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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetDriver.java.in @ 295:003ae6d881db

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Add "final" keyword to method arguments and local variables where possible. It discovered some bugs in the MonetStatement constructor (changed the argument instead of object variable) which are fixed now. See also https://en.wikipedia.org/wiki/Final_(Java)
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 01 Aug 2019 20:18:43 +0200 (2019-08-01)
parents 2d62ca1f758b
children 55330e40cbf1
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1 /*
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2 * This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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5 *
261
d4baf8a4b43a Update Copyright year to 2019
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2019 MonetDB B.V.
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7 */
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8
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9 package nl.cwi.monetdb.jdbc;
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10
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11 import java.net.URI;
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12 import java.sql.Connection;
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13 import java.sql.Driver;
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14 import java.sql.DriverManager;
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15 import java.sql.DriverPropertyInfo;
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16 import java.sql.SQLException;
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17 import java.sql.SQLFeatureNotSupportedException;
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18 import java.sql.Types;
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19 import java.util.Map.Entry;
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20 import java.util.Properties;
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21
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22 /**
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23 * A Driver suitable for the MonetDB database.
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24 *
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25 * This driver will be used by the DriverManager to determine if an URL
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26 * is to be handled by this driver, and if it does, then this driver
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27 * will supply a Connection suitable for MonetDB.
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28 *
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29 * This class has no explicit constructor, the default constructor
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30 * generated by the Java compiler will be sufficient since nothing has
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31 * to be set in order to use this driver.
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32 *
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33 * This Driver supports MonetDB database URLs. MonetDB URLs are defined
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34 * as:
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35 * <tt>jdbc:monetdb://&lt;host&gt;[:&lt;port&gt;]/&lt;database&gt;</tt>
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36 * where [:&lt;port&gt;] denotes that a port is optional. If not
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37 * given the default (@JDBC_DEF_PORT@) will be used.
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38 *
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39 * @author Fabian Groffen
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40 * @version @JDBC_MAJOR@.@JDBC_MINOR@ (@JDBC_VER_SUFFIX@)
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41 */
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42 final public class MonetDriver implements Driver {
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43 // the url kind will be jdbc:monetdb://<host>[:<port>]/<database>
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44 // Chapter 9.2.1 from Sun JDBC 3.0 specification
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45 /** The prefix of a MonetDB url */
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46 static final String MONETURL = "jdbc:monetdb://";
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47 /** Major version of this driver */
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48 private static final int DRIVERMAJOR = @JDBC_MAJOR@;
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49 /** Minor version of this driver */
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50 private static final int DRIVERMINOR = @JDBC_MINOR@;
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51 /** Version suffix string */
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52 private static final String DRIVERVERSIONSUFFIX =
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53 "@JDBC_VER_SUFFIX@ based on MCL v@MCL_MAJOR@.@MCL_MINOR@";
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54
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55 /** MonetDB default port to connect to */
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56 private static final String PORT = "@JDBC_DEF_PORT@";
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58
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59 // initialize this class: register it at the DriverManager
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60 // Chapter 9.2 from Sun JDBC 3.0 specification
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61 static {
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62 try {
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63 DriverManager.registerDriver(new MonetDriver());
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64 } catch (SQLException e) {
0
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65 e.printStackTrace();
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66 }
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67 }
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68
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69 //== methods of interface Driver
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70
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71 /**
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72 * Retrieves whether the driver thinks that it can open a connection to the
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73 * given URL. Typically drivers will return true if they understand the
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74 * subprotocol specified in the URL and false if they do not.
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75 *
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76 * @param url the URL of the database
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77 * @return true if this driver understands the given URL; false otherwise
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78 */
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79 @Override
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80 public boolean acceptsURL(final String url) {
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81 return url != null && url.startsWith(MONETURL);
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82 }
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83
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84 /**
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85 * Attempts to make a database connection to the given URL. The driver
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86 * should return "null" if it realizes it is the wrong kind of driver to
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87 * connect to the given URL. This will be common, as when the JDBC driver
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88 * manager is asked to connect to a given URL it passes the URL to each
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89 * loaded driver in turn.
