Query_result_send Class Reference

#include <query_result.h>

Inheritance diagram for Query_result_send:

Public Member Functions
	Query_result_send ()
bool	send_result_set_metadata (THD *thd, const mem_root_deque< Item *> &list, uint flags) override
bool	send_data (THD *thd, const mem_root_deque< Item *> &items) override
bool	send_eof (THD *thd) override
bool	check_simple_select () const override
	Check if this query returns a result set and therefore is allowed in cursors and set an error message if it is not the case. More...
void	abort_result_set (THD *thd) override
void	cleanup (THD *) override
	Cleanup after this execution. More...
Public Member Functions inherited from Query_result
	Query_result ()
virtual	~Query_result ()
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 *> &, SELECT_LEX_UNIT *u)
	Perform preparation specific to the query expression or DML statement. More...
virtual bool	optimize ()
	Optimize the result processing of a query expression, applicable to data change operation (not simple select queries). More...
virtual bool	start_execution (THD *)
	Prepare for execution of the query expression or DML statement. More...
virtual uint	field_count (const mem_root_deque< Item *> &fields) const
virtual void	send_error (THD *, uint errcode, const char *err)
virtual bool	reset ()
	Cleanup after one execution of the unit, to be ready for a next execution inside the same statement. More...
void	begin_dataset ()
virtual const ha_rows *	row_count () const
virtual bool	is_interceptor () const
	Checks if this Query_result intercepts and transforms the result set. More...
virtual bool	immediate_update (TABLE_LIST *t) const
	If this Query_result performs modifications to tables: tells if it modifies the given table's row as it's read (a.k.a. More...

Private Attributes
bool	is_result_set_started
	True if we have sent result set metadata to the client. 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
SELECT_LEX_UNIT *	unit

Constructor & Destructor Documentation

Query_result_send()

Query_result_send::Query_result_send ( )

inline

Member Function Documentation

abort_result_set()

void Query_result_send::abort_result_set ( THD *  thd )

overridevirtual

Reimplemented from Query_result.

check_simple_select()

bool Query_result_send::check_simple_select ( ) const

inlineoverridevirtual

Check if this query returns a result set and therefore is allowed in cursors and set an error message if it is not the case.

Return values

false	success
true	error, an error message is set

Reimplemented from Query_result.

cleanup()

void Query_result_send::cleanup ( THD *  )

inlineoverridevirtual

Cleanup after this execution.

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

Reimplemented from Query_result.

send_data()

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

overridevirtual

Implements Query_result.

send_eof()

bool Query_result_send::send_eof ( THD *  thd )

overridevirtual

Implements Query_result.

send_result_set_metadata()

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

overridevirtual

Implements Query_result.

Member Data Documentation

is_result_set_started

bool Query_result_send::is_result_set_started

private

True if we have sent result set metadata to the client.

In this case the client always expects us to end the result set with an eof or error packet

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

• sql/query_result.h
• sql/query_result.cc