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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/CompiledStatement.java @ 372:fc3cf0ef777e

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Added meta data service. flys-artifacts/trunk@1781 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 29 Apr 2011 15:10:44 +0000
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children c09c9e05ecfa
rev   line source
372
fc3cf0ef777e Added meta data service.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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1 package de.intevation.flys.artifacts.services.meta;
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2
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3 import java.util.regex.Pattern;
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4 import java.util.regex.Matcher;
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5
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6 import java.util.List;
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7 import java.util.Map;
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8 import java.util.HashMap;
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9 import java.util.ArrayList;
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10
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11 import java.sql.PreparedStatement;
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12 import java.sql.SQLException;
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13 import java.sql.Connection;
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14 import java.sql.ResultSet;
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15
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16 public class CompiledStatement
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17 {
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18 public static final Pattern VAR = Pattern.compile("\\$\\{([a-zA-Z0-9_]+)\\}");
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19
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20 protected String original;
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21 protected String statement;
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22
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23 protected Map<String, List<Integer>> positions;
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24
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25 protected PreparedStatement preparedStatement;
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26
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27 public CompiledStatement() {
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28 }
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29
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30 public CompiledStatement(String original) {
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31 this.original = original;
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32 positions = new HashMap<String, List<Integer>>();
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33 compile();
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34 }
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35
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36 protected void compile() {
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37
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38 StringBuffer sb = new StringBuffer();
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39
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40 Matcher m = VAR.matcher(original);
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41
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42 int index = 1;
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43
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44 while (m.find()) {
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45 String key = m.group(1);
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46 List<Integer> indices = positions.get(key);
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47 if (indices == null) {
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48 indices = new ArrayList<Integer>();
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49 positions.put(key, indices);
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50 }
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51 indices.add(index);
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52 m.appendReplacement(sb, "?");
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53 ++index;
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54 }
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55
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56 m.appendTail(sb);
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57
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58 statement = sb.toString();
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59 }
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60
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61 public String getStatement() {
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62 return statement;
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63 }
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64
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65 public ResultData execute(Connection connection, StackFrames frames)
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66 throws SQLException
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67 {
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68 if (preparedStatement == null) {
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69 preparedStatement = connection.prepareStatement(statement);
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70 }
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71
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72 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) {
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73 Object value = frames.get(entry.getKey());
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74 for (Integer index: entry.getValue()) {
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75 preparedStatement.setObject(index, value);
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76 }
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77 }
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78
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79 ResultSet result = preparedStatement.executeQuery();
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80 try {
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81 return new ResultData(preparedStatement.getMetaData())
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82 .addAll(result);
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83 }
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84 finally {
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85 result.close();
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86 }
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87 }
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88
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89 public void close() {
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90 if (preparedStatement != null) {
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91 try {
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92 preparedStatement.close();
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93 }
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94 catch (SQLException sqle) {
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95 }
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96 preparedStatement = null;
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97 }
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98 }
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99 }
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100 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org