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annotate Framework/MySQL/MySQLDatabase.cpp @ 135:e26690365c25

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MySQL: Added an advisory lock to avoid race conditions during database setup
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 08 May 2019 21:09:18 +0200
parents 714c5d2bee76
children 52b3859ee0b7
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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714c5d2bee76 preparing for 2019
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5 * Copyright (C) 2017-2019 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "MySQLDatabase.h"
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23
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24 #include "MySQLResult.h"
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25 #include "MySQLStatement.h"
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26 #include "MySQLTransaction.h"
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27 #include "../Common/ImplicitTransaction.h"
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28 #include "../Common/Integer64Value.h"
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29
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30 #include <Core/Logging.h>
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31 #include <Core/OrthancException.h>
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32 #include <Core/Toolbox.h>
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33
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5a97c68a7a51 fix mysql msvc
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34 #include <errmsg.h>
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35 #include <mysqld_error.h>
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36
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37 #include <memory>
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38 #include <boost/thread.hpp>
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39
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40 namespace OrthancDatabases
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41 {
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42 void MySQLDatabase::Close()
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43 {
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44 if (mysql_ != NULL)
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45 {
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46 LOG(INFO) << "Closing connection to MySQL database";
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47 mysql_close(mysql_);
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48 mysql_ = NULL;
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49 }
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50 }
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52
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53 void MySQLDatabase::CheckErrorCode(int code)
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54 {
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55 if (code == 0)
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56 {
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57 return;
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58 }
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59 else
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60 {
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61 LogError();
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62
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63 unsigned int error = mysql_errno(mysql_);
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64 if (error == CR_SERVER_GONE_ERROR ||
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65 error == CR_SERVER_LOST ||
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66 error == ER_QUERY_INTERRUPTED)
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67 {
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68 throw Orthanc::OrthancException(Orthanc::ErrorCode_DatabaseUnavailable);
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69 }
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70 else
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71 {
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72 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
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73 }
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74 }
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75 }
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78 MySQLDatabase::MySQLDatabase(const MySQLParameters& parameters) :
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79 parameters_(parameters),
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80 mysql_(NULL)
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81 {
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82 }
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83
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84
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85 MySQLDatabase::~MySQLDatabase()
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86 {
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87 try
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88 {
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89 Close();
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90 }
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91 catch (Orthanc::OrthancException&)
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92 {
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93 // Ignore possible exceptions due to connection loss
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94 }
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95 }
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96
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97
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98 void MySQLDatabase::LogError()
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99 {
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100 if (mysql_ != NULL)
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101 {
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102 LOG(ERROR) << "MySQL error (" << mysql_errno(mysql_)
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103 << "," << mysql_sqlstate(mysql_)
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104 << "): " << mysql_error(mysql_);
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105 }
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106 }
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107
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108
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109 MYSQL* MySQLDatabase::GetObject()
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110 {
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111 if (mysql_ == NULL)
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112 {
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113 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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114 }
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115 else
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116 {
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117 return mysql_;
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118 }
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119 }
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120
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121
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122 void MySQLDatabase::OpenInternal(const char* db)
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123 {
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124 if (mysql_ != NULL)
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125 {
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126 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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127 }
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128
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129 mysql_ = mysql_init(NULL);
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130 if (mysql_ == NULL)
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131 {
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132 LOG(ERROR) << "Cannot initialize the MySQL connector";
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133 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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134 }
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135
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136 if (parameters_.GetUnixSocket().empty())
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137 {
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138 // Fallback to TCP connection if no UNIX socket is provided
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139 unsigned int protocol = MYSQL_PROTOCOL_TCP;
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140 mysql_options(mysql_, MYSQL_OPT_PROTOCOL, (unsigned int *) &protocol);
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141 }
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142
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143 const char* socket = (parameters_.GetUnixSocket().empty() ? NULL :
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144 parameters_.GetUnixSocket().c_str());
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145
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146 if (mysql_real_connect(mysql_,
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147 parameters_.GetHost().c_str(),
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148 parameters_.GetUsername().c_str(),
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149 parameters_.GetPassword().c_str(), db,
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150 parameters_.GetPort(), socket, 0) == 0)
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151 {
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152 LogError();
