0
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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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5 * Copyright (C) 2017-2018 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 "PostgreSQLStatement.h"
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23
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24 #include "../Common/BinaryStringValue.h"
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25 #include "../Common/FileValue.h"
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26 #include "../Common/Integer64Value.h"
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27 #include "../Common/NullValue.h"
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28 #include "../Common/ResultBase.h"
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29 #include "../Common/Utf8StringValue.h"
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30 #include "PostgreSQLResult.h"
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31
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32 #include <Core/Logging.h>
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33 #include <Core/OrthancException.h>
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34 #include <Core/Toolbox.h>
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35
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36 #include <cassert>
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37
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38 // PostgreSQL includes
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39 #include <libpq-fe.h>
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40 #include <c.h>
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41 #include <catalog/pg_type.h>
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42
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43 #include <Core/Endianness.h>
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44
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45
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46 namespace OrthancDatabases
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47 {
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48 class PostgreSQLStatement::Inputs : public boost::noncopyable
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49 {
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50 private:
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51 std::vector<char*> values_;
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52 std::vector<int> sizes_;
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53
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54 static char* Allocate(const void* source, int size)
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55 {
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56 if (size == 0)
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57 {
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58 return NULL;
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59 }
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60 else
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61 {
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62 char* ptr = reinterpret_cast<char*>(malloc(size));
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63
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64 if (source != NULL)
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65 {
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66 memcpy(ptr, source, size);
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67 }
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68
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69 return ptr;
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70 }
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71 }
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72
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73 void Resize(size_t size)
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74 {
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75 // Shrinking of the vector
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76 for (size_t i = size; i < values_.size(); i++)
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77 {
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78 if (values_[i] != NULL)
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79 free(values_[i]);
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80 }
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81
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82 values_.resize(size, NULL);
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83 sizes_.resize(size, 0);
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84 }
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85
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86 void EnlargeForIndex(size_t index)
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87 {
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88 if (index >= values_.size())
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89 {
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90 // The vector is too small
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91 Resize(index + 1);
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92 }
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93 }
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94
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95 public:
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96 Inputs()
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97 {
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98 }
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99
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100 ~Inputs()
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101 {
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102 Resize(0);
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103 }
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104
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105 void SetItem(size_t pos, const void* source, int size)
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106 {
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107 EnlargeForIndex(pos);
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108
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109 if (sizes_[pos] == size)
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110 {
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111 if (source && size != 0)
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112 {
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113 memcpy(values_[pos], source, size);
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114 }
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115 }
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116 else
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117 {
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118 if (values_[pos] != NULL)
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119 {
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120 free(values_[pos]);
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121 }
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122
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123 values_[pos] = Allocate(source, size);
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124 sizes_[pos] = size;
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125 }
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126 }
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127
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128 void SetItem(size_t pos, int size)
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129 {
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130 SetItem(pos, NULL, size);
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131 }
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132
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133 void* GetItem(size_t pos) const
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134 {
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135 if (pos >= values_.size())
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136 {
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137 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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138 }
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139
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140 return values_[pos];
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141 }
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142
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143 const std::vector<char*>& GetValues() const
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144 {
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145 return values_;
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146 }
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147
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148 const std::vector<int>& GetSizes() const
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149 {
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150 return sizes_;
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151 }
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152 };
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153
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154
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155 void PostgreSQLStatement::Prepare()
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156 {
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157 if (id_.size() > 0)
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158 {
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159 // Already prepared
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160 return;
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161 }
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162
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163 for (size_t i = 0; i < oids_.size(); i++)
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164 {
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165 if (oids_[i] == 0)
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166 {
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167 // The type of an input parameter was not set
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168 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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169 }
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170 }
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171
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172 id_ = Orthanc::Toolbox::GenerateUuid();
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173
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174 const unsigned int* tmp = oids_.size() ? &oids_[0] : NULL;
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175
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176 PGresult* result = PQprepare(reinterpret_cast<PGconn*>(database_.pg_),
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177 id_.c_str(), sql_.c_str(), oids_.size(), tmp);
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178
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179 if (result == NULL)
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180 {
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181 id_.clear();
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182 database_.ThrowException(true);
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183 }
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184
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185 bool ok = (PQresultStatus(result) == PGRES_COMMAND_OK);
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186 if (ok)
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187 {
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188 PQclear(result);
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189 }
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190 else
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191 {
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192 std::string message = PQresultErrorMessage(result);
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193 PQclear(result);
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194 id_.clear();
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195 LOG(ERROR) << "PostgreSQL error: " << message;
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196 database_.ThrowException(false);
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197 }
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198 }
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199
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200
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201 void PostgreSQLStatement::Unprepare()
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202 {
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203 if (id_.size() > 0)
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204 {
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205 // "Although there is no libpq function for deleting a
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206 // prepared statement, the SQL DEALLOCATE statement can be
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207 // used for that purpose."
