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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/SQLExecutor.java @ 174:25d472a67a9f

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Reduce the code repetition and the complexity of the backend. artifacts/trunk@1400 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 04 Mar 2011 16:43:03 +0000
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1 /*
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2 * Copyright (c) 2011 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8 package de.intevation.artifactdatabase;
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9
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10 import java.sql.Connection;
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11 import java.sql.PreparedStatement;
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12 import java.sql.ResultSet;
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13 import java.sql.SQLException;
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14
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15 import javax.sql.DataSource;
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16
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17 import org.apache.log4j.Logger;
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18
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19 public class SQLExecutor {
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20
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21 private static Logger logger = Logger.getLogger(SQLExecutor.class);
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22
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23 public Connection conn;
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24 public PreparedStatement stmnt;
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25 public ResultSet result;
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26
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27 public SQLExecutor() {
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28 }
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29
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30 public void reset() throws SQLException {
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31 if (result != null) {
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32 result.close();
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33 result = null;
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34 }
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35 if (stmnt != null) {
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36 result = null;
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37 stmnt.close();
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38 }
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39 }
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40
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41 public PreparedStatement prepareStatement(String query)
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42 throws SQLException {
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43 return stmnt = conn.prepareStatement(query);
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44 }
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45
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46 public void close() {
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47 if (result != null) {
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48 try { result.close(); }
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49 catch (SQLException sqle) {}
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50 }
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51 if (stmnt != null) {
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52 try { stmnt.close(); }
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53 catch (SQLException sqle) {}
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54 }
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55 if (conn != null) {
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56 try { conn.close(); }
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57 catch (SQLException sqle) {}
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58 }
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59 }
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60
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61 public boolean runWrite() {
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62 DataSource dataSource = DBConnection.getDataSource();
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63 try {
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64 conn = dataSource.getConnection();
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65 try {
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66 conn.setAutoCommit(false);
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67 return doIt();
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68 }
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69 catch (SQLException sqle) {
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70 conn.rollback();
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71 throw sqle;
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72 }
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73 }
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74 catch (SQLException sqle) {
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75 logger.error(sqle.getLocalizedMessage(), sqle);
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76 }
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77 finally {
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78 close();
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79 }
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80 return false;
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81 }
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82
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83 public boolean runRead() {
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84 DataSource dataSource = DBConnection.getDataSource();
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85 try {
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86 conn = dataSource.getConnection();
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87 return doIt();
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88 }
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89 catch (SQLException sqle) {
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90 logger.error(sqle.getLocalizedMessage(), sqle);
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91 }
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92 finally {
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93 close();
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94 }
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95 return false;
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96 }
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97
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98 public boolean doIt() throws SQLException {
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99 return true;
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100 }
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101 }
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102 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org