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1 /**
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2 * Palanthir - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012 Medical Physics Department, CHU of Liege,
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4 * Belgium
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5 *
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6 * Copyright (c) 2012 The Chromium Authors. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions are
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10 * met:
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11 *
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12 * * Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 * * Redistributions in binary form must reproduce the above
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15 * copyright notice, this list of conditions and the following disclaimer
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16 * in the documentation and/or other materials provided with the
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17 * distribution.
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18 * * Neither the name of Google Inc., the name of the CHU of Liege,
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19 * nor the names of its contributors may be used to endorse or promote
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20 * products derived from this software without specific prior written
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21 * permission.
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22 *
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23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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27 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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29 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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34 **/
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35
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36
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37 #include "Connection.h"
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38
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39 #include <memory>
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40 #include <cassert>
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41 #include <sqlite3.h>
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42 #include <string.h>
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43
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44
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45
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46 namespace Palanthir
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47 {
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48 namespace SQLite
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49 {
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50 Connection::Connection() :
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51 db_(NULL),
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52 transactionNesting_(0),
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53 needsRollback_(false)
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54 {
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55 }
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56
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57
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58 Connection::~Connection()
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59 {
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60 Close();
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61 }
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62
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63
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64 void Connection::CheckIsOpen() const
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65 {
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66 if (!db_)
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67 {
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68 throw PalanthirException("SQLite: The database is not opened");
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69 }
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70 }
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71
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72 void Connection::Open(const std::string& path)
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73 {
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74 if (db_)
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75 {
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76 throw PalanthirException("SQLite: Connection is already open");
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77 }
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78
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79 int err = sqlite3_open(path.c_str(), &db_);
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80 if (err != SQLITE_OK)
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81 {
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82 Close();
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83 db_ = NULL;
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84 throw PalanthirException("SQLite: Unable to open the database");
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85 }
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86
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87 // Execute PRAGMAs at this point
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88 // http://www.sqlite.org/pragma.html
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89 Execute("PRAGMA FOREIGN_KEYS=ON;");
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90
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91 // Performance tuning
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92 Execute("PRAGMA SYNCHRONOUS=NORMAL;");
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93 Execute("PRAGMA JOURNAL_MODE=WAL;");
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94 Execute("PRAGMA LOCKING_MODE=EXCLUSIVE;");
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95 Execute("PRAGMA WAL_AUTOCHECKPOINT=1000;");
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96 //Execute("PRAGMA TEMP_STORE=memory");
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97 }
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98
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99 void Connection::OpenInMemory()
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100 {
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101 Open(":memory:");
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102 }
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103
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104 void Connection::Close()
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105 {
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106 ClearCache();
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107
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108 if (db_)
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109 {
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110 sqlite3_close(db_);
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111 db_ = NULL;
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112 }
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113 }
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114
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115 void Connection::ClearCache()
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116 {
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117 for (CachedStatements::iterator
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118 it = cachedStatements_.begin();
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119 it != cachedStatements_.end(); it++)
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120 {
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121 delete it->second;
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122 }
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123
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124 cachedStatements_.clear();
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125 }
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126
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127
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128 StatementReference& Connection::GetCachedStatement(const StatementId& id,
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129 const char* sql)
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130 {
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131 CachedStatements::iterator i = cachedStatements_.find(id);
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132 if (i != cachedStatements_.end())
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133 {
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134 if (i->second->GetReferenceCount() >= 1)
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135 {
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136 throw PalanthirException("SQLite: This cached statement is already being referred to");
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137 }
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138
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139 return *i->second;
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140 }
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141 else
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142 {
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143 StatementReference* statement = new StatementReference(db_, sql);
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144 cachedStatements_[id] = statement;
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145 return *statement;
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146 }
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147 }
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148
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149
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150 bool Connection::Execute(const char* sql)
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151 {
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152 CheckIsOpen();
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153
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154 int error = sqlite3_exec(db_, sql, NULL, NULL, NULL);
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155 if (error == SQLITE_ERROR)
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156 {
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157 throw PalanthirException("SQLite Execute error: " + std::string(sqlite3_errmsg(db_)));
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158 }
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159 else
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160 {
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161 return error == SQLITE_OK;
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162 }
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163 }
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164
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165 int Connection::ExecuteAndReturnErrorCode(const char* sql)
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166 {
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167 CheckIsOpen();
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168 return sqlite3_exec(db_, sql, NULL, NULL, NULL);
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169 }
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170
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171 // Info querying -------------------------------------------------------------
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172
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173 bool Connection::IsSQLValid(const char* sql)
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174 {
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175 sqlite3_stmt* stmt = NULL;
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176 if (sqlite3_prepare_v2(db_, sql, -1, &stmt, NULL) != SQLITE_OK)
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177 return false;
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178
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179 sqlite3_finalize(stmt);
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180 return true;
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181 }
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182
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183 bool Connection::DoesTableOrIndexExist(const char* name,
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184 const char* type) const
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185 {
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186 // Our SQL is non-mutating, so this cast is OK.