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208 //database_.Execute("DEALLOCATE " + id_);
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209 }
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210
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211 id_.clear();
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212 }
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213
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214
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215 void PostgreSQLStatement::DeclareInputInternal(unsigned int param,
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216 unsigned int /*Oid*/ type)
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217 {
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218 Unprepare();
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219
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220 if (oids_.size() <= param)
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221 {
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222 oids_.resize(param + 1, 0);
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223 binary_.resize(param + 1);
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224 }
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225
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226 oids_[param] = type;
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227 binary_[param] = (type == TEXTOID || type == BYTEAOID || type == OIDOID) ? 0 : 1;
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228 }
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229
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230
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231 void PostgreSQLStatement::DeclareInputInteger(unsigned int param)
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232 {
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233 DeclareInputInternal(param, INT4OID);
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234 }
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235
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236
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237 void PostgreSQLStatement::DeclareInputInteger64(unsigned int param)
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238 {
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239 DeclareInputInternal(param, INT8OID);
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240 }
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241
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242
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243 void PostgreSQLStatement::DeclareInputString(unsigned int param)
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244 {
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245 DeclareInputInternal(param, TEXTOID);
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246 }
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247
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248
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249 void PostgreSQLStatement::DeclareInputBinary(unsigned int param)
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250 {
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251 DeclareInputInternal(param, BYTEAOID);
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252 }
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253
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254
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255 void PostgreSQLStatement::DeclareInputLargeObject(unsigned int param)
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256 {
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257 DeclareInputInternal(param, OIDOID);
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258 }
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259
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260
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261 void* /* PGresult* */ PostgreSQLStatement::Execute()
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262 {
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263 Prepare();
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264
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265 PGresult* result;
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266
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267 if (oids_.size() == 0)
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268 {
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269 // No parameter
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270 result = PQexecPrepared(reinterpret_cast<PGconn*>(database_.pg_),
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271 id_.c_str(), 0, NULL, NULL, NULL, 1);
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272 }
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273 else
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274 {
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275 // At least 1 parameter
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276 result = PQexecPrepared(reinterpret_cast<PGconn*>(database_.pg_),
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277 id_.c_str(),
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278 oids_.size(),
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279 &inputs_->GetValues()[0],
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280 &inputs_->GetSizes()[0],
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281 &binary_[0],
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282 1);
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283 }
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284
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285 if (result == NULL)
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286 {
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287 database_.ThrowException(true);
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288 }
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289
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290 return result;
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291 }
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292
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293
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294 PostgreSQLStatement::PostgreSQLStatement(PostgreSQLDatabase& database,
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295 const std::string& sql,
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296 bool readOnly) :
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297 database_(database),
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298 readOnly_(readOnly),
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299 sql_(sql),
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300 inputs_(new Inputs),
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301 formatter_(Dialect_PostgreSQL)
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302 {
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303 LOG(TRACE) << "PostgreSQL: " << sql;
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304 }
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305
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306
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307 PostgreSQLStatement::PostgreSQLStatement(PostgreSQLDatabase& database,
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308 const Query& query) :
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309 database_(database),
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310 readOnly_(query.IsReadOnly()),
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311 inputs_(new Inputs),
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312 formatter_(Dialect_PostgreSQL)
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313 {
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314 query.Format(sql_, formatter_);
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315 LOG(TRACE) << "PostgreSQL: " << sql_;
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316
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317 for (size_t i = 0; i < formatter_.GetParametersCount(); i++)
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318 {
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319 switch (formatter_.GetParameterType(i))
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320 {
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321 case ValueType_Integer64:
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322 DeclareInputInteger64(i);
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323 break;
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324
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325 case ValueType_Utf8String:
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326 DeclareInputString(i);
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327 break;
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328
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329 case ValueType_BinaryString:
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330 DeclareInputBinary(i);
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331 break;
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332
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333 case ValueType_File:
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334 DeclareInputLargeObject(i);
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335 break;
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336
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337 case ValueType_Null:
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338 default:
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339 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented);
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340 }
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341 }
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342 }
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343
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344
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345 void PostgreSQLStatement::Run()
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346 {
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347 PGresult* result = reinterpret_cast<PGresult*>(Execute());
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348 assert(result != NULL); // An exception would have been thrown otherwise
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349
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350 bool ok = (PQresultStatus(result) == PGRES_COMMAND_OK ||
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351 PQresultStatus(result) == PGRES_TUPLES_OK);
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352 if (ok)
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353 {
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354 PQclear(result);
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355 }
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356 else
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357 {
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358 std::string error = PQresultErrorMessage(result);
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359 PQclear(result);
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360 LOG(ERROR) << "PostgreSQL error: " << error;
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361 database_.ThrowException(false);
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362 }
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363 }
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364
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365
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366 void PostgreSQLStatement::BindNull(unsigned int param)
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367 {
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368 if (param >= oids_.size())
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369 {
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370 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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371 }
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372
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373 inputs_->SetItem(param, 0);
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374 }
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375
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376
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377 void PostgreSQLStatement::BindInteger(unsigned int param,
