temptable::Cell Class Reference

A cell is the intersection of a row and a column. More...

#include <cell.h>

Public Member Functions
	Cell (bool is_null, uint32_t data_length, const unsigned char *data)
	Constructor. More...
bool	is_null () const
	Check if this cell is NULL. More...
uint32_t	data_length () const
	Get the length of the user data. More...
const unsigned char *	data () const
	Get a pointer to the user data inside the row. More...

Private Attributes
const bool	m_is_null
	Designate whether the cell is NULL. More...
const uint32_t	m_data_length
	Length of the user data pointed by m_data in bytes. More...
const unsigned char *const	m_data
	User data. More...

Detailed Description

A cell is the intersection of a row and a column.

In the handler interface row format (what is provided to the write_row() handler method) a cell may occupy too much space - in the case of a VARCHAR(N) column it will occupy N bytes, even if a shorter string is stored in this particular cell. So, our cell is derived from the above, but does not occupy unnecessary space.

This class is just an interpreter - it does not store the actual data, which is stored in the Row class, allocated at once for all the cells of a row.

Constructor & Destructor Documentation

Cell()

temptable::Cell::Cell ( bool  is_null, uint32_t  data_length, const unsigned char *  data  )

inline

Constructor.

Parameters

[in]	is_null	Designate whether this cell is NULL.
[in]	data_length	Length of the user data in bytes (no metadata or any leading bytes to designate the length. Just the user data.
[in]	data	Pointer to the user data. It is not copied inside this newly created Cell object, so it must remain valid for the lifetime of this object.

Member Function Documentation

data()

const unsigned char * temptable::Cell::data ( ) const

inline

Get a pointer to the user data inside the row.

Returns

a pointer

data_length()

uint32_t temptable::Cell::data_length ( ) const

inline

Get the length of the user data.

Returns

length in bytes

is_null()

bool temptable::Cell::is_null ( ) const

inline

Check if this cell is NULL.

Returns

true if NULL

Member Data Documentation

m_data

const unsigned char* const temptable::Cell::m_data

private

User data.

m_data_length

const uint32_t temptable::Cell::m_data_length

private

Length of the user data pointed by m_data in bytes.

m_is_null

const bool temptable::Cell::m_is_null

private

Designate whether the cell is NULL.

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

• storage/temptable/include/temptable/cell.h