| /* |
| * Copyright 1999-2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.cocoon.components.language.markup.xsp; |
| |
| import java.sql.PreparedStatement; |
| import java.sql.SQLException; |
| import java.sql.ResultSet; |
| import java.sql.CallableStatement; |
| import java.sql.Connection; |
| |
| /** |
| * This EsqlQuery only uses the standard JDBC API approaches. |
| * Please note that whether this is good, ok or bad depends |
| * on the driver implementation of your database vendor. |
| * It should work with all JDBC compliant databases. |
| * Unfortunately it seems NOT to work with mssql |
| * |
| * @author <a href="mailto:tcurdt@apache.org">Torsten Curdt</a> |
| * @version CVS $Id: JdbcEsqlQuery.java,v 1.6 2004/03/05 13:01:53 bdelacretaz Exp $ |
| */ |
| final public class JdbcEsqlQuery extends AbstractEsqlQuery { |
| |
| public JdbcEsqlQuery(Connection connection, String query) { |
| super(connection, query); |
| } |
| |
| /** |
| * Only newInstance may use this contructor |
| * @param resultSet |
| */ |
| private JdbcEsqlQuery(final ResultSet resultSet) { |
| super(resultSet); |
| } |
| |
| /** |
| * Create a EsqlQuery of the same type |
| * @param resultSet |
| */ |
| public AbstractEsqlQuery newInstance(final ResultSet resultSet) { |
| return(new JdbcEsqlQuery(resultSet)); |
| } |
| |
| public PreparedStatement prepareStatement() throws SQLException { |
| return ( |
| setPreparedStatement( |
| getConnection().prepareStatement( |
| getQueryString(), |
| ResultSet.TYPE_SCROLL_INSENSITIVE, |
| ResultSet.CONCUR_READ_ONLY) |
| )); |
| } |
| |
| public CallableStatement prepareCall() throws SQLException { |
| return ( |
| (CallableStatement) setPreparedStatement( |
| getConnection().prepareCall( |
| getQueryString(), |
| ResultSet.TYPE_SCROLL_INSENSITIVE, |
| ResultSet.CONCUR_READ_ONLY |
| ) |
| ) |
| ); |
| } |
| |
| /** |
| * AFAIK this is the proposed JDBC API way to get the number |
| * of results. Unfortunately -at least some- driver implementation |
| * are transfering the complete resultset when moving to the end. |
| * Which is totally stupid for limit/paging purposes. So we probably |
| * better stick with an additional count query from the AbstractEsqlQuery |
| */ |
| |
| public int getRowCount() throws SQLException { |
| ResultSet rs = getResultSet(); |
| synchronized (rs) { |
| int currentRow = rs.getRow(); |
| rs.last(); |
| int count = rs.getRow(); |
| if (currentRow > 0) { |
| rs.absolute(currentRow); |
| } |
| else { |
| rs.first(); |
| rs.relative(-1); |
| } |
| return (count); |
| } |
| } |
| |
| public void getResultRows() throws SQLException { |
| final int skip = getSkipRows(); |
| if (skip > 0) { |
| getResultSet().absolute(skip); |
| } |
| setPosition(skip); |
| } |
| |
| } |