Server_side_cursor Class Reference

Server_side_cursor – an interface for materialized implementation of cursors. More...

#include <sql_cursor.h>

Inheritance diagram for Server_side_cursor:

Public Member Functions
	Server_side_cursor (Query_result *result_arg)
virtual bool	is_open () const =0
virtual bool	open (THD *thd)=0
virtual bool	fetch (ulong num_rows)=0
virtual void	close ()=0
virtual	~Server_side_cursor ()

Static Public Member Functions
static void *	operator new (size_t size, MEM_ROOT *mem_root, const std::nothrow_t &=std::nothrow) noexcept
static void	operator delete (void *, size_t)
static void	operator delete (void *, MEM_ROOT *, const std::nothrow_t &) noexcept

Public Attributes
MEM_ROOT	mem_root {key_memory_TABLE, 1024}
	For allocation of Handler objects for the temporary table. More...

Protected Attributes
Query_arena	m_arena
Query_result *	m_result
	Row destination used for fetch. More...

Detailed Description

Server_side_cursor – an interface for materialized implementation of cursors.

All cursors are self-contained (created in their own memory root). For that reason they must be deleted only using a pointer to Server_side_cursor, not to its base class.

Constructor & Destructor Documentation

Server_side_cursor()

Server_side_cursor::Server_side_cursor ( Query_result *  result_arg )

inline

~Server_side_cursor()

virtual Server_side_cursor::~Server_side_cursor ( )

inlinevirtual

Member Function Documentation

close()

virtual void Server_side_cursor::close ( )

pure virtual

Implemented in Materialized_cursor.

fetch()

virtual bool Server_side_cursor::fetch ( ulong  num_rows )

pure virtual

Implemented in Materialized_cursor.

is_open()

virtual bool Server_side_cursor::is_open ( ) const

pure virtual

Implemented in Materialized_cursor.

open()

virtual bool Server_side_cursor::open ( THD *  thd )

pure virtual

Implemented in Materialized_cursor.

operator delete() [1/2]

static void Server_side_cursor::operator delete ( void *  , MEM_ROOT *  , const std::nothrow_t &    )

inlinestaticnoexcept

operator delete() [2/2]

static void Server_side_cursor::operator delete ( void *  , size_t    )

inlinestatic

operator new()

static void * Server_side_cursor::operator new ( size_t  size, MEM_ROOT *  mem_root, const std::nothrow_t &  = std::nothrow  )

inlinestaticnoexcept

Member Data Documentation

m_arena

Query_arena Server_side_cursor::m_arena

protected

m_result

Query_result* Server_side_cursor::m_result

protected

Row destination used for fetch.

mem_root

MEM_ROOT Server_side_cursor::mem_root {key_memory_TABLE, 1024}

For allocation of Handler objects for the temporary table.

The prepared statement's mem_root cannot be used, since the handler may be created and deleted several times. The execution mem_root cannot be used since creation of and retrieval from a cursor are in different executions.

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

• sql/sql_cursor.h