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annotate Framework/Odbc/OdbcResult.cpp @ 329:b5fb8b77ce4d

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initial commit of ODBC framework
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 10 Aug 2021 20:08:53 +0200
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children 16aac0287485
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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) 2017-2021 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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22 #include "OdbcResult.h"
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23
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24 #include "../Common/BinaryStringValue.h"
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25 #include "../Common/Integer64Value.h"
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26 #include "../Common/NullValue.h"
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27 #include "../Common/Utf8StringValue.h"
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28
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29 #include <ChunkedBuffer.h>
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30 #include <Logging.h>
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31 #include <OrthancException.h>
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32 #include <Toolbox.h>
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33
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34 #include <boost/lexical_cast.hpp>
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35 #include <sqlext.h>
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36
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38 namespace OrthancDatabases
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39 {
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40 static void ThrowCannotReadString()
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41 {
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42 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Cannot read text field");
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43 }
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45
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46 void OdbcResult::LoadFirst()
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47 {
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48 if (first_)
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49 {
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50 Next();
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51 first_ = false;
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52 }
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53 }
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55
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56 void OdbcResult::SetValue(size_t index,
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57 IValue* value)
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58 {
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59 std::unique_ptr<IValue> raii(value);
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60
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61 if (index >= values_.size())
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62 {
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63 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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64 }
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65 else if (value == NULL)
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66 {
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67 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
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68 }
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69 else
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70 {
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71 if (values_[index] != NULL)
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72 {
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73 delete values_[index];
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74 }
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75
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76 values_[index] = raii.release();
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77 }
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78 }
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79
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80
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81 void OdbcResult::ReadString(std::string& target,
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82 size_t column,
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83 bool isBinary)
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84 {
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85 // https://docs.microsoft.com/en-us/sql/odbc/reference/develop-app/getting-long-data
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86
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87 std::string buffer;
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88 buffer.resize(1024 * 1024);
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89
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90 const SQLSMALLINT targetType = (isBinary ? SQL_BINARY : SQL_C_CHAR);
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91
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92 SQLLEN length;
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93 SQLRETURN code = SQLGetData(statement_.GetHandle(), column + 1, targetType, &buffer[0], buffer.size(), &length);
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94 if (code == SQL_NO_DATA)
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95 {
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96 target.clear();
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97 }
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98 else if (code == SQL_SUCCESS)
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99 {
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100 if (length == -1)
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101 {
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102 target.clear(); // No data available
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103 }
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104 else
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105 {
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106 // The "buffer" was large enough to store the text value, plus the null termination
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107 target.assign(buffer.c_str(), length);
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108 }
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109 }
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110 else if (code == SQL_SUCCESS_WITH_INFO)
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111 {
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112 Orthanc::ChunkedBuffer chunks;
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113
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114 if (isBinary)
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115 {
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116 chunks.AddChunk(buffer.c_str(), buffer.size());
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117 }
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118 else
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119 {
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120 /**
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121 * WARNING: At this point, in the MSSQL driver, "length"
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122 * contains the number of Unicode characters! This is
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123 * different from the actual number of **bytes** that are
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124 * required to store the UTF-8 string. As a consequence, the
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125 * "length" cannot be used to determine the final size of
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126 * the "target" string.
