Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/DefaultQueryExceutor.java @ 887:b757def3ff55

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Bring @author javadoc tags in form '@author <a href="john.doe@example.com">John Doe</a>' geo-backend/trunk@859 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 29 Mar 2010 09:45:05 +0000
parents 8b442223741c
children d387a97807a3
rev   line source
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1 package de.intevation.gnv.geobackend.base.query;
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2
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3 import de.intevation.gnv.geobackend.base.Result;
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4
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5 import de.intevation.gnv.geobackend.base.connectionpool.ConnectionPool;
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6 import de.intevation.gnv.geobackend.base.connectionpool.ConnectionPoolFactory;
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7
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8 import de.intevation.gnv.geobackend.base.connectionpool.exception.ConnectionException;
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9
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10 import de.intevation.gnv.geobackend.base.query.container.QueryContainerFactory;
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11
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12 import de.intevation.gnv.geobackend.base.query.container.exception.QueryContainerException;
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13
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14 import de.intevation.gnv.geobackend.base.query.exception.QueryException;
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16 import java.sql.Connection;
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17 import java.sql.ResultSet;
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18 import java.sql.SQLException;
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19 import java.sql.Statement;
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21 import java.util.Collection;
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22
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23 import org.apache.log4j.Logger;
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24
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25 /**
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26 * This is an Standard Implementation of the Interface QueryExecutor.
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27 * It fetchs the Query from the Querycontainer an put the Filtervalues into the Query.
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28 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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29 *
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30 */
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31 public class DefaultQueryExceutor extends QueryExecutorBase{
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32
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34 /**
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35 * the logger, used to log exceptions and additonaly information
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36 */
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37 private static Logger log = Logger.getLogger(DefaultQueryExceutor.class);
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39 /**
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40 * The ConnectionID identifing the Connection to use executing the Query.
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41 */
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42 private String connectionID = "N/N";
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44 /**
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45 * Constructor
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46 */
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47 public DefaultQueryExceutor() {
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48 super();
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49 }
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50
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51 /**
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52 * @see de.intevation.gnv.geobackend.base.query.QueryExecutor#executeQuery(java.lang.String, java.lang.String[])
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53 */
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54 public Collection<Result> executeQuery(String queryID, String[] filter) throws QueryException {
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55 Collection<Result> returnValue = null;
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56 try {
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57 String queryString = QueryContainerFactory.getInstance().getQueryContainer().getQuery(queryID);
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58 if (queryString != null){
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59 if (filter != null && filter.length > 0){
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60 //Insert the Filtervalues into the QueryString
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61 queryString = super.setFilterValues(queryString, filter);
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62 }
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63
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64 if (log.isDebugEnabled()) {
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65 log.debug("############ QUERY ##################");
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66 log.debug(queryString);
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67 log.debug("#######################################");
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68 }
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69
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70 returnValue = cachedResults(queryString);
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71
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72 if (returnValue != null) {
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73 return returnValue;
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74 }
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75
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76 Connection connection = null;
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77 ConnectionPool connectionPool = ConnectionPoolFactory.getInstance().getConnectionPool();
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78 try {
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79 // Submit the Query
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80 connection = connectionPool.getConnection(this.connectionID);
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81 if (connection != null){
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82 Statement stmt = connection.createStatement();
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83 ResultSet rs = stmt.executeQuery(queryString);
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84 returnValue = super.createResultCollection(rs);
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86 }else{
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87 log.error("Could not establish Databaseconnection.");
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88 throw new QueryException("Could not establish Databaseconnection.");
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89 }
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90
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91 cacheResults(queryString, returnValue);
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93 } catch (ConnectionException e) {
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94 log.error(e,e);
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95 throw new QueryException("Could not establish Databaseconnection.",e);
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96 } catch (SQLException e) {
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97 log.error(e,e);
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98 throw new QueryException(e);
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99 }finally{
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100 if (connection != null){
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101 try {
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102 connectionPool.closeConnection(connection);
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103 } catch (ConnectionException e) {
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104 log.error("Connection could not be returned to ConnectionPool.");
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105 log.error(e,e);
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106 }
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107 }
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108 }
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109 }else{
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110 log.error("No QueryString defined for "+queryID);
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111 throw new QueryException("Cannot get the Querystring");
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112 }
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113
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114 } catch (QueryContainerException e) {
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115 log.error(e,e);
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116 throw new QueryException("Cannot get the Querystring",e);
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117 }
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118
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119 return returnValue;
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120 }
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121 }
http://dive4elements.wald.intevation.org