Ha_trx_info Class Reference

Either statement transaction or normal transaction - related thread-specific storage engine data. More...

#include <transaction_info.h>

Public Member Functions
void	register_ha (Transaction_ctx::THD_TRANS *trans, handlerton *ht_arg)
	Register this storage engine in the given transaction context. More...
void	reset ()
	Clear, prepare for reuse. More...
	Ha_trx_info ()
void	set_trx_read_write ()
bool	is_trx_read_write () const
bool	is_started () const
void	coalesce_trx_with (const Ha_trx_info *stmt_trx)
	Mark this transaction read-write if the argument is read-write. More...
void	coalesce_trx_with (const Ha_trx_info &stmt_trx)
handlerton *	ht () const

Private Types
enum	{ TRX_READ_ONLY = 0 , TRX_READ_WRITE = 1 }

Private Attributes
Ha_trx_info *	m_next
	Auxiliary, used for ha_list management. More...
handlerton *	m_ht
	Although a given Ha_trx_info instance is currently always used for the same storage engine, 'ht' is not-NULL only when the corresponding storage is a part of a transaction. More...
uchar	m_flags
	Transaction flags related to this engine. More...

Friends
class	Ha_trx_info_list

Detailed Description

Either statement transaction or normal transaction - related thread-specific storage engine data.

If a storage engine participates in a statement/transaction, an instance of this class is present in thd->m_transaction.m_scope_info[STMT|SESSION].ha_list. The addition this list is made by trans_register_ha().

When it's time to commit or rollback, each element of ha_list is used to access storage engine's prepare()/commit()/rollback() methods, and also to evaluate if a full two phase commit is necessary.

See also

General description of transaction handling in handler.cc.

Member Enumeration Documentation

anonymous enum

anonymous enum

private

Enumerator
TRX_READ_ONLY
TRX_READ_WRITE

Constructor & Destructor Documentation

Ha_trx_info()

Ha_trx_info::Ha_trx_info ( )

inline

Member Function Documentation

coalesce_trx_with() [1/2]

void Ha_trx_info::coalesce_trx_with ( const Ha_trx_info &  stmt_trx )

inline

coalesce_trx_with() [2/2]

void Ha_trx_info::coalesce_trx_with ( const Ha_trx_info *  stmt_trx )

inline

Mark this transaction read-write if the argument is read-write.

ht()

handlerton * Ha_trx_info::ht ( ) const

inline

is_started()

bool Ha_trx_info::is_started ( ) const

inline

is_trx_read_write()

bool Ha_trx_info::is_trx_read_write ( ) const

inline

register_ha()

void Ha_trx_info::register_ha ( Transaction_ctx::THD_TRANS *  trans, handlerton *  ht_arg  )

inline

Register this storage engine in the given transaction context.

reset()

void Ha_trx_info::reset ( void  )

inline

Clear, prepare for reuse.

set_trx_read_write()

void Ha_trx_info::set_trx_read_write ( )

inline

Friends And Related Function Documentation

Ha_trx_info_list

friend class Ha_trx_info_list

friend

Member Data Documentation

m_flags

uchar Ha_trx_info::m_flags

private

Transaction flags related to this engine.

Not-null only if this instance is a part of transaction. May assume a combination of enum values above.

m_ht

handlerton* Ha_trx_info::m_ht

private

Although a given Ha_trx_info instance is currently always used for the same storage engine, 'ht' is not-NULL only when the corresponding storage is a part of a transaction.

m_next

Ha_trx_info* Ha_trx_info::m_next

private

Auxiliary, used for ha_list management.

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

• sql/transaction_info.h