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annotate Framework/Odbc/OdbcResult.cpp @ 522:c49136b34891 large-queries tip

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author Alain Mazy <am@orthanc.team>
date Fri, 05 Jul 2024 09:15:54 +0200
parents 54d518dcd74a
children
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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) 2024-2024 Orthanc Team SRL, Belgium
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ecd0b719cff5 update year to 2024
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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8 *
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9 * This program is free software: you can redistribute it and/or
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10 * modify it under the terms of the GNU Affero General Public License
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11 * as published by the Free Software Foundation, either version 3 of
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12 * the License, or (at your option) any later version.
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13 *
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14 * This program is distributed in the hope that it will be useful, but
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 * Affero General Public License for more details.
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18 *
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19 * You should have received a copy of the GNU Affero General Public License
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20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "OdbcResult.h"
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25
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26 #include "../Common/BinaryStringValue.h"
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27 #include "../Common/Integer64Value.h"
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28 #include "../Common/NullValue.h"
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29 #include "../Common/Utf8StringValue.h"
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30
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31 #include <ChunkedBuffer.h>
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32 #include <Logging.h>
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33 #include <OrthancException.h>
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34 #include <Toolbox.h>
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35
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36 #include <boost/lexical_cast.hpp>
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37 #include <sqlext.h>
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38
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40 namespace OrthancDatabases
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41 {
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42 static void ThrowCannotReadString()
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43 {
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44 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Cannot read text field");
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45 }
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47
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48 void OdbcResult::LoadFirst()
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49 {
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50 if (first_)
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51 {
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52 Next();
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53 first_ = false;
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54 }
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55 }
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57
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58 void OdbcResult::SetValue(size_t index,
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59 IValue* value)
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60 {
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61 std::unique_ptr<IValue> raii(value);
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62
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63 if (index >= values_.size())
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64 {
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65 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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66 }
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67 else if (value == NULL)
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68 {
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69 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
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70 }
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71 else
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72 {
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73 if (values_[index] != NULL)
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74 {
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75 delete values_[index];
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76 }
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77
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78 values_[index] = raii.release();
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79 }
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80 }
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81
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82
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83 void OdbcResult::ReadString(std::string& target,
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84 size_t column,
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85 bool isBinary)
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86 {
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87 // https://docs.microsoft.com/en-us/sql/odbc/reference/develop-app/getting-long-data
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88
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89 std::string buffer;
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90 buffer.resize(1024 * 1024);
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91
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92 const SQLSMALLINT targetType = (isBinary ? SQL_BINARY : SQL_C_CHAR);
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93
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94 SQLLEN length;
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95 SQLRETURN code = SQLGetData(statement_.GetHandle(), column + 1, targetType, &buffer[0], buffer.size(), &length);
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96 if (code == SQL_NO_DATA)
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97 {
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98 target.clear();
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99 }
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100 else if (code == SQL_SUCCESS)
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101 {
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102 if (length == -1)
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103 {
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104 target.clear(); // No data available
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105 }
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106 else
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107 {
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108 // The "buffer" was large enough to store the text value, plus the null termination
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109 target.assign(buffer.c_str(), length);
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110 }
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111 }
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112 else if (code == SQL_SUCCESS_WITH_INFO)
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113 {
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114 Orthanc::ChunkedBuffer chunks;
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115
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116 if (isBinary)
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117 {
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118 chunks.AddChunk(buffer.c_str(), buffer.size());
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119 }
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120 else
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121 {
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122 /**
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123 * WARNING: At this point, in the MSSQL driver, "length"
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124 * contains the number of Unicode characters! This is
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125 * different from the actual number of **bytes** that are
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126 * required to store the UTF-8 string. As a consequence, the
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127 * "length" cannot be used to determine the final size of
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128 * the "target" string.
