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annotate src/main/java/org/monetdb/jdbc/MonetDriver.java.in @ 642:dd9b4fb14256

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Added recognition of 'xml' type. Use default mapping to Types.VARCHAR for easy and fast (as java.lang.String) retrieval, display and setting data of columns of type 'xml'.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 10 Feb 2022 15:12:30 +0100 (2022-02-10)
parents 06d69b82d409
children 108123ca6889
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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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6aa38e8c0f2d Updated Copyright year.
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2022 MonetDB B.V.
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7 */
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8
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9 package org.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 *<pre>
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24 * A JDBC {@link Driver} suitable for the MonetDB RDBMS.
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25 *
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26 * This driver will be used by the DriverManager to determine if an URL
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27 * is to be handled by this driver, and if it does, then this driver
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28 * will supply a Connection suitable for MonetDB.
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29 *
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30 * This class has no explicit constructor, the default constructor
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31 * generated by the Java compiler will be sufficient since nothing has
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32 * to be set in order to use this driver.
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33 *
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34 * This Driver supports MonetDB database URLs. MonetDB URLs are defined as:
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35 * <code>jdbc:monetdb://&lt;host&gt;[:&lt;port&gt;]/&lt;database&gt;</code>
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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 *</pre>
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39 *
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40 * @author Fabian Groffen
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41 * @version @JDBC_MAJOR@.@JDBC_MINOR@ (@JDBC_VER_SUFFIX@) based on MCL v@MCL_MAJOR@.@MCL_MINOR@"
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42 */
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43 public class MonetDriver implements Driver { /* cannot (yet) be final as nl.cwi.monetdb.jdbc.MonetDriver extends this class */
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44 // the url kind will be jdbc:monetdb://<host>[:<port>]/<database>
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45 // Chapter 9.2.1 from Sun JDBC 3.0 specification
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46 /** The prefix of a MonetDB url */
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47 static final String MONETURL = "jdbc:monetdb://";
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48
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49 // initialize this class: register it at the DriverManager
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50 // Chapter 9.2 from Sun JDBC 3.0 specification
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51 static {
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52 try {
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53 DriverManager.registerDriver(new MonetDriver());
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54 } catch (SQLException e) {
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55 e.printStackTrace();
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56 }
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57 }
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58
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59 //== methods of interface Driver
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60
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61 /**
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62 * Retrieves whether the driver thinks that it can open a connection to the
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63 * given URL. Typically drivers will return true if they understand the
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64 * subprotocol specified in the URL and false if they do not.
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65 *
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66 * @param url the URL of the database
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67 * @return true if this driver understands the given URL; false otherwise
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68 */
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69 @Override
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70 public boolean acceptsURL(final String url) {
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71 return url != null && url.startsWith(MONETURL);
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72 }
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73
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74 /**
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75 * Attempts to make a database connection to the given URL. The driver
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76 * should return "null" if it realizes it is the wrong kind of driver to
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77 * connect to the given URL. This will be common, as when the JDBC driver
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78 * manager is asked to connect to a given URL it passes the URL to each
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79 * loaded driver in turn.
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80 *
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81 * The driver should throw an SQLException if it is the right driver to
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82 * connect to the given URL but has trouble connecting to the database.
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83 *
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84 * The java.util.Properties argument can be used to pass arbitrary string
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85 * tag/value pairs as connection arguments. Normally at least "user" and
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86 * "password" properties should be included in the Properties object.
