Mercurial > hg > orthanc-databases
annotate Framework/Common/DatabaseManager.cpp @ 207:d9ef3f16e6a2
wrapping transactions in API v3
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Fri, 19 Mar 2021 15:11:45 +0100 |
| parents | 3236894320d6 |
| children | b40b30075c51 |
| rev | line source |
|---|---|
| 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 #include "DatabaseManager.h" | |
| 23 | |
| 152 | 24 #include "../../Resources/Orthanc/Plugins/OrthancPluginCppWrapper.h" |
| 116 | 25 |
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26 #include <Compatibility.h> // For std::unique_ptr<> |
| 152 | 27 #include <Logging.h> |
| 28 #include <OrthancException.h> | |
| 0 | 29 |
| 30 #include <boost/thread.hpp> | |
| 31 | |
| 32 namespace OrthancDatabases | |
| 33 { | |
| 34 IDatabase& DatabaseManager::GetDatabase() | |
| 35 { | |
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36 unsigned int maxConnectionRetries = 10; |
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37 unsigned int connectionRetryInterval = 5; |
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38 unsigned int count = 0; |
| 0 | 39 |
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40 factory_->GetConnectionRetriesParameters(maxConnectionRetries, connectionRetryInterval); |
| 0 | 41 |
| 42 while (database_.get() == NULL) | |
| 43 { | |
| 44 transaction_.reset(NULL); | |
| 45 | |
| 46 try | |
| 47 { | |
| 48 database_.reset(factory_->Open()); | |
| 49 } | |
| 50 catch (Orthanc::OrthancException& e) | |
| 51 { | |
| 52 if (e.GetErrorCode() == Orthanc::ErrorCode_DatabaseUnavailable) | |
| 53 { | |
| 54 count ++; | |
| 55 | |
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56 if (count <= maxConnectionRetries) |
| 0 | 57 { |
| 58 LOG(WARNING) << "Database is currently unavailable, retrying..."; | |
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59 boost::this_thread::sleep(boost::posix_time::seconds(connectionRetryInterval)); |
| 0 | 60 continue; |
| 61 } | |
| 62 else | |
| 63 { | |
| 64 LOG(ERROR) << "Timeout when connecting to the database, giving up"; | |
| 65 } | |
| 66 } | |
| 67 | |
| 68 throw; | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 if (database_.get() == NULL || | |
| 73 database_->GetDialect() != dialect_) | |
| 74 { | |
| 75 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); | |
| 76 } | |
| 77 else | |
| 78 { | |
| 79 return *database_; | |
| 80 } | |
| 81 } | |
| 82 | |
| 83 | |
| 84 void DatabaseManager::Close() | |
| 85 { | |
| 86 LOG(TRACE) << "Closing the connection to the database"; | |
| 87 | |
| 88 // Rollback active transaction, if any | |
| 89 transaction_.reset(NULL); | |
| 90 | |
| 91 // Delete all the cached statements (must occur before closing | |
| 92 // the database) | |
| 93 for (CachedStatements::iterator it = cachedStatements_.begin(); | |
| 94 it != cachedStatements_.end(); ++it) | |
| 95 { | |
| 96 assert(it->second != NULL); | |
| 97 delete it->second; | |
| 98 } | |
| 99 | |
| 100 cachedStatements_.clear(); | |
| 101 | |
| 102 // Close the database | |
| 103 database_.reset(NULL); | |
| 104 | |
| 105 LOG(TRACE) << "Connection to the database is closed"; | |
| 106 } | |
| 107 | |
| 108 | |
| 109 void DatabaseManager::CloseIfUnavailable(Orthanc::ErrorCode e) | |
| 110 { | |
| 111 if (e != Orthanc::ErrorCode_Success) | |
| 112 { | |
| 113 transaction_.reset(NULL); | |
| 114 } | |
| 115 | |
| 116 if (e == Orthanc::ErrorCode_DatabaseUnavailable) | |
| 117 { | |
| 118 LOG(ERROR) << "The database is not available, closing the connection"; | |
| 119 Close(); | |
| 120 } | |
| 121 } | |
| 122 | |
| 123 | |
| 124 IPrecompiledStatement* DatabaseManager::LookupCachedStatement(const StatementLocation& location) const | |
| 125 { | |
| 126 CachedStatements::const_iterator found = cachedStatements_.find(location); | |
| 127 | |
| 128 if (found == cachedStatements_.end()) | |
| 129 { | |
| 130 return NULL; | |
| 131 } | |
| 132 else | |
| 133 { | |
| 134 assert(found->second != NULL); | |
| 135 return found->second; | |
| 136 } | |
| 137 } | |
| 138 | |
| 139 | |
| 140 IPrecompiledStatement& DatabaseManager::CacheStatement(const StatementLocation& location, | |
| 141 const Query& query) | |
| 142 { | |
| 143 LOG(TRACE) << "Caching statement from " << location.GetFile() << ":" << location.GetLine(); | |
| 144 | |
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145 std::unique_ptr<IPrecompiledStatement> statement(GetDatabase().Compile(query)); |
| 0 | 146 |
| 147 IPrecompiledStatement* tmp = statement.get(); | |
| 148 if (tmp == NULL) | |
| 149 { | |
| 150 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); | |
| 151 } | |
| 152 | |
| 153 assert(cachedStatements_.find(location) == cachedStatements_.end()); | |
| 154 cachedStatements_[location] = statement.release(); | |
| 155 | |
| 156 return *tmp; | |
| 157 } | |
| 158 | |
| 159 | |
| 160 ITransaction& DatabaseManager::GetTransaction() | |
| 161 { | |
| 162 if (transaction_.get() == NULL) | |
| 163 { | |
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164 LOG(TRACE) << "Automatically creating an implicit database transaction"; |
| 0 | 165 |
| 166 try | |
| 167 { | |
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168 transaction_.reset(GetDatabase().CreateTransaction(true)); |
| 0 | 169 } |
| 170 catch (Orthanc::OrthancException& e) | |
| 171 { | |
| 172 CloseIfUnavailable(e.GetErrorCode()); | |
| 173 throw; | |
| 174 } | |
| 175 } | |
| 176 | |
| 177 assert(transaction_.get() != NULL); | |
| 178 return *transaction_; | |
| 179 } | |
| 180 | |
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181 |
