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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetDriver.java.in @ 180:fdf4c888d5b7

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Small code and layout improvements
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 05 Oct 2017 17:01:17 +0200 (2017-10-05)
parents 8700d9ef2ace
children 1296dbcc4958
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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 *
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2017 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.net.URISyntaxException;
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13 import java.sql.Connection;
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14 import java.sql.Driver;
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15 import java.sql.DriverManager;
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16 import java.sql.DriverPropertyInfo;
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17 import java.sql.SQLException;
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18 import java.sql.SQLFeatureNotSupportedException;
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19 import java.sql.SQLNonTransientConnectionException;
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20 import java.sql.Types;
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21 import java.util.ArrayList;
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22 import java.util.List;
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23 import java.util.Map.Entry;
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24 import java.util.Properties;
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25 import java.util.logging.Logger;
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26
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27 /**
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28 * A Driver suitable for the MonetDB database.
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29 *
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30 * This driver will be used by the DriverManager to determine if an URL
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31 * is to be handled by this driver, and if it does, then this driver
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32 * will supply a Connection suitable for MonetDB.
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33 *
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34 * This class has no explicit constructor, the default constructor
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35 * generated by the Java compiler will be sufficient since nothing has
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36 * to be set in order to use this driver.
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37 *
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38 * This Driver supports MonetDB database URLs. MonetDB URLs are defined
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39 * as:
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40 * <tt>jdbc:monetdb://&lt;host&gt;[:&lt;port&gt;]/&lt;database&gt;</tt>
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41 * where [:&lt;port&gt;] denotes that a port is optional. If not
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42 * given the default (@JDBC_DEF_PORT@) will be used.
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43 *
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44 * @author Fabian Groffen
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45 * @version @JDBC_MAJOR@.@JDBC_MINOR@ (@JDBC_VER_SUFFIX@)
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46 */
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47 final public class MonetDriver implements Driver {
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48 // the url kind will be jdbc:monetdb://<host>[:<port>]/<database>
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49 // Chapter 9.2.1 from Sun JDBC 3.0 specification
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50 /** The prefix of a MonetDB url */
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51 private static final String MONETURL = "jdbc:monetdb://";
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52 /** Major version of this driver */
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53 private static final int DRIVERMAJOR = @JDBC_MAJOR@;
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54 /** Minor version of this driver */
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55 private static final int DRIVERMINOR = @JDBC_MINOR@;
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56 /** Version suffix string */
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57 private static final String DRIVERVERSIONSUFFIX =
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58 "@JDBC_VER_SUFFIX@ based on MCL v@MCL_MAJOR@.@MCL_MINOR@";
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59 // We're not fully compliant, but what we support is compliant
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60 /** Whether this driver is JDBC compliant or not */
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61 private static final boolean MONETJDBCCOMPLIANT = false;
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62
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63 /** MonetDB default port to connect to */
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64 private static final String PORT = "@JDBC_DEF_PORT@";
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65
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66
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67 // initialize this class: register it at the DriverManager
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68 // Chapter 9.2 from Sun JDBC 3.0 specification
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69 static {
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70 try {
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71 DriverManager.registerDriver(new MonetDriver());
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72 } catch (SQLException e) {
0
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73 e.printStackTrace();
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74 }
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75 }
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76
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77 //== methods of interface Driver
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78
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79 /**
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80 * Retrieves whether the driver thinks that it can open a connection to the
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81 * given URL. Typically drivers will return true if they understand the
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82 * subprotocol specified in the URL and false if they do not.
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83 *
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84 * @param url the URL of the database
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85 * @return true if this driver understands the given URL; false otherwise
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86 */
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87 @Override
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88 public boolean acceptsURL(String url) {
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89 return url != null && url.startsWith(MONETURL);
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90 }
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91
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92 /**
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93 * Attempts to make a database connection to the given URL. The driver
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94 * should return "null" if it realizes it is the wrong kind of driver to
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95 * connect to the given URL. This will be common, as when the JDBC driver
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96 * manager is asked to connect to a given URL it passes the URL to each
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97 * loaded driver in turn.
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98 *
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99 * The driver should throw an SQLException if it is the right driver to
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100 * connect to the given URL but has trouble connecting to the database.
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101 *
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102 * The java.util.Properties argument can be used to pass arbitrary string
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103 * tag/value pairs as connection arguments. Normally at least "user" and
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104 * "password" properties should be included in the Properties object.