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90 *
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91 * The driver should throw an SQLException if it is the right driver to
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92 * connect to the given URL but has trouble connecting to the database.
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93 *
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94 * The java.util.Properties argument can be used to pass arbitrary string
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95 * tag/value pairs as connection arguments. Normally at least "user" and
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96 * "password" properties should be included in the Properties object.
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97 *
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98 * @param url the URL of the database to which to connect
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99 * @param info a list of arbitrary string tag/value pairs as connection
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100 * arguments. Normally at least a "user" and "password" property
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101 * should be included
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102 * @return a Connection object that represents a connection to the URL
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103 * @throws SQLException if a database access error occurs
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104 */
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105 @Override
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106 public Connection connect(final String url, Properties info)
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107 throws SQLException
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108 {
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109 // url should be of style jdbc:monetdb://<host>/<database>
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110 if (!acceptsURL(url))
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111 return null;
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112
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113 final Properties props = new Properties();
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114 // set the optional properties and their defaults here
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115 props.put("port", PORT);
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116 props.put("debug", "false");
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117 props.put("language", "sql"); // mal, sql, <future>
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118 props.put("so_timeout", "0");
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119
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120 if (info != null)
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121 props.putAll(info);
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122 info = props;
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123
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124 // remove leading "jdbc:" so the rest is a valid hierarchical URI
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125 final URI uri;
0
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126 try {
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127 uri = new URI(url.substring(5));
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128 } catch (java.net.URISyntaxException e) {
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129 return null;
0
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130 }
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131
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132 final String uri_host = uri.getHost();
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133 if (uri_host == null)
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134 return null;
0
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135 info.put("host", uri_host);
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136
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137 int uri_port = uri.getPort();
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138 if (uri_port > 0)
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139 info.put("port", Integer.toString(uri_port));
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140
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141 // check the database
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142 String uri_path = uri.getPath();
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143 if (uri_path != null && !uri_path.isEmpty()) {
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144 uri_path = uri_path.substring(1).trim();
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145 if (!uri_path.isEmpty())
0
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146 info.put("database", uri_path);
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147 }
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148
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149 final String uri_query = uri.getQuery();
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150 if (uri_query != null) {
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151 int pos;
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152 // handle additional connection properties separated by the & character
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153 final String args[] = uri_query.split("&");
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154 for (int i = 0; i < args.length; i++) {
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155 pos = args[i].indexOf('=');
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156 if (pos > 0)
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157 info.put(args[i].substring(0, pos), args[i].substring(pos + 1));
0
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158 }
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159 }
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160
199
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161 // finally return the Connection object as requested
0
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162 return new MonetConnection(info);
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163 }
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164
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165 /**
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166 * Retrieves the driver's major version number. Initially this should be 1.
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167 *
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168 * @return this driver's major version number
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169 */
144
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170 @Override
0
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171 public int getMajorVersion() {
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172 return DRIVERMAJOR;
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173 }
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174
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175 /**
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176 * Gets the driver's minor version number. Initially this should be 0.
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177 *
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178 * @return this driver's minor version number
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179 */
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180 @Override
0
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181 public int getMinorVersion() {
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182 return DRIVERMINOR;
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183 }
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184
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185 /**
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186 * Gets information about the possible properties for this driver.
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187 *
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188 * The getPropertyInfo method is intended to allow a generic GUI tool to
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189 * discover what properties it should prompt a human for in order to get
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190 * enough information to connect to a database. Note that depending on the
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191 * values the human has supplied so far, additional values may become
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192 * necessary, so it may be necessary to iterate though several calls to the
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193 * getPropertyInfo method.
