630 lines
18 KiB
C++
630 lines
18 KiB
C++
//
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// Extractor.h
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//
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// Library: Data/SQLite
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// Package: SQLite
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// Module: Extractor
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//
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// Definition of the Extractor class.
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//
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// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Data_SQLite_Extractor_INCLUDED
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#define Data_SQLite_Extractor_INCLUDED
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#include "Poco/Data/SQLite/SQLite.h"
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#include "Poco/Data/SQLite/Utility.h"
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#include "Poco/Data/AbstractExtractor.h"
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#include "Poco/Data/MetaColumn.h"
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#include "Poco/Data/DataException.h"
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#include "Poco/Data/Constants.h"
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#include "Poco/Data/Date.h"
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#include "Poco/Data/Time.h"
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#include "Poco/Data/Date.h"
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#include "Poco/Data/Time.h"
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#include "Poco/Nullable.h"
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#include "Poco/UUID.h"
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#include "Poco/UTFString.h"
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#include "Poco/Any.h"
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#include "Poco/Dynamic/Var.h"
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#include "sqlite3.h"
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#include <vector>
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#include <utility>
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namespace Poco {
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namespace Data {
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namespace SQLite {
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class SQLite_API Extractor: public Poco::Data::AbstractExtractor
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/// Extracts and converts data values form the result row returned by SQLite.
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/// If NULL is received, the incoming val value is not changed and false is returned
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{
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public:
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using NullIndVec = std::vector<std::pair<bool, bool> >;
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/// Type for null indicators container.
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Extractor(sqlite3_stmt* pStmt);
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/// Creates the Extractor.
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~Extractor();
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/// Destroys the Extractor.
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bool extract(std::size_t pos, Poco::Int8& val) override;
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/// Extracts an Int8.
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bool extract(std::size_t pos, Poco::UInt8& val) override;
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/// Extracts an UInt8.
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bool extract(std::size_t pos, Poco::Int16& val) override;
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/// Extracts an Int16.
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bool extract(std::size_t pos, Poco::UInt16& val) override;
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/// Extracts an UInt16.
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bool extract(std::size_t pos, Poco::Int32& val) override;
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/// Extracts an Int32.
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bool extract(std::size_t pos, Poco::UInt32& val) override;
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/// Extracts an UInt32.
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bool extract(std::size_t pos, Poco::Int64& val) override;
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/// Extracts an Int64.
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bool extract(std::size_t pos, Poco::UInt64& val) override;
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/// Extracts an UInt64.
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bool extract(std::size_t pos, bool& val) override;
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/// Extracts a boolean.
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bool extract(std::size_t pos, float& val) override;
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/// Extracts a float.
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bool extract(std::size_t pos, double& val) override;
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/// Extracts a double.
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bool extract(std::size_t pos, char& val) override;
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/// Extracts a single character.
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bool extract(std::size_t pos, std::string& val) override;
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/// Extracts a string.
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bool extract(std::size_t pos, UTF16String& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, Poco::Data::BLOB& val) override;
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/// Extracts a BLOB.
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bool extract(std::size_t pos, Poco::Data::CLOB& val) override;
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/// Extracts a CLOB.
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bool extract(std::size_t pos, Poco::Data::Date& val) override;
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/// Extracts a Date.
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bool extract(std::size_t pos, Poco::Data::Time& val) override;
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/// Extracts a Time.
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bool extract(std::size_t pos, Poco::DateTime& val) override;
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/// Extracts a DateTime.
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bool extract(std::size_t pos, Poco::UUID& val) override;
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/// Extracts a UUID.
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bool extract(std::size_t pos, Poco::Any& val) override;
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/// Extracts an Any.
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bool extract(std::size_t pos, Poco::Dynamic::Var& val) override;
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/// Extracts a Dynamic::Var.
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// Nullable extraction
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bool extract(std::size_t pos, Poco::Nullable<Poco::Int8>& val) override;
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/// Extracts an Nullable<Int8>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::UInt8>& val) override;
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/// Extracts an Nullable<UInt8>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::Int16>& val) override;
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/// Extracts an Nullable<Int16>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::UInt16>& val) override;
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/// Extracts an Nullable<UInt16>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::Int32>& val) override;
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/// Extracts an Nullable<Int32>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::UInt32>& val) override;
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/// Extracts an Nullable<UInt32>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::Int64>& val) override;
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/// Extracts an Nullable<Int64>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::UInt64>& val) override;
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/// Extracts an Nullable<UInt64>.
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#ifndef POCO_INT64_IS_LONG
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bool extract(std::size_t pos, long& val) override;
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/// Extracts a long.
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bool extract(std::size_t pos, unsigned long& val) override;
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/// Extracts an unsigned long.
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bool extract(std::size_t pos, std::vector<long>& val) override;
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/// Extracts a long vector.
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bool extract(std::size_t pos, std::deque<long>& val) override;
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/// Extracts a long deque.
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bool extract(std::size_t pos, std::list<long>& val) override;
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/// Extracts a long list.
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bool extract(std::size_t pos, std::vector<unsigned long>& val) override;
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/// Extracts an unsigned long vector.
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bool extract(std::size_t pos, std::deque<unsigned long>& val) override;
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/// Extracts an unsigned long deque.
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bool extract(std::size_t pos, std::list<unsigned long>& val) override;
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/// Extracts an unsigned long list.
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bool extract(std::size_t pos, Poco::Nullable<long>& val) override;
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/// Extracts a Nullable<long>.
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bool extract(std::size_t pos, Poco::Nullable<unsigned long>& val) override;
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/// Extracts a Nullable<unsigned long>.
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#endif
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bool extract(std::size_t pos, Poco::Nullable<bool>& val) override;
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/// Extracts a Nullable<bool>.
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bool extract(std::size_t pos, Poco::Nullable<float>& val) override;
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/// Extracts a Nullable<float>.
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bool extract(std::size_t pos, Poco::Nullable<double>& val) override;
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/// Extracts a Nullable<double>.
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bool extract(std::size_t pos, Poco::Nullable<char>& val) override;
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/// Extracts a single Nullable character.
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bool extract(std::size_t pos, Poco::Nullable<std::string>& val) override;
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/// Extracts a Nullable<string>.
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bool extract(std::size_t pos, Poco::Nullable<UTF16String>& val) override;
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/// Extracts a Nullable<UTF16String>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::Data::BLOB>& val) override;
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/// Extracts a Nullable<BLOB>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::Data::CLOB>& val) override;
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/// Extracts a Nullable<BLOB>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::Data::Date>& val) override;
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/// Extracts a Nullable<Date>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::Data::Time>& val) override;
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/// Extracts a :Nullable<Time>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::DateTime>& val) override;
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/// Extracts Nullable<DateTime>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::UUID>& val) override;
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/// Extracts a Nullable<UUID>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::Any>& val) override;
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/// Extracts a Nullable<Any>.
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bool extract(std::size_t pos, Poco::Nullable<Poco::Dynamic::Var>& val) override;
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/// Extracts a Nullable<Var>.
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// Containers
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bool extract(std::size_t pos, std::vector<Poco::Int8>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::Int8>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::Int8>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::UInt8>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::UInt8>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::UInt8>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::Int16>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::Int16>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::Int16>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::UInt16>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::UInt16>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::UInt16>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::Int32>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::Int32>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::Int32>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::UInt32>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::UInt32>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::UInt32>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::Int64>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::Int64>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::Int64>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::UInt64>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::UInt64>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::UInt64>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<bool>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<bool>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<bool>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<char>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<char>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<char>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<std::string>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<std::string>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<std::string>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<UTF16String>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<UTF16String>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<UTF16String>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<float>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<float>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<float>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<double>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<double>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<double>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::Data::Date>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::Data::Date>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::Data::Date>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::Data::Time>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::Data::Time>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::Data::Time>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::Data::BLOB>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::Data::BLOB>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::Data::BLOB>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::Data::CLOB>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::Data::CLOB>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::Data::CLOB>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::DateTime>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::DateTime>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::DateTime>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::UUID>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::UUID>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::UUID>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::Any>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::Any>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::Any>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::vector<Poco::Dynamic::Var>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::deque<Poco::Dynamic::Var>& val) override;
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/// Throws NotImplementedException.
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bool extract(std::size_t pos, std::list<Poco::Dynamic::Var>& val) override;
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/// Throws NotImplementedException.
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bool isNull(std::size_t pos, std::size_t row = POCO_DATA_INVALID_ROW) override;
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/// Returns true if the current row value at pos column is null.
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/// Because of the loss of information about null-ness of the
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/// underlying database values due to the nature of SQLite engine,
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/// (once null value is converted to default value, SQLite API
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/// treats it as non-null), a null indicator container member
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/// variable is used to cache the indicators of the underlying nulls
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/// thus rendering this function idempotent.
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/// The container is a vector of [bool, bool] pairs.
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/// The vector index corresponds to the column position, the first
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/// bool value in the pair is true if the null indicator has
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/// been set and the second bool value in the pair is true if
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/// the column is actually null.
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/// The row argument, needed for connectors with bulk capabilities,
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/// is ignored in this implementation.
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void reset() override;
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/// Clears the cached nulls indicator vector.
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private:
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template <typename F, typename T>
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bool extract(F func, std::size_t pos, T& val)
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{
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if (isNull(pos)) return false;
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val = func(_pStmt, (int) pos);
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return true;
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}
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template <typename T>
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bool extractImpl(std::size_t pos, T& val)
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/// Utility function for extraction of Any and Dynamic::Var.
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{
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if (isNull(pos)) return false;
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bool ret = false;
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switch (Utility::getColumnType(_pStmt, pos))
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{
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case MetaColumn::FDT_BOOL:
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{
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bool i = false;
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ret = extract(pos, i);
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val = i;
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break;
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}
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case MetaColumn::FDT_INT8:
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{
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Poco::Int8 i = 0;
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ret = extract(pos, i);
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val = i;
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break;
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}
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case MetaColumn::FDT_UINT8:
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{
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Poco::UInt8 i = 0;
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ret = extract(pos, i);
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val = i;
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break;
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}
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case MetaColumn::FDT_INT16:
|
|
{
|
|
Poco::Int16 i = 0;
|
|
ret = extract(pos, i);
|
|
val = i;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_UINT16:
|
|
{
|
|
Poco::UInt16 i = 0;
|
|
ret = extract(pos, i);
|
|
val = i;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_INT32:
|
|
{
|
|
Poco::Int32 i = 0;
|
|
ret = extract(pos, i);
|
|
val = i;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_UINT32:
|
|
{
|
|
Poco::UInt32 i = 0;
|
|
ret = extract(pos, i);
|
|
val = i;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_INT64:
|
|
{
|
|
Poco::Int64 i = 0;
|
|
ret = extract(pos, i);
|
|
val = i;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_UINT64:
|
|
{
|
|
Poco::UInt64 i = 0;
|
|
ret = extract(pos, i);
|
|
val = i;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_STRING:
|
|
{
|
|
std::string s;
|
|
ret = extract(pos, s);
|
|
val = s;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_DOUBLE:
|
|
{
|
|
double d(0.0);
|
|
ret = extract(pos, d);
|
|
val = d;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_FLOAT:
|
|
{
|
|
float f(0.0);
|
|
ret = extract(pos, f);
|
|
val = f;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_BLOB:
|
|
{
|
|
BLOB b;
|
|
ret = extract(pos, b);
|
|
val = b;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_DATE:
|
|
{
|
|
Date d;
|
|
ret = extract(pos, d);
|
|
val = d;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_TIME:
|
|
{
|
|
Time t;
|
|
ret = extract(pos, t);
|
|
val = t;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_TIMESTAMP:
|
|
{
|
|
DateTime dt;
|
|
ret = extract(pos, dt);
|
|
val = dt;
|
|
break;
|
|
}
|
|
case MetaColumn::FDT_UUID:
|
|
{
|
|
UUID uuid;
|
|
ret = extract(pos, uuid);
|
|
val = uuid;
|
|
break;
|
|
}
|
|
default:
|
|
throw Poco::Data::UnknownTypeException("Unknown type during extraction");
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
template <typename T>
|
|
bool extractLOB(std::size_t pos, Poco::Data::LOB<T>& val)
|
|
{
|
|
if (isNull(pos)) return false;
|
|
int size = sqlite3_column_bytes(_pStmt, (int) pos);
|
|
const T* pTmp = reinterpret_cast<const T*>(sqlite3_column_blob(_pStmt, (int) pos));
|
|
val = Poco::Data::LOB<T>(pTmp, size);
|
|
return true;
|
|
}
|
|
|
|
sqlite3_stmt* _pStmt;
|
|
NullIndVec _nulls;
|
|
};
|
|
|
|
|
|
///
|
|
/// inlines
|
|
///
|
|
inline void Extractor::reset()
|
|
{
|
|
_nulls.clear();
|
|
}
|
|
|
|
|
|
inline bool Extractor::extract(std::size_t pos, Poco::Data::BLOB& val)
|
|
{
|
|
return extractLOB<Poco::Data::BLOB::ValueType>(pos, val);
|
|
}
|
|
|
|
|
|
inline bool Extractor::extract(std::size_t pos, Poco::Data::CLOB& val)
|
|
{
|
|
return extractLOB<Poco::Data::CLOB::ValueType>(pos, val);
|
|
}
|
|
|
|
|
|
} } } // namespace Poco::Data::SQLite
|
|
|
|
|
|
#endif // Data_SQLite_Extractor_INCLUDED
|