#include <sql_update.h>

Inheritance diagram for Sql_cmd_update:

Public Member Functions
	Sql_cmd_update (bool multitable_arg, mem_root_deque< Item * > *update_values)

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

bool	is_single_table_plan () const override

Public Member Functions inherited from Sql_cmd_dml
virtual bool	is_data_change_stmt () const

bool	prepare (THD *thd) override
	Command-specific resolving (doesn't include LEX::prepare()) More...

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

bool	is_dml () const override

virtual bool	may_use_cursor () const

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

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 ()

Public Attributes
mem_root_deque< Item * >	original_fields
	The original list of fields to update, used for privilege checking. More...

mem_root_deque< Item * > *	update_value_list
	The values used to update fields. More...

Protected Member Functions
bool	precheck (THD *thd) override
	Perform a precheck of table privileges for the specific operation. More...

bool	check_privileges (THD *thd) override
	Check privileges on a prepared statement, called at start of execution of the statement. More...

bool	prepare_inner (THD *thd) override
	Perform the command-specific parts of DML command preparation, to be called from prepare() More...

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

Private Member Functions
bool	update_single_table (THD *thd)
	Perform an update to a set of rows in a single table. More...

bool	accept (THD thd, Select_lex_visitor visitor) override

bool	make_base_table_fields (THD thd, mem_root_deque< Item > *items)
	Convert list of fields to update to base table fields. More...

Private Attributes
bool	multitable

table_map	tables_for_update {0}
	Bitmap of all tables which are to be updated. More...

Additional Inherited Members
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...

Constructor & Destructor Documentation

◆ Sql_cmd_update()

Sql_cmd_update::Sql_cmd_update	(	bool	multitable_arg,
		mem_root_deque< Item * > *	update_values
	)

inline

Member Function Documentation

◆ accept()

bool Sql_cmd_update::accept	(	THD *	thd,
		Select_lex_visitor *	visitor
	)

overrideprivatevirtual

Reimplemented from Sql_cmd.

◆ check_privileges()

bool Sql_cmd_update::check_privileges ( THD * thd )

overrideprotectedvirtual

Check privileges on a prepared statement, called at start of execution of the statement.

Check that user has all relevant privileges to the statement, ie. INSERT privilege for columns inserted into, UPDATE privilege for columns that are updated, DELETE privilege for tables that are deleted from, SELECT privilege for columns that are referenced, etc.

Parameters

thd	thread handler

Returns: false if success, true if false

Implements Sql_cmd_dml.

◆ execute_inner()

bool Sql_cmd_update::execute_inner ( THD * thd )

overrideprotectedvirtual

The inner parts of query optimization and execution.

Execute a DML statement.

Single-table DML operations needs to reimplement this.

Parameters

thd	Thread handler

Returns: false on success, true on error

This is the default implementation for a DML statement and uses a nested-loop join processor per outer-most query block. The implementation is split in two: One for query expressions containing a single query block and one for query expressions containing multiple query blocks combined with UNION.

Reimplemented from Sql_cmd_dml.

◆ is_single_table_plan()

bool Sql_cmd_update::is_single_table_plan ( ) const

inlineoverridevirtual

Returns: true if implemented as single table plan, DML statement only

Reimplemented from Sql_cmd_dml.

◆ make_base_table_fields()

bool Sql_cmd_update::make_base_table_fields	(	THD *	thd,
		mem_root_deque< Item * > *	items
	)

private

Convert list of fields to update to base table fields.

Check that all fields are base table columns.

Replace columns from views with base table columns.

Parameters

thd	thread handler
items	Items for check

Returns: false if success, true if error (OOM)

◆ precheck()

bool Sql_cmd_update::precheck ( THD * thd )

overrideprotectedvirtual

Perform a precheck of table privileges for the specific operation.

Check that user has some relevant privileges for all tables involved in the statement, e.g. SELECT privileges for tables selected from, INSERT privileges for tables inserted into, etc. This function will also populate Table_ref::grant with all privileges the user has for each table, which is later used during checking of column privileges. Note that at preparation time, views are not expanded yet. Privilege checking is thus rudimentary and must be complemented with later calls to Query_block::check_view_privileges(). The reason to call this function at such an early stage is to be able to quickly reject statements for which the user obviously has insufficient privileges. This function is called before preparing the statement. The function must also be complemented with proper privilege checks for all involved columns (e.g. check_column_grant_*).

See also: also the function comment of Query_block::prepare(). During execution of a prepared statement, call check_privileges() instead.

Parameters

thd	thread handler

Returns: false if success, true if false

Implements Sql_cmd_dml.

◆ prepare_inner()

bool Sql_cmd_update::prepare_inner ( THD * thd )

overrideprotectedvirtual

Perform the command-specific parts of DML command preparation, to be called from prepare()

Parameters

thd	the current thread

Returns: false if success, true if error

Implements Sql_cmd_dml.

◆ sql_command_code()

enum_sql_command Sql_cmd_update::sql_command_code ( ) const

inlineoverridevirtual

Return the command code for this statement.

Implements Sql_cmd.

◆ update_single_table()

bool Sql_cmd_update::update_single_table ( THD * thd )

private

Perform an update to a set of rows in a single table.

Parameters

thd	Thread handler

Returns: false if success, true if error

< Flag for fatal errors

read_removal is only used by NDB storage engine

Member Data Documentation

◆ multitable

bool Sql_cmd_update::multitable

private

◆ original_fields

mem_root_deque<Item *> Sql_cmd_update::original_fields

The original list of fields to update, used for privilege checking.

◆ tables_for_update

table_map Sql_cmd_update::tables_for_update {0}

private

Bitmap of all tables which are to be updated.

◆ update_value_list

mem_root_deque<Item *>* Sql_cmd_update::update_value_list

The values used to update fields.

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

sql/sql_update.h
sql/sql_update.cc

Public Member Functions

Public Attributes

Protected Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ Sql_cmd_update()

Member Function Documentation

◆ accept()

◆ check_privileges()

◆ execute_inner()

◆ is_single_table_plan()

◆ make_base_table_fields()

◆ precheck()

◆ prepare_inner()

◆ sql_command_code()

◆ update_single_table()

Member Data Documentation

◆ multitable

◆ original_fields

◆ tables_for_update

◆ update_value_list