Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/QueryExecutorBase.java @ 895:eb777022b628

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Integrated a CacheCleaner that will cleanup the SQL-Cache if necessary geo-backend/trunk@958 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Tue, 20 Apr 2010 12:42:17 +0000
parents b757def3ff55
children ebeb56428409
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 java.sql.ResultSet;
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4 import java.sql.ResultSetMetaData;
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5 import java.sql.SQLException;
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6 import java.util.ArrayList;
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7 import java.util.Collection;
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8 import java.util.List;
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10 import de.intevation.gnv.geobackend.base.DefaultResult;
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11 import de.intevation.gnv.geobackend.base.DefaultResultDescriptor;
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12 import de.intevation.gnv.geobackend.base.Result;
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13 import de.intevation.gnv.geobackend.base.ResultDescriptor;
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14
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15 /**
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16 * This is an abstract Basicimplementation of the Interface
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17 * QueryExecutor providing several Helpermethods.
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18 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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19 *
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20 */
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21 public abstract class QueryExecutorBase implements QueryExecutor {
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22
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23 /**
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24 * Constructor
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25 */
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26 public QueryExecutorBase() {
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27 super();
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28 }
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30 /**
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31 * This Method puts the Filtervalues into the Querystring
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32 * @param queryString the Query which should be manipulated
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33 * @param filter the values which should be put into the Query
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34 * @return the manipulated Query
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35 */
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36 protected String setFilterValues(String queryString, String[] filter){
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37 String returnValue = queryString;
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38 for (int i = 0; i < filter.length; i++){
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39 returnValue = returnValue.replaceFirst("[?]", filter[i]);
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40 }
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41 return returnValue;
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42 }
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44 /**
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45 * This Methods converts the ResultSet into an Collection of Result-objects
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46 * @param resultSet the ResultSet which should be converted
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47 * @return an Collection containing Result-Objects
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48 * @throws SQLException
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49 */
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50 protected Collection<Result> createResultCollection(ResultSet resultSet) throws SQLException{
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51 Collection<Result> returnValue = new ArrayList<Result>();
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53 ResultDescriptor resultDescriptor = null;
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54 int columns = -1;
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56 List<String> columnNames = null;
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58 while (resultSet.next()){
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59 if (resultDescriptor == null){
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60 resultDescriptor = new DefaultResultDescriptor();
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61 ResultSetMetaData rsmd = resultSet.getMetaData();
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62 columns = rsmd.getColumnCount();
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64 for (int i = 1; i <= columns; i++){
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65 resultDescriptor.addColumn(rsmd.getColumnName(i), rsmd.getColumnClassName(i));
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66 }
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67 }
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69 Result result = convertResult(resultSet, resultDescriptor);
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71 returnValue.add(result);
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72 }
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73 return returnValue;
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74 }
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76 /**
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77 * This Method converts one Singel ResultSetEntry into an Result-Object
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78 * @param resultSet the ResultSet where the Entry should be took from.
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79 * @param resultDescriptor the ResultsetDescriptor which describes the Entry
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80 * @return an new Result-Objects containing the Values of the ResultSet-Entry
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81 * @throws SQLException
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82 */
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83 private Result convertResult(ResultSet resultSet, ResultDescriptor resultDescriptor)
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84 throws SQLException {
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86 Result result = new DefaultResult(resultDescriptor);
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87
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88 for (int i = 0, N = resultDescriptor.getColumnCount(); i < N; i++) {
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89 result.addColumnValue(i, resultSet.getObject(i+1));
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90 }
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91 return result;
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92 }
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94 public Collection<Result> cachedResults(String query) {
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95 return null;
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96 }
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97
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98 public void cacheResults(String query, Collection<Result> result) {
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99 }
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101 public void clearCache(String[] tableNames) {
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102 }
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104 }
http://dive4elements.wald.intevation.org