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378 int value)
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379 {
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380 if (param >= oids_.size())
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381 {
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382 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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383 }
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384
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385 if (oids_[param] != INT4OID)
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386 {
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387 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadParameterType);
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388 }
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389
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390 assert(sizeof(int32_t) == 4);
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391 int32_t v = htobe32(static_cast<int32_t>(value));
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392 inputs_->SetItem(param, &v, sizeof(int32_t));
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393 }
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394
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395
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396 void PostgreSQLStatement::BindInteger64(unsigned int param,
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397 int64_t value)
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398 {
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399 if (param >= oids_.size())
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400 {
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401 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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402 }
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403
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404 if (oids_[param] != INT8OID)
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405 {
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406 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadParameterType);
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407 }
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408
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409 assert(sizeof(int64_t) == 8);
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410 int64_t v = htobe64(value);
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411 inputs_->SetItem(param, &v, sizeof(int64_t));
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412 }
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413
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414
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415 void PostgreSQLStatement::BindString(unsigned int param,
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416 const std::string& value)
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417 {
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418 if (param >= oids_.size())
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419 {
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420 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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421 }
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422
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423 if (oids_[param] != TEXTOID && oids_[param] != BYTEAOID)
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424 {
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425 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadParameterType);
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426 }
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427
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428 if (value.size() == 0)
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429 {
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430 inputs_->SetItem(param, "", 1 /* end-of-string character */);
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431 }
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432 else
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433 {
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434 inputs_->SetItem(param, value.c_str(),
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435 value.size() + 1); // "+1" for end-of-string character
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436 }
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437 }
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438
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439
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440 void PostgreSQLStatement::BindLargeObject(unsigned int param,
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441 const PostgreSQLLargeObject& value)
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442 {
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443 if (param >= oids_.size())
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444 {
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445 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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446 }
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447
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448 if (oids_[param] != OIDOID)
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449 {
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450 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadParameterType);
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451 }
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452
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453 inputs_->SetItem(param, value.GetOid().c_str(),
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454 value.GetOid().size() + 1); // "+1" for end-of-string character
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455 }
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456
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457
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458 class PostgreSQLStatement::ResultWrapper : public ResultBase
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459 {
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460 private:
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461 std::auto_ptr<PostgreSQLResult> result_;
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462
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463 protected:
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464 virtual IValue* FetchField(size_t index)
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465 {
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466 return result_->GetValue(index);
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467 }
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468
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469 public:
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470 ResultWrapper(PostgreSQLStatement& statement) :
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471 result_(new PostgreSQLResult(statement))
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472 {
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473 SetFieldsCount(result_->GetColumnsCount());
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474 FetchFields();
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475 }
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476
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477 virtual void Next()
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478 {
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479 result_->Next();
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480 FetchFields();
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481 }
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482
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483 virtual bool IsDone() const
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484 {
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485 return result_->IsDone();
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486 }
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487 };
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488
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489
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490 IResult* PostgreSQLStatement::Execute(PostgreSQLTransaction& transaction,
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491 const Dictionary& parameters)
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492 {
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493 for (size_t i = 0; i < formatter_.GetParametersCount(); i++)
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494 {
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495 const std::string& name = formatter_.GetParameterName(i);
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496
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497 switch (formatter_.GetParameterType(i))
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498 {
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499 case ValueType_Integer64:
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500 BindInteger64(i, dynamic_cast<const Integer64Value&>(parameters.GetValue(name)).GetValue());
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501 break;
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502
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503 case ValueType_Null:
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504 BindNull(i);
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505 break;
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506
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507 case ValueType_Utf8String:
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508 BindString(i, dynamic_cast<const Utf8StringValue&>
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509 (parameters.GetValue(name)).GetContent());
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510 break;
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511
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512 case ValueType_BinaryString:
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513 BindString(i, dynamic_cast<const BinaryStringValue&>
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514 (parameters.GetValue(name)).GetContent());
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515 break;
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516
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517 case ValueType_File:
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518 {
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519 const FileValue& blob =
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520 dynamic_cast<const FileValue&>(parameters.GetValue(name));
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521
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522 PostgreSQLLargeObject largeObject(database_, blob.GetContent());
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523 BindLargeObject(i, largeObject);
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524 break;
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525 }
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526
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527 default:
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528 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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529 }
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530 }
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531
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532 return new ResultWrapper(*this);
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533 }
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534
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535
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536 void PostgreSQLStatement::ExecuteWithoutResult(PostgreSQLTransaction& transaction,
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537 const Dictionary& parameters)
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538 {
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539 std::auto_ptr<IResult> dummy(Execute(transaction, parameters));
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540 }
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541 }
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