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194 *
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195 * @param url the URL of the database to which to connect
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196 * @param info a proposed list of tag/value pairs that will be sent on
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197 * connect open
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198 * @return an array of DriverPropertyInfo objects describing possible
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199 * properties. This array may be an empty array if no properties
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200 * are required.
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201 */
144
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202 @Override
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203 public DriverPropertyInfo[] getPropertyInfo(final String url, final Properties info) {
0
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204 if (!acceptsURL(url))
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205 return null;
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206
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207 final String[] boolean_choices = new String[] { "true", "false" };
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208 final String[] language_choices = new String[] { "sql", "mal" };
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209 final String[] hash_choices = new String[] { "SHA512", "SHA384", "SHA256", "SHA1", "MD5" };
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210 final DriverPropertyInfo[] dpi = new DriverPropertyInfo[9]; // we currently support 9 connection properties
0
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211
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212 DriverPropertyInfo prop = new DriverPropertyInfo("user", info != null ? info.getProperty("user") : null);
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213 prop.required = true;
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214 prop.description = "The user loginname to use when authenticating on the database server";
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215 dpi[0] = prop;
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216
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217 prop = new DriverPropertyInfo("password", info != null ? info.getProperty("password") : null);
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218 prop.required = true;
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219 prop.description = "The password to use when authenticating on the database server";
224
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220 dpi[1] = prop;
0
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221
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222 prop = new DriverPropertyInfo("debug", "false");
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223 prop.required = false;
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224 prop.description = "Whether or not to create a log file for debugging purposes";
224
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225 prop.choices = boolean_choices;
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226 dpi[2] = prop;
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227
224
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228 prop = new DriverPropertyInfo("logfile", null);
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229 prop.required = false;
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230 prop.description = "The filename to write the debug log to. Only takes effect if debug is set to true. If the file exists, an incrementing number is added, till the filename is unique.";
224
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231 dpi[3] = prop;
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232
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233 prop = new DriverPropertyInfo("language", "sql");
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234 prop.required = false;
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235 prop.description = "What language to use for MonetDB conversations (experts only)";
224
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236 prop.choices = language_choices;
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237 dpi[4] = prop;
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238
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239 prop = new DriverPropertyInfo("hash", null);
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240 prop.required = false;
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241 prop.description = "Force the use of the given hash algorithm during challenge response (one of SHA1, MD5, plain)";
224
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242 prop.choices = hash_choices;
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243 dpi[5] = prop;
0
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244
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245 prop = new DriverPropertyInfo("treat_blob_as_binary", "false");
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246 prop.required = false;
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247 prop.description = "Should blob columns be mapped to Types.VARBINARY instead of default Types.BLOB in ResultSets and PreparedStatements";
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248 prop.choices = boolean_choices;
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249 dpi[6] = prop;
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250
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251 prop = new DriverPropertyInfo("treat_clob_as_varchar", "false");
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252 prop.required = false;
224
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253 prop.description = "Should clob columns be mapped to Types.VARCHAR instead of default Types.CLOB in ResultSets and PreparedStatements"; // recommend for increased performance due to less overhead
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254 prop.choices = boolean_choices;
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255 dpi[7] = prop;
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256
0
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257 prop = new DriverPropertyInfo("so_timeout", "0");
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258 prop.required = false;
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259 prop.description = "Defines the maximum time to wait in milliseconds on a blocking read socket call"; // this corresponds to the Connection.setNetworkTimeout() method introduced in JDBC 4.1
224
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260 dpi[8] = prop;
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261
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262 /* next property is no longer supported in: new MonetConnection(props)
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263 prop = new DriverPropertyInfo("follow_redirects", "true");
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264 prop.required = false;
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265 prop.description = "Whether redirects issued by the server should be followed";
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266 prop.choices = boolean_choices;
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267 dpi[9] = prop;
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268 */
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269
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270 return dpi;
0
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271 }
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272
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273 /**
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274 * Reports whether this driver is a genuine JDBC Compliant&trade; driver. A
0
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275 * driver may only report true here if it passes the JDBC compliance tests;
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276 * otherwise it is required to return false.
