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865 lines (712 loc) · 18.8 KB
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//
// Extraction.h
//
// $Id: //poco/Main/Data/include/Poco/Data/Extraction.h#9 $
//
// Library: Data
// Package: DataCore
// Module: Extraction
//
// Definition of the Extraction class.
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#ifndef Data_Extraction_INCLUDED
#define Data_Extraction_INCLUDED
#include "Poco/Data/Data.h"
#include "Poco/Data/AbstractExtraction.h"
#include "Poco/Data/Preparation.h"
#include "Poco/Data/TypeHandler.h"
#include "Poco/Data/Column.h"
#include "Poco/Data/Position.h"
#include "Poco/Data/DataException.h"
#include <set>
#include <vector>
#include <list>
#include <deque>
#include <map>
#include <cstddef>
namespace Poco {
namespace Data {
template <class T>
class Extraction: public AbstractExtraction
/// Concrete Data Type specific extraction of values from a query result set.
{
public:
typedef T ValType;
typedef SharedPtr<ValType> ValPtr;
typedef Extraction<ValType> Type;
typedef SharedPtr<Type> Ptr;
Extraction(T& result, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default(),
_extracted(false)
/// Creates an Extraction object at specified position.
/// Uses an empty object T as default value.
{
}
Extraction(T& result, const T& def, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default(def),
_extracted(false)
/// Creates an Extraction object at specified position.
/// Uses the provided def object as default value.
{
}
~Extraction()
/// Destroys the Extraction object.
{
}
std::size_t numOfColumnsHandled() const
{
return TypeHandler<T>::size();
}
std::size_t numOfRowsHandled() const
{
return _extracted ? 1u : 0;
}
std::size_t numOfRowsAllowed() const
{
return 1u;
}
bool isNull(std::size_t row = 0) const
{
return _null;
}
std::size_t extract(std::size_t pos)
{
if (_extracted) throw ExtractException("value already extracted");
_extracted = true;
AbstractExtractor::Ptr pExt = getExtractor();
TypeHandler<T>::extract(pos, _rResult, _default, pExt);
_null = isValueNull<T>(_rResult, pExt->isNull(pos));
return 1u;
}
void reset()
{
_extracted = false;
}
bool canExtract() const
{
return !_extracted;
}
AbstractPreparation::Ptr createPreparation(AbstractPreparator::Ptr& pPrep, std::size_t pos)
{
return new Preparation<T>(pPrep, pos, _rResult);
}
private:
T& _rResult;
T _default;
bool _extracted;
bool _null;
};
template <class T>
class Extraction<std::vector<T> >: public AbstractExtraction
/// Vector Data Type specialization for extraction of values from a query result set.
{
public:
typedef std::vector<T> ValType;
typedef SharedPtr<ValType> ValPtr;
typedef Extraction<ValType> Type;
typedef SharedPtr<Type> Ptr;
Extraction(std::vector<T>& result, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default()
{
_rResult.clear();
}
Extraction(std::vector<T>& result, const T& def, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default(def)
{
_rResult.clear();
}
virtual ~Extraction()
{
}
std::size_t numOfColumnsHandled() const
{
return TypeHandler<T>::size();
}
std::size_t numOfRowsHandled() const
{
return static_cast<std::size_t>(_rResult.size());
}
std::size_t numOfRowsAllowed() const
{
return getLimit();
}
bool isNull(std::size_t row) const
{
try
{
return _nulls.at(row);
}catch (std::out_of_range& ex)
{
throw RangeException(ex.what());
}
}
std::size_t extract(std::size_t pos)
{
AbstractExtractor::Ptr pExt = getExtractor();
_rResult.push_back(_default);
TypeHandler<T>::extract(pos, _rResult.back(), _default, pExt);
_nulls.push_back(isValueNull(_rResult.back(), pExt->isNull(pos)));
return 1u;
}
AbstractPreparation::Ptr createPreparation(AbstractPreparator::Ptr& pPrep, std::size_t pos)
{
return new Preparation<T>(pPrep, pos, _default);
}
protected:
const std::vector<T>& result() const
{
return _rResult;
}
private:
std::vector<T>& _rResult;
T _default;
std::deque<bool> _nulls;
};
template <>
class Extraction<std::vector<bool> >: public AbstractExtraction
/// Vector bool specialization for extraction of values from a query result set.
{
public:
typedef std::vector<bool> ValType;
typedef SharedPtr<ValType> ValPtr;
typedef Extraction<ValType> Type;
typedef SharedPtr<Type> Ptr;
Extraction(std::vector<bool>& result, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default()
{
_rResult.clear();
}
Extraction(std::vector<bool>& result, const bool& def, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default(def)
{
_rResult.clear();
}
virtual ~Extraction()
{
}
std::size_t numOfColumnsHandled() const
{
return TypeHandler<bool>::size();
}
std::size_t numOfRowsHandled() const
{
return static_cast<std::size_t>(_rResult.size());
}
std::size_t numOfRowsAllowed() const
{
return getLimit();
}
bool isNull(std::size_t row) const
{
try
{
return _nulls.at(row);
}catch (std::out_of_range& ex)
{
throw RangeException(ex.what());
}
}
std::size_t extract(std::size_t pos)
{
AbstractExtractor::Ptr pExt = getExtractor();
bool tmp = _default;
TypeHandler<bool>::extract(pos, tmp, _default, pExt);
_rResult.push_back(tmp);
_nulls.push_back(pExt->isNull(pos));
return 1u;
}
AbstractPreparation::Ptr createPreparation(AbstractPreparator::Ptr& pPrep, std::size_t pos)
{
return new Preparation<bool>(pPrep, pos, _default);
}
protected:
const std::vector<bool>& result() const
{
return _rResult;
}
private:
std::vector<bool>& _rResult;
bool _default;
std::deque<bool> _nulls;
};
template <class T>
class Extraction<std::list<T> >: public AbstractExtraction
/// List Data Type specialization for extraction of values from a query result set.
{
public:
typedef std::list<T> ValType;
typedef SharedPtr<ValType> ValPtr;
typedef Extraction<ValType> Type;
typedef SharedPtr<Type> Ptr;
Extraction(std::list<T>& result, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default()
{
_rResult.clear();
}
Extraction(std::list<T>& result, const T& def, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default(def)
{
_rResult.clear();
}
virtual ~Extraction()
{
}
std::size_t numOfColumnsHandled() const
{
return TypeHandler<T>::size();
}
std::size_t numOfRowsHandled() const
{
return _rResult.size();
}
std::size_t numOfRowsAllowed() const
{
return getLimit();
}
bool isNull(std::size_t row) const
{
try
{
return _nulls.at(row);
}catch (std::out_of_range& ex)
{
throw RangeException(ex.what());
}
}
std::size_t extract(std::size_t pos)
{
AbstractExtractor::Ptr pExt = getExtractor();
_rResult.push_back(_default);
TypeHandler<T>::extract(pos, _rResult.back(), _default, pExt);
_nulls.push_back(isValueNull(_rResult.back(), pExt->isNull(pos)));
return 1u;
}
AbstractPreparation::Ptr createPreparation(AbstractPreparator::Ptr& pPrep, std::size_t pos)
{
return new Preparation<T>(pPrep, pos, _default);
}
protected:
const std::list<T>& result() const
{
return _rResult;
}
private:
std::list<T>& _rResult;
T _default;
std::deque<bool> _nulls;
};
template <class T>
class Extraction<std::deque<T> >: public AbstractExtraction
/// Deque Data Type specialization for extraction of values from a query result set.
{
public:
typedef std::deque<T> ValType;
typedef SharedPtr<ValType> ValPtr;
typedef Extraction<ValType> Type;
typedef SharedPtr<Type> Ptr;
Extraction(std::deque<T>& result, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default()
{
_rResult.clear();
}
Extraction(std::deque<T>& result, const T& def, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default(def)
{
_rResult.clear();
}
virtual ~Extraction()
{
}
std::size_t numOfColumnsHandled() const
{
return TypeHandler<T>::size();
}
std::size_t numOfRowsHandled() const
{
return _rResult.size();
}
std::size_t numOfRowsAllowed() const
{
return getLimit();
}
bool isNull(std::size_t row) const
{
try
{
return _nulls.at(row);
}catch (std::out_of_range& ex)
{
throw RangeException(ex.what());
}
}
std::size_t extract(std::size_t pos)
{
AbstractExtractor::Ptr pExt = getExtractor();
_rResult.push_back(_default);
TypeHandler<T>::extract(pos, _rResult.back(), _default, pExt);
_nulls.push_back(isValueNull(_rResult.back(), pExt->isNull(pos)));
return 1u;
}
AbstractPreparation::Ptr createPreparation(AbstractPreparator::Ptr& pPrep, std::size_t pos)
{
return new Preparation<T>(pPrep, pos, _default);
}
protected:
const std::deque<T>& result() const
{
return _rResult;
}
private:
std::deque<T>& _rResult;
T _default;
std::deque<bool> _nulls;
};
template <class C>
class InternalExtraction: public Extraction<C>
/// Container Data Type specialization extension for extraction of values from a query result set.
///
/// This class is intended for PocoData internal use - it is used by StatementImpl
/// to automaticaly create internal Extraction in cases when statement returns data and no external storage
/// was supplied. It is later used by RecordSet to retrieve the fetched data after statement execution.
/// It takes ownership of the Column pointer supplied as constructor argument. Column object, in turn
/// owns the data container pointer.
///
/// InternalExtraction objects can not be copied or assigned.
{
public:
typedef typename C::value_type ValType;
typedef SharedPtr<ValType> ValPtr;
typedef Extraction<ValType> Type;
typedef SharedPtr<Type> Ptr;
explicit InternalExtraction(C& result, Column<C>* pColumn, const Position& pos = Position(0)):
Extraction<C>(result, ValType(), pos),
_pColumn(pColumn)
/// Creates InternalExtraction.
{
}
~InternalExtraction()
/// Destroys InternalExtraction.
{
delete _pColumn;
}
void reset()
{
_pColumn->reset();
}
const ValType& value(int index) const
{
try
{
return Extraction<C>::result().at(index);
}
catch (std::out_of_range& ex)
{
throw RangeException(ex.what());
}
}
bool isNull(std::size_t row) const
{
return Extraction<C>::isNull(row);
}
const Column<C>& column() const
{
return *_pColumn;
}
private:
InternalExtraction();
InternalExtraction(const InternalExtraction&);
InternalExtraction& operator = (const InternalExtraction&);
Column<C>* _pColumn;
};
template <class T>
class Extraction<std::set<T> >: public AbstractExtraction
/// Set Data Type specialization for extraction of values from a query result set.
{
public:
typedef std::set<T> ValType;
typedef SharedPtr<ValType> ValPtr;
typedef Extraction<ValType> Type;
typedef SharedPtr<Type> Ptr;
typedef typename ValType::iterator Iterator;
Extraction(std::set<T>& result, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default()
{
_rResult.clear();
}
Extraction(std::set<T>& result, const T& def, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default(def)
{
_rResult.clear();
}
~Extraction()
{
}
std::size_t numOfColumnsHandled() const
{
return TypeHandler<T>::size();
}
std::size_t numOfRowsHandled() const
{
return static_cast<std::size_t>(_rResult.size());
}
std::size_t numOfRowsAllowed() const
{
return getLimit();
}
std::size_t extract(std::size_t pos)
{
T tmp;
TypeHandler<T>::extract(pos, tmp, _default, getExtractor());
_rResult.insert(tmp);
return 1u;
}
AbstractPreparation::Ptr createPreparation(AbstractPreparator::Ptr& pPrep, std::size_t pos)
{
return new Preparation<T>(pPrep, pos, _default);
}
private:
std::set<T>& _rResult;
T _default;
};
template <class T>
class Extraction<std::multiset<T> >: public AbstractExtraction
/// Multiset Data Type specialization for extraction of values from a query result set.
{
public:
typedef std::multiset<T> ValType;
typedef SharedPtr<ValType> ValPtr;
typedef Extraction<ValType> Type;
typedef SharedPtr<Type> Ptr;
Extraction(std::multiset<T>& result, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default()
{
_rResult.clear();
}
Extraction(std::multiset<T>& result, const T& def, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default(def)
{
_rResult.clear();
}
~Extraction()
{
}
std::size_t numOfColumnsHandled() const
{
return TypeHandler<T>::size();
}
std::size_t numOfRowsHandled() const
{
return static_cast<std::size_t>(_rResult.size());
}
std::size_t numOfRowsAllowed() const
{
return getLimit();
}
std::size_t extract(std::size_t pos)
{
T tmp;
TypeHandler<T>::extract(pos, tmp, _default, getExtractor());
_rResult.insert(tmp);
return 1u;
}
AbstractPreparation::Ptr createPreparation(AbstractPreparator::Ptr& pPrep, std::size_t pos)
{
return new Preparation<T>(pPrep, pos, _default);
}
private:
std::multiset<T>& _rResult;
T _default;
};
template <class K, class V>
class Extraction<std::map<K, V> >: public AbstractExtraction
/// Map Data Type specialization for extraction of values from a query result set.