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129 **/
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130 chunks.AddChunk(buffer.c_str(), buffer.size() - 1);
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131 }
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132
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133 for (;;)
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134 {
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135 code = SQLGetData(statement_.GetHandle(), column + 1, targetType, &buffer[0], buffer.size(), &length);
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136
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137 if (code == SQL_SUCCESS)
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138 {
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139 // This is the last chunk
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140 if (length == 0 ||
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141 length > static_cast<SQLLEN>(buffer.size()))
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142 {
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143 ThrowCannotReadString();
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144 }
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145
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146 chunks.AddChunk(buffer.c_str(), length);
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147 break;
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148 }
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149 else if (code == SQL_SUCCESS_WITH_INFO)
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150 {
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151 // This is an intermediate chunk
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152 if (isBinary)
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153 {
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154 chunks.AddChunk(buffer.c_str(), buffer.size());
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155 }
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156 else
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157 {
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158 chunks.AddChunk(buffer.c_str(), buffer.size() - 1);
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159 }
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160 }
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161 else
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162 {
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163 ThrowCannotReadString();
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164 }
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165 }
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166
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167 chunks.Flatten(target);
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168 }
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169 else
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170 {
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171 statement_.CheckCollision(dialect_);
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172 ThrowCannotReadString();
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173 }
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174 }
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175
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176
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177 OdbcResult::OdbcResult(OdbcStatement& statement,
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178 Dialect dialect) :
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179 statement_(statement),
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180 dialect_(dialect),
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181 first_(true),
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182 done_(false)
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183 {
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184 SQLSMALLINT count;
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185 if (!SQL_SUCCEEDED(SQLNumResultCols(statement_.GetHandle(), &count)))
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186 {
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187 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
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188 }
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189
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190 types_.resize(count);
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191 typeNames_.resize(count);
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192 values_.resize(count);
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193
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194 for (size_t i = 0; i < values_.size(); i++)
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195 {
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196 /**
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197 * NB: Don't use "SQLDescribeCol()", as it is less flexible
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198 * (cf. OMSSQL-7: "SQLDescribeParam()" doesn't work with
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199 * encrypted columns)
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200 **/
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201
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202 if (!SQL_SUCCEEDED(SQLColAttribute(statement_.GetHandle(), i + 1, SQL_DESC_TYPE, NULL, -1, NULL, &types_[i])))
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203 {
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204 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
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205 }
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206
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207 SQLCHAR buffer[1024];
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208 SQLSMALLINT length;
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209
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210 if (!SQL_SUCCEEDED(SQLColAttribute(statement_.GetHandle(), i + 1, SQL_DESC_TYPE_NAME,
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211 buffer, sizeof(buffer) - 1, &length, NULL)))
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212 {
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213 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
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214 }
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215
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216 std::string name(reinterpret_cast<const char*>(buffer), length);
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217 Orthanc::Toolbox::ToLowerCase(typeNames_[i], name);
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218 }
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219 }
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220
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221
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222 OdbcResult::~OdbcResult()
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223 {
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224 for (size_t i = 0; i < values_.size(); i++)
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225 {
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226 if (values_[i] != NULL)
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227 {
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228 delete values_[i];
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229 }
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230 }
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231
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232 if (!first_ &&
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233 !SQL_SUCCEEDED(SQLCloseCursor(statement_.GetHandle())))
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234 {
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235 LOG(WARNING) << "Cannot close the ODBC cursor: " << std::endl << statement_.FormatError();
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236 }
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237 }
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238
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239
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240 void OdbcResult::SetExpectedType(size_t field,
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241 ValueType type)
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242 {
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243 if (field >= types_.size())
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244 {
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245 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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246 }
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247 else
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248 {
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249 // Ignore this information
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250 }
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251 }
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252
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253
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254 bool OdbcResult::IsDone() const
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255 {
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256 const_cast<OdbcResult&>(*this).LoadFirst();
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257 return done_;
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258 }
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259
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260
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261 void OdbcResult::Next()
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262 {
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263 SQLRETURN code = SQLFetch(statement_.GetHandle());
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264
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265 if (code == SQL_NO_DATA)
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266 {
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267 done_ = true;
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268 }
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269 else if (code == SQL_SUCCESS)
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270 {
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271 done_ = false;
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272 }
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273 else
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274 {
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275 statement_.CheckCollision(dialect_);
