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annotate Framework/Common/DatabaseManager.h @ 241:a063bbf10a3e

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simplification of class DatabaseManager::Transaction
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 13 Apr 2021 12:07:30 +0200
parents 35598014f140
children 8a4ce70f456a
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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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3236894320d6 upgrade to year 2021
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5 * Copyright (C) 2017-2021 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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21
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22 #pragma once
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24 #include "IDatabase.h"
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25 #include "StatementLocation.h"
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27 #include <Compatibility.h> // For std::unique_ptr<>
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28 #include <Enumerations.h>
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30 #include <memory>
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32
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33 namespace OrthancDatabases
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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 **/
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43 class DatabaseManager : public boost::noncopyable
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44 {
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45 private:
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46 typedef std::map<StatementLocation, IPrecompiledStatement*> CachedStatements;
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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_;
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52
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53 void CloseIfUnavailable(Orthanc::ErrorCode e);
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54
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55 IPrecompiledStatement* LookupCachedStatement(const StatementLocation& location) const;
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56
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57 IPrecompiledStatement& CacheStatement(const StatementLocation& location,
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58 const Query& query);
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59
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60 ITransaction& GetTransaction();
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61
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62 void ReleaseImplicitTransaction();
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63
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64 public:
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65 explicit DatabaseManager(IDatabase* database); // Takes ownership
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66
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67 ~DatabaseManager()
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68 {
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69 Close();
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70 }
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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
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77 Dialect GetDialect() const
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78 {
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79 return dialect_;
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80 }
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81
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82 void Close();
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83
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84 void StartTransaction(TransactionType type);
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85
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86 void CommitTransaction();
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87
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88 void RollbackTransaction();
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89
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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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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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121
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122 class StatementBase : public boost::noncopyable
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123 {
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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_;
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129
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130 IResult& GetResult() const;
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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);
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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:
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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
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163 IDatabase& GetDatabase()
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164 {
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165 return manager_.GetDatabase();
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166 }
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167
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168 void SetReadOnly(bool readOnly);
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169
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170 void SetParameterType(const std::string& parameter,
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171 ValueType type);
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172
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173 bool IsDone() const;
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174
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175 void Next();
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176
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177 size_t GetResultFieldsCount() const;
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178
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179 void SetResultFieldType(size_t field,
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180 ValueType type);
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181
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182 const IValue& GetResultField(size_t index) const;
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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 };
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226 };
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227 }