ddl::Sequence Struct Reference

Generate the next autoinc based on a snapshot of the session auto_increment_increment and auto_increment_offset variables. More...

#include <ddl0ddl.h>

Public Member Functions
	Sequence (THD *thd, ulonglong start_value, ulonglong max_value) noexcept
	Constructor. More...
	~Sequence ()=default
	Destructor. More...
ulonglong	operator++ (int) noexcept
	Postfix increment. More...
bool	eof () const noexcept
	Check if the autoinc "sequence" is exhausted. More...
ddl::Sequence &	operator= (const ddl::Sequence &rhs) noexcept
	Assignment operator to copy the sequence values. More...
ulonglong	last () const noexcept

Public Attributes
const ulonglong	m_max_value {}
	Maximum column value if adding an AUTOINC column else 0. More...
ulong	m_increment {}
	Value of auto_increment_increment. More...
ulong	m_offset {}
	Value of auto_increment_offset. More...
ulonglong	m_next_value {}
	Next value in the sequence. More...
bool	m_eof {}
	true if no more values left in the sequence More...

Detailed Description

Generate the next autoinc based on a snapshot of the session auto_increment_increment and auto_increment_offset variables.

Assignment operator would be used during the inplace_alter_table() phase only

Constructor & Destructor Documentation

Sequence()

ddl::Sequence::Sequence ( THD *  thd, ulonglong  start_value, ulonglong  max_value  )

noexcept

Constructor.

Parameters

[in,out]	thd	The session
[in]	start_value	The lower bound
[in]	max_value	The upper bound (inclusive)

~Sequence()

ddl::Sequence::~Sequence ( )

default

Destructor.

Member Function Documentation

eof()

bool ddl::Sequence::eof ( ) const

inlinenoexcept

Check if the autoinc "sequence" is exhausted.

Returns

true if the sequence is exhausted

last()

ulonglong ddl::Sequence::last ( ) const

inlinenoexcept

Returns

the next value in the sequence

operator++()

ulonglong ddl::Sequence::operator++ ( int  )

noexcept

Postfix increment.

Returns

the value to insert

operator=()

ddl::Sequence & ddl::Sequence::operator= ( const ddl::Sequence &  rhs )

inlinenoexcept

Assignment operator to copy the sequence values.

Parameters

[in]

rhs

Sequence to copy from

Member Data Documentation

m_eof

bool ddl::Sequence::m_eof {}

true if no more values left in the sequence

m_increment

ulong ddl::Sequence::m_increment {}

Value of auto_increment_increment.

m_max_value

const ulonglong ddl::Sequence::m_max_value {}

Maximum column value if adding an AUTOINC column else 0.

Once we reach the end of the sequence it will be set to ~0.

m_next_value

ulonglong ddl::Sequence::m_next_value {}

Next value in the sequence.

m_offset

ulong ddl::Sequence::m_offset {}

Value of auto_increment_offset.

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

• storage/innobase/include/ddl0ddl.h
• storage/innobase/ddl/ddl0ctx.cc