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276 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Cannot fetch new row");
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277 }
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278
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279 assert(values_.size() == types_.size() &&
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280 values_.size() == typeNames_.size());
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281
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282 for (size_t i = 0; i < values_.size(); i++)
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283 {
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284 SQLLEN type = types_[i];
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285 const std::string& name = typeNames_[i];
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286
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287 if (done_)
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288 {
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289 SetValue(i, new NullValue);
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290 }
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291 else if (type == SQL_INTEGER)
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292 {
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293 int32_t value;
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294 SQLLEN length;
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295 if (SQL_SUCCEEDED(SQLGetData(statement_.GetHandle(), i + 1, SQL_INTEGER, &value, sizeof(value), &length)))
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296 {
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297 if (length == SQL_NULL_DATA)
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298 {
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299 SetValue(i, new NullValue);
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300 }
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301 else
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302 {
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303 SetValue(i, new Integer64Value(value));
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304 }
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305 }
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306 else
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307 {
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308 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Cannot get int32_t field");
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309 }
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310 }
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311 else if (type == SQL_BIGINT ||
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312 (dialect_ == Dialect_PostgreSQL && name == "bigserial"))
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313 {
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314 int64_t value;
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315 SQLLEN length;
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316 if (SQL_SUCCEEDED(SQLGetData(statement_.GetHandle(), i + 1, SQL_C_SBIGINT, &value, sizeof(value), &length)))
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317 {
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318 if (length == SQL_NULL_DATA)
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319 {
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320 SetValue(i, new NullValue);
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321 }
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322 else
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diff changeset
323 {
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324 SetValue(i, new Integer64Value(value));
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325 }
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326 }
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327 else
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328 {
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329 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database, "Cannot get int64_t field");
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330 }
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331 }
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332 else if (type == SQL_VARCHAR ||
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333 name == "varchar" ||
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334 (dialect_ == Dialect_MSSQL && name == "nvarchar") || // This means UTF-16
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335 (dialect_ == Dialect_MySQL && name == "longtext") ||
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336 (dialect_ == Dialect_MySQL && name.empty() && type == -9) || // Seen in "SQLTables()"
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337 (dialect_ == Dialect_PostgreSQL && name == "text") ||
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338 (dialect_ == Dialect_SQLite && name == "text") ||
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339 (dialect_ == Dialect_SQLite && name == "wvarchar")) // Seen on Windows with sqliteodbc-0.9998-win32.exe
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340 {
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341 std::string value;
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342 ReadString(value, i, false /* not binary */);
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diff changeset
343 SetValue(i, new Utf8StringValue(value));
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344 }
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345 else if (type == SQL_NUMERIC)
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346 {
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347 /**
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348 * SQL_NUMERIC_STRUCT could be used here, but is much more
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349 * complex to deal with:
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350 * https://stackoverflow.com/a/9188737/881731
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351 **/
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diff changeset
352
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diff changeset
353 std::string value;
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diff changeset
354 ReadString(value, i, false /* not binary */);
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diff changeset
355 SetValue(i, new Integer64Value(boost::lexical_cast<int64_t>(value)));
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diff changeset
356 }
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diff changeset
357 else if (type == SQL_BINARY ||
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diff changeset
358 (dialect_ == Dialect_PostgreSQL && name == "bytea") ||
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diff changeset
359 (dialect_ == Dialect_MySQL && name == "longblob") ||
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diff changeset
360 (dialect_ == Dialect_MSSQL && name == "varbinary"))
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parents:
diff changeset
361 {
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diff changeset
362 std::string value;
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
363 ReadString(value, i, true /* binary */);
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parents:
diff changeset
364 SetValue(i, new BinaryStringValue(value));
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parents:
diff changeset
365 }
b5fb8b77ce4d initial commit of ODBC framework
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parents:
diff changeset
366 else
b5fb8b77ce4d initial commit of ODBC framework
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parents:
diff changeset
367 {
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
368 throw Orthanc::OrthancException(
b5fb8b77ce4d initial commit of ODBC framework
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parents:
diff changeset
369 Orthanc::ErrorCode_NotImplemented,
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
370 "Unknown type in result: " + name + " (" + boost::lexical_cast<std::string>(type) + ")");
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parents:
diff changeset
371 }
b5fb8b77ce4d initial commit of ODBC framework
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parents:
diff changeset
372 }
b5fb8b77ce4d initial commit of ODBC framework
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parents:
diff changeset
373 }
b5fb8b77ce4d initial commit of ODBC framework
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
374
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
375
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parents:
diff changeset
376 const IValue& OdbcResult::GetField(size_t field) const
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diff changeset
377 {
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parents:
diff changeset
378 if (field >= values_.size())
b5fb8b77ce4d initial commit of ODBC framework
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parents:
diff changeset
379 {
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
380 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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parents:
diff changeset
381 }
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parents:
diff changeset
382 else if (IsDone())
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parents:
diff changeset
383 {
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
384 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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diff changeset
385 }
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parents:
diff changeset
386 else if (values_[field] == NULL)
b5fb8b77ce4d initial commit of ODBC framework
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parents:
diff changeset
387 {
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
388 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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parents:
diff changeset
389 }
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parents:
diff changeset
390 else
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parents:
diff changeset
391 {
b5fb8b77ce4d initial commit of ODBC framework
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diff changeset
392 return *values_[field];
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parents:
diff changeset
393 }
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parents:
diff changeset
394 }
b5fb8b77ce4d initial commit of ODBC framework
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parents:
diff changeset
395 }