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105 *
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106 * @param url the URL of the database to which to connect
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107 * @param info a list of arbitrary string tag/value pairs as connection
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108 * arguments. Normally at least a "user" and "password" property
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109 * should be included
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110 * @return a Connection object that represents a connection to the URL
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111 * @throws SQLException if a database access error occurs
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112 */
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113 @Override
0
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114 public Connection connect(String url, Properties info)
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115 throws SQLException
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116 {
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117 int tmp;
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118 Properties props = new Properties();
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119 // set the optional properties and their defaults here
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120 props.put("port", PORT);
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121 props.put("debug", "false");
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122 props.put("language", "sql"); // mal, sql, <future>
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123 props.put("so_timeout", "0");
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124
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125 props.putAll(info);
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126 info = props;
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127
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128 // url should be of style jdbc:monetdb://<host>/<database>
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129 if (!acceptsURL(url))
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130 throw new SQLNonTransientConnectionException("Invalid URL: it does not start with: " + MONETURL, "08M26");
0
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131
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132 // remove leading "jdbc:" so the rest is a valid hierarchical URI
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133 URI uri;
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134 try {
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135 uri = new URI(url.substring(5));
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136 } catch (URISyntaxException e) {
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137 throw new SQLNonTransientConnectionException(e.toString(), "08M26");
0
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138 }
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139
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140 String uri_host = uri.getHost();
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141 if (uri_host == null)
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142 throw new SQLNonTransientConnectionException("Invalid URL: no hostname given or unparsable in '" + url + "'", "08M26");
0
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143 info.put("host", uri_host);
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144
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145 int uri_port = uri.getPort();
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146 if (uri_port > 0)
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147 info.put("port", Integer.toString(uri_port));
0
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148
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149 // check the database
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150 String uri_path = uri.getPath();
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151 if (uri_path != null && uri_path.length() != 0) {
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152 uri_path = uri_path.substring(1);
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153 if (!uri_path.trim().isEmpty())
0
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154 info.put("database", uri_path);
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155 }
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156
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157 String uri_query = uri.getQuery();
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158 if (uri_query != null) {
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159 // handle additional arguments
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160 String args[] = uri_query.split("&");
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161 for (int i = 0; i < args.length; i++) {
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162 tmp = args[i].indexOf('=');
0
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163 if (tmp > 0)
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164 info.put(args[i].substring(0, tmp), args[i].substring(tmp + 1));
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165 }
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166 }
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167
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168 // finally return the Connection as requested
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169 return new MonetConnection(info);
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170 }
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171
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172 /**
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173 * Retrieves the driver's major version number. Initially this should be 1.
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174 *
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175 * @return this driver's major version number
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176 */
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177 @Override
0
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178 public int getMajorVersion() {
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179 return DRIVERMAJOR;
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180 }
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181
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182 /**
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183 * Gets the driver's minor version number. Initially this should be 0.
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184 *
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185 * @return this driver's minor version number
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186 */
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187 @Override
0
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188 public int getMinorVersion() {
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189 return DRIVERMINOR;
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190 }
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191
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192 /**
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193 * Gets information about the possible properties for this driver.
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194 *
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195 * The getPropertyInfo method is intended to allow a generic GUI tool to
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196 * discover what properties it should prompt a human for in order to get
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197 * enough information to connect to a database. Note that depending on the
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198 * values the human has supplied so far, additional values may become
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199 * necessary, so it may be necessary to iterate though several calls to the
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200 * getPropertyInfo method.
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201 *
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202 * @param url the URL of the database to which to connect
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203 * @param info a proposed list of tag/value pairs that will be sent on
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204 * connect open
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205 * @return an array of DriverPropertyInfo objects describing possible
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206 * properties. This array may be an empty array if no properties
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207 * are required.
