Java tutorial
/* $Id$ */ /* * ProgramSymbolSqlAdapter.java * * Network Embedded Sensor Testbed (NESTbed) * * Copyright (C) 2006-2007 * Dependable Systems Research Group * School of Computing * Clemson University * Andrew R. Dalton and Jason O. Hallstrom * * 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 (at your option) 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. * 51 Franklin Street, Fifth Floor * Boston, MA 02110-1301, USA. */ package edu.clemson.cs.nestbed.server.adaptation.sql; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; import java.sql.SQLException; import java.util.Date; import java.util.HashMap; import java.util.Map; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import edu.clemson.cs.nestbed.common.model.ProgramSymbol; import edu.clemson.cs.nestbed.server.adaptation.AdaptationException; import edu.clemson.cs.nestbed.server.adaptation.ProgramSymbolAdapter; public class ProgramSymbolSqlAdapter extends SqlAdapter implements ProgramSymbolAdapter { private final static Log log = LogFactory.getLog(ProgramSymbolSqlAdapter.class); private enum Index { ID, PROGID, MODULE, SYMBOL, ADDRESS, SIZE, TIMESTAMP; public int index() { return ordinal() + 1; } } public Map<Integer, ProgramSymbol> readProgramSymbols() throws AdaptationException { Map<Integer, ProgramSymbol> programSymbols = new HashMap<Integer, ProgramSymbol>(); Connection connection = null; Statement statement = null; ResultSet resultSet = null; try { String query = "SELECT * FROM ProgramSymbols"; connection = DriverManager.getConnection(CONN_STR); statement = connection.createStatement(); resultSet = statement.executeQuery(query); while (resultSet.next()) { ProgramSymbol programSymbol = getProgramSymbol(resultSet); programSymbols.put(programSymbol.getID(), programSymbol); } } catch (SQLException ex) { String msg = "SQLException in readProgramSymbols"; log.error(msg, ex); throw new AdaptationException(msg, ex); } finally { try { resultSet.close(); } catch (Exception ex) { } try { statement.close(); } catch (Exception ex) { } try { connection.close(); } catch (Exception ex) { } } return programSymbols; } public ProgramSymbol createNewProgramSymbol(int programID, String module, String symbol, int address, int size) throws AdaptationException { ProgramSymbol programSymbol = null; Connection connection = null; Statement statement = null; ResultSet resultSet = null; try { String query = "INSERT INTO ProgramSymbols " + "(programID, module, symbol, address, size)" + " VALUES (" + programID + ", '" + module + "', '" + symbol + "', " + address + ", " + size + ")"; connection = DriverManager.getConnection(CONN_STR); statement = connection.createStatement(); statement.executeUpdate(query); query = "SELECT * FROM ProgramSymbols WHERE " + "programID = " + programID + " AND " + "module = '" + module + "' AND " + "symbol = '" + symbol + "'"; resultSet = statement.executeQuery(query); if (!resultSet.next()) { connection.rollback(); String msg = "Attempt to create program symbol failed."; log.error(msg); throw new AdaptationException(msg); } programSymbol = getProgramSymbol(resultSet); connection.commit(); } catch (SQLException ex) { try { connection.rollback(); } catch (Exception e) { } String msg = "SQLException in createNewProgramSymbol"; log.error(msg, ex); throw new AdaptationException(msg, ex); } finally { try { resultSet.close(); } catch (Exception ex) { } try { statement.close(); } catch (Exception ex) { } try { connection.close(); } catch (Exception ex) { } } return programSymbol; } public ProgramSymbol deleteProgramSymbol(int id) throws AdaptationException { ProgramSymbol programSymbol = null; Connection connection = null; Statement statement = null; ResultSet resultSet = null; try { String query = "SELECT * FROM ProgramSymbols " + "WHERE id = " + id; connection = DriverManager.getConnection(CONN_STR); statement = connection.createStatement(); resultSet = statement.executeQuery(query); if (!resultSet.next()) { connection.rollback(); String msg = "Attempt to delete program symbol failed."; log.error(msg); throw new AdaptationException(msg); } programSymbol = getProgramSymbol(resultSet); query = "DELETE FROM ProgramSymbols " + "WHERE id = " + id; statement.executeUpdate(query); connection.commit(); } catch (SQLException ex) { try { connection.rollback(); } catch (Exception e) { } String msg = "SQLException in deleteProgramSymbol"; log.error(msg, ex); throw new AdaptationException(msg, ex); } finally { try { resultSet.close(); } catch (Exception ex) { } try { statement.close(); } catch (Exception ex) { } try { connection.close(); } catch (Exception ex) { } } return programSymbol; } private final ProgramSymbol getProgramSymbol(ResultSet resultSet) throws SQLException { int id = resultSet.getInt(Index.ID.index()); int programID = resultSet.getInt(Index.PROGID.index()); String module = resultSet.getString(Index.MODULE.index()); String symbol = resultSet.getString(Index.SYMBOL.index()); int address = resultSet.getInt(Index.ADDRESS.index()); short size = resultSet.getShort(Index.SIZE.index()); Date timestamp = resultSet.getDate(Index.TIMESTAMP.index()); return new ProgramSymbol(id, programID, module, symbol, address, size, timestamp); } }