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annotate flys-aft/src/main/java/de/intevation/db/Statements.java @ 4069:a4e79e8e0aa0

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Added support for symbolic SQL statements. flys-aft/trunk@3390 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 12 Dec 2011 17:52:58 +0000
parents 21e49e0a2307
children 2c70fae83d0c
rev   line source
4068
21e49e0a2307 Add infrastructure to load SQL statements for databases.
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1 package de.intevation.db;
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2
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3 import java.util.Properties;
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4
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5 import java.io.IOException;
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6 import java.io.InputStream;
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7
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8 import org.apache.log4j.Logger;
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9
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10 import java.util.List;
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11 import java.util.ArrayList;
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12 import java.util.Map;
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13 import java.util.HashMap;
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14 import java.util.Enumeration;
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15
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16 import java.sql.Connection;
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17 import java.sql.SQLException;
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18 import java.sql.PreparedStatement;
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19 import java.sql.Timestamp;
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20
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21 import java.util.regex.Matcher;
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22 import java.util.regex.Pattern;
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23
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24 public class Statements
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25 {
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26 public static final Pattern VAR = Pattern.compile(":([a-zA-Z0-9_]+)");
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27
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28 public static class SymbolicStatement {
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29
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30 protected String statement;
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31 protected String compiled;
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32 protected Map<String, List<Integer>> positions;
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33
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34 public class Instance {
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35
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36 /** TODO: Support more types. */
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37
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38 protected PreparedStatement stmnt;
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39
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40 public Instance(Connection connection) throws SQLException {
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41 stmnt = connection.prepareStatement(compiled);
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42 }
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43
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44 public void close() {
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45 try {
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46 stmnt.close();
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47 }
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48 catch (SQLException sqle) {
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49 log.error("cannot close statement", sqle);
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50 }
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51 }
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52
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53 public void setInt(String key, int value)
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54 throws SQLException
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55 {
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56 List<Integer> pos = positions.get(key.toLowerCase());
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57 if (pos != null) {
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58 for (Integer p: pos) {
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59 stmnt.setInt(p, value);
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60 }
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61 }
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62 }
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63
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64 public void setString(String key, String value)
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65 throws SQLException
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66 {
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67 List<Integer> pos = positions.get(key.toLowerCase());
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68 if (pos != null) {
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69 for (Integer p: pos) {
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70 stmnt.setString(p, value);
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71 }
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72 }
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73 }
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74
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75 public void setObject(String key, Object value)
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76 throws SQLException
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77 {
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78 List<Integer> pos = positions.get(key.toLowerCase());
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79 if (pos != null) {
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80 for (Integer p: pos) {
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81 stmnt.setObject(p, value);
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82 }
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83 }
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84 }
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85
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86 public void setTimestamp(String key, Timestamp value)
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87 throws SQLException
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88 {
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89 List<Integer> pos = positions.get(key.toLowerCase());
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90 if (pos != null) {
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91 for (Integer p: pos) {
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92 stmnt.setTimestamp(p, value);
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93 }
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94 }
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95 }
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96
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97 public void setDouble(String key, int value)
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98 throws SQLException
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99 {
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100 List<Integer> pos = positions.get(key.toLowerCase());
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101 if (pos != null) {
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102 for (Integer p: pos) {
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103 stmnt.setDouble(p, value);
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104 }
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105 }
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106 }
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107
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108 public void setNull(String key, int sqlType)
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109 throws SQLException
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110 {
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111 List<Integer> pos = positions.get(key.toLowerCase());
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112 if (pos != null) {
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113 for (Integer p: pos) {
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114 stmnt.setNull(p, sqlType);
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115 }
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116 }
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117 }
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118
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119 public void set(Map<String, Object> map) throws SQLException {
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120 for (Map.Entry<String, Object> entry: map.entrySet()) {
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121 setObject(entry.getKey(), entry.getValue());
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122 }
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123 }
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124
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125 } // class Instance
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126
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127 public SymbolicStatement(String statement) {
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128 this.statement = statement;
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129 compile();
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130 }
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131
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132 public String getStatement() {
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133 return statement;
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134 }
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135
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136 protected void compile() {
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137 positions = new HashMap<String, List<Integer>>();
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138
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139 StringBuffer sb = new StringBuffer();
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140 Matcher m = VAR.matcher(statement);
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141 int index = 1;
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142 while (m.find()) {
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143 String key = m.group(1).toLowerCase();
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144 List<Integer> list = positions.get(key);
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145 if (list == null) {
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146 list = new ArrayList<Integer>();
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147 positions.put(key, list);
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148 }
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149 list.add(index++);
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150 m.appendReplacement(sb, "?");
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151 }
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152 m.appendTail(sb);
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153 compiled = sb.toString();
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154 }
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155 } // class SymbolicStatement
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156
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157
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158 private static Logger log = Logger.getLogger(Statements.class);
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159
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160 public static final String RESOURCE_PATH = "/sql/";
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161 public static final String COMMON_PROPERTIES = "-common.properties";
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162
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163 protected String type;
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164 protected String driver;
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165
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166 protected Map<String, SymbolicStatement> statements;
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167
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168 public Statements(String type, String driver) {
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169 this.type = type;
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170 this.driver = driver;
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171 }
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172
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173 public SymbolicStatement getStatement(String key) {
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174 if (statements == null) {
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175 statements = loadStatements();
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176 }
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177 return statements.get(key);
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178 }
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179
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180 protected Map<String, SymbolicStatement> loadStatements() {
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181 Map<String, SymbolicStatement> statements =
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182 new HashMap<String, SymbolicStatement>();
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183
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184 Properties properties = loadProperties();
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185
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186 for (Enumeration e = properties.propertyNames(); e.hasMoreElements();) {
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187 String key = (String)e.nextElement();
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188 String value = properties.getProperty(key);
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189 SymbolicStatement symbolic = new SymbolicStatement(value);
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190 statements.put(key, symbolic);
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191 }
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192
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193 return statements;
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194 }
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195
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196 protected String driverToProperties() {
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197 return
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198 type + "-" +
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199 driver.replace('.', '-').toLowerCase() + ".properties";
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200 }
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201
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202 protected Properties loadCommon() {
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203 Properties common = new Properties();
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204
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205 String path = RESOURCE_PATH + type + COMMON_PROPERTIES;
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206
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207 InputStream in = Statements.class.getResourceAsStream(path);
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208
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209 if (in != null) {
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210 try {
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211 common.load(in);
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212 }
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213 catch (IOException ioe) {
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214 log.error("cannot load defaults: " + path, ioe);
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215 }
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216 finally {
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217 try {
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218 in.close();
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219 }
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220 catch (IOException ioe) {
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221 }
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222 }
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223 }
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224 else {
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225 log.warn("cannot find: " + path);
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226 }
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227
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228 return common;
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229 }
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230
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231 protected Properties loadProperties() {
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232
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233 Properties common = loadCommon();
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234
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235 Properties properties = new Properties(common);
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236
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237 String path = RESOURCE_PATH + driverToProperties();
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238
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239 InputStream in = Statements.class.getResourceAsStream(path);
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240
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241 if (in != null) {
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242 try {
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243 properties.load(in);
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244 }
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245 catch (IOException ioe) {
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246 log.error("cannot load statements: " + path, ioe);
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247 }
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248 finally {
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249 try {
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250 in.close();
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251 }
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252 catch (IOException ioe) {
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253 }
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254 }
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255 }
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256 else {
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257 log.warn("cannot find: " + path);
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258 }
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259
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260 return properties;
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261 }
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262 }
21e49e0a2307 Add infrastructure to load SQL statements for databases.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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263 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org