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annotate Framework/MySQL/MySQLDatabase.h @ 135:e26690365c25

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MySQL: Added an advisory lock to avoid race conditions during database setup
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 08 May 2019 21:09:18 +0200
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children 52b3859ee0b7
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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) 2017-2019 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #pragma once
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23
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24 #if ORTHANC_ENABLE_MYSQL != 1
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25 # error MySQL support must be enabled to use this file
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26 #endif
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27
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28 #include "../Common/IDatabase.h"
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29 #include "MySQLParameters.h"
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30
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31 #include <mysql.h>
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32
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33 namespace OrthancDatabases
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34 {
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35 class MySQLTransaction;
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36
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37 class MySQLDatabase : public IDatabase
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38 {
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39 private:
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40 MySQLParameters parameters_;
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41 MYSQL *mysql_;
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42
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43 void OpenInternal(const char* database);
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44
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45 void Close();
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46
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47 bool RunAdvisoryLockStatement(const std::string& statement);
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49 public:
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50 MySQLDatabase(const MySQLParameters& parameters);
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52 virtual ~MySQLDatabase();
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53
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54 void LogError();
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55
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56 void CheckErrorCode(int code);
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57
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58 MYSQL* GetObject();
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59
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60 void Open();
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61
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62 void OpenRoot()
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63 {
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64 OpenInternal(NULL);
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65 }
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66
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67 static void ClearDatabase(const MySQLParameters& parameters);
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68
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69 bool LookupGlobalStringVariable(std::string& value,
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70 const std::string& variable);
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71
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72 bool LookupGlobalIntegerVariable(int64_t& value,
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73 const std::string& variable);
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75 bool AcquireAdvisoryLock(int32_t lock);
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77 bool ReleaseAdvisoryLock(int32_t lock);
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79 void AdvisoryLock(int32_t lock);
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80
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81 void Execute(const std::string& sql,
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82 bool arobaseSeparator);
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83
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84 bool DoesTableExist(MySQLTransaction& transaction,
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85 const std::string& name);
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86
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87 bool DoesDatabaseExist(MySQLTransaction& transaction,
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88 const std::string& name);
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89
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90 virtual Dialect GetDialect() const
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91 {
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92 return Dialect_MySQL;
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93 }
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94
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95 virtual IPrecompiledStatement* Compile(const Query& query);
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96
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97 virtual ITransaction* CreateTransaction(bool isImplicit);
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98
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99 static void GlobalFinalization();
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100
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101 static bool IsValidDatabaseIdentifier(const std::string& s);
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102
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103 class TransientAdvisoryLock
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104 {
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105 private:
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106 MySQLDatabase& database_;
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107 int32_t lock_;
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108
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109 public:
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110 TransientAdvisoryLock(MySQLDatabase& database,
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111 int32_t lock);
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112
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113 ~TransientAdvisoryLock();
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114 };
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115 };
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116 }