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277 *
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278 * JDBC compliance requires full support for the JDBC API and full support
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279 * for SQL 92 Entry Level. It is expected that JDBC compliant drivers will
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280 * be available for all the major commercial databases.
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281 *
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282 * This method is not intended to encourage the development of non-JDBC
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283 * compliant drivers, but is a recognition of the fact that some vendors are
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284 * interested in using the JDBC API and framework for lightweight databases
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285 * that do not support full database functionality, or for special databases
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286 * such as document information retrieval where a SQL implementation may not
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287 * be feasible.
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288 *
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289 * @return true if this driver is JDBC Compliant; false otherwise
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290 */
144
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291 @Override
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292 public boolean jdbcCompliant() {
295
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293 // We're not fully JDBC compliant, but what we support is compliant
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294 return false;
0
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295 }
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296
144
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297 /**
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298 * Return the parent Logger of all the Loggers used by this data source.
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299 * This should be the Logger farthest from the root Logger that is
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300 * still an ancestor of all of the Loggers used by this data source.
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301 * Configuring this Logger will affect all of the log messages
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302 * generated by the data source.
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303 * In the worst case, this may be the root Logger.
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304 *
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305 * @return the parent Logger for this data source
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306 * @throws SQLFeatureNotSupportedException if the data source does
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307 * not use java.util.logging
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308 * @since 1.7
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309 */
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310 @Override
295
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311 public java.util.logging.Logger getParentLogger() throws SQLFeatureNotSupportedException {
262
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312 throw MonetWrapper.newSQLFeatureNotSupportedException("getParentLogger");
144
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313 }
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314
0
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315 //== end methods of interface driver
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316
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317
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318 /** A static Map containing the mapping between MonetDB types and Java SQL types */
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319 /* use SELECT sqlname, * FROM sys.types order by 1, id; to view all MonetDB types */
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320 /* see http://docs.oracle.com/javase/7/docs/api/java/sql/Types.html to view all supported java SQL types */
295
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321 private static final java.util.Map<String, Integer> typeMap = new java.util.HashMap<String, Integer>();
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322 static {
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323 // fill the typeMap once
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324 // typeMap.put("any", Integer.valueOf(Types.???));
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325 typeMap.put("bigint", Integer.valueOf(Types.BIGINT));
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326 typeMap.put("blob", Integer.valueOf(Types.BLOB));
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327 typeMap.put("boolean", Integer.valueOf(Types.BOOLEAN));
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328 typeMap.put("char", Integer.valueOf(Types.CHAR));
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329 typeMap.put("clob", Integer.valueOf(Types.CLOB));
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330 typeMap.put("date", Integer.valueOf(Types.DATE));
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331 typeMap.put("decimal", Integer.valueOf(Types.DECIMAL));
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332 typeMap.put("double", Integer.valueOf(Types.DOUBLE));
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333 // typeMap.put("geometry", Integer.valueOf(Types.???));
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334 // typeMap.put("geometrya", Integer.valueOf(Types.???));
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335 typeMap.put("hugeint", Integer.valueOf(Types.NUMERIC));
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336 typeMap.put("inet", Integer.valueOf(Types.VARCHAR));
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337 typeMap.put("int", Integer.valueOf(Types.INTEGER));
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338 typeMap.put("json", Integer.valueOf(Types.VARCHAR));
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339 // typeMap.put("mbr", Integer.valueOf(Types.???));
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340 typeMap.put("month_interval", Integer.valueOf(Types.INTEGER));
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341 typeMap.put("oid", Integer.valueOf(Types.BIGINT));
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342 // typeMap.put("ptr", Integer.valueOf(Types.???));
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343 typeMap.put("real", Integer.valueOf(Types.REAL));
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344 typeMap.put("sec_interval", Integer.valueOf(Types.DECIMAL));
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345 typeMap.put("smallint", Integer.valueOf(Types.SMALLINT));
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346 // typeMap.put("table", Integer.valueOf(Types.???));