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87 *
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88 * @param url the URL of the database to which to connect
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89 * @param info a list of arbitrary string tag/value pairs as connection
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90 * arguments. Normally at least a "user" and "password" property
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91 * should be included
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92 * @return a Connection object that represents a connection to the URL
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93 * @throws SQLException if a database access error occurs
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94 */
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95 @Override
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96 public Connection connect(final String url, Properties info)
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97 throws SQLException
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98 {
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99 // url should be of style jdbc:monetdb://<host>/<database>
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100 if (!acceptsURL(url))
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101 return null;
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102
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103 final Properties props = new Properties();
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104 // set the optional properties and their defaults here
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105 props.put("port", "@JDBC_DEF_PORT@");
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106 props.put("debug", "false");
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107 props.put("language", "sql"); // mal, sql, <future>
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108 props.put("so_timeout", "0");
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109
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110 if (info != null)
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111 props.putAll(info);
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112 info = props;
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113
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114 // remove leading "jdbc:" so the rest is a valid hierarchical URI
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115 final URI uri;
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116 try {
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117 uri = new URI(url.substring(5));
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118 } catch (java.net.URISyntaxException e) {
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119 return null;
0
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120 }
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121
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122 final String uri_host = uri.getHost();
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123 if (uri_host == null)
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124 return null;
0
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125 info.put("host", uri_host);
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126
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127 int uri_port = uri.getPort();
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128 if (uri_port > 0)
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129 info.put("port", Integer.toString(uri_port));
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130
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131 // check the database
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132 String uri_path = uri.getPath();
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133 if (uri_path != null && !uri_path.isEmpty()) {
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134 uri_path = uri_path.substring(1).trim();
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135 if (!uri_path.isEmpty())
0
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136 info.put("database", uri_path);
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137 }
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138
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139 final String uri_query = uri.getQuery();
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140 if (uri_query != null) {
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141 int pos;
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142 // handle additional connection properties separated by the & character
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143 final String args[] = uri_query.split("&");
0
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144 for (int i = 0; i < args.length; i++) {
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145 pos = args[i].indexOf('=');
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146 if (pos > 0)
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147 info.put(args[i].substring(0, pos), args[i].substring(pos + 1));
0
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148 }
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149 }
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150
199
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151 // finally return the Connection object as requested
0
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152 return new MonetConnection(info);
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153 }
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154
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155 /**
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156 * Retrieves the driver's major version number. Initially this should be 1.
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157 *
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158 * @return this driver's major version number
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159 */
144
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160 @Override
0
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161 public int getMajorVersion() {
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162 return @JDBC_MAJOR@;
0
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163 }
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164
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165 /**
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166 * Gets the driver's minor version number. Initially this should be 0.
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167 *
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168 * @return this driver's minor version number
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169 */
144
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170 @Override
0
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171 public int getMinorVersion() {
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172 return @JDBC_MINOR@;
0
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173 }
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174
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175 /**
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176 * Gets information about the possible properties for this driver.
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177 *
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178 * The getPropertyInfo method is intended to allow a generic GUI tool to
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179 * discover what properties it should prompt a human for in order to get
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180 * enough information to connect to a database. Note that depending on the
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181 * values the human has supplied so far, additional values may become
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182 * necessary, so it may be necessary to iterate though several calls to the
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183 * getPropertyInfo method.
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184 *
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185 * @param url the URL of the database to which to connect
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186 * @param info a proposed list of tag/value pairs that will be sent on
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187 * connect open
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188 * @return an array of DriverPropertyInfo objects describing possible
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189 * properties. This array may be an empty array if no properties
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190 * are required.