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187 Statement statement(const_cast<Connection&>(*this),
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188 "SELECT name FROM sqlite_master WHERE type=? AND name=?");
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189 statement.BindString(0, type);
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190 statement.BindString(1, name);
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191 return statement.Step(); // Table exists if any row was returned.
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192 }
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193
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194 bool Connection::DoesTableExist(const char* table_name) const
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195 {
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196 return DoesTableOrIndexExist(table_name, "table");
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197 }
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198
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199 bool Connection::DoesIndexExist(const char* index_name) const
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200 {
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201 return DoesTableOrIndexExist(index_name, "index");
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202 }
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203
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204 bool Connection::DoesColumnExist(const char* table_name, const char* column_name) const
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205 {
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206 std::string sql("PRAGMA TABLE_INFO(");
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207 sql.append(table_name);
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208 sql.append(")");
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209
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210 // Our SQL is non-mutating, so this cast is OK.
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211 Statement statement(const_cast<Connection&>(*this), sql.c_str());
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212
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213 while (statement.Step()) {
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214 if (!statement.ColumnString(1).compare(column_name))
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215 return true;
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216 }
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217 return false;
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218 }
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219
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220 int64_t Connection::GetLastInsertRowId() const
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221 {
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222 return sqlite3_last_insert_rowid(db_);
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223 }
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224
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225 int Connection::GetLastChangeCount() const
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226 {
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227 return sqlite3_changes(db_);
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228 }
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229
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230 int Connection::GetErrorCode() const
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231 {
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232 return sqlite3_errcode(db_);
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233 }
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234
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235 int Connection::GetLastErrno() const
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236 {
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237 int err = 0;
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238 if (SQLITE_OK != sqlite3_file_control(db_, NULL, SQLITE_LAST_ERRNO, &err))
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239 return -2;
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240
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241 return err;
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242 }
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243
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244 const char* Connection::GetErrorMessage() const
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245 {
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246 return sqlite3_errmsg(db_);
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247 }
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248
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249
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250 bool Connection::BeginTransaction()
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251 {
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252 if (needsRollback_)
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253 {
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254 assert(transactionNesting_ > 0);
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255
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256 // When we're going to rollback, fail on this begin and don't actually
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257 // mark us as entering the nested transaction.
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258 return false;
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259 }
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260
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261 bool success = true;
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262 if (!transactionNesting_)
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263 {
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264 needsRollback_ = false;
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265
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266 Statement begin(*this, SQLITE_FROM_HERE, "BEGIN TRANSACTION");
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267 if (!begin.Run())
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268 return false;
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269 }
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270 transactionNesting_++;
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271 return success;
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272 }
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273
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274 void Connection::RollbackTransaction()
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275 {
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276 if (!transactionNesting_)
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277 {
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278 throw PalanthirException("Rolling back a nonexistent transaction");
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279 }
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280
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281 transactionNesting_--;
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282
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283 if (transactionNesting_ > 0)
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284 {
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285 // Mark the outermost transaction as needing rollback.
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286 needsRollback_ = true;
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287 return;
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288 }
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289
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290 DoRollback();
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291 }
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292
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293 bool Connection::CommitTransaction()
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294 {
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295 if (!transactionNesting_)
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296 {
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297 throw PalanthirException("Committing a nonexistent transaction");
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298 }
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299 transactionNesting_--;
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300
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301 if (transactionNesting_ > 0)
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302 {
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303 // Mark any nested transactions as failing after we've already got one.
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304 return !needsRollback_;
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305 }
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306
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307 if (needsRollback_)
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308 {
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309 DoRollback();
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310 return false;
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311 }
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312
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313 Statement commit(*this, SQLITE_FROM_HERE, "COMMIT");
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314 return commit.Run();
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315 }
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316
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317 void Connection::DoRollback()
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318 {
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319 Statement rollback(*this, SQLITE_FROM_HERE, "ROLLBACK");
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320 rollback.Run();
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321 needsRollback_ = false;
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322 }
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323
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324
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325
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326
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327
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328
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329 static void ScalarFunctionCaller(sqlite3_context* rawContext,
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330 int argc,
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331 sqlite3_value** argv)
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332 {
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333 FunctionContext context(rawContext, argc, argv);
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334
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335 void* payload = sqlite3_user_data(rawContext);
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336 assert(payload != NULL);
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337
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338 IScalarFunction& func = *(IScalarFunction*) payload;
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339 func.Compute(context);
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340 }
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341
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342
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343 static void ScalarFunctionDestroyer(void* payload)
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344 {
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345 assert(payload != NULL);
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346 delete (IScalarFunction*) payload;
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347 }
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348
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349
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350 IScalarFunction* Connection::Register(IScalarFunction* func)
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351 {
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352 int err = sqlite3_create_function_v2(db_,
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353 func->GetName(),
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354 func->GetCardinality(),
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355 SQLITE_UTF8,
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356 func,
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357 ScalarFunctionCaller,
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358 NULL,
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359 NULL,
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360 ScalarFunctionDestroyer);
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361
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362 if (err != SQLITE_OK)
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363 {
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364 delete func;
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365 throw PalanthirException("SQLite: Unable to register a function");
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366 }
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367
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368 return func;
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369 }
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370
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371 }
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372 }
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