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153 Close();
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154 throw Orthanc::OrthancException(Orthanc::ErrorCode_DatabaseUnavailable);
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155 }
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156 else
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157 {
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158 LOG(INFO) << "Successful connection to MySQL database";
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159 }
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160
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161 if (mysql_set_character_set(mysql_, "utf8mb4") != 0)
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162 {
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163 LOG(ERROR) << "Cannot set the character set to UTF8";
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164 Close();
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165 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
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166 }
16
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167 }
0
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168
23
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169
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170 void MySQLDatabase::Open()
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171 {
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172 if (parameters_.GetDatabase().empty())
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173 {
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174 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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175 }
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176 else
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177 {
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178 OpenInternal(parameters_.GetDatabase().c_str());
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179 }
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180 }
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181
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182
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183 void MySQLDatabase::ClearDatabase(const MySQLParameters& parameters)
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184 {
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185 MySQLDatabase db(parameters);
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186 db.OpenRoot();
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187
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188 const std::string& database = parameters.GetDatabase();
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189
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190 {
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191 MySQLTransaction t(db);
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192
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193 if (!db.DoesDatabaseExist(t, database))
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194 {
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195 LOG(ERROR) << "Inexistent database, please create it first: " << database;
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196 throw Orthanc::OrthancException(Orthanc::ErrorCode_UnknownResource);
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197 }
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198
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199 db.Execute("DROP DATABASE " + database, false);
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200 db.Execute("CREATE DATABASE " + database, false);
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201 t.Commit();
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202 }
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203 }
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204
0
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205
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206 namespace
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207 {
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208 class ResultWrapper : public boost::noncopyable
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209 {
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210 private:
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211 MYSQL_RES *result_;
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212
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213 public:
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214 ResultWrapper(MySQLDatabase& mysql,
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215 const std::string& sql) :
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216 result_(NULL)
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217 {
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218 if (mysql_real_query(mysql.GetObject(), sql.c_str(), sql.size()))
0
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219 {
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220 mysql.LogError();
0
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221 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
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222 }
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223
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224 result_ = mysql_use_result(mysql.GetObject());
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225 if (result_ == NULL)
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226 {
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227 mysql.LogError();
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228 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
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229 }
0
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230 }
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231
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232 ~ResultWrapper()
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233 {
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234 if (result_ != NULL)
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235 {
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236 mysql_free_result(result_);
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237 result_ = NULL;
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238 }
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parents: 6
diff changeset
239 }
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240
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241 MYSQL_RES *GetObject()
0
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242 {
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243 return result_;
0
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244 }
16
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245 };
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246 }
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247
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248
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249 bool MySQLDatabase::LookupGlobalStringVariable(std::string& value,
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250 const std::string& variable)
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251 {
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252 ResultWrapper result(*this, "SELECT @@global." + variable);
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253
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254 MYSQL_ROW row = mysql_fetch_row(result.GetObject());
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255 if (mysql_errno(mysql_) == 0 &&
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256 row &&
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257 row[0])
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258 {
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259 value = std::string(row[0]);
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260 return true;
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parents: 6
diff changeset
261 }
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diff changeset
262 else
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263 {
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264 return false;
0
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parents:
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265 }
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266 }
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267
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268
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269 bool MySQLDatabase::LookupGlobalIntegerVariable(int64_t& value,
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270 const std::string& variable)
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271 {
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272 std::string s;
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273
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274 if (LookupGlobalStringVariable(s, variable))
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275 {
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276 try
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277 {
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278 value = boost::lexical_cast<int64_t>(s);
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279 return true;
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280 }
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281 catch (boost::bad_lexical_cast&)
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282 {
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283 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
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284 }
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285 }
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286 else
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287 {
