Represents SHOW STATUS statement. More...

#include <sql_show.h>

Inheritance diagram for Sql_cmd_show_status:

Public Member Functions
	Sql_cmd_show_status ()

bool	execute (THD *thd) override
	Execute a DML statement. More...

Public Member Functions inherited from Sql_cmd_show
	Sql_cmd_show (enum_sql_command sql_command)

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

virtual bool	check_parameters (THD *)

bool	precheck (THD *thd) override
	Generally, the SHOW commands do not distinguish precheck and regular check. More...

bool	check_privileges (THD *) override
	Perform an authorization check for a prepared SELECT statement. More...

Public Member Functions inherited from Sql_cmd_select
	Sql_cmd_select (Query_result *result_arg)

bool	is_data_change_stmt () const override

bool	accept (THD thd, Select_lex_visitor visitor) override

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

Public Member Functions inherited from Sql_cmd_dml
bool	prepare (THD *thd) override
	Command-specific resolving (doesn't include LEX::prepare()) More...

bool	is_dml () const override

bool	is_single_table_plan () const override

Query_result *	query_result () const

void	set_query_result (Query_result *result)
	Set query result object for this query statement. More...

void	set_lazy_result ()
	Signal that root result object needs preparing in next execution. More...

Public Member Functions inherited from Sql_cmd
bool	needs_explicit_preparation () const

bool	is_regular () const

bool	is_prepared () const

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

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 ()

Additional Inherited Members
Protected Member Functions inherited from Sql_cmd_select
bool	may_use_cursor () const override

bool	prepare_inner (THD *thd) override
	Prepare a SELECT statement. More...

Protected Member Functions inherited from Sql_cmd_dml
	Sql_cmd_dml ()

bool	is_empty_query () const

void	set_empty_query ()
	Set statement as returning no data. More...

bool	check_all_table_privileges (THD *thd)
	Read and check privileges for all tables in a DML statement. More...

virtual bool	execute_inner (THD *thd)
	The inner parts of query optimization and execution. More...

virtual bool	restore_cmd_properties (THD *thd)
	Restore command properties before execution. More...

virtual bool	save_cmd_properties (THD *thd)
	Save command properties, such as prepared query details and table props. More...

const MYSQL_LEX_CSTRING *	get_eligible_secondary_engine () const
	Helper function that checks if the command is eligible for secondary engine and if that's true returns the name of that eligible secondary storage engine. More...

Protected Member Functions inherited from Sql_cmd
	Sql_cmd ()

virtual	~Sql_cmd ()

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

Protected Attributes inherited from Sql_cmd_show
enum_sql_command	m_sql_command

Protected Attributes inherited from Sql_cmd_dml
LEX *	lex
	Pointer to LEX for this statement. More...

Query_result *	result
	Pointer to object for handling of the result. More...

bool	m_empty_query
	True if query will produce no rows. More...

bool	m_lazy_result
	True: prepare query result on next execution. More...

Detailed Description

Represents SHOW STATUS statement.

Constructor & Destructor Documentation

◆ Sql_cmd_show_status()

Sql_cmd_show_status::Sql_cmd_show_status ( )

inline

Member Function Documentation

◆ execute()

bool Sql_cmd_show_status::execute ( THD * thd )

overridevirtual

Execute a DML statement.

Parameters

thd	thread handler

Returns: false if success, true if error

Processing a statement goes through 6 phases (parsing is already done)

Prelocking
Preparation
Locking of tables
Optimization
Execution or explain
Cleanup

If the statement is already prepared, this step is skipped.

The queries handled by this function are:

SELECT INSERT ... SELECT INSERT ... VALUES REPLACE ... SELECT REPLACE ... VALUES UPDATE (single-table and multi-table) DELETE (single-table and multi-table) DO

Reimplemented from Sql_cmd_show.

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

sql/sql_show.h
sql/sql_show.cc

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ Sql_cmd_show_status()

Member Function Documentation

◆ execute()