#include <sql_update.h>

Inheritance diagram for Query_result_update:

Public Member Functions
	Query_result_update (mem_root_deque< Item * > field_list, mem_root_deque< Item > *value_list)

bool	need_explain_interceptor () const override

bool	prepare (THD thd, const mem_root_deque< Item > &list, Query_expression *u) override
	Perform preparation specific to the query expression or DML statement. More...

bool	optimize ()
	Set up data structures for multi-table UPDATE. More...

bool	start_execution (THD *thd) override
	Prepare for execution of the query expression or DML statement. More...

bool	send_data (THD thd, const mem_root_deque< Item > &items) override

bool	do_updates (THD *thd)

bool	send_eof (THD *thd) override

void	cleanup () override
	Cleanup after this execution. More...

unique_ptr_destroy_only< RowIterator >	create_iterator (THD thd, MEM_ROOT mem_root, unique_ptr_destroy_only< RowIterator > source)

Public Member Functions inherited from Query_result_interceptor
	Query_result_interceptor ()

uint	field_count (const mem_root_deque< Item * > &) const override

bool	send_result_set_metadata (THD , const mem_root_deque< Item > &, uint) override

bool	is_interceptor () const final
	Checks if this Query_result intercepts and transforms the result set. More...

Public Member Functions inherited from Query_result
	Query_result ()

virtual	~Query_result ()=default

virtual bool	needs_file_privilege () const

virtual bool	change_query_result (THD , Query_result )
	Change wrapped Query_result. More...

virtual bool	create_table_for_query_block (THD *)
	Create table, only needed to support CREATE TABLE ... SELECT. More...

virtual bool	check_supports_cursor () const
	Check if this query result set supports cursors. More...

virtual void	abort_result_set (THD *)

virtual bool	reset ()
	Cleanup after one execution of the unit, to be ready for a next execution inside the same statement. More...

virtual void	set_limit (ha_rows)
	Only overridden (and non-empty) for Query_result_union, q.v. More...

virtual Server_side_cursor *	cursor () const

Private Attributes
uint	update_table_count {0}
	Number of tables being updated. More...

Table_ref *	update_tables {nullptr}
	Pointer to list of updated tables, linked via 'next_local'. More...

TABLE **	tmp_tables {nullptr}
	Array of references to temporary tables used to store cached updates. More...

Temp_table_param *	tmp_table_param {nullptr}
	Array of parameter structs for creation of temporary tables. More...

TABLE *	main_table {nullptr}
	The first table in the join operation. More...

TABLE *	table_to_update {nullptr}
	In a multi-table update, this is equal to the first table in the join operation (main_table) if that table can be updated on the fly while scanning it. More...

const mem_root_deque< Item * > *	fields
	List of pointers to fields to update, in order from statement. More...

const mem_root_deque< Item * > *	values
	List of pointers to values to update with, in order from statement. More...

mem_root_deque< Item * > **	fields_for_table
	The fields list decomposed into separate lists per table. More...

mem_root_deque< Item * > **	values_for_table
	The values list decomposed into separate lists per table. More...

List< TABLE >	unupdated_check_opt_tables
	List of tables referenced in the CHECK OPTION condition of the updated view excluding the updated table. More...

Copy_field *	copy_field {nullptr}
	??? More...

COPY_INFO **	update_operations {nullptr}
	Array of update operations, arranged per updated table. More...

Additional Inherited Members
Public Attributes inherited from Query_result
ha_rows	estimated_rowcount
	Number of records estimated in this result. More...

double	estimated_cost
	Cost to execute the subquery which produces this result. More...

Protected Attributes inherited from Query_result
Query_expression *	unit

Constructor & Destructor Documentation

◆ Query_result_update()

Query_result_update::Query_result_update	(	mem_root_deque< Item * > *	field_list,
		mem_root_deque< Item * > *	value_list
	)

inline

Member Function Documentation

◆ cleanup()

void Query_result_update::cleanup ( void )

overridevirtual

Cleanup after this execution.

Completes the execution and resets object before next execution of a prepared statement/stored procedure.

Reimplemented from Query_result.

