#include <query_result.h>

Inheritance diagram for Query_result:

Public Member Functions
	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	need_explain_interceptor () const

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

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

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

virtual uint	field_count (const mem_root_deque< Item * > &fields) const

virtual bool	send_result_set_metadata (THD thd, const mem_root_deque< Item > &list, uint flags)=0

virtual bool	send_data (THD thd, const mem_root_deque< Item > &items)=0

virtual bool	send_eof (THD *thd)=0

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

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

Public Attributes
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
Query_expression *	unit

Constructor & Destructor Documentation

◆ Query_result()

Query_result::Query_result ( )

inline

◆ ~Query_result()

virtual Query_result::~Query_result ( )

virtualdefault

Member Function Documentation

◆ abort_result_set()

virtual void Query_result::abort_result_set ( THD * )

inlinevirtual

Reimplemented in Query_result_do, Query_result_send, Query_result_insert, Query_result_create, and Query_result_union_direct.

◆ change_query_result()

virtual bool Query_result::change_query_result	(	THD *	,
		Query_result *
	)

inlinevirtual

Change wrapped Query_result.

Replace the wrapped query result object with new_result and call prepare() on new_result.

This base class implementation doesn't wrap other Query_results.

Return values

false	Success
true	Error

Reimplemented in Query_result_union_direct.

◆ check_supports_cursor()

virtual bool Query_result::check_supports_cursor ( ) const

inlinevirtual

Check if this query result set supports cursors.

Returns: false if success, true if error

Reimplemented in Query_result_send, Query_result_to_file, Query_dumpvar, Query_result_materialize, Query_result_do, and Query_result_union_direct.

◆ cleanup()

virtual void Query_result::cleanup ( )

inlinevirtual

Cleanup after this execution.

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

Reimplemented in Query_result_max_min_subquery, Query_result_explain, Query_result_send, Query_result_to_file, Query_result_export, Query_dumpvar, Query_result_materialize, Query_result_do, Query_result_insert, Query_result_union_direct, Query_result_union, and Query_result_update.

◆ create_table_for_query_block()

virtual bool Query_result::create_table_for_query_block ( THD * )

inlinevirtual

Create table, only needed to support CREATE TABLE ... SELECT.

Reimplemented in Query_result_create.

◆ cursor()

virtual Server_side_cursor * Query_result::cursor ( ) const

inlinevirtual

Returns: server side cursor, if associated with query result

Reimplemented in Query_result_materialize.

◆ field_count()

uint Query_result::field_count ( const mem_root_deque< Item * > & fields ) const

virtual

Reimplemented in Query_result_null, Query_result_interceptor, and Query_result_union_direct.

◆ is_interceptor()

virtual bool Query_result::is_interceptor ( ) const

inlinevirtual

Checks if this Query_result intercepts and transforms the result set.

Returns: true if it is an interceptor, false otherwise

Reimplemented in Query_result_interceptor.

◆ need_explain_interceptor()

virtual bool Query_result::need_explain_interceptor ( ) const

inlinevirtual

Returns: true if an interceptor object is needed for EXPLAIN

Reimplemented in anonymous_namespace{sql_delete.cc}::Query_result_delete, Query_result_insert, and Query_result_update.

◆ needs_file_privilege()

virtual bool Query_result::needs_file_privilege ( ) const

inlinevirtual

Reimplemented in Query_result_to_file.

◆ prepare()

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

inlinevirtual

Perform preparation specific to the query expression or DML statement.

Returns: false if success, true if error

Reimplemented in Query_result_explain, Query_result_export, Query_result_dump, Query_dumpvar, sp_cursor::Query_fetch_into_spvars, Query_result_materialize, Query_result_insert, Query_result_create, Query_result_union, and Query_result_update.

◆ reset()

virtual bool Query_result::reset ( void )

inlinevirtual

Cleanup after one execution of the unit, to be ready for a next execution inside the same statement.

Returns: true if error

Reimplemented in Query_result_union.

◆ send_data()

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

pure virtual

Implemented in anonymous_namespace{sql_delete.cc}::Query_result_delete, Query_result_union_direct, Query_result_scalar_subquery, Query_result_max_min_subquery, Query_result_exists_subquery, Query_result_null, Query_result_send, Query_result_export, Query_result_dump, Query_dumpvar, sp_cursor::Query_fetch_into_spvars, Query_result_do, Query_result_insert, anonymous_namespace{sql_prepare.cc}::Query_fetch_protocol_binary, Query_result_union, Query_result_update, and Query_result_subquery.

◆ send_eof()

virtual bool Query_result::send_eof ( THD * thd )

pure virtual

Implemented in Query_result_null, Query_result_subquery, sp_cursor::Query_fetch_into_spvars, Query_result_union_direct, Query_result_send, Query_result_to_file, Query_dumpvar, anonymous_namespace{sql_delete.cc}::Query_result_delete, Query_result_do, Query_result_insert, Query_result_create, anonymous_namespace{sql_prepare.cc}::Query_fetch_protocol_binary, Query_result_union, and Query_result_update.

◆ send_result_set_metadata()

virtual bool Query_result::send_result_set_metadata	(	THD *	thd,
		const mem_root_deque< Item * > &	list,
		uint	flags
	)

pure virtual

Implemented in Query_result_null, Query_result_interceptor, Query_result_do, Query_result_union_direct, Query_result_send, Query_result_materialize, and anonymous_namespace{sql_prepare.cc}::Query_fetch_protocol_binary.

◆ set_limit()

virtual void Query_result::set_limit ( ha_rows )

inlinevirtual

Only overridden (and non-empty) for Query_result_union, q.v.

Reimplemented in Query_result_union.

◆ start_execution()

virtual bool Query_result::start_execution ( THD * )

inlinevirtual

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 in Query_result_explain, Query_result_export, Query_result_dump, Query_result_materialize, Query_result_insert, Query_result_create, Query_result_union_direct, and Query_result_update.

Member Data Documentation

◆ estimated_cost

double Query_result::estimated_cost

Cost to execute the subquery which produces this result.

Valid only for materialized derived tables/views.

◆ estimated_rowcount

ha_rows Query_result::estimated_rowcount

Number of records estimated in this result.

Valid only for materialized derived tables/views.

◆ unit

Query_expression* Query_result::unit

protected

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

sql/query_result.h
sql/query_result.cc

Public Member Functions

Public Attributes

Protected Attributes

Constructor & Destructor Documentation

◆ Query_result()

◆ ~Query_result()

Member Function Documentation

◆ abort_result_set()

◆ change_query_result()

◆ check_supports_cursor()

◆ cleanup()

◆ create_table_for_query_block()

◆ cursor()

◆ field_count()

◆ is_interceptor()

◆ need_explain_interceptor()

◆ needs_file_privilege()

◆ prepare()

◆ reset()

◆ send_data()

◆ send_eof()

◆ send_result_set_metadata()

◆ set_limit()

◆ start_execution()

Member Data Documentation

◆ estimated_cost

◆ estimated_rowcount

◆ unit