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191 */
144
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192 @Override
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193 public DriverPropertyInfo[] getPropertyInfo(final String url, final Properties info) {
0
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194 if (!acceptsURL(url))
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195 return null;
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196
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197 final String[] boolean_choices = new String[] { "true", "false" };
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198 final DriverPropertyInfo[] dpi = new DriverPropertyInfo[9]; // we currently support 9 connection properties
0
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199
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200 DriverPropertyInfo prop = new DriverPropertyInfo("user", info != null ? info.getProperty("user") : null);
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201 prop.required = true;
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202 prop.description = "The user loginname to use when authenticating on the database server";
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203 dpi[0] = prop;
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204
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205 prop = new DriverPropertyInfo("password", info != null ? info.getProperty("password") : null);
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206 prop.required = true;
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207 prop.description = "The password to use when authenticating on the database server";
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208 dpi[1] = prop;
0
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209
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210 prop = new DriverPropertyInfo("debug", "false");
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211 prop.required = false;
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212 prop.description = "Whether or not to create a log file for debugging purposes";
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213 prop.choices = boolean_choices;
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214 dpi[2] = prop;
0
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215
224
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216 prop = new DriverPropertyInfo("logfile", null);
0
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217 prop.required = false;
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218 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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219 dpi[3] = prop;
0
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220
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221 prop = new DriverPropertyInfo("language", "sql");
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222 prop.required = false;
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223 prop.description = "What language to use for MonetDB conversations (experts only)";
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224 prop.choices = new String[] { "sql", "mal" };
224
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225 dpi[4] = prop;
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226
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227 prop = new DriverPropertyInfo("hash", null);
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228 prop.required = false;
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229 prop.description = "Force the use of the given hash algorithm (SHA512 or SHA384 or SHA256 or SHA1) during challenge response";
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230 prop.choices = new String[] { "SHA512", "SHA384", "SHA256", "SHA1" };
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231 dpi[5] = prop;
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232
381
11c30e3b7966 Set the connection properties treat_clob_as_varchar and treat_blob_as_binary to true by default for faster processing (less objects created, less memory needed) when querying CLOB or BLOB column data.
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233 prop = new DriverPropertyInfo("treat_blob_as_binary", "true");
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234 prop.required = false;
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235 prop.description = "Should blob columns be mapped to Types.VARBINARY instead of Types.BLOB in ResultSets and PreparedStatements"; // recommend for increased performance due to less overhead
224
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236 prop.choices = boolean_choices;
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237 dpi[6] = prop;
0
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238
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239 prop = new DriverPropertyInfo("treat_clob_as_varchar", "true");
175
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240 prop.required = false;
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241 prop.description = "Should clob columns be mapped to Types.VARCHAR instead of Types.CLOB in ResultSets and PreparedStatements"; // recommend for increased performance due to less overhead
224
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242 prop.choices = boolean_choices;
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243 dpi[7] = prop;
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244
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245 prop = new DriverPropertyInfo("so_timeout", "0");
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246 prop.required = false;
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247 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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248 dpi[8] = prop;
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249
224
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250 /* next property is no longer supported in: new MonetConnection(props)
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251 prop = new DriverPropertyInfo("follow_redirects", "true");
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252 prop.required = false;
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253 prop.description = "Whether redirects issued by the server should be followed";
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254 prop.choices = boolean_choices;
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255 dpi[9] = prop;
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256 */
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257
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258 return dpi;
0
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259 }
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260
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261 /**
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262 * Reports whether this driver is a genuine JDBC Compliant&trade; driver. A
0
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263 * driver may only report true here if it passes the JDBC compliance tests;
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264 * otherwise it is required to return false.
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265 *
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266 * JDBC compliance requires full support for the JDBC API and full support
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267 * for SQL 92 Entry Level. It is expected that JDBC compliant drivers will
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268 * be available for all the major commercial databases.
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269 *
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270 * This method is not intended to encourage the development of non-JDBC
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271 * compliant drivers, but is a recognition of the fact that some vendors are
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272 * interested in using the JDBC API and framework for lightweight databases
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273 * that do not support full database functionality, or for special databases
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274 * such as document information retrieval where a SQL implementation may not
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275 * be feasible.
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276 *
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277 * @return true if this driver is JDBC Compliant; false otherwise
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278 */
144
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279 @Override
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280 public boolean jdbcCompliant() {
295
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281 // We're not fully JDBC compliant, but what we support is compliant
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282 return false;
0
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283 }
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284
144
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285 /**
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286 * Return the parent Logger of all the Loggers used by this data source.
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287 * This should be the Logger farthest from the root Logger that is
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288 * still an ancestor of all of the Loggers used by this data source.
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289 * Configuring this Logger will affect all of the log messages
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290 * generated by the data source.