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208 */
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209 @Override
0
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210 public DriverPropertyInfo[] getPropertyInfo(String url, Properties info) {
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211 if (!acceptsURL(url))
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212 return null;
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213
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214 List<DriverPropertyInfo> props = new ArrayList<DriverPropertyInfo>();
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215
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216 DriverPropertyInfo prop = new DriverPropertyInfo("user", info.getProperty("user"));
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217 prop.required = true;
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218 prop.description = "The user loginname to use when authenticating on the database server";
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219 props.add(prop);
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220
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221 prop = new DriverPropertyInfo("password", info.getProperty("password"));
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222 prop.required = true;
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223 prop.description = "The password to use when authenticating on the database server";
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224 props.add(prop);
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225
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226 prop = new DriverPropertyInfo("debug", "false");
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227 prop.required = false;
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228 prop.description = "Whether or not to create a log file for debugging purposes";
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229 props.add(prop);
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230
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231 prop = new DriverPropertyInfo("logfile", "");
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232 prop.required = false;
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233 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.";
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234 props.add(prop);
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235
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236 prop = new DriverPropertyInfo("language", "sql");
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237 prop.required = false;
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238 prop.description = "What language to use for MonetDB conversations (experts only)";
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239 props.add(prop);
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240
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241 prop = new DriverPropertyInfo("hash", "");
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242 prop.required = false;
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243 prop.description = "Force the use of the given hash algorithm during challenge response (one of SHA1, MD5, plain)";
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244 props.add(prop);
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245
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246 prop = new DriverPropertyInfo("follow_redirects", "true");
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247 prop.required = false;
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248 prop.description = "Whether redirects issued by the server should be followed";
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249 props.add(prop);
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250
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251 prop = new DriverPropertyInfo("treat_blob_as_binary", "false");
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252 prop.required = false;
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253 prop.description = "Whether BLOBs on the server should be treated as BINARY types, thus mapped to byte[]";
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254 props.add(prop);
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255
175
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256 prop = new DriverPropertyInfo("treat_clob_as_varchar", "false");
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257 prop.required = false;
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258 prop.description = "Whether CLOBs on the server should be treated and handled as VARCHAR types in the JDBC driver"; // recommend for increased performance due to less overhead
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259 props.add(prop);
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260
0
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261 prop = new DriverPropertyInfo("so_timeout", "0");
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262 prop.required = false;
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263 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
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264 props.add(prop);
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265
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266 DriverPropertyInfo[] dpi = new DriverPropertyInfo[props.size()];
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267 return props.toArray(dpi);
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268 }
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269
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270 /**
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271 * Reports whether this driver is a genuine JDBC Compliant&tm; driver. A
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272 * driver may only report true here if it passes the JDBC compliance tests;
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273 * otherwise it is required to return false.
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274 *
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275 * JDBC compliance requires full support for the JDBC API and full support
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276 * for SQL 92 Entry Level. It is expected that JDBC compliant drivers will
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277 * be available for all the major commercial databases.
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278 *
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279 * This method is not intended to encourage the development of non-JDBC
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280 * compliant drivers, but is a recognition of the fact that some vendors are
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281 * interested in using the JDBC API and framework for lightweight databases
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282 * that do not support full database functionality, or for special databases
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283 * such as document information retrieval where a SQL implementation may not
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284 * be feasible.
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285 *
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286 * @return true if this driver is JDBC Compliant; false otherwise
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287 */
144
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288 @Override
0
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289 public boolean jdbcCompliant() {
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290 return MONETJDBCCOMPLIANT;
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291 }
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292
144
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293 /**
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294 * Return the parent Logger of all the Loggers used by this data source.
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295 * This should be the Logger farthest from the root Logger that is
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296 * still an ancestor of all of the Loggers used by this data source.
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297 * Configuring this Logger will affect all of the log messages
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298 * generated by the data source.
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299 * In the worst case, this may be the root Logger.
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300 *
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301 * @return the parent Logger for this data source
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302 * @throws SQLFeatureNotSupportedException if the data source does
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303 * not use java.util.logging
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304 * @since 1.7
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305 */
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306 @Override
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307 public Logger getParentLogger() throws SQLFeatureNotSupportedException {
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308 throw new SQLFeatureNotSupportedException("java.util.logging not in use", "0A000");
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309 }
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310
0
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311 //== end methods of interface driver
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312
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313
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314 /** A static Map containing the mapping between MonetDB types and Java SQL types */
