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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 *
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4 * Copyright (C) 2012-2015 Sebastien Jodogne <s.jodogne@gmail.com>,
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5 * Medical Physics Department, CHU of Liege, Belgium
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6 *
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7 * Copyright (c) 2012 The Chromium Authors. All rights reserved.
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8 *
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9 * Redistribution and use in source and binary forms, with or without
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10 * modification, are permitted provided that the following conditions are
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11 * met:
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12 *
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13 * * Redistributions of source code must retain the above copyright
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14 * notice, this list of conditions and the following disclaimer.
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15 * * Redistributions in binary form must reproduce the above
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16 * copyright notice, this list of conditions and the following disclaimer
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17 * in the documentation and/or other materials provided with the
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18 * distribution.
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19 * * Neither the name of Google Inc., the name of the CHU of Liege,
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20 * nor the names of its contributors may be used to endorse or promote
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21 * products derived from this software without specific prior written
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22 * permission.
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23 *
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24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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25 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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27 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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28 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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34 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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35 **/
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36
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37
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38 #pragma once
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39
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40 #include "Statement.h"
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41 #include "IScalarFunction.h"
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42
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43 #include <string>
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44 #include <map>
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45
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46 struct sqlite3;
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47 struct sqlite3_stmt;
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48
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49 #define SQLITE_FROM_HERE SQLite::StatementId(__FILE__, __LINE__)
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50
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51 namespace Orthanc
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52 {
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53 namespace SQLite
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54 {
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55 class Connection : NonCopyable
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56 {
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57 friend class Statement;
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58 friend class Transaction;
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59
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60 private:
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61 // All cached statements. Keeping a reference to these statements means that
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62 // they'll remain active.
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63 typedef std::map<StatementId, StatementReference*> CachedStatements;
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64 CachedStatements cachedStatements_;
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65
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66 // The actual sqlite database. Will be NULL before Init has been called or if
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67 // Init resulted in an error.
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68 sqlite3* db_;
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69
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70 // Number of currently-nested transactions.
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71 int transactionNesting_;
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72
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73 // True if any of the currently nested transactions have been rolled back.
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74 // When we get to the outermost transaction, this will determine if we do
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75 // a rollback instead of a commit.
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76 bool needsRollback_;
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77
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78 void ClearCache();
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79
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80 void CheckIsOpen() const;
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81
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82 sqlite3* GetWrappedObject()
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83 {
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84 return db_;
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85 }
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86
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87 StatementReference& GetCachedStatement(const StatementId& id,
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88 const char* sql);
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89
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90 bool DoesTableOrIndexExist(const char* name,
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91 const char* type) const;
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92
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93 void DoRollback();
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94
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95 public:
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96 // The database is opened by calling Open[InMemory](). Any uncommitted
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97 // transactions will be rolled back when this object is deleted.
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98 Connection();
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99 ~Connection();
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100
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101 void Open(const std::string& path);
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102
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103 void OpenInMemory();
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104
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105 void Close();
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106
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107 bool Execute(const char* sql);
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108
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109 bool Execute(const std::string& sql)
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110 {
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111 return Execute(sql.c_str());
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112 }
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113
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114 void FlushToDisk();
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115
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116 IScalarFunction* Register(IScalarFunction* func); // Takes the ownership of the function
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117
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118 // Info querying -------------------------------------------------------------
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119
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120 // Used to check a |sql| statement for syntactic validity. If the
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121 // statement is valid SQL, returns true.
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122 bool IsSQLValid(const char* sql);
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123
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124 // Returns true if the given table exists.
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125 bool DoesTableExist(const char* table_name) const;
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126
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127 // Returns true if the given index exists.
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128 bool DoesIndexExist(const char* index_name) const;
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129
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130 // Returns true if a column with the given name exists in the given table.
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131 bool DoesColumnExist(const char* table_name, const char* column_name) const;
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132
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133 // Returns sqlite's internal ID for the last inserted row. Valid only
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134 // immediately after an insert.
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135 int64_t GetLastInsertRowId() const;
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136
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137 // Returns sqlite's count of the number of rows modified by the last
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138 // statement executed. Will be 0 if no statement has executed or the database
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139 // is closed.
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140 int GetLastChangeCount() const;
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141
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142 // Errors --------------------------------------------------------------------
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143
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144 // Returns the error code associated with the last sqlite operation.
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145 int GetErrorCode() const;
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146
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147 // Returns the errno associated with GetErrorCode(). See
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148 // SQLITE_LAST_ERRNO in SQLite documentation.
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149 int GetLastErrno() const;
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150
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151 // Returns a pointer to a statically allocated string associated with the
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152 // last sqlite operation.
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153 const char* GetErrorMessage() const;
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154
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155
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156 // Diagnostics (for unit tests) ----------------------------------------------
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157
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158 int ExecuteAndReturnErrorCode(const char* sql);
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159
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160 bool HasCachedStatement(const StatementId& id) const
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161 {
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162 return cachedStatements_.find(id) != cachedStatements_.end();
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163 }
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164
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165 int GetTransactionNesting() const
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166 {
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167 return transactionNesting_;
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168 }
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169
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170 // Transactions --------------------------------------------------------------
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171
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172 bool BeginTransaction();
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173 void RollbackTransaction();
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174 bool CommitTransaction();
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175 };
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176 }
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177 }
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