabaseException {

        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        StringBuffer sql = new StringBuffer(512);
        ArrayList retValue = new ArrayList();
        sql.append("SELECT g.GroupID, g.GroupName, g.GroupDesc, GroupOption, GroupCreationDate, GroupModifiedDate");
        sql.append(" FROM " + TABLE_NAME).append(" g, ").append(MemberGroupDAO.TABLE_NAME).append(" mg");
        sql.append(" WHERE (g.GroupID = mg.GroupID) AND (mg.MemberID = ?)");
        sql.append(" ORDER BY g.GroupID ASC");

        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());
            statement.setInt(1, memberID);
            resultSet = statement.executeQuery();
            while(resultSet.next()) {
                GroupsBean bean = new GroupsBean();
                bean.setGroupID(resultSet.getInt("GroupID"));
                bean.setGroupName(resultSet.getString("GroupName"));
                bean.setGroupDesc(resultSet.getString("GroupDesc"));
                bean.setGroupOption(resultSet.getInt("GroupOption"));
                bean.setGroupCreationDate(resultSet.getTimestamp("GroupCreationDate"));
                bean.setGroupModifiedDate(resultSet.getTimestamp("GroupModifiedDate"));
                retValue.add(bean);
            }
            return retValue;
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in GroupsDAOImplJDBC.getMyGroups(memberID).");
        } finally {
            DBUtils.closeResultSet(resultSet);
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

    /*
     * Included columns: GroupID, GroupOwnerID, GroupOwnerName, GroupName, GroupDesc,
     *                   GroupOption, GroupCreationDate, GroupModifiedDate
     * Excluded columns:
     */
    public Collection getGroups()
        throws DatabaseException {

        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        Collection retValue = new ArrayList();
        StringBuffer sql = new StringBuffer(512);
        sql.append("SELECT GroupID, GroupOwnerID, GroupOwnerName, GroupName, GroupDesc, GroupOption, GroupCreationDate, GroupModifiedDate");
        sql.append(" FROM " + TABLE_NAME);
        //sql.append(" WHERE "); // @todo: uncomment as needed
        //minhnn: @todo: it should be GroupID, not GroupName
        sql.append(" ORDER BY GroupID ASC");// must sort be id to show number of members in group
        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());
            resultSet = statement.executeQuery();
            while (resultSet.next()) {
                GroupsBean bean = new GroupsBean();
                bean.setGroupID(resultSet.getInt("GroupID"));
                bean.setGroupOwnerID(resultSet.getInt("GroupOwnerID"));
                bean.setGroupOwnerName(resultSet.getString("GroupOwnerName"));
                bean.setGroupName(resultSet.getString("GroupName"));
                bean.setGroupDesc(resultSet.getString("GroupDesc"));
                bean.setGroupOption(resultSet.getInt("GroupOption"));
                bean.setGroupCreationDate(resultSet.getTimestamp("GroupCreationDate"));
                bean.setGroupModifiedDate(resultSet.getTimestamp("GroupModifiedDate"));
                retValue.add(bean);
            }
            return retValue;
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in GroupsDAOImplJDBC.getBeans.");
        } finally {
            DBUtils.closeResultSet(resultSet);
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

    public int getNumberOfGroups()
        throws AssertionException, DatabaseException {

        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        StringBuffer sql = new StringBuffer(512);
        sql.append("SELECT Count(*)");
        sql.append(" FROM " + TABLE_NAME);
        //sql.append(" WHERE "); // @todo: uncomment as needed
        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());
            resultSet = statement.executeQuery();
            if (!resultSet.next()) {
                throw new AssertionException("Assertion in GroupsDAOImplJDBC.getNumberOfGroups.");
            }
            return resultSet.getInt(1);
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in GroupsDAOImplJDBC.getNumberOfGroups.");
        } finally {
            DBUtils.closeResultSet(resultSet);
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

/************************************************
 * Customized methods come below
 ************************************************/

    /* @todo check if this method work with other DBMS other than MySql (check case-sensitive) */
    public int getGroupIDFromGroupName(String groupName)
        throws ObjectNotFoundException, DatabaseException {

        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        String sql = "SELECT GroupID FROM " + TABLE_NAME + " WHERE GroupName = ?";
        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql);
            statement.setString(1, groupName);
            resultSet = statement.executeQuery();
            if(!resultSet.next()) {
                throw new ObjectNotFoundException("Cannot find the row in table Group where GroupName = " + groupName);
            }
            return resultSet.getInt(1);
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in GroupsDAOImplJDBC.getGroupIDFromGroupName.");
        } finally {
            DBUtils.closeResultSet(resultSet);
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

}// end of class GroupsDAOImplJDBC