anonymous_namespace{binlog.cc}::Row_data_memory Class Reference

Class to handle temporary allocation of memory for row data. More...

Public Member Functions
	Row_data_memory (TABLE *table, const uchar *data)
	Build an object to keep track of a block-local piece of memory for storing a row of data. More...
	Row_data_memory (TABLE *table, const uchar *data1, const uchar *data2, ulonglong value_options=0)
	~Row_data_memory ()
bool	has_memory () const
	Is there memory allocated? More...
uchar *	slot (uint s)

Private Member Functions
size_t	max_row_length (TABLE *table, const uchar *data, ulonglong value_options=0)
	Compute an upper bound on the amount of memory needed. More...
void	allocate_memory (TABLE *const table, const size_t total_length)

Private Attributes
bool	m_alloc_checked
bool	m_release_memory_on_destruction
uchar *	m_memory
uchar *	m_ptr [2]

Detailed Description

Class to handle temporary allocation of memory for row data.

The responsibilities of the class is to provide memory for packing one or two rows of packed data (depending on what constructor is called).

In order to make the allocation more efficient for rows without blobs, a pointer to the allocated memory is stored in the table structure for such rows. If memory for a table containing a blob field is requested, only memory for that is allocated, and subsequently released when the object is destroyed.

Constructor & Destructor Documentation

Row_data_memory() [1/2]

anonymous_namespace{binlog.cc}::Row_data_memory::Row_data_memory ( TABLE *  table, const uchar *  data  )

inline

Build an object to keep track of a block-local piece of memory for storing a row of data.

Parameters

table	Table where the pre-allocated memory is stored.
data	Pointer to the table record.

Row_data_memory() [2/2]

anonymous_namespace{binlog.cc}::Row_data_memory::Row_data_memory ( TABLE *  table, const uchar *  data1, const uchar *  data2, ulonglong  value_options = 0  )

inline

~Row_data_memory()

anonymous_namespace{binlog.cc}::Row_data_memory::~Row_data_memory ( )

inline

Member Function Documentation

allocate_memory()

void anonymous_namespace{binlog.cc}::Row_data_memory::allocate_memory ( TABLE *const  table, const size_t  total_length  )

inlineprivate

has_memory()

bool anonymous_namespace{binlog.cc}::Row_data_memory::has_memory ( ) const

inline

Is there memory allocated?

Return values

true	There is memory allocated
false	Memory allocation failed

max_row_length()

size_t anonymous_namespace{binlog.cc}::Row_data_memory::max_row_length ( TABLE *  table, const uchar *  data, ulonglong  value_options = 0  )

inlineprivate

Compute an upper bound on the amount of memory needed.

This may return an over-approximation.

Parameters

table	The table
data	The server's row record.
value_options	The value of @global.binlog_row_value_options

slot()

uchar * anonymous_namespace{binlog.cc}::Row_data_memory::slot ( uint  s )

inline

Member Data Documentation

m_alloc_checked

bool anonymous_namespace{binlog.cc}::Row_data_memory::m_alloc_checked

mutableprivate

m_memory

uchar* anonymous_namespace{binlog.cc}::Row_data_memory::m_memory

private

m_ptr

uchar* anonymous_namespace{binlog.cc}::Row_data_memory::m_ptr[2]

private

m_release_memory_on_destruction

bool anonymous_namespace{binlog.cc}::Row_data_memory::m_release_memory_on_destruction

private

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

• sql/binlog.cc