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288 return false;
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parents: 6
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289 }
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290 }
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parents: 6
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291
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diff changeset
292
135
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293 bool MySQLDatabase::RunAdvisoryLockStatement(const std::string& s)
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294 {
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295 Query query(s, false);
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296 MySQLStatement statement(*this, query);
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297
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298 MySQLTransaction t(*this);
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299 Dictionary args;
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300
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301 std::auto_ptr<IResult> result(t.Execute(statement, args));
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302
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303 bool success = (!result->IsDone() &&
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304 result->GetField(0).GetType() == ValueType_Integer64 &&
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305 dynamic_cast<const Integer64Value&>(result->GetField(0)).GetValue() == 1);
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306
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307 t.Commit();
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308
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309 return success;
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310 }
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311
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312
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313 bool MySQLDatabase::AcquireAdvisoryLock(int32_t lock)
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314 {
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315 return RunAdvisoryLockStatement("SELECT GET_LOCK('Lock" +
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316 boost::lexical_cast<std::string>(lock) + "', 0);");
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317 }
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318
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319
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320 bool MySQLDatabase::ReleaseAdvisoryLock(int32_t lock)
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321 {
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322 return RunAdvisoryLockStatement("SELECT RELEASE_LOCK('Lock" +
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323 boost::lexical_cast<std::string>(lock) + "');");
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324 }
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325
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326
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327 void MySQLDatabase::AdvisoryLock(int32_t lock)
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328 {
135
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329 if (!AcquireAdvisoryLock(lock))
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330 {
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331 LOG(ERROR) << "The MySQL database is locked by another instance of Orthanc";
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332 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
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333 }
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334 }
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335
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336
0
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337 bool MySQLDatabase::DoesTableExist(MySQLTransaction& transaction,
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338 const std::string& name)
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339 {
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340 if (mysql_ == NULL)
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341 {
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342 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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343 }
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344
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345 if (!IsValidDatabaseIdentifier(name))
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346 {
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347 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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348 }
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349
0
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350 Query query("SELECT COUNT(*) FROM information_schema.TABLES WHERE "
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351 "(TABLE_SCHEMA = ${database}) AND (TABLE_NAME = ${table})", true);
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352 query.SetType("database", ValueType_Utf8String);
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353 query.SetType("table", ValueType_Utf8String);
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354
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355 MySQLStatement statement(*this, query);
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356
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357 Dictionary args;
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358 args.SetUtf8Value("database", parameters_.GetDatabase());
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359 args.SetUtf8Value("table", name);
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360
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361 std::auto_ptr<IResult> result(statement.Execute(transaction, args));
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362 return (!result->IsDone() &&
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363 result->GetFieldsCount() == 1 &&
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364 result->GetField(0).GetType() == ValueType_Integer64 &&
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365 dynamic_cast<const Integer64Value&>(result->GetField(0)).GetValue() == 1);
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366 }
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367
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368
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369 bool MySQLDatabase::DoesDatabaseExist(MySQLTransaction& transaction,
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370 const std::string& name)
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371 {
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372 if (mysql_ == NULL)
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373 {
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374 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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375 }
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376
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377 if (!IsValidDatabaseIdentifier(name))
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378 {
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379 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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380 }
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381
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382 Query query("SELECT COUNT(*) FROM information_schema.SCHEMATA "
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383 "WHERE SCHEMA_NAME = ${database}", true);
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384 query.SetType("database", ValueType_Utf8String);
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385
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386 MySQLStatement statement(*this, query);
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387
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388 Dictionary args;
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389 args.SetUtf8Value("database", name);
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390
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391 std::auto_ptr<IResult> result(statement.Execute(transaction, args));
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392 return (!result->IsDone() &&
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393 result->GetFieldsCount() == 1 &&
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394 result->GetField(0).GetType() == ValueType_Integer64 &&
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395 dynamic_cast<const Integer64Value&>(result->GetField(0)).GetValue() == 1);
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396 }
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397
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398
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399 void MySQLDatabase::Execute(const std::string& sql,
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400 bool arobaseSeparator)
0
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401 {
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402 if (mysql_ == NULL)
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403 {
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404 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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405 }
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406
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407 // This emulates the behavior of "CLIENT_MULTI_STATEMENTS" in
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408 // "mysql_real_connect()", avoiding to implement a loop over
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409 // "mysql_query()"
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410 std::vector<std::string> commands;