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347 typeMap.put("time", Integer.valueOf(Types.TIME));
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348 typeMap.put("timestamp", Integer.valueOf(Types.TIMESTAMP));
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349 typeMap.put("timestamptz", Integer.valueOf(Types.TIMESTAMP));
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350 // new in Java 8: Types.TIMESTAMP_WITH_TIMEZONE (value 2014). Can't use it yet as we compile for java 7
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351 typeMap.put("timetz", Integer.valueOf(Types.TIME));
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352 // new in Java 8: Types.TIME_WITH_TIMEZONE (value 2013). Can't use it yet as we compile for java 7
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353 typeMap.put("tinyint", Integer.valueOf(Types.TINYINT));
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354 typeMap.put("url", Integer.valueOf(Types.VARCHAR));
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355 typeMap.put("uuid", Integer.valueOf(Types.VARCHAR));
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356 typeMap.put("varchar", Integer.valueOf(Types.VARCHAR));
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357 typeMap.put("wrd", Integer.valueOf(Types.BIGINT)); // keep it in for older MonetDB servers
0
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358 }
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359
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360 /**
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361 * Returns the java.sql.Types equivalent of the given MonetDB type name.
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362 *
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363 * @param type the SQL data type name as used by MonetDB
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364 * @return the matching java.sql.Types constant or
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365 * java.sql.Types.OTHER if nothing matched the given type name
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366 */
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367 static final int getJdbcSQLType(final String type) {
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368 // find the column type name in the typeMap
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369 final Integer tp = typeMap.get(type);
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370 if (tp != null) {
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371 return tp.intValue();
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372 }
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373 // When type name is not found in the map, for instance
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374 // when it is a new type (not yet added in the above typeMap) or
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375 // when type name is: any or geometry or geometrya or mbr or ptr or table.
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376 return Types.OTHER;
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377 }
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378
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379 /**
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380 * Returns a String usable in an SQL statement to map the server types
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381 * to values of java.sql.Types using the global static type map.
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382 * The returned string will be a SQL CASE x statement where the x is
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383 * replaced with the given column name (or expression) string.
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384 *
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385 * @param column a String representing the value that should be evaluated
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386 * in the SQL CASE statement
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387 * @return a SQL CASE statement
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388 */
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389 private static String TypeMapppingSQL = null; // cache to optimise getSQLTypeMap()
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390 static final String getSQLTypeMap(final String column) {
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391 if (TypeMapppingSQL == null) {
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392 // first time, compose TypeMappping SQL string
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393 final StringBuilder val = new StringBuilder((typeMap.size() * (7 + 7 + 7 + 4)) + 14);
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394 for (Entry<String, Integer> entry : typeMap.entrySet()) {
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395 val.append(" WHEN '").append(entry.getKey()).append("' THEN ").append(entry.getValue().toString());
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396 }
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397 val.append(" ELSE ").append(Types.OTHER).append(" END");
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398 // as the typeMap is static, cache this SQL part for all next calls
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399 TypeMapppingSQL = val.toString();
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400 }
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401 return "CASE " + column + TypeMapppingSQL;
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402 }
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403
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404 /**
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405 * Returns a touched up identifying version string of this driver.
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406 * It is made public as it is called from nl/cwi/monetdb/client/JdbcClient.java
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407 * @return the version string
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408 */
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409 public static final String getDriverVersion() {
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410 return DRIVERMAJOR + "." + DRIVERMINOR + " (" + DRIVERVERSIONSUFFIX + ")";
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411 }
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412
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413 static final int getDriverMajorVersion() {
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414 return DRIVERMAJOR;
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415 }
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416
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417 static final int getDriverMinorVersion() {
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418 return DRIVERMINOR;
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419 }
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420 }