Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/CompiledStatement.java @ 1050:eccf966fb677
State engine: Removed CallContext from state validation.
flys-artifacts/trunk@2512 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Fri, 19 Aug 2011 14:10:18 +0000 |
parents | 5cb84ceee2a0 |
children | 94df49614d92 |
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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22 |
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23 public class CompiledStatement |
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24 { |
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25 private static Logger log = Logger.getLogger(CompiledStatement.class); |
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26 |
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27 public static final String DATACAGE_DB_CACHE = |
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28 "datacage.db"; |
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29 |
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30 public static final Pattern VAR = |
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31 Pattern.compile("\\$\\{([a-zA-Z0-9_-]+)\\}"); |
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32 |
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33 protected String original; |
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34 protected String statement; |
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35 |
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36 protected Map<String, List<Integer>> positions; |
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37 |
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38 protected int numVars; |
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39 |
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40 public class Instance { |
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41 |
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42 protected PreparedStatement preparedStatement; |
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43 |
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44 public Instance() { |
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45 } |
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46 |
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47 protected ResultData executeCached( |
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48 Cache cache, |
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49 Connection connection, |
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50 StackFrames frames |
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51 ) |
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52 throws SQLException |
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53 { |
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54 log.debug("executeCached"); |
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55 Object [] values = new Object[numVars]; |
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56 |
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57 StringBuilder sb = new StringBuilder(original); |
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58 |
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59 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) { |
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60 String key = entry.getKey(); |
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61 Object value = frames.get(key); |
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62 sb.append(';').append(key).append(':').append(value); |
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63 for (Integer index: entry.getValue()) { |
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64 values[index] = value; |
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65 } |
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66 } |
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67 |
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68 // XXX: Maybe too many collisions? |
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69 // String key = original + Arrays.hashCode(values); |
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70 String key = sb.toString(); |
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71 |
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72 Element element = cache.get(key); |
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73 |
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74 if (element != null) { |
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75 return (ResultData)element.getValue(); |
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76 } |
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77 |
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78 if (preparedStatement == null) { |
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79 preparedStatement = connection.prepareStatement(statement); |
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80 } |
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81 |
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82 for (int i = 0; i < values.length; ++i) { |
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83 preparedStatement.setObject(i+1, values[i]); |
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84 } |
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85 |
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86 ResultData data; |
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87 |
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88 ResultSet result = preparedStatement.executeQuery(); |
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89 try { |
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90 data = new ResultData(preparedStatement.getMetaData()) |
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91 .addAll(result); |
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92 } |
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93 finally { |
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94 result.close(); |
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95 } |
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96 |
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97 element = new Element(key, data); |
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98 cache.put(element); |
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99 |
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100 return data; |
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101 } |
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102 |
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103 protected ResultData executeUncached( |
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104 Connection connection, |
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105 StackFrames frames |
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106 ) |
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107 throws SQLException |
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108 { |
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109 log.debug("executeUncached"); |
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110 if (preparedStatement == null) { |
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111 if (log.isDebugEnabled()) { |
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112 log.debug("preparing statement: " + statement); |
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113 } |
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114 preparedStatement = connection.prepareStatement(statement); |
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115 } |
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116 |
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117 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) { |
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118 Object value = frames.get(entry.getKey()); |
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119 for (Integer index: entry.getValue()) { |
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120 preparedStatement.setObject(index+1, value); |
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121 } |
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122 } |
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123 |
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124 ResultSet result = preparedStatement.executeQuery(); |
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125 try { |
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126 return new ResultData(preparedStatement.getMetaData()) |
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127 .addAll(result); |
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128 } |
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129 finally { |
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130 result.close(); |
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131 } |
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132 } |
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133 |
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134 public ResultData execute( |
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135 Connection connection, |
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136 StackFrames frames, |
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137 boolean cached |
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138 ) |
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139 throws SQLException |
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140 { |
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141 if (!cached) { |
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142 return executeUncached(connection, frames); |
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143 } |
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144 |
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145 Cache cache = CacheFactory.getCache(DATACAGE_DB_CACHE); |
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146 |
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147 return cache != null |
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148 ? executeCached(cache, connection, frames) |
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149 : executeUncached(connection, frames); |
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150 } |
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151 |
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152 public void close() { |
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153 if (preparedStatement != null) { |
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154 try { |
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155 preparedStatement.close(); |
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156 } |
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157 catch (SQLException sqle) { |
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158 } |
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159 preparedStatement = null; |
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160 } |
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161 } |
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162 } // class Instance |
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163 |
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164 public CompiledStatement() { |
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165 } |
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166 |
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167 public CompiledStatement(String original) { |
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168 this.original = original; |
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169 // TreeMap to ensure order |
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170 positions = new TreeMap<String, List<Integer>>(); |
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171 compile(); |
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172 } |
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173 |
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174 protected void compile() { |
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175 |
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176 StringBuffer sb = new StringBuffer(); |
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177 |
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178 Matcher m = VAR.matcher(original); |
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179 |
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180 int index = 0; |
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181 |
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182 while (m.find()) { |
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183 String key = m.group(1); |
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184 List<Integer> indices = positions.get(key); |
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185 if (indices == null) { |
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186 indices = new ArrayList<Integer>(); |
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187 positions.put(key, indices); |
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188 } |
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189 indices.add(index); |
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190 m.appendReplacement(sb, "?"); |
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191 ++index; |
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192 } |
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193 |
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194 m.appendTail(sb); |
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195 |
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196 numVars = index; |
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197 |
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198 statement = sb.toString(); |
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199 } |
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200 |
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201 public String getStatement() { |
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202 return statement; |
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203 } |
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204 } |
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205 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |