Mercurial > hg > orthanc-databases
annotate Framework/Odbc/OdbcResult.cpp @ 449:da0586c5cbd8 pg-transactions
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author | Alain Mazy <am@osimis.io> |
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date | Wed, 17 Jan 2024 17:29:43 +0100 |
parents | 3d6886f3e5b3 |
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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) 2017-2023 Osimis S.A., Belgium |
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6 * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium |
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7 * |
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8 * This program is free software: you can redistribute it and/or |
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9 * modify it under the terms of the GNU Affero General Public License |
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10 * as published by the Free Software Foundation, either version 3 of |
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11 * the License, or (at your option) any later version. |
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12 * |
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13 * This program is distributed in the hope that it will be useful, but |
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 * Affero General Public License for more details. |
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17 * |
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18 * You should have received a copy of the GNU Affero General Public License |
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19 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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20 **/ |
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21 |
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22 |
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23 #include "OdbcResult.h" |
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24 |
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25 #include "../Common/BinaryStringValue.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/Utf8StringValue.h" |
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29 |
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30 #include <ChunkedBuffer.h> |
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31 #include <Logging.h> |
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32 #include <OrthancException.h> |
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33 #include <Toolbox.h> |
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34 |
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35 #include <boost/lexical_cast.hpp> |
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36 #include <sqlext.h> |
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37 |
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38 |
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39 namespace OrthancDatabases |
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40 { |
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41 static void ThrowCannotReadString() |
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42 { |
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43 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Cannot read text field"); |
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44 } |
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45 |
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46 |
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47 void OdbcResult::LoadFirst() |
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48 { |
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49 if (first_) |
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50 { |
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51 Next(); |
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52 first_ = false; |
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53 } |
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54 } |
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55 |
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56 |
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57 void OdbcResult::SetValue(size_t index, |
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58 IValue* value) |
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59 { |
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60 std::unique_ptr<IValue> raii(value); |
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61 |
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62 if (index >= values_.size()) |
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63 { |
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64 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange); |
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65 } |
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66 else if (value == NULL) |
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67 { |
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68 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer); |
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69 } |
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70 else |
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71 { |
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72 if (values_[index] != NULL) |
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73 { |
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74 delete values_[index]; |
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75 } |
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76 |
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77 values_[index] = raii.release(); |
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78 } |
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79 } |
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80 |
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81 |
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82 void OdbcResult::ReadString(std::string& target, |
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83 size_t column, |
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84 bool isBinary) |
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85 { |
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86 // https://docs.microsoft.com/en-us/sql/odbc/reference/develop-app/getting-long-data |
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87 |
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88 std::string buffer; |
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89 buffer.resize(1024 * 1024); |
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90 |
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91 const SQLSMALLINT targetType = (isBinary ? SQL_BINARY : SQL_C_CHAR); |
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92 |
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93 SQLLEN length; |
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94 SQLRETURN code = SQLGetData(statement_.GetHandle(), column + 1, targetType, &buffer[0], buffer.size(), &length); |
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95 if (code == SQL_NO_DATA) |
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96 { |
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97 target.clear(); |
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98 } |
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99 else if (code == SQL_SUCCESS) |
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100 { |
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101 if (length == -1) |
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102 { |
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103 target.clear(); // No data available |
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104 } |
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105 else |
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106 { |
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107 // The "buffer" was large enough to store the text value, plus the null termination |
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108 target.assign(buffer.c_str(), length); |
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109 } |
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110 } |
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111 else if (code == SQL_SUCCESS_WITH_INFO) |
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112 { |
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113 Orthanc::ChunkedBuffer chunks; |
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114 |
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115 if (isBinary) |
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116 { |
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117 chunks.AddChunk(buffer.c_str(), buffer.size()); |
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118 } |
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119 else |
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120 { |
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121 /** |
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122 * WARNING: At this point, in the MSSQL driver, "length" |
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123 * contains the number of Unicode characters! This is |
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124 * different from the actual number of **bytes** that are |
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125 * required to store the UTF-8 string. As a consequence, the |
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126 * "length" cannot be used to determine the final size of |
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127 * the "target" string. |
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128 **/ |
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129 chunks.AddChunk(buffer.c_str(), buffer.size() - 1); |
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130 } |
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131 |
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132 for (;;) |
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133 { |
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134 code = SQLGetData(statement_.GetHandle(), column + 1, targetType, &buffer[0], buffer.size(), &length); |
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135 |
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136 if (code == SQL_SUCCESS) |
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137 { |
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138 // This is the last chunk |
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139 if (length == 0 || |
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140 length > static_cast<SQLLEN>(buffer.size())) |
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141 { |
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142 ThrowCannotReadString(); |
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143 } |
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144 |
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145 chunks.AddChunk(buffer.c_str(), length); |
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146 break; |
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147 } |
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148 else if (code == SQL_SUCCESS_WITH_INFO) |
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149 { |
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150 // This is an intermediate chunk |
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151 if (isBinary) |
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152 { |
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153 chunks.AddChunk(buffer.c_str(), buffer.size()); |
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154 } |
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155 else |
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156 { |
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157 chunks.AddChunk(buffer.c_str(), buffer.size() - 1); |
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158 } |
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159 } |
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160 else |
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161 { |
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162 ThrowCannotReadString(); |
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163 } |
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164 } |
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165 |
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166 chunks.Flatten(target); |
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167 } |
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168 else |
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169 { |
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170 statement_.CheckCollision(dialect_); |
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171 ThrowCannotReadString(); |
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172 } |
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173 } |
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174 |
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175 |
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176 OdbcResult::OdbcResult(OdbcStatement& statement, |
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177 Dialect dialect) : |
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178 statement_(statement), |
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179 dialect_(dialect), |
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180 first_(true), |
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181 done_(false) |
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182 { |
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183 SQLSMALLINT count; |
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184 if (!SQL_SUCCEEDED(SQLNumResultCols(statement_.GetHandle(), &count))) |
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185 { |
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186 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database); |
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187 } |
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188 |
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189 types_.resize(count); |
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190 typeNames_.resize(count); |
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191 values_.resize(count); |
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192 |
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193 for (size_t i = 0; i < values_.size(); i++) |
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194 { |
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195 /** |
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196 * NB: Don't use "SQLDescribeCol()", as it is less flexible |
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197 * (cf. OMSSQL-7: "SQLDescribeParam()" doesn't work with |
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198 * encrypted columns) |
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199 **/ |
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200 |
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201 if (!SQL_SUCCEEDED(SQLColAttribute(statement_.GetHandle(), i + 1, SQL_DESC_TYPE, NULL, -1, NULL, &types_[i]))) |
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202 { |
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203 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database); |
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204 } |
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205 |
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206 SQLCHAR buffer[1024]; |
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207 SQLSMALLINT length; |
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208 |
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209 if (!SQL_SUCCEEDED(SQLColAttribute(statement_.GetHandle(), i + 1, SQL_DESC_TYPE_NAME, |
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210 buffer, sizeof(buffer) - 1, &length, NULL))) |
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211 { |
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212 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database); |
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213 } |
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214 |
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215 std::string name(reinterpret_cast<const char*>(buffer), length); |
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216 Orthanc::Toolbox::ToLowerCase(typeNames_[i], name); |
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217 } |
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218 } |
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219 |
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220 |
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221 OdbcResult::~OdbcResult() |
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222 { |
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223 for (size_t i = 0; i < values_.size(); i++) |
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224 { |
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225 if (values_[i] != NULL) |
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226 { |
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227 delete values_[i]; |
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228 } |
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229 } |
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230 |
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231 if (!first_ && |
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232 !SQL_SUCCEEDED(SQLCloseCursor(statement_.GetHandle()))) |
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233 { |
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234 LOG(WARNING) << "Cannot close the ODBC cursor: " << std::endl << statement_.FormatError(); |
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235 } |
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236 } |
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237 |
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238 |
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239 void OdbcResult::SetExpectedType(size_t field, |
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240 ValueType type) |
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241 { |
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242 if (field >= types_.size()) |
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243 { |
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244 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange); |
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245 } |
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246 else |
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247 { |
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248 // Ignore this information |
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249 } |
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250 } |
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251 |
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252 |
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253 bool OdbcResult::IsDone() const |
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254 { |
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255 const_cast<OdbcResult&>(*this).LoadFirst(); |
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256 return done_; |
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257 } |
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258 |
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259 |
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260 void OdbcResult::Next() |
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261 { |
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262 SQLRETURN code = SQLFetch(statement_.GetHandle()); |
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263 |
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264 if (code == SQL_NO_DATA) |
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265 { |
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266 done_ = true; |
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267 } |
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268 else if (code == SQL_SUCCESS) |
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269 { |
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270 done_ = false; |
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271 } |
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272 else |
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273 { |
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274 statement_.CheckCollision(dialect_); |
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275 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Cannot fetch new row"); |
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276 } |
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277 |
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278 assert(values_.size() == types_.size() && |
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279 values_.size() == typeNames_.size()); |
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280 |
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281 for (size_t i = 0; i < values_.size(); i++) |
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282 { |
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283 SQLLEN type = types_[i]; |
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284 const std::string& name = typeNames_[i]; |
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285 |
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286 if (done_) |
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287 { |
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288 SetValue(i, new NullValue); |
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289 } |
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290 else if (type == SQL_INTEGER) |
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291 { |
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292 int32_t value; |
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293 SQLLEN length; |
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294 if (SQL_SUCCEEDED(SQLGetData(statement_.GetHandle(), i + 1, SQL_INTEGER, &value, sizeof(value), &length))) |
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295 { |
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296 if (length == SQL_NULL_DATA) |
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297 { |
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298 SetValue(i, new NullValue); |
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299 } |
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300 else |
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301 { |
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302 SetValue(i, new Integer64Value(value)); |
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303 } |
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304 } |
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305 else |
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306 { |
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307 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Cannot get int32_t field"); |
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308 } |
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309 } |
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310 else if (type == SQL_BIGINT || |
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311 (dialect_ == Dialect_PostgreSQL && name == "bigserial")) |
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312 { |
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313 int64_t value; |
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314 SQLLEN length; |
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315 if (SQL_SUCCEEDED(SQLGetData(statement_.GetHandle(), i + 1, SQL_C_SBIGINT, &value, sizeof(value), &length))) |
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316 { |
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317 if (length == SQL_NULL_DATA) |
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318 { |
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319 SetValue(i, new NullValue); |
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320 } |
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321 else |
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322 { |
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323 SetValue(i, new Integer64Value(value)); |
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324 } |
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325 } |
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326 else |
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327 { |
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328 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Cannot get int64_t field"); |
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329 } |
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330 } |
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331 else if (type == SQL_VARCHAR || |
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332 name == "varchar" || |
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333 (dialect_ == Dialect_MSSQL && name == "nvarchar") || // This means UTF-16 |
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334 (dialect_ == Dialect_MySQL && name == "longtext") || |
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335 (dialect_ == Dialect_MySQL && name.empty() && type == -9) || // Seen in "SQLTables()" |
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336 (dialect_ == Dialect_PostgreSQL && name == "text") || |
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337 (dialect_ == Dialect_SQLite && name == "text") || |
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338 (dialect_ == Dialect_SQLite && name == "wvarchar")) // Seen on Windows with sqliteodbc-0.9998-win32.exe |
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339 { |
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340 std::string value; |
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341 ReadString(value, i, false /* not binary */); |
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342 SetValue(i, new Utf8StringValue(value)); |
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343 } |
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344 else if (type == SQL_NUMERIC) |
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345 { |
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346 /** |
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347 * SQL_NUMERIC_STRUCT could be used here, but is much more |
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348 * complex to deal with: |
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349 * https://stackoverflow.com/a/9188737/881731 |
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350 **/ |
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351 |
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352 std::string value; |
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353 ReadString(value, i, false /* not binary */); |
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354 SetValue(i, new Integer64Value(boost::lexical_cast<int64_t>(value))); |
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355 } |
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356 else if (type == SQL_BINARY || |
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357 (dialect_ == Dialect_PostgreSQL && name == "bytea") || |
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358 (dialect_ == Dialect_MySQL && name == "longblob") || |
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359 (dialect_ == Dialect_MSSQL && name == "varbinary")) |
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360 { |
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361 std::string value; |
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362 ReadString(value, i, true /* binary */); |
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363 SetValue(i, new BinaryStringValue(value)); |
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364 } |
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365 else |
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366 { |
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367 throw Orthanc::OrthancException( |
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368 Orthanc::ErrorCode_NotImplemented, |
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369 "Unknown type in result: " + name + " (" + boost::lexical_cast<std::string>(type) + ")"); |
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370 } |
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371 } |
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372 } |
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373 |
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374 |
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375 const IValue& OdbcResult::GetField(size_t field) const |
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376 { |
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377 if (field >= values_.size()) |
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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 else if (IsDone()) |
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382 { |
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383 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls); |
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384 } |
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385 else if (values_[field] == NULL) |
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386 { |
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387 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); |
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388 } |
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389 else |
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390 { |
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391 return *values_[field]; |
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392 } |
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393 } |
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394 } |