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411 Orthanc::Toolbox::TokenizeString(commands, sql, ';');
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412
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413 for (size_t i = 0; i < commands.size(); i++)
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414 {
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415 std::string s = Orthanc::Toolbox::StripSpaces(commands[i]);
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diff changeset
416
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417 if (!s.empty())
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418 {
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419 if (arobaseSeparator)
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420 {
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421 // Replace the escape character "@" by a semicolon
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diff changeset
422 std::replace(s.begin(), s.end(), '@', ';');
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diff changeset
423 }
0
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424
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425 LOG(TRACE) << "MySQL: " << s;
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426 CheckErrorCode(mysql_query(mysql_, s.c_str()));
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427 }
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428 }
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429 }
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430
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431
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432 IPrecompiledStatement* MySQLDatabase::Compile(const Query& query)
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433 {
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434 if (mysql_ == NULL)
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435 {
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436 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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437 }
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438
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439 return new MySQLStatement(*this, query);
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440 }
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441
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442
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443
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444 namespace
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445 {
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446 class MySQLImplicitTransaction : public ImplicitTransaction
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447 {
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448 private:
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449 MySQLDatabase& db_;
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450
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451 protected:
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452 virtual IResult* ExecuteInternal(IPrecompiledStatement& statement,
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453 const Dictionary& parameters)
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454 {
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455 return dynamic_cast<MySQLStatement&>(statement).Execute(*this, parameters);
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456 }
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457
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458 virtual void ExecuteWithoutResultInternal(IPrecompiledStatement& statement,
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459 const Dictionary& parameters)
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460 {
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461 dynamic_cast<MySQLStatement&>(statement).ExecuteWithoutResult(*this, parameters);
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462 }
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463
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464 public:
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465 MySQLImplicitTransaction(MySQLDatabase& db) :
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466 db_(db)
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467 {
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468 }
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469 };
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470 }
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471
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472
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473 ITransaction* MySQLDatabase::CreateTransaction(bool isImplicit)
0
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474 {
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475 if (mysql_ == NULL)
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476 {
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477 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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478 }
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479
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480 if (isImplicit)
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481 {
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482 return new MySQLImplicitTransaction(*this);
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483 }
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484 else
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485 {
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486 return new MySQLTransaction(*this);
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487 }
0
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488 }
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489
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490
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491 void MySQLDatabase::GlobalFinalization()
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492 {
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493 mysql_library_end();
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494 }
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495
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496
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497 bool MySQLDatabase::IsValidDatabaseIdentifier(const std::string& s)
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498 {
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499 for (size_t i = 0; i < s.length(); i++)
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500 {
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501 // https://dev.mysql.com/doc/refman/8.0/en/identifiers.html
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502 if (!isalnum(s[i]) &&
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503 s[i] != '$' &&
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504 s[i] != '_')
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505 {
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506 return false;
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507 }
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508 }
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509
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510 return true;
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511 }
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512
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513
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514 MySQLDatabase::TransientAdvisoryLock::
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515 TransientAdvisoryLock(MySQLDatabase& database,
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516 int32_t lock) :
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517 database_(database),
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518 lock_(lock)
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519 {
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520 bool locked = true;
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521
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522 for (unsigned int i = 0; i < 10; i++)
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523 {
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524 if (database_.AcquireAdvisoryLock(lock_))
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525 {
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526 locked = false;
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527 break;
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528 }
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529 else
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530 {
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531 boost::this_thread::sleep(boost::posix_time::milliseconds(500));
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532 }
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533 }
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534
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535 if (locked)
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536 {
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537 LOG(ERROR) << "Cannot acquire a transient advisory lock";
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538 throw Orthanc::OrthancException(Orthanc::ErrorCode_Plugin);
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539 }
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540 }
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541
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542
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543 MySQLDatabase::TransientAdvisoryLock::~TransientAdvisoryLock()
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544 {
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545 database_.ReleaseAdvisoryLock(lock_);
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546 }
0
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547 }