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annotate Framework/Common/DatabaseManager.h @ 336:c0c12b3974b2

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 11 Aug 2021 11:48:52 +0200
parents 6a668f5d1069
children 16aac0287485
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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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20
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21
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22 #pragma once
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24 #include "IDatabaseFactory.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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31
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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 * "DatabaseManager" takes a "IDatabaseFactory" as input, in order
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44 * to be able to automatically re-open the database connection if
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45 * the latter gets lost.
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46 **/
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47 class DatabaseManager : public boost::noncopyable
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48 {
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49 private:
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50 typedef std::map<StatementLocation, IPrecompiledStatement*> CachedStatements;
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51
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52 std::unique_ptr<IDatabaseFactory> factory_;
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53 std::unique_ptr<IDatabase> database_;
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54 std::unique_ptr<ITransaction> transaction_;
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55 CachedStatements cachedStatements_;
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56 Dialect dialect_;
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57
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58 void CloseIfUnavailable(Orthanc::ErrorCode e);
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59
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60 IPrecompiledStatement* LookupCachedStatement(const StatementLocation& location) const;
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61
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62 IPrecompiledStatement& CacheStatement(const StatementLocation& location,
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63 const Query& query);
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64
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65 ITransaction& GetTransaction();
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66
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67 void ReleaseImplicitTransaction();
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69 public:
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70 explicit DatabaseManager(IDatabaseFactory* factory); // Takes ownership
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71
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72 ~DatabaseManager()
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73 {
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74 Close();
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75 }
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76
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77 IDatabase& GetDatabase();
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78
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79 Dialect GetDialect() const;
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80
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81 void Close();
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82
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83 void StartTransaction(TransactionType type);
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84
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85 void CommitTransaction();
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86
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87 void RollbackTransaction();
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88
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89
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90 // This class is only used in the "StorageBackend" and in
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91 // "IDatabaseBackend::ConfigureDatabase()"
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92 class Transaction : public boost::noncopyable
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93 {
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94 private:
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95 DatabaseManager& manager_;
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96 IDatabase& database_;
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97 bool active_;
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99 public:
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100 explicit Transaction(DatabaseManager& manager,
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101 TransactionType type);
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102
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103 ~Transaction();
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104
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105 void Commit();
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106
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107 void Rollback();
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108
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109 /**
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110 * WARNING: Don't call "GetDatabaseTransaction().Commit()" and
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111 * "GetDatabaseTransaction().Rollback()", but use the "Commit()"
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112 * and "Rollback()" methods above.
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113 **/
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114 ITransaction& GetDatabaseTransaction()
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115 {
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116 return manager_.GetTransaction();
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117 }
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118 };
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121 class StatementBase : public boost::noncopyable
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122 {
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123 private:
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124 DatabaseManager& manager_;
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125 ITransaction& transaction_;
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126 std::unique_ptr<Query> query_;
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127 std::unique_ptr<IResult> result_;
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128
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129 IResult& GetResult() const;
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131 protected:
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132 DatabaseManager& GetManager() const
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133 {
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134 return manager_;
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135 }
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136
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137 ITransaction& GetTransaction() const
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138 {
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139 return transaction_;
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140 }
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141
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142 void SetQuery(Query* query);
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143
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144 void SetResult(IResult* result);
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145
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146 void ClearResult()
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147 {
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148 result_.reset();
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149 }
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150
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151 Query* ReleaseQuery()
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152 {
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153 return query_.release();
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154 }
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155
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156 public:
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157 explicit StatementBase(DatabaseManager& manager);
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158
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159 virtual ~StatementBase();
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160
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161 // Used only by SQLite
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162 IDatabase& GetDatabase()
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163 {
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164 return manager_.GetDatabase();
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165 }
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166
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167 void SetReadOnly(bool readOnly);
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168
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169 void SetParameterType(const std::string& parameter,
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170 ValueType type);
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171
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172 bool IsDone() const;
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173
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174 void Next();
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175
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176 size_t GetResultFieldsCount() const;
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177
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178 void SetResultFieldType(size_t field,
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179 ValueType type);
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180
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181 const IValue& GetResultField(size_t index) const;
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182
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183 int32_t ReadInteger32(size_t field) const;
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184
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185 int64_t ReadInteger64(size_t field) const;
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186
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187 std::string ReadString(size_t field) const;
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188
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189 void PrintResult(std::ostream& stream)
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190 {
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191 IResult::Print(stream, GetResult());
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192 }
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193 };
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194
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195
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196 /**
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197 * WARNING: At any given time, there must be at most 1 object of
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198 * the "CachedStatement" class in the scope, otherwise error
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199 * "Cannot execute more than one statement in an implicit
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200 * transaction" is generated if no explicit transaction is
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201 * present.
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202 **/
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203 class CachedStatement : public StatementBase
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204 {
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205 private:
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206 StatementLocation location_;
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207 IPrecompiledStatement* statement_;
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208
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209 public:
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210 CachedStatement(const StatementLocation& location,
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211 DatabaseManager& manager,
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212 const std::string& sql);
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213
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214 void Execute()
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215 {
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216 Dictionary parameters;
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217 Execute(parameters);
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218 }
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219
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220 void Execute(const Dictionary& parameters);
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221 };
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222
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223
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224 class StandaloneStatement : public StatementBase
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225 {
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226 private:
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227 std::unique_ptr<IPrecompiledStatement> statement_;
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228
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229 public:
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230 StandaloneStatement(DatabaseManager& manager,
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231 const std::string& sql);
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232
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233 virtual ~StandaloneStatement();
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234
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235 void Execute()
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236 {
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237 Dictionary parameters;
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238 Execute(parameters);
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239 }
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240
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241 void Execute(const Dictionary& parameters);
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242 };
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243 };
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244 }