Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/CompiledStatement.java @ 4805:722b4962e30e
Comment/doc.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 16 Jan 2013 11:38:06 +0100 |
parents | c1df0dac140b |
children | ad9f1bdd51ba |
rev | line source |
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Datacage: Moved templating in a better suited package.
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1 package de.intevation.flys.artifacts.datacage.templating; |
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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.TreeMap; |
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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 import net.sf.ehcache.Cache; |
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17 import net.sf.ehcache.Element; |
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18 |
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19 import de.intevation.flys.artifacts.cache.CacheFactory; |
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20 |
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21 import org.apache.log4j.Logger; |
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4615 | 23 /** SQL Statement, create PreparedStatement. */ |
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24 public class CompiledStatement |
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25 { |
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26 private static Logger log = Logger.getLogger(CompiledStatement.class); |
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27 |
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28 public static final String DATACAGE_DB_CACHE = |
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29 "datacage.db"; |
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30 |
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31 public static final Pattern VAR = |
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32 Pattern.compile("\\$\\{([a-zA-Z0-9_-]+)\\}"); |
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33 |
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34 protected String original; |
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35 protected String statement; |
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36 |
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37 protected Map<String, List<Integer>> positions; |
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38 |
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39 protected int numVars; |
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40 |
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41 public class Instance { |
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42 |
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43 protected PreparedStatement preparedStatement; |
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44 |
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45 public Instance() { |
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46 } |
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47 |
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48 protected ResultData executeCached( |
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49 Cache cache, |
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50 Connection connection, |
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51 StackFrames frames |
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52 ) |
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53 throws SQLException |
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54 { |
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55 log.debug("executeCached"); |
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56 Object [] values = new Object[numVars]; |
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57 |
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58 StringBuilder sb = new StringBuilder(original); |
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59 |
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60 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) { |
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61 String key = entry.getKey(); |
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62 Object value = frames.get(key); |
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63 sb.append(';').append(key).append(':').append(value); |
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64 for (Integer index: entry.getValue()) { |
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65 values[index] = value; |
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66 } |
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67 } |
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68 |
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69 // XXX: Maybe too many collisions? |
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70 // String key = original + Arrays.hashCode(values); |
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71 String key = sb.toString(); |
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72 |
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73 Element element = cache.get(key); |
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74 |
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75 if (element != null) { |
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76 return (ResultData)element.getValue(); |
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77 } |
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78 |
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79 if (preparedStatement == null) { |
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80 preparedStatement = connection.prepareStatement(statement); |
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81 } |
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82 |
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83 for (int i = 0; i < values.length; ++i) { |
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84 preparedStatement.setObject(i+1, values[i]); |
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85 } |
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86 |
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87 ResultData data; |
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88 |
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89 if (log.isDebugEnabled()) { |
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90 log.debug("executing: " + statement); |
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91 } |
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92 |
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93 ResultSet result = preparedStatement.executeQuery(); |
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94 try { |
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95 data = new ResultData(preparedStatement.getMetaData()) |
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96 .addAll(result); |
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97 } |
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98 finally { |
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99 result.close(); |
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100 } |
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101 |
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102 element = new Element(key, data); |
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103 cache.put(element); |
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104 |
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105 return data; |
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106 } |
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107 |
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108 protected ResultData executeUncached( |
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109 Connection connection, |
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110 StackFrames frames |
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111 ) |
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112 throws SQLException |
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113 { |
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114 log.debug("executeUncached"); |
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115 if (preparedStatement == null) { |
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116 if (log.isDebugEnabled()) { |
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117 log.debug("preparing statement: " + statement); |
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118 } |
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119 preparedStatement = connection.prepareStatement(statement); |
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120 } |
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121 |
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122 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) { |
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123 Object value = frames.get(entry.getKey()); |
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124 for (Integer index: entry.getValue()) { |
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125 preparedStatement.setObject(index+1, value); |
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126 } |
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127 } |
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128 |
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129 if (log.isDebugEnabled()) { |
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130 log.debug("executing: " + statement); |
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131 } |
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132 |
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133 ResultSet result = preparedStatement.executeQuery(); |
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134 try { |
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135 return new ResultData(preparedStatement.getMetaData()) |
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136 .addAll(result); |
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137 } |
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138 finally { |
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139 result.close(); |
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140 } |
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141 } |
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142 |
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143 public ResultData execute( |
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144 Connection connection, |
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145 StackFrames frames, |
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146 boolean cached |
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147 ) |
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148 throws SQLException |
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149 { |
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150 if (!cached) { |
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151 return executeUncached(connection, frames); |
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152 } |
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153 |
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154 Cache cache = CacheFactory.getCache(DATACAGE_DB_CACHE); |
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155 |
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156 return cache != null |
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157 ? executeCached(cache, connection, frames) |
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158 : executeUncached(connection, frames); |
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159 } |
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160 |
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161 public void close() { |
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162 if (preparedStatement != null) { |
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163 try { |
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164 preparedStatement.close(); |
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165 } |
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166 catch (SQLException sqle) { |
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167 } |
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168 preparedStatement = null; |
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169 } |
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170 } |
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171 } // class Instance |
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172 |
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173 public CompiledStatement() { |
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174 } |
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175 |
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176 public CompiledStatement(String original) { |
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177 this.original = original; |
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178 // TreeMap to ensure order |
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179 positions = new TreeMap<String, List<Integer>>(); |
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180 compile(); |
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181 } |
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182 |
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183 protected void compile() { |
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184 |
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185 StringBuffer sb = new StringBuffer(); |
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186 |
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187 Matcher m = VAR.matcher(original); |
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188 |
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189 int index = 0; |
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190 |
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191 // Find variables like ${varname}. |
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192 while (m.find()) { |
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193 String key = m.group(1).toUpperCase(); |
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194 List<Integer> indices = positions.get(key); |
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195 if (indices == null) { |
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196 indices = new ArrayList<Integer>(); |
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197 positions.put(key, indices); |
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198 } |
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199 indices.add(index); |
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200 m.appendReplacement(sb, "?"); |
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201 ++index; |
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202 } |
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203 |
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204 m.appendTail(sb); |
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205 |
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206 numVars = index; |
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207 |
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208 statement = sb.toString(); |
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209 } |
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210 |
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211 public String getStatement() { |
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212 return statement; |
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213 } |
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214 } |
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215 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |