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/*
* This source file is part of libRocket, the HTML/CSS Interface Middleware
*
* For the latest information, see http://www.librocket.com
*
* Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* 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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#ifndef ROCKETCONTROLSDATAQUERY_H
#define ROCKETCONTROLSDATAQUERY_H
#include "Header.h"
#include "../Core/TypeConverter.h"
#include "../Core/Log.h"
namespace Rocket {
namespace Controls {
class DataSource;
/**
DataQuery
@author Robert Curry
Represents a request for information from an DataSource, encapsulates the result and offers
mechanisms to iterate through the returned rows.
*/
class ROCKETCONTROLS_API DataQuery
{
public:
DataQuery();
DataQuery(DataSource* data_source, const Rocket::Core::String& table, const Rocket::Core::String& fields, int offset = 0, int limit = -1, const Rocket::Core::String& order = "");
virtual ~DataQuery();
void ExecuteQuery(DataSource* data_source, const Rocket::Core::String& table, const Rocket::Core::String& fields, int offset = 0, int limit = -1, const Rocket::Core::String& order = "");
bool NextRow();
bool IsFieldSet(const Rocket::Core::String& field) const;
template< typename T >
T Get(const Rocket::Core::String& field_name, const T& default_value) const
{
FieldIndices::const_iterator itr = field_indices.find(field_name);
if (itr == field_indices.end())
{
Rocket::Core::Log::Message(Rocket::Core::Log::LT_ERROR, "Field %s not found in query", field_name.CString());
return default_value;
}
T return_value = default_value;
GetInto((*itr).second, return_value);
return return_value;
}
template< typename T >
bool GetInto(const Rocket::Core::String& field_name, T& value) const
{
FieldIndices::const_iterator itr = field_indices.find(field_name);
if (itr == field_indices.end())
{
Rocket::Core::Log::Message(Rocket::Core::Log::LT_ERROR, "Field %s not found in query", field_name.CString());
return false;
}
return GetInto((*itr).second, value);
}
template< typename T >
T Get(const size_t field_index, const T& default_value) const
{
T return_value = default_value;
GetInto(field_index, return_value);
return return_value;
}
template< typename T >
bool GetInto(const size_t field_index, T& value) const
{
if (field_index < rows[current_row].size())
{
return Rocket::Core::TypeConverter< Rocket::Core::String, T >::Convert(rows[current_row][field_index], value);
}
return false;
}
size_t GetNumFields()
{
return rows[current_row].size();
}
private:
Rocket::Core::StringList fields;
DataSource* data_source;
Rocket::Core::String table;
int current_row;
int offset;
int limit;
typedef std::vector< Rocket::Core::StringList > Rows;
Rows rows;
typedef std::map< Rocket::Core::String, size_t > FieldIndices;
FieldIndices field_indices;
void LoadRow();
};
}
}
#endif // ROCKETCONTROLSDATAQUERY_H
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