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127 **/
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128 chunks.AddChunk(buffer.c_str(), buffer.size() - 1);
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129 }
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130
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131 for (;;)
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132 {
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133 code = SQLGetData(statement_.GetHandle(), column + 1, targetType, &buffer[0], buffer.size(), &length);
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134
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135 if (code == SQL_SUCCESS)
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136 {
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137 // This is the last chunk
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138 if (length == 0 ||
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139 length > static_cast<SQLLEN>(buffer.size()))
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140 {
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141 ThrowCannotReadString();
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142 }
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143
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144 chunks.AddChunk(buffer.c_str(), length);
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145 break;
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146 }
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147 else if (code == SQL_SUCCESS_WITH_INFO)
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148 {
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149 // This is an intermediate chunk
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150 if (isBinary)
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151 {
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152 chunks.AddChunk(buffer.c_str(), buffer.size());
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153 }
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154 else
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155 {
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156 chunks.AddChunk(buffer.c_str(), buffer.size() - 1);
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157 }
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158 }
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159 else
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160 {
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161 ThrowCannotReadString();
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162 }
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163 }
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164
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165 chunks.Flatten(target);
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166 }
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167 else
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168 {
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169 statement_.CheckCollision(dialect_);
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170 ThrowCannotReadString();
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171 }
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172 }
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173
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174
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175 OdbcResult::OdbcResult(OdbcStatement& statement,
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176 Dialect dialect) :
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177 statement_(statement),
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178 dialect_(dialect),
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179 first_(true),
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180 done_(false)
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181 {
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182 SQLSMALLINT count;
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183 if (!SQL_SUCCEEDED(SQLNumResultCols(statement_.GetHandle(), &count)))
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184 {
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185 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
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186 }
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187
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188 types_.resize(count);
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189 typeNames_.resize(count);
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190 values_.resize(count);
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191
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192 for (size_t i = 0; i < values_.size(); i++)
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193 {
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194 /**
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195 * NB: Don't use "SQLDescribeCol()", as it is less flexible
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196 * (cf. OMSSQL-7: "SQLDescribeParam()" doesn't work with
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197 * encrypted columns)
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198 **/
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199
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200 if (!SQL_SUCCEEDED(SQLColAttribute(statement_.GetHandle(), i + 1, SQL_DESC_TYPE, NULL, -1, NULL, &types_[i])))
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201 {
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202 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
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203 }
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204
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205 SQLCHAR buffer[1024];
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206 SQLSMALLINT length;
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207
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208 if (!SQL_SUCCEEDED(SQLColAttribute(statement_.GetHandle(), i + 1, SQL_DESC_TYPE_NAME,
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209 buffer, sizeof(buffer) - 1, &length, NULL)))
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210 {
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211 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
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212 }
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213
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214 std::string name(reinterpret_cast<const char*>(buffer), length);
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215 Orthanc::Toolbox::ToLowerCase(typeNames_[i], name);
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216 }
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217 }
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218
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219
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220 OdbcResult::~OdbcResult()
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221 {
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222 for (size_t i = 0; i < values_.size(); i++)
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223 {
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224 if (values_[i] != NULL)
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225 {
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226 delete values_[i];
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227 }
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228 }
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229
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230 if (!first_ &&
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231 !SQL_SUCCEEDED(SQLCloseCursor(statement_.GetHandle())))
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232 {
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233 LOG(WARNING) << "Cannot close the ODBC cursor: " << std::endl << statement_.FormatError();
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234 }
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235 }
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236
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237
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238 void OdbcResult::SetExpectedType(size_t field,
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239 ValueType type)
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240 {
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241 if (field >= types_.size())
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242 {
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243 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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244 }
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245 else
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246 {
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247 // Ignore this information
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248 }
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249 }
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250
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251
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252 bool OdbcResult::IsDone() const
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253 {
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254 const_cast<OdbcResult&>(*this).LoadFirst();
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255 return done_;
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256 }
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257
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258
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259 void OdbcResult::Next()
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260 {
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261 SQLRETURN code = SQLFetch(statement_.GetHandle());
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262
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263 if (code == SQL_NO_DATA)
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264 {
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265 done_ = true;
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266 }
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267 else if (code == SQL_SUCCESS)
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268 {