{
public:
typedef std::map<K, V> ValType;
typedef SharedPtr<ValType> ValPtr;
typedef Extraction<ValType> Type;
typedef SharedPtr<Type> Ptr;
Extraction(std::map<K, V>& result, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default()
{
_rResult.clear();
}
Extraction(std::map<K, V>& result, const V& def, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default(def)
{
_rResult.clear();
}
~Extraction()
{
}
std::size_t numOfColumnsHandled() const
{
return TypeHandler<V>::size();
}
std::size_t numOfRowsHandled() const
{
return static_cast<std::size_t>(_rResult.size());
}
std::size_t numOfRowsAllowed() const
{
return getLimit();
}
std::size_t extract(std::size_t pos)
{
V tmp;
TypeHandler<V>::extract(pos, tmp, _default, getExtractor());
_rResult.insert(std::make_pair(tmp(), tmp));
return 1u;
}
AbstractPreparation::Ptr createPreparation(AbstractPreparator::Ptr& pPrep, std::size_t pos)
{
return new Preparation<V>(pPrep, pos, _default);
}
private:
std::map<K, V>& _rResult;
V _default;
};
template <class K, class V>
class Extraction<std::multimap<K, V> >: public AbstractExtraction
/// Multimap Data Type specialization for extraction of values from a query result set.
{
public:
typedef std::multimap<K, V> ValType;
typedef SharedPtr<ValType> ValPtr;
typedef Extraction<ValType> Type;
typedef SharedPtr<Type> Ptr;
Extraction(std::multimap<K, V>& result, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default()
{
_rResult.clear();
}
Extraction(std::multimap<K, V>& result, const V& def, const Position& pos = Position(0)):
AbstractExtraction(Limit::LIMIT_UNLIMITED, pos.value()),
_rResult(result),
_default(def)
{
_rResult.clear();
}
~Extraction()
{
}
std::size_t numOfColumnsHandled() const
{
return TypeHandler<V>::size();
}
std::size_t numOfRowsHandled() const
{
return static_cast<std::size_t>(_rResult.size());
}
std::size_t numOfRowsAllowed() const
{
return getLimit();
}
std::size_t extract(std::size_t pos)
{
V tmp;
TypeHandler<V>::extract(pos, tmp, _default, getExtractor());
_rResult.insert(std::make_pair(tmp(), tmp));
return 1u;
}
AbstractPreparation::Ptr createPreparation(AbstractPreparator::Ptr& pPrep, std::size_t pos)
{
return new Preparation<V>(pPrep, pos, _default);
}
private:
std::multimap<K, V>& _rResult;
V _default;
};
namespace Keywords {
template <typename T>
inline AbstractExtraction::Ptr into(T& t)
/// Convenience function to allow for a more compact creation of an extraction object.
{
return new Extraction<T>(t);
}
template <typename T>
inline AbstractExtraction::Ptr into(T& t, const Position& pos)
/// Convenience function to allow for a more compact creation of an extraction object
/// with multiple recordset support.
{
return new Extraction<T>(t, pos);
}
template <typename T>
inline AbstractExtraction::Ptr into(T& t, const Position& pos, const T& def)
/// Convenience function to allow for a more compact creation of an extraction object
/// with multiple recordset support and the given default
{
return new Extraction<T>(t, def, pos);
}
inline AbstractExtractionVecVec& into(AbstractExtractionVecVec& evv)
/// Convenience dummy function (for syntax purposes only).
{
return evv;
}
inline AbstractExtractionVec& into(AbstractExtractionVec& ev)
/// Convenience dummy function (for syntax purposes only).
{
return ev;
}
} // namespace Keywords
} } // namespace Poco::Data
#endif // Data_Extraction_INCLUDED