CoGaDB::RowPage Class Reference

Representation of a set of rows stored as bytes. More...

#include <row_page.hpp>

Collaboration diagram for CoGaDB::RowPage:

List of all members.

Public Member Functions
	RowPage (unsigned short)
	RowPage (const RowPage &)
RowPage &	operator= (const RowPage &)
bool	isFull () const
bool	fillPage (std::vector< BufferObject * >, int)
void	print (const TableSchema &) const
unsigned short	getMaxDataSize () const
unsigned short	getDataSize () const
unsigned short	count () const
char *	createRow (std::vector< BufferObject * >, int, unsigned short &, unsigned short &)
char *	getValue (unsigned int, unsigned int, unsigned short &) const
char *	getData () const
Private Member Functions
char *	getValueFromPage (BufferObject *, int, unsigned short &)
	Gets from a buffered page the value at 'index'. Also results the size of the value in bytes.
char *	getStringFromPage (BufferObject *, int, unsigned short &)
	Gets from a buffered page the string at 'index'. Also results the size of the string in bytes.
Private Attributes
char *	_rows
	Represents the rwos as bytes.
std::vector< unsigned short >	_row_offsets
	Holds the offsets for each row.
unsigned short	_col_count
	Number of columns for this rows.
unsigned short	_row_count
	Number of rows on this page.
bool	_is_full
	true, if the page can't hold a row anymore
unsigned short	_current_data_size
	The current data size of all rows (_rows) in bytes.

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Detailed Description

Representation of a set of rows stored as bytes.

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Constructor & Destructor Documentation

CoGaDB::RowPage::RowPage

(

unsigned short

columns

)

References _row_offsets, _rows, and getMaxDataSize().

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CoGaDB::RowPage::RowPage

(

const RowPage &

rp

)

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Member Function Documentation

unsigned short CoGaDB::RowPage::count

(

)

const

References _row_count.

Referenced by getStringFromPage(), getValueFromPage(), and CoGaDB::RowTable::load().

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char * CoGaDB::RowPage::createRow	(	std::vector< BufferObject * >	pages,
		int	pos,
		unsigned short &	offset,
		unsigned short &	resRowSize
	)

References getValueFromPage().

Referenced by fillPage().

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bool CoGaDB::RowPage::fillPage	(	std::vector< BufferObject * >	pages,
		int	start
	)

References _current_data_size, _is_full, _row_count, _row_offsets, _rows, createRow(), getMaxDataSize(), and isFull().

Referenced by CoGaDB::RowTable::load().

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char * CoGaDB::RowPage::getData

(

)

const

References _rows.

unsigned short CoGaDB::RowPage::getDataSize

(

)

const

References _current_data_size.

unsigned short CoGaDB::RowPage::getMaxDataSize

(

)

const

Referenced by fillPage(), and RowPage().

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char * CoGaDB::RowPage::getStringFromPage	(	BufferObject *	bo,
		int	index,
		unsigned short &	valueSize
	)		[private]

Gets from a buffered page the string at 'index'. Also results the size of the string in bytes.

References count(), CoGaDB::BufferObject::getPage(), and CoGaDB::BufferObject::next().

Referenced by getValueFromPage().

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char * CoGaDB::RowPage::getValue	(	unsigned int	page_row,
		unsigned int	col,
		unsigned short &	length
	)		const

References _col_count, _row_offsets, and _rows.

char * CoGaDB::RowPage::getValueFromPage	(	BufferObject *	bo,
		int	index,
		unsigned short &	valueSize
	)		[private]

Gets from a buffered page the value at 'index'. Also results the size of the value in bytes.

References count(), CoGaDB::BufferObject::getPage(), getStringFromPage(), CoGaDB::BufferObject::next(), and CoGaDB::VARCHAR.

Referenced by createRow().

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bool CoGaDB::RowPage::isFull

(

)

const

References _is_full.

Referenced by fillPage().

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RowPage & CoGaDB::RowPage::operator=

(

const RowPage &

)

void CoGaDB::RowPage::print

(

const TableSchema &

schema

)

const

References _current_data_size, _row_count, _row_offsets, _rows, CoGaDB::BOOLEAN, CoGaDB::FLOAT, CoGaDB::INT, and CoGaDB::VARCHAR.

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Member Data Documentation

unsigned short CoGaDB::RowPage::_col_count [private]

Number of columns for this rows.

Referenced by getValue().

unsigned short CoGaDB::RowPage::_current_data_size [private]

The current data size of all rows (_rows) in bytes.

Referenced by fillPage(), getDataSize(), and print().

bool CoGaDB::RowPage::_is_full [private]

true, if the page can't hold a row anymore

Referenced by fillPage(), and isFull().

unsigned short CoGaDB::RowPage::_row_count [private]

Number of rows on this page.

Referenced by count(), fillPage(), and print().

std::vector<unsigned short> CoGaDB::RowPage::_row_offsets [private]

Holds the offsets for each row.

Referenced by fillPage(), getValue(), print(), and RowPage().

char* CoGaDB::RowPage::_rows [private]

Represents the rwos as bytes.

Referenced by fillPage(), getData(), getValue(), print(), and RowPage().

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The documentation for this class was generated from the following files:

• /home/sebastian/gpudbms/trunk/cogadb/include/persistence/row_page.hpp
• /home/sebastian/gpudbms/trunk/cogadb/src/persistence/row_page.cpp