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315 /* use SELECT sqlname, * FROM sys.types order by 1, id; to view all MonetDB types */
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316 /* see http://docs.oracle.com/javase/7/docs/api/java/sql/Types.html to view all supported java SQL types */
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317 private static java.util.Map<String, Integer> typeMap = new java.util.HashMap<String, Integer>();
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318 static {
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319 // fill the typeMap once
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320 // typeMap.put("any", Integer.valueOf(Types.???));
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321 typeMap.put("bigint", Integer.valueOf(Types.BIGINT));
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322 typeMap.put("blob", Integer.valueOf(Types.BLOB));
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323 typeMap.put("boolean", Integer.valueOf(Types.BOOLEAN));
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324 typeMap.put("char", Integer.valueOf(Types.CHAR));
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325 typeMap.put("clob", Integer.valueOf(Types.CLOB));
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326 typeMap.put("date", Integer.valueOf(Types.DATE));
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327 typeMap.put("decimal", Integer.valueOf(Types.DECIMAL));
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328 typeMap.put("double", Integer.valueOf(Types.DOUBLE));
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329 // typeMap.put("geometry", Integer.valueOf(Types.???));
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330 // typeMap.put("geometrya", Integer.valueOf(Types.???));
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331 typeMap.put("hugeint", Integer.valueOf(Types.NUMERIC));
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332 typeMap.put("inet", Integer.valueOf(Types.VARCHAR));
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333 typeMap.put("int", Integer.valueOf(Types.INTEGER));
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334 typeMap.put("json", Integer.valueOf(Types.VARCHAR));
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335 // typeMap.put("mbr", Integer.valueOf(Types.???));
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336 typeMap.put("month_interval", Integer.valueOf(Types.INTEGER));
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337 typeMap.put("oid", Integer.valueOf(Types.BIGINT));
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338 // typeMap.put("ptr", Integer.valueOf(Types.???));
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339 typeMap.put("real", Integer.valueOf(Types.REAL));
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340 typeMap.put("sec_interval", Integer.valueOf(Types.DECIMAL));
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341 typeMap.put("smallint", Integer.valueOf(Types.SMALLINT));
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342 // typeMap.put("table", Integer.valueOf(Types.???));
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343 typeMap.put("time", Integer.valueOf(Types.TIME));
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344 typeMap.put("timestamp", Integer.valueOf(Types.TIMESTAMP));
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345 typeMap.put("timestamptz", Integer.valueOf(Types.TIMESTAMP));
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346 // 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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347 typeMap.put("timetz", Integer.valueOf(Types.TIME));
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348 // 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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349 typeMap.put("tinyint", Integer.valueOf(Types.TINYINT));
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350 typeMap.put("url", Integer.valueOf(Types.VARCHAR));
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351 typeMap.put("uuid", Integer.valueOf(Types.VARCHAR));
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352 typeMap.put("varchar", Integer.valueOf(Types.VARCHAR));
144
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353 typeMap.put("wrd", Integer.valueOf(Types.BIGINT)); // keep it in for older MonetDB servers
0
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354 }
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355
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356 /**
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357 * Returns the java.sql.Types equivalent of the given MonetDB type.
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358 *
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359 * @param type the type as used by MonetDB
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360 * @return the mathing java.sql.Types constant or java.sql.Types.OTHER if
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361 * nothing matched on the given string
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362 */
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363 static int getJavaType(String type) {
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364 // match the column type on a java.sql.Types constant
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365 Integer tp = typeMap.get(type);
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366 if (tp != null) {
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367 return tp.intValue();
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368 } else {
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369 // this should not be able to happen
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370 // do not assert, since maybe future versions introduce
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371 // new types
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372 return Types.OTHER;
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373 }
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374 }
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375
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376 /**
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377 * Returns a String usable in an SQL statement to map the server types
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378 * to values of java.sql.Types using the global static type map.
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379 * The returned string will be a SQL CASE x statement where the x is
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380 * replaced with the given column name (or expression) string.
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381 *
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382 * @param column a String representing the value that should be evaluated
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383 * in the SQL CASE statement
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384 * @return a SQL CASE statement
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385 */
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386 private static String TypeMapppingSQL = null; // cache to optimise getSQLTypeMap()
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387 static String getSQLTypeMap(String column) {
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388 if (TypeMapppingSQL == null) {
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389 // first time, compose TypeMappping SQL string
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390 StringBuilder val = new StringBuilder((typeMap.size() * (7 + 7 + 7 + 4)) + 14);
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391 for (Entry<String, Integer> entry : typeMap.entrySet()) {
0
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392 val.append(" WHEN '").append(entry.getKey()).append("' THEN ").append(entry.getValue().toString());
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393 }
0
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394 val.append(" ELSE ").append(Types.OTHER).append(" END");
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395 // as the typeMap is static, cache this SQL part for all next calls
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396 TypeMapppingSQL = val.toString();
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397 }
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398 return "CASE " + column + TypeMapppingSQL;
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399 }
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400
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401 /**
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402 * Returns a touched up identifying version string of this driver.
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403 *
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404 * @return the version string
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405 */
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406 public static String getDriverVersion() {
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407 return DRIVERMAJOR + "." + DRIVERMINOR + " (" + DRIVERVERSIONSUFFIX + ")";
0
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408 }
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409
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410 public static int getDriverMajorVersion() {
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411 return DRIVERMAJOR;
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412 }
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413
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414 public static int getDriverMinorVersion() {
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415 return DRIVERMINOR;
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416 }
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417 }