◆ create_iterator()

unique_ptr_destroy_only< RowIterator > Query_result_update::create_iterator	(	THD *	thd,
		MEM_ROOT *	mem_root,
		unique_ptr_destroy_only< RowIterator >	source
	)

◆ do_updates()

bool Query_result_update::do_updates ( THD * thd )

◆ need_explain_interceptor()

bool Query_result_update::need_explain_interceptor ( ) const

inlineoverridevirtual

Returns: true if an interceptor object is needed for EXPLAIN

Reimplemented from Query_result.

◆ optimize()

bool Query_result_update::optimize ( )

Set up data structures for multi-table UPDATE.

IMPLEMENTATION

Update first table in join on the fly, if possible
Create temporary tables to store changed values for all other tables that are updated (and main_table if the above doesn't hold).

◆ prepare()

bool Query_result_update::prepare	(	THD *	,
		const mem_root_deque< Item * > &	,
		Query_expression *	u
	)

overridevirtual

Perform preparation specific to the query expression or DML statement.

Returns: false if success, true if error

Reimplemented from Query_result.

◆ send_data()

bool Query_result_update::send_data	(	THD *	thd,
		const mem_root_deque< Item * > &	items
	)

overridevirtual

Implements Query_result.

◆ send_eof()

bool Query_result_update::send_eof ( THD * thd )

overridevirtual

Implements Query_result.

◆ start_execution()

bool Query_result_update::start_execution ( THD * )

overridevirtual

Prepare for execution of the query expression or DML statement.

Generally, this will have an implementation only for outer-most Query_block objects, such as data change statements (for preparation of the target table(s)) or dump statements (for preparation of target file).

Returns: false if success, true if error

Reimplemented from Query_result.

Member Data Documentation

◆ copy_field

Copy_field* Query_result_update::copy_field {nullptr}

private

???

◆ fields

const mem_root_deque<Item *>* Query_result_update::fields

private

List of pointers to fields to update, in order from statement.

◆ fields_for_table

mem_root_deque<Item *>** Query_result_update::fields_for_table

private

The fields list decomposed into separate lists per table.

◆ main_table

TABLE* Query_result_update::main_table {nullptr}

private

The first table in the join operation.

◆ table_to_update

TABLE* Query_result_update::table_to_update {nullptr}

private

In a multi-table update, this is equal to the first table in the join operation (main_table) if that table can be updated on the fly while scanning it.

It is nullptr otherwise.

See also: safe_update_on_fly

◆ tmp_table_param

Temp_table_param* Query_result_update::tmp_table_param {nullptr}

private

Array of parameter structs for creation of temporary tables.

◆ tmp_tables

TABLE** Query_result_update::tmp_tables {nullptr}

private

Array of references to temporary tables used to store cached updates.

◆ unupdated_check_opt_tables

List<TABLE> Query_result_update::unupdated_check_opt_tables

private

List of tables referenced in the CHECK OPTION condition of the updated view excluding the updated table.

◆ update_operations

COPY_INFO** Query_result_update::update_operations {nullptr}

private

Array of update operations, arranged per updated table.

For each updated table in the multiple table update statement, a COPY_INFO pointer is present at the table's position in this array.

The array is allocated and populated during Query_result_update::prepare(). The position that each table is assigned is also given here and is stored in the member TABLE::pos_in_table_list::shared. However, this is a publicly available field, so nothing can be trusted about its integrity.

This member is NULL when the Query_result_update is created.

See also: Query_result_update::prepare

◆ update_table_count

uint Query_result_update::update_table_count {0}

private

Number of tables being updated.

◆ update_tables

Table_ref* Query_result_update::update_tables {nullptr}

private

Pointer to list of updated tables, linked via 'next_local'.

◆ values

const mem_root_deque<Item *>* Query_result_update::values

private

List of pointers to values to update with, in order from statement.

◆ values_for_table

mem_root_deque<Item *>** Query_result_update::values_for_table

private

The values list decomposed into separate lists per table.

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

sql/sql_update.h
sql/sql_update.cc

Public Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ Query_result_update()

Member Function Documentation

◆ cleanup()

◆ create_iterator()

◆ do_updates()

◆ need_explain_interceptor()

◆ optimize()

◆ prepare()

◆ send_data()

◆ send_eof()

◆ start_execution()

Member Data Documentation

◆ copy_field

◆ fields

◆ fields_for_table

◆ main_table

◆ table_to_update

◆ tmp_table_param

◆ tmp_tables

◆ unupdated_check_opt_tables

◆ update_operations

◆ update_table_count

◆ update_tables

◆ values

◆ values_for_table