membergroupdaoimpljdbc.java

解觖java技术中后台无法上传数给的情况

        Connection connection = null;
        PreparedStatement statement = null;
        StringBuffer sql = new StringBuffer(512);
        sql.append("DELETE 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);
            if (statement.executeUpdate() != 1) {
                throw new ObjectNotFoundException("Cannot delete a row in table MemberGroup where primary key = (" + groupID + ", " + memberID + ").");
            }
            m_dirty = true;
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in MemberGroupDAOImplJDBC.delete.");
        } finally {
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

    public void delete_inGroup(int groupID)
        throws DatabaseException {

        Connection connection = null;
        PreparedStatement statement = null;
        StringBuffer sql = new StringBuffer(512);
        sql.append("DELETE FROM " + TABLE_NAME);
        sql.append(" WHERE GroupID = ?");

        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());
            statement.setInt(1, groupID);

            statement.executeUpdate();
            m_dirty = true;
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in MemberGroupDAOImplJDBC.delete_inGroup.");
        } finally {
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

    public void delete_inMember(int memberID)
        throws DatabaseException {

        Connection connection = null;
        PreparedStatement statement = null;
        StringBuffer sql = new StringBuffer(512);
        sql.append("DELETE FROM " + TABLE_NAME);
        sql.append(" WHERE MemberID = ?");

        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());
            statement.setInt(1, memberID);

            statement.executeUpdate();
            m_dirty = true;
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in MemberGroupDAOImplJDBC.delete_inMember.");
        } finally {
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

/************************************************
 * Customized methods come below
 ************************************************/
    /*
     * Included columns: MemberID, MemberName, Privilege, CreationDate, ModifiedDate
     * Excluded columns: GroupID
     */
    public Collection getBeans_inGroup(int groupID)
        throws DatabaseException {

        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        Collection retValue = new ArrayList();
        StringBuffer sql = new StringBuffer(512);
        sql.append("SELECT MemberID, MemberName, Privilege, CreationDate, ModifiedDate");
        sql.append(" FROM " + TABLE_NAME);
        sql.append(" WHERE GroupID = ?");
        sql.append(" ORDER BY MemberID ASC ");
        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());
            statement.setInt(1, groupID);
            resultSet = statement.executeQuery();
            while (resultSet.next()) {
                MemberGroupBean bean = new MemberGroupBean();
                bean.setGroupID(groupID);
                bean.setMemberID(resultSet.getInt("MemberID"));
                bean.setMemberName(resultSet.getString("MemberName"));
                bean.setPrivilege(resultSet.getInt("Privilege"));
                bean.setCreationDate(resultSet.getTimestamp("CreationDate"));
                bean.setModifiedDate(resultSet.getTimestamp("ModifiedDate"));
                retValue.add(bean);
            }
            return retValue;
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in MemberGroupDAOImplJDBC.getBeans_inGroup.");
        } finally {
            DBUtils.closeResultSet(resultSet);
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

    public int getNumberOfBeans_inGroup(int groupID)
        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 GroupID = ?");
        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());
            statement.setInt(1, groupID);
            resultSet = statement.executeQuery();
            if (!resultSet.next()) {
                throw new AssertionException("Assertion in MemberGroupDAOImplJDBC.getNumberOfBeans_inGroup.");
            }
            return resultSet.getInt(1);
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in MemberGroupDAOImplJDBC.getNumberOfBeans_inGroup.");
        } finally {
            DBUtils.closeResultSet(resultSet);
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

    /*
     * Included columns: GroupID, MemberID, MemberName, Privilege, CreationDate,
     *                   ModifiedDate
     * Excluded columns:
     */
    // huumai: only support MySQL
    //@todo: check if need support for other database???
    public Collection getBeans_limit(int groupID, int offset, int rowsToReturn)
        throws IllegalArgumentException, DatabaseException {
        if (offset < 0) throw new IllegalArgumentException("The offset < 0 is not allowed.");
        if (rowsToReturn <= 0) throw new IllegalArgumentException("The rowsToReturn <= 0 is not allowed.");

        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        Collection retValue = new ArrayList();
        StringBuffer sql = new StringBuffer(512);
        sql.append("SELECT GroupID, MemberID, MemberName, Privilege, CreationDate, ModifiedDate");
        sql.append(" FROM " + TABLE_NAME);
        sql.append(" WHERE GroupID = ?"); // @todo: uncomment as needed
        //sql.append(" ORDER BY ColumnName ASC|DESC "); // @todo: uncomment as needed
        sql.append(" LIMIT ?, ?");
        try {
            connection = DBUtils.getConnection();
            statement = connection.prepareStatement(sql.toString());
            statement.setInt(1, groupID);
            statement.setInt(2, offset);
            statement.setInt(3, rowsToReturn);
            resultSet = statement.executeQuery();
            while (resultSet.next()) {
                MemberGroupBean bean = new MemberGroupBean();
                bean.setGroupID(resultSet.getInt("GroupID"));
                bean.setMemberID(resultSet.getInt("MemberID"));
                bean.setMemberName(resultSet.getString("MemberName"));
                bean.setPrivilege(resultSet.getInt("Privilege"));
                bean.setCreationDate(resultSet.getTimestamp("CreationDate"));
                bean.setModifiedDate(resultSet.getTimestamp("ModifiedDate"));
                retValue.add(bean);
            }
            return retValue;
        } catch(SQLException sqle) {
            log.error("Sql Execution Error!", sqle);
            throw new DatabaseException("Error executing SQL in MemberGroupDAOImplJDBC.getBeans_limit.");
        } finally {
            DBUtils.closeResultSet(resultSet);
            DBUtils.closeStatement(statement);
            DBUtils.closeConnection(connection);
        }
    }

}// end of class MemberGroupDAOImplJDBC