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291 * In the worst case, this may be the root Logger.
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292 *
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293 * @return the parent Logger for this data source
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294 * @throws SQLFeatureNotSupportedException if the data source does
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295 * not use java.util.logging
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296 * @since 1.7
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297 */
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298 @Override
295
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299 public java.util.logging.Logger getParentLogger() throws SQLFeatureNotSupportedException {
262
2d62ca1f758b Moved utility method newSQLFeatureNotSupportedException(String name) from MonetPreparedStatement.java and MonetResultSet.java
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300 throw MonetWrapper.newSQLFeatureNotSupportedException("getParentLogger");
144
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301 }
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302
0
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303 //== end methods of interface driver
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304
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305
333
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306 /**
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307 * utility methods called by MonetDatabaseMetaData methods
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308 */
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309 static final int getDriverMajorVersion() {
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310 return @JDBC_MAJOR@;
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311 }
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312
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313 static final int getDriverMinorVersion() {
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314 return @JDBC_MINOR@;
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315 }
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316
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317 /**
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318 * Returns a touched up identifying version string of this driver.
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f523727db392 Moved Java classes from packages starting with nl.cwi.monetdb.* to package org.monetdb.*
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319 * It is made public as it is called from org/monetdb/client/JdbcClient.java
333
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320 * @return the version string
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321 */
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322 public static final String getDriverVersion() {
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323 return "@JDBC_MAJOR@.@JDBC_MINOR@ (@JDBC_VER_SUFFIX@ based on MCL v@MCL_MAJOR@.@MCL_MINOR@)";
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324 }
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325
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326 /** A static Map containing the mapping between MonetDB types and Java SQL types */
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327 /* use SELECT sqlname, * FROM sys.types order by 1, id; to view all MonetDB types */
380
bf521f343172 Added support for new Java 8 java.sql.Types: Types.TIME_WITH_TIMEZONE and Types.TIMESTAMP_WITH_TIMEZONE.
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328 /* see http://docs.oracle.com/javase/8/docs/api/java/sql/Types.html to view all supported java SQL types */
295
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329 private static final java.util.Map<String, Integer> typeMap = new java.util.HashMap<String, Integer>();
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330 static {
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331 // fill the typeMap once
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332 // typeMap.put("any", Integer.valueOf(Types.???));
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333 typeMap.put("bigint", Integer.valueOf(Types.BIGINT));
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334 typeMap.put("blob", Integer.valueOf(Types.BLOB));
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335 typeMap.put("boolean", Integer.valueOf(Types.BOOLEAN));
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336 typeMap.put("char", Integer.valueOf(Types.CHAR));
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337 typeMap.put("clob", Integer.valueOf(Types.CLOB));
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338 typeMap.put("date", Integer.valueOf(Types.DATE));
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50e43af49d47 Improved DatabaseMetaData.getTypeInfo() output for temporal data types: sec_interval, day_interval, month_interval, date, time, timetz, timestamp and timestamptz.
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339 typeMap.put("day_interval", Integer.valueOf(Types.NUMERIC)); // New as of Oct2020 release
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340 typeMap.put("decimal", Integer.valueOf(Types.DECIMAL));
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341 typeMap.put("double", Integer.valueOf(Types.DOUBLE));
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342 // typeMap.put("geometry", Integer.valueOf(Types.???));
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343 // typeMap.put("geometrya", Integer.valueOf(Types.???));
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344 typeMap.put("hugeint", Integer.valueOf(Types.NUMERIC));
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345 typeMap.put("inet", Integer.valueOf(Types.VARCHAR));
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346 typeMap.put("int", Integer.valueOf(Types.INTEGER));
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347 typeMap.put("json", Integer.valueOf(Types.VARCHAR));
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348 // typeMap.put("mbr", Integer.valueOf(Types.???));
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349 typeMap.put("month_interval", Integer.valueOf(Types.INTEGER));
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350 typeMap.put("oid", Integer.valueOf(Types.BIGINT));
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351 // typeMap.put("ptr", Integer.valueOf(Types.???));
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352 typeMap.put("real", Integer.valueOf(Types.REAL));
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353 typeMap.put("sec_interval", Integer.valueOf(Types.DECIMAL));
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354 typeMap.put("smallint", Integer.valueOf(Types.SMALLINT));
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355 typeMap.put("str", Integer.valueOf(Types.VARCHAR)); // MonetDB prepare <stmt> uses type 'str' (instead of varchar) for the schema, table and column metadata output. DO NOT REMOVE this entry!