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182 void DatabaseManager::ReleaseImplicitTransaction() |
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183 { |
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184 if (transaction_.get() != NULL && |
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185 transaction_->IsImplicit()) |
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186 { |
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187 LOG(TRACE) << "Committing an implicit database transaction"; |
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188 |
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189 try |
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190 { |
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191 transaction_->Commit(); |
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192 transaction_.reset(NULL); |
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193 } |
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194 catch (Orthanc::OrthancException& e) |
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195 { |
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196 // Don't throw the exception, as we are in CachedStatement destructor |
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197 LOG(ERROR) << "Error while committing an implicit database transaction: " << e.What(); |
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198 } |
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199 } |
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200 } |
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201 |
| 0 | 202 |
| 203 DatabaseManager::DatabaseManager(IDatabaseFactory* factory) : // Takes ownership | |
| 204 factory_(factory) | |
| 205 { | |
| 206 if (factory == NULL) | |
| 207 { | |
| 208 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer); | |
| 209 } | |
| 210 | |
| 211 dialect_ = factory->GetDialect(); | |
| 212 } | |
| 213 | |
| 214 | |
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215 void DatabaseManager::StartTransaction(TransactionType type) |
| 0 | 216 { |
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217 // TODO - Deal with TransactionType |
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218 |
| 0 | 219 boost::recursive_mutex::scoped_lock lock(mutex_); |
| 220 | |
| 221 try | |
| 222 { | |
| 223 if (transaction_.get() != NULL) | |
| 224 { | |
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225 LOG(ERROR) << "Cannot start another transaction while there is an uncommitted transaction"; |
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226 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database); |
| 0 | 227 } |
| 228 | |
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229 transaction_.reset(GetDatabase().CreateTransaction(false)); |
| 0 | 230 } |
| 231 catch (Orthanc::OrthancException& e) | |
| 232 { | |
| 233 CloseIfUnavailable(e.GetErrorCode()); | |
| 234 throw; | |
| 235 } | |
| 236 } | |
| 237 | |
| 238 | |
| 239 void DatabaseManager::CommitTransaction() | |
| 240 { | |
| 241 boost::recursive_mutex::scoped_lock lock(mutex_); | |
| 242 | |
| 243 if (transaction_.get() == NULL) | |
| 244 { | |
| 245 LOG(ERROR) << "Cannot commit a non-existing transaction"; | |
| 246 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls); | |
| 247 } | |
| 248 else | |
| 249 { | |
| 250 try | |
| 251 { | |
| 252 transaction_->Commit(); | |
| 253 transaction_.reset(NULL); | |
| 254 } | |
| 255 catch (Orthanc::OrthancException& e) | |
| 256 { | |
| 257 CloseIfUnavailable(e.GetErrorCode()); | |
| 258 throw; | |
| 259 } | |
| 260 } | |
| 261 } | |
| 262 | |
| 263 | |
| 264 void DatabaseManager::RollbackTransaction() | |
| 265 { | |
| 266 boost::recursive_mutex::scoped_lock lock(mutex_); | |
| 267 | |
| 268 if (transaction_.get() == NULL) | |
| 269 { | |
| 270 LOG(ERROR) << "Cannot rollback a non-existing transaction"; | |
| 271 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls); | |
| 272 } | |
| 273 else | |
| 274 { | |
| 275 try | |
| 276 { | |
| 277 transaction_->Rollback(); | |
| 278 transaction_.reset(NULL); | |
| 279 } | |
| 280 catch (Orthanc::OrthancException& e) | |
| 281 { | |
| 282 CloseIfUnavailable(e.GetErrorCode()); | |
| 283 throw; | |
| 284 } | |
| 285 } | |
| 286 } | |
| 287 | |
| 288 | |
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289 DatabaseManager::Transaction::Transaction(DatabaseManager& manager, |
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290 TransactionType type) : |
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291 lock_(manager.mutex_), |
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292 manager_(manager), |
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293 database_(manager.GetDatabase()), |
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294 committed_(false) |
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295 { |
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296 manager_.StartTransaction(type); |
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297 } |
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298 |
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299 |
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300 DatabaseManager::Transaction::~Transaction() |
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301 { |
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302 if (!committed_) |
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303 { |
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304 try |
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305 { |
