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annotate Framework/Odbc/OdbcResult.cpp @ 359:16aac0287485

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copyright upgraded to 2022
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 21 Feb 2022 09:32:46 +0100
parents b5fb8b77ce4d
children 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
359
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5 * Copyright (C) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 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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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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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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diff changeset
351
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diff changeset
352 std::string value;
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353 ReadString(value, i, false /* not binary */);
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diff changeset
354 SetValue(i, new Integer64Value(boost::lexical_cast<int64_t>(value)));
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diff changeset
355 }
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diff changeset
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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diff changeset
360 {
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diff changeset
361 std::string value;
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diff changeset
362 ReadString(value, i, true /* binary */);
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diff changeset
363 SetValue(i, new BinaryStringValue(value));
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parents:
diff changeset
364 }
b5fb8b77ce4d initial commit of ODBC framework
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parents:
diff changeset
365 else
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parents:
diff changeset
366 {
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diff changeset
367 throw Orthanc::OrthancException(
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
368 Orthanc::ErrorCode_NotImplemented,
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
369 "Unknown type in result: " + name + " (" + boost::lexical_cast<std::string>(type) + ")");
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diff changeset
370 }
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parents:
diff changeset
371 }
b5fb8b77ce4d initial commit of ODBC framework
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parents:
diff changeset
372 }
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parents:
diff changeset
373
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parents:
diff changeset
374
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diff changeset
375 const IValue& OdbcResult::GetField(size_t field) const
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diff changeset
376 {
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parents:
diff changeset
377 if (field >= values_.size())
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parents:
diff changeset
378 {
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
379 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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diff changeset
380 }
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parents:
diff changeset
381 else if (IsDone())
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parents:
diff changeset
382 {
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
383 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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diff changeset
384 }
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diff changeset
385 else if (values_[field] == NULL)
b5fb8b77ce4d initial commit of ODBC framework
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parents:
diff changeset
386 {
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
387 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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parents:
diff changeset
388 }
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parents:
diff changeset
389 else
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parents:
diff changeset
390 {
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diff changeset
391 return *values_[field];
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parents:
diff changeset
392 }
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parents:
diff changeset
393 }
b5fb8b77ce4d initial commit of ODBC framework
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parents:
diff changeset
394 }