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356 // typeMap.put("table", Integer.valueOf(Types.???));
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357 typeMap.put("time", Integer.valueOf(Types.TIME));
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358 typeMap.put("timestamp", Integer.valueOf(Types.TIMESTAMP));
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359 typeMap.put("timestamptz", Integer.valueOf(Types.TIMESTAMP_WITH_TIMEZONE)); // new in Java 8: Types.TIMESTAMP_WITH_TIMEZONE (value 2014)
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360 typeMap.put("timetz", Integer.valueOf(Types.TIME_WITH_TIMEZONE)); // new in Java 8: Types.TIME_WITH_TIMEZONE (value 2013)
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361 typeMap.put("tinyint", Integer.valueOf(Types.TINYINT));
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362 typeMap.put("url", Integer.valueOf(Types.VARCHAR));
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363 typeMap.put("uuid", Integer.valueOf(Types.VARCHAR));
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364 typeMap.put("varchar", Integer.valueOf(Types.VARCHAR));
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365 typeMap.put("wrd", Integer.valueOf(Types.BIGINT)); // keep it in for old (pre Dec2016) MonetDB servers
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366 typeMap.put("xml", Integer.valueOf(Types.VARCHAR)); // used when "CREATE TYPE xml EXTERNAL NAME xml;" is executed
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367 }
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368
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369 /**
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370 * Returns the java.sql.Types equivalent of the given MonetDB type name.
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371 *
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372 * @param type the SQL data type name as used by MonetDB
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373 * @return the matching java.sql.Types constant or
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374 * java.sql.Types.OTHER if nothing matched the given type name
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375 */
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376 static final int getJdbcSQLType(final String type) {
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377 // find the column type name in the typeMap
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378 final Integer tp = typeMap.get(type);
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379 if (tp != null) {
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380 return tp.intValue();
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381 }
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382 // When type name is not found in the map, for instance
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383 // when it is a new type (not yet added in the above typeMap) or
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384 // when type name is: any or geometry or geometrya or mbr or ptr or table.
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385 return Types.OTHER;
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386 }
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387
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388 /**
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389 * Returns a String usable in an SQL statement to map the server types
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390 * to values of java.sql.Types using the global static type map.
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391 * The returned string will be a SQL CASE x statement where the x is
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392 * replaced with the given column name (or expression) string.
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393 *
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394 * @param column a String representing the value that should be evaluated
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395 * in the SQL CASE statement
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396 * @return a SQL CASE statement
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397 */
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398 private static String TypeMapppingSQL; // cache to optimise getSQLTypeMap()
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399 static final String getSQLTypeMap(final String column) {
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400 if (TypeMapppingSQL == null) {
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401 // first time, compose TypeMappping SQL string
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402 final StringBuilder val = new StringBuilder((typeMap.size() * (7 + 7 + 7 + 4)) + 14);
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403 for (Entry<String, Integer> entry : typeMap.entrySet()) {
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404 val.append(" WHEN '").append(entry.getKey()).append("' THEN ").append(entry.getValue().toString());
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405 }
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406 val.append(" ELSE ").append(Types.OTHER).append(" END");
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407 // as the typeMap is static, cache this SQL part for all next calls
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408 TypeMapppingSQL = val.toString();
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409 }
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410 return "CASE " + column + TypeMapppingSQL;
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411 }
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412 }