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306 manager_.RollbackTransaction(); |
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307 } |
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308 catch (Orthanc::OrthancException& e) |
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309 { |
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310 // Don't rethrow the exception as we are in a destructor |
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311 LOG(ERROR) << "Uncatched error during some transaction rollback: " << e.What(); |
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312 } |
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313 } |
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314 } |
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315 |
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316 |
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317 void DatabaseManager::Transaction::Commit() |
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318 { |
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319 if (committed_) |
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320 { |
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321 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls); |
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322 } |
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323 else |
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324 { |
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325 manager_.CommitTransaction(); |
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326 committed_ = true; |
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327 } |
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328 } |
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329 |
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330 |
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331 IResult& DatabaseManager::StatementBase::GetResult() const |
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332 { |
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333 if (result_.get() == NULL) |
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334 { |
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335 LOG(ERROR) << "Accessing the results of a statement without having executed it"; |
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336 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls); |
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337 } |
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338 |
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339 return *result_; |
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340 } |
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341 |
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342 |
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343 void DatabaseManager::StatementBase::SetQuery(Query* query) |
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344 { |
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345 std::unique_ptr<Query> protection(query); |
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346 |
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347 if (query_.get() != NULL) |
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348 { |
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349 LOG(ERROR) << "Cannot set twice a query"; |
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350 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls); |
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351 } |
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352 |
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353 if (query == NULL) |
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354 { |
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355 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer); |
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356 } |
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357 |
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358 query_.reset(protection.release()); |
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359 } |
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360 |
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361 |
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362 void DatabaseManager::StatementBase::SetResult(IResult* result) |
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363 { |
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364 std::unique_ptr<IResult> protection(result); |
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365 |
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366 if (result_.get() != NULL) |
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367 { |
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368 LOG(ERROR) << "Cannot execute twice a statement"; |
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369 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls); |
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370 } |
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371 |
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372 if (result == NULL) |
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373 { |
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374 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer); |
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375 } |
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376 |
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377 result_.reset(protection.release()); |