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269 done_ = false;
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270 }
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271 else
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272 {
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273 statement_.CheckCollision(dialect_);
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274 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Cannot fetch new row");
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275 }
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276
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277 assert(values_.size() == types_.size() &&
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278 values_.size() == typeNames_.size());
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279
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280 for (size_t i = 0; i < values_.size(); i++)
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281 {
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282 SQLLEN type = types_[i];
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283 const std::string& name = typeNames_[i];
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284
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285 if (done_)
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286 {
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287 SetValue(i, new NullValue);
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288 }
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289 else if (type == SQL_INTEGER)
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290 {
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291 int32_t value;
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292 SQLLEN length;
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293 if (SQL_SUCCEEDED(SQLGetData(statement_.GetHandle(), i + 1, SQL_INTEGER, &value, sizeof(value), &length)))
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294 {
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295 if (length == SQL_NULL_DATA)
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296 {
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297 SetValue(i, new NullValue);
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298 }
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299 else
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300 {
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301 SetValue(i, new Integer64Value(value));
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302 }
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303 }
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304 else
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305 {
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306 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Cannot get int32_t field");
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307 }
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308 }
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309 else if (type == SQL_BIGINT ||
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310 (dialect_ == Dialect_PostgreSQL && name == "bigserial"))
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311 {
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312 int64_t value;
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313 SQLLEN length;
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314 if (SQL_SUCCEEDED(SQLGetData(statement_.GetHandle(), i + 1, SQL_C_SBIGINT, &value, sizeof(value), &length)))
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315 {
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316 if (length == SQL_NULL_DATA)
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317 {
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318 SetValue(i, new NullValue);
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319 }
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320 else
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321 {
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322 SetValue(i, new Integer64Value(value));
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323 }
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324 }
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325 else
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326 {
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327 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Cannot get int64_t field");
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328 }
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329 }
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330 else if (type == SQL_VARCHAR ||
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331 name == "varchar" ||
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332 (dialect_ == Dialect_MSSQL && name == "nvarchar") || // This means UTF-16
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333 (dialect_ == Dialect_MySQL && name == "longtext") ||
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334 (dialect_ == Dialect_MySQL && name.empty() && type == -9) || // Seen in "SQLTables()"
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335 (dialect_ == Dialect_PostgreSQL && name == "text") ||
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336 (dialect_ == Dialect_SQLite && name == "text") ||
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337 (dialect_ == Dialect_SQLite && name == "wvarchar")) // Seen on Windows with sqliteodbc-0.9998-win32.exe
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338 {
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339 std::string value;
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340 ReadString(value, i, false /* not binary */);
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341 SetValue(i, new Utf8StringValue(value));
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342 }
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343 else if (type == SQL_NUMERIC)
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344 {
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345 /**
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346 * SQL_NUMERIC_STRUCT could be used here, but is much more
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347 * complex to deal with:
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348 * https://stackoverflow.com/a/9188737/881731
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349 **/
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350
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351 std::string value;
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352 ReadString(value, i, false /* not binary */);
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353 SetValue(i, new Integer64Value(boost::lexical_cast<int64_t>(value)));
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354 }
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355 else if (type == SQL_BINARY ||
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356 (dialect_ == Dialect_PostgreSQL && name == "bytea") ||
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357 (dialect_ == Dialect_MySQL && name == "longblob") ||
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358 (dialect_ == Dialect_MSSQL && name == "varbinary"))
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diff changeset
359 {
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diff changeset
360 std::string value;
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diff changeset
361 ReadString(value, i, true /* binary */);
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diff changeset
362 SetValue(i, new BinaryStringValue(value));
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diff changeset
363 }
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diff changeset
364 else
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diff changeset
365 {
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diff changeset
366 throw Orthanc::OrthancException(
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diff changeset
367 Orthanc::ErrorCode_NotImplemented,
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
368 "Unknown type in result: " + name + " (" + boost::lexical_cast<std::string>(type) + ")");
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diff changeset
369 }
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parents:
diff changeset
370 }
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parents:
diff changeset
371 }
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parents:
diff changeset
372
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diff changeset
373
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diff changeset
374 const IValue& OdbcResult::GetField(size_t field) const
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375 {
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diff changeset
376 if (field >= values_.size())
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diff changeset
377 {
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diff changeset
378 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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diff changeset
379 }
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diff changeset
380 else if (IsDone())
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diff changeset
381 {
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diff changeset
382 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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diff changeset
383 }
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diff changeset
384 else if (values_[field] == NULL)
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diff changeset
385 {
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
386 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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parents:
diff changeset
387 }
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parents:
diff changeset
388 else
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parents:
diff changeset
389 {
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390 return *values_[field];
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diff changeset
391 }
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parents:
diff changeset
392 }
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parents:
diff changeset
393 }