Sql_cmd_truncate_table represents the TRUNCATE statement. More...

#include <sql_truncate.h>

Inheritance diagram for Sql_cmd_truncate_table:

Public Member Functions
	Sql_cmd_truncate_table ()=default
	Constructor, used to represent a TRUNCATE statement. More...

	~Sql_cmd_truncate_table () override=default

bool	execute (THD *) override
	Execute a TRUNCATE statement at runtime. More...

enum_sql_command	sql_command_code () const override
	Return the command code for this statement. More...

Public Member Functions inherited from Sql_cmd
bool	needs_explicit_preparation () const

bool	is_regular () const

bool	is_prepared () const

virtual bool	prepare (THD *)
	Prepare this SQL statement. More...

virtual bool	reprepare_on_execute_required () const
	Some SQL commands currently require re-preparation on re-execution of a prepared statement or stored procedure. More...

virtual void	cleanup (THD *)
	Command-specific reinitialization before execution of prepared statement. More...

void	set_owner (Prepared_statement *stmt)
	Set the owning prepared statement. More...

Prepared_statement *	owner () const
	Get the owning prepared statement. More...

void	set_as_part_of_sp ()
	Mark statement as part of procedure. More...

bool	is_part_of_sp () const

virtual bool	is_dml () const

virtual bool	is_single_table_plan () const

virtual bool	accept (THD , Select_lex_visitor )

virtual const MYSQL_LEX_CSTRING *	eligible_secondary_storage_engine () const
	Is this statement of a type and on a form that makes it eligible for execution in a secondary storage engine? More...

void	disable_secondary_storage_engine ()
	Disable use of secondary storage engines in this statement. More...

bool	secondary_storage_engine_disabled () const
	Has use of secondary storage engines been disabled for this statement? More...

void	use_secondary_storage_engine (const handlerton *hton)
	Mark the current statement as using a secondary storage engine. More...

bool	using_secondary_storage_engine () const
	Is this statement using a secondary storage engine? More...

const handlerton *	secondary_engine () const
	Get the handlerton of the secondary engine that is used for executing this statement, or nullptr if a secondary engine is not used. More...

void	set_optional_transform_prepared (bool value)

bool	is_optional_transform_prepared ()

Private Member Functions
bool	lock_table (THD , Table_ref )

void	truncate_base (THD , Table_ref )
	Optimized delete of all rows by doing a full generate of the base (non-temporary) table. More...

void	truncate_temporary (THD , Table_ref )
	Optimized delete of all rows by doing a full generate of the temporary table. More...

void	end_transaction (THD *, bool, bool)
	Completes transaction by attempting to binlog and commit if truncate has been successful so far. More...

void	cleanup_base (THD , const handlerton )
	Performs cleanup actions after truncate of a normal (non-temporary) table. More...

void	cleanup_temporary (THD , handlerton , const Table_ref &, Up_table *, const std::string &)
	Reopens a temporary table after truncate if supported. More...

Private Attributes
MDL_ticket *	m_ticket_downgrade = nullptr
	Set if a lock must be downgraded after truncate is done. More...

bool	m_error = true
	Track error status from functions called. More...

Additional Inherited Members
Protected Member Functions inherited from Sql_cmd
	Sql_cmd ()

virtual	~Sql_cmd ()

void	set_prepared ()
	Set this statement as prepared. More...

Detailed Description

Sql_cmd_truncate_table represents the TRUNCATE statement.

Constructor & Destructor Documentation

◆ Sql_cmd_truncate_table()

Sql_cmd_truncate_table::Sql_cmd_truncate_table ( )

default

Constructor, used to represent a TRUNCATE statement.

◆ ~Sql_cmd_truncate_table()

Sql_cmd_truncate_table::~Sql_cmd_truncate_table ( )

overridedefault

Member Function Documentation

◆ cleanup_base()

void Sql_cmd_truncate_table::cleanup_base	(	THD *	thd,
		const handlerton *	hton
	)

private

Performs cleanup actions after truncate of a normal (non-temporary) table.

Calls post_ddl hook, reopens locked tables in locked_tables mode and possibly downgrades a temporarily upgraded MDL.

◆ cleanup_temporary()

void Sql_cmd_truncate_table::cleanup_temporary	(	THD *	thd,
		handlerton *	hton,
		const Table_ref &	table_ref,
		Up_table *	tdef_holder_ptr,
		const std::string &	saved_path
	)

private

Reopens a temporary table after truncate if supported.

Deletes table and flags error if unuccessful.

◆ end_transaction()

void Sql_cmd_truncate_table::end_transaction	(	THD *	thd,
		bool	binlog_stmt,
		bool	binlog_is_trans
	)

private

Completes transaction by attempting to binlog and commit if truncate has been successful so far.

Rolls back if truncate has already failed, or if binlogging or commit fails.

◆ execute()

bool Sql_cmd_truncate_table::execute ( THD * thd )

overridevirtual

Execute a TRUNCATE statement at runtime.

Parameters

thd	The current thread.

Returns: false on success.

Implements Sql_cmd.

◆ lock_table()

bool Sql_cmd_truncate_table::lock_table	(	THD *	thd,
		Table_ref *	table_ref
	)

private

◆ sql_command_code()

enum_sql_command Sql_cmd_truncate_table::sql_command_code ( ) const

inlineoverridevirtual

Return the command code for this statement.

Implements Sql_cmd.

◆ truncate_base()

void Sql_cmd_truncate_table::truncate_base	(	THD *	thd,
		Table_ref *	table_ref
	)

private

Optimized delete of all rows by doing a full generate of the base (non-temporary) table.

Remarks: Will work even if the .MYI and .MYD files are destroyed. In other words, it works as long as the .FRM is intact and the engine supports re-create.

Parameters

thd	Thread context.
table_ref	Table list element for the table to be truncated.

◆ truncate_temporary()

void Sql_cmd_truncate_table::truncate_temporary	(	THD *	thd,
		Table_ref *	table_ref
	)

private

Optimized delete of all rows by doing a full generate of the temporary table.

Remarks: Will work even if the .MYI and .MYD files are destroyed. In other words, it works as long as the .FRM is intact and the engine supports re-create.

Parameters

thd	Thread context.
table_ref	Table list element for the table to be truncated.

Member Data Documentation

◆ m_error

bool Sql_cmd_truncate_table::m_error = true

private

Track error status from functions called.

◆ m_ticket_downgrade

MDL_ticket* Sql_cmd_truncate_table::m_ticket_downgrade = nullptr

private

Set if a lock must be downgraded after truncate is done.

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

sql/sql_truncate.h
sql/sql_truncate.cc

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ Sql_cmd_truncate_table()

◆ ~Sql_cmd_truncate_table()

Member Function Documentation

◆ cleanup_base()

◆ cleanup_temporary()

◆ end_transaction()

◆ execute()

◆ lock_table()

◆ sql_command_code()

◆ truncate_base()

◆ truncate_temporary()

Member Data Documentation

◆ m_error

◆ m_ticket_downgrade