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378 } |
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379 |
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380 |
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381 DatabaseManager::StatementBase::StatementBase(DatabaseManager& manager) : |
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382 manager_(manager), |
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383 lock_(manager_.mutex_), |
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384 transaction_(manager_.GetTransaction()) |
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385 { |
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386 } |
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387 |
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388 |
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389 DatabaseManager::StatementBase::~StatementBase() |
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390 { |
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391 manager_.ReleaseImplicitTransaction(); |
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392 } |
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393 |
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394 |
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395 void DatabaseManager::StatementBase::SetReadOnly(bool readOnly) |
| 0 | 396 { |
| 397 if (query_.get() != NULL) | |
| 398 { | |
| 399 query_->SetReadOnly(readOnly); | |
| 400 } | |
| 401 } | |
| 402 | |
| 403 | |
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404 void DatabaseManager::StatementBase::SetParameterType(const std::string& parameter, |
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405 ValueType type) |
| 0 | 406 { |
| 407 if (query_.get() != NULL) | |
| 408 { | |
| 409 query_->SetType(parameter, type); | |
| 410 } | |
| 411 } | |
| 412 | |
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413 bool DatabaseManager::StatementBase::IsDone() const |
| 0 | 414 { |
| 415 try | |
| 416 { | |
| 417 return GetResult().IsDone(); | |
| 418 } | |
| 419 catch (Orthanc::OrthancException& e) | |
| 420 { | |
| 421 manager_.CloseIfUnavailable(e.GetErrorCode()); | |
| 422 throw; | |
| 423 } | |
| 424 } | |
| 425 | |
| 426 | |
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427 void DatabaseManager::StatementBase::Next() |
| 0 | 428 { |
| 429 try | |
| 430 { | |
| 431 GetResult().Next(); | |
| 432 } | |
| 433 catch (Orthanc::OrthancException& e) | |
| 434 { | |
| 435 manager_.CloseIfUnavailable(e.GetErrorCode()); | |
| 436 throw; | |
| 437 } | |
| 438 } | |
| 439 | |
| 440 | |
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441 size_t DatabaseManager::StatementBase::GetResultFieldsCount() const |
| 0 | 442 { |
| 443 try | |
| 444 { | |
| 445 return GetResult().GetFieldsCount(); | |
| 446 } | |
| 447 catch (Orthanc::OrthancException& e) | |
| 448 { | |
| 449 manager_.CloseIfUnavailable(e.GetErrorCode()); | |
| 450 throw; | |
| 451 } | |
| 452 } | |
| 453 | |
| 454 | |
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455 void DatabaseManager::StatementBase::SetResultFieldType(size_t field, |
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456 ValueType type) |
| 0 | 457 { |
| 458 try | |
| 459 { | |
| 460 if (!GetResult().IsDone()) | |
| 461 { | |
| 462 GetResult().SetExpectedType(field, type); | |
| 463 } | |
| 464 } | |
| 465 catch (Orthanc::OrthancException& e) | |
| 466 { | |
| 467 manager_.CloseIfUnavailable(e.GetErrorCode()); | |
| 468 throw; | |
| 469 } | |
| 470 } | |
| 471 | |
| 472 | |
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473 const IValue& DatabaseManager::StatementBase::GetResultField(size_t index) const |
| 0 | 474 { |
| 475 try | |
| 476 { | |
| 477 return GetResult().GetField(index); | |
| 478 } | |
| 479 catch (Orthanc::OrthancException& e) | |
| 480 { | |
| 481 manager_.CloseIfUnavailable(e.GetErrorCode()); | |
| 482 throw; | |
| 483 } | |
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484 } |
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485 |
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486 |
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487 DatabaseManager::CachedStatement::CachedStatement(const StatementLocation& location, |
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488 DatabaseManager& manager, |
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489 const std::string& sql) : |
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490 StatementBase(manager), |
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491 location_(location) |
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492 { |
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493 statement_ = GetManager().LookupCachedStatement(location_); |
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494 |
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495 if (statement_ == NULL) |
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496 { |
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497 SetQuery(new Query(sql)); |
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498 } |
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499 else |
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500 { |
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501 LOG(TRACE) << "Reusing cached statement from " |
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502 << location_.GetFile() << ":" << location_.GetLine(); |
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503 } |
