Mercurial > hg > orthanc-databases
annotate Framework/Common/DatabaseManager.h @ 241:a063bbf10a3e
simplification of class DatabaseManager::Transaction
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 13 Apr 2021 12:07:30 +0200 |
parents | 35598014f140 |
children | 8a4ce70f456a |
rev | line source |
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0 | 1 /** |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
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5 * Copyright (C) 2017-2021 Osimis S.A., Belgium |
0 | 6 * |
7 * This program is free software: you can redistribute it and/or | |
8 * modify it under the terms of the GNU Affero General Public License | |
9 * as published by the Free Software Foundation, either version 3 of | |
10 * the License, or (at your option) any later version. | |
11 * | |
12 * This program is distributed in the hope that it will be useful, but | |
13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 * Affero General Public License for more details. | |
16 * | |
17 * You should have received a copy of the GNU Affero General Public License | |
18 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 **/ | |
20 | |
21 | |
22 #pragma once | |
23 | |
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24 #include "IDatabase.h" |
0 | 25 #include "StatementLocation.h" |
26 | |
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27 #include <Compatibility.h> // For std::unique_ptr<> |
152 | 28 #include <Enumerations.h> |
0 | 29 |
30 #include <memory> | |
31 | |
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32 |
0 | 33 namespace OrthancDatabases |
34 { | |
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35 /** |
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36 * WARNING: In PostgreSQL releases <= 3.3 and in MySQL releases <= |
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37 * 3.0, this class was protected by a mutex. It is now assumed that |
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38 * locking must be implemented at a higher level. |
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39 * |
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40 * This class maintains a list of precompiled statements. At any |
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41 * time, this class handles 0 or 1 active transaction. |
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42 **/ |
0 | 43 class DatabaseManager : public boost::noncopyable |
44 { | |
45 private: | |
46 typedef std::map<StatementLocation, IPrecompiledStatement*> CachedStatements; | |
47 | |
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48 std::unique_ptr<IDatabase> database_; |
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49 std::unique_ptr<ITransaction> transaction_; |
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50 CachedStatements cachedStatements_; |
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51 Dialect dialect_; |
0 | 52 |
53 void CloseIfUnavailable(Orthanc::ErrorCode e); | |
54 | |
55 IPrecompiledStatement* LookupCachedStatement(const StatementLocation& location) const; | |
56 | |
57 IPrecompiledStatement& CacheStatement(const StatementLocation& location, | |
58 const Query& query); | |
59 | |
60 ITransaction& GetTransaction(); | |
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61 |
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62 void ReleaseImplicitTransaction(); |
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63 |
0 | 64 public: |
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65 explicit DatabaseManager(IDatabase* database); // Takes ownership |
0 | 66 |
67 ~DatabaseManager() | |
68 { | |
69 Close(); | |
70 } | |
71 | |
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72 IDatabase& GetDatabase() |
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73 { |
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74 return *database_; |
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75 } |
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76 |
0 | 77 Dialect GetDialect() const |
78 { | |
79 return dialect_; | |
80 } | |
81 | |
82 void Close(); | |
83 | |
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84 void StartTransaction(TransactionType type); |
0 | 85 |
86 void CommitTransaction(); | |
87 | |
88 void RollbackTransaction(); | |
89 | |
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90 |
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91 // This class is only used in the "StorageBackend" and in |
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92 // "IDatabaseBackend::ConfigureDatabase()" |
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93 class Transaction : public boost::noncopyable |
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94 { |
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95 private: |
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96 DatabaseManager& manager_; |
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97 IDatabase& database_; |
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98 bool active_; |
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99 |
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100 public: |
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101 explicit Transaction(DatabaseManager& manager, |
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102 TransactionType type); |
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103 |
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104 ~Transaction(); |
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105 |
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106 void Commit(); |
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107 |
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108 void Rollback(); |
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109 |
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110 /** |
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111 * WARNING: Don't call "GetDatabaseTransaction().Commit()" and |
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112 * "GetDatabaseTransaction().Rollback()", but use the "Commit()" |
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113 * and "Rollback()" methods above. |
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114 **/ |
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115 ITransaction& GetDatabaseTransaction() |
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116 { |
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117 return manager_.GetTransaction(); |
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118 } |
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119 }; |
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120 |
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121 |
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122 class StatementBase : public boost::noncopyable |
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124 private: | |
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125 DatabaseManager& manager_; |
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126 ITransaction& transaction_; |
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127 std::unique_ptr<Query> query_; |
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128 std::unique_ptr<IResult> result_; |
0 | 129 |
130 IResult& GetResult() const; | |
131 | |
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132 protected: |
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133 DatabaseManager& GetManager() const |
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134 { |
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135 return manager_; |
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136 } |
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137 |
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138 ITransaction& GetTransaction() const |
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139 { |
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140 return transaction_; |
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141 } |
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142 |
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143 void SetQuery(Query* query); |
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144 |
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145 void SetResult(IResult* result); |
0 | 146 |
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147 void ClearResult() |
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148 { |
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149 result_.reset(); |
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150 } |
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151 |
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152 Query* ReleaseQuery() |
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153 { |
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154 return query_.release(); |
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155 } |
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156 |
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157 public: |
96 | 158 explicit StatementBase(DatabaseManager& manager); |
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159 |
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160 virtual ~StatementBase(); |
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161 |
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162 // Used only by SQLite |
18 | 163 IDatabase& GetDatabase() |
164 { | |
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165 return manager_.GetDatabase(); |
18 | 166 } |
167 | |
0 | 168 void SetReadOnly(bool readOnly); |
169 | |
170 void SetParameterType(const std::string& parameter, | |
171 ValueType type); | |
172 | |
173 bool IsDone() const; | |
174 | |
175 void Next(); | |
176 | |
177 size_t GetResultFieldsCount() const; | |
178 | |
179 void SetResultFieldType(size_t field, | |
180 ValueType type); | |
181 | |
182 const IValue& GetResultField(size_t index) const; | |
183 }; | |
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184 |
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185 |
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186 class CachedStatement : public StatementBase |
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187 { |
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188 private: |
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189 StatementLocation location_; |
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190 IPrecompiledStatement* statement_; |
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191 |
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192 public: |
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193 CachedStatement(const StatementLocation& location, |
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194 DatabaseManager& manager, |
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195 const std::string& sql); |
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196 |
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197 void Execute() |
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198 { |
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199 Dictionary parameters; |
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200 Execute(parameters); |
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201 } |
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202 |
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203 void Execute(const Dictionary& parameters); |
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204 }; |
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205 |
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206 |
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207 class StandaloneStatement : public StatementBase |
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208 { |
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209 private: |
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210 std::unique_ptr<IPrecompiledStatement> statement_; |
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211 |
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212 public: |
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213 StandaloneStatement(DatabaseManager& manager, |
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214 const std::string& sql); |
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215 |
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216 virtual ~StandaloneStatement(); |
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217 |
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218 void Execute() |
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219 { |
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220 Dictionary parameters; |
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221 Execute(parameters); |
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222 } |
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223 |
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224 void Execute(const Dictionary& parameters); |
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225 }; |
0 | 226 }; |
227 } |