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504 } |
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505 |
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506 |
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507 void DatabaseManager::CachedStatement::Execute(const Dictionary& parameters) |
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508 { |
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509 try |
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510 { |
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511 std::unique_ptr<Query> query(ReleaseQuery()); |
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512 |
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513 if (query.get() != NULL) |
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514 { |
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515 // Register the newly-created statement |
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516 assert(statement_ == NULL); |
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517 statement_ = &GetManager().CacheStatement(location_, *query); |
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518 } |
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519 |
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520 assert(statement_ != NULL); |
| 116 | 521 |
| 522 /* | |
| 523 TODO - Sample code to monitor the execution time of each | |
| 524 cached statement, and publish it as an Orthanc metrics | |
| 525 | |
| 526 #if HAS_ORTHANC_PLUGIN_METRICS == 1 | |
| 527 std::string name = (std::string(location_.GetFile()) + "_" + | |
| 528 boost::lexical_cast<std::string>(location_.GetLine())); | |
| 529 OrthancPlugins::MetricsTimer timer(name.c_str()); | |
| 530 #endif | |
| 531 */ | |
| 532 | |
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533 SetResult(GetTransaction().Execute(*statement_, parameters)); |
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534 } |
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535 catch (Orthanc::OrthancException& e) |
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536 { |
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537 GetManager().CloseIfUnavailable(e.GetErrorCode()); |
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538 throw; |
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539 } |
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540 } |
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541 |
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542 |
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543 DatabaseManager::StandaloneStatement::StandaloneStatement(DatabaseManager& manager, |
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544 const std::string& sql) : |
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545 StatementBase(manager) |
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546 { |
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547 SetQuery(new Query(sql)); |
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548 } |
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549 |
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550 |
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551 DatabaseManager::StandaloneStatement::~StandaloneStatement() |
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552 { |
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553 // The result must be removed before the statement, cf. (*) |
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554 ClearResult(); |
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555 statement_.reset(); |
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556 } |
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557 |
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558 |
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559 void DatabaseManager::StandaloneStatement::Execute(const Dictionary& parameters) |
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560 { |
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561 try |
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562 { |
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563 std::unique_ptr<Query> query(ReleaseQuery()); |
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564 assert(query.get() != NULL); |
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565 |
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566 // The "statement_" object must be kept as long as the "IResult" |
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567 // is not destroyed, as the "IResult" can make calls to the |
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568 // statement (this is the case for SQLite and MySQL) - (*) |
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569 statement_.reset(GetManager().GetDatabase().Compile(*query)); |
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570 assert(statement_.get() != NULL); |
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571 |
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572 SetResult(GetTransaction().Execute(*statement_, parameters)); |
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573 } |
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574 catch (Orthanc::OrthancException& e) |
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575 { |
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576 GetManager().CloseIfUnavailable(e.GetErrorCode()); |
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577 throw; |
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578 } |
| 0 | 579 } |
| 580 } |