oceanbase::TrxIterator类 参考

merge TrxInnerMapIterator and ObUserIterator 更多...

类 oceanbase::TrxIterator 继承关系图:

Public 成员函数
	TrxIterator (ObLsmIterator *left, ObLsmIterator *right)
bool	valid () const override
	Checks if the iterator is currently positioned at a valid key-value pair. 更多...
void	seek_to_first () override
	Positions the iterator at the first key-value pair in the source. 更多...
void	seek_to_last () override
	Positions the iterator at the last key-value pair in the source. 更多...
void	seek (const string_view &key) override
	Positions the iterator at the first entry with a key greater than or equal to the specified key. 更多...
void	next () override
	Moves the iterator to the next key-value pair in the source. 更多...
string_view	key () const override
	Returns the key of the current entry the iterator is positioned at. 更多...
string_view	value () const override
	Returns the value of the current entry the iterator is positioned at. 更多...
Public 成员函数 继承自 oceanbase::ObLsmIterator
	ObLsmIterator (const ObLsmIterator &)=delete
ObLsmIterator &	operator= (const ObLsmIterator &)=delete
virtual bool	valid () const =0
	Checks if the iterator is currently positioned at a valid key-value pair. 更多...
virtual void	next ()=0
	Moves the iterator to the next key-value pair in the source. 更多...
virtual string_view	key () const =0
	Returns the key of the current entry the iterator is positioned at. 更多...
virtual string_view	value () const =0
	Returns the value of the current entry the iterator is positioned at. 更多...
virtual void	seek (const string_view &k)=0
	Positions the iterator at the first entry with a key greater than or equal to the specified key. 更多...
virtual void	seek_to_first ()=0
	Positions the iterator at the first key-value pair in the source. 更多...
virtual void	seek_to_last ()=0
	Positions the iterator at the last key-value pair in the source. 更多...

Private 属性
unique_ptr< ObLsmIterator >	left_
unique_ptr< ObLsmIterator >	right_

详细描述

merge TrxInnerMapIterator and ObUserIterator

Merges two iterators of different types into one. If the two iterators have the same key, only produce the key once and prefer the entry from left.

成员函数说明

key()

string_view oceanbase::TrxIterator::key ( ) const

inlineoverridevirtual

Returns the key of the current entry the iterator is positioned at.

This method retrieves the key corresponding to the key-value pair at the current position of the iterator.

返回

A string_view containing the key of the current entry.

实现了 oceanbase::ObLsmIterator.

next()

void oceanbase::TrxIterator::next ( )

inlineoverridevirtual

Moves the iterator to the next key-value pair in the source.

实现了 oceanbase::ObLsmIterator.

seek()

void oceanbase::TrxIterator::seek ( const string_view &  k )

inlineoverridevirtual

Positions the iterator at the first entry with a key greater than or equal to the specified key.

参数

k	The key to search for.

实现了 oceanbase::ObLsmIterator.

seek_to_first()

void oceanbase::TrxIterator::seek_to_first ( )

inlineoverridevirtual

Positions the iterator at the first key-value pair in the source.

实现了 oceanbase::ObLsmIterator.

seek_to_last()

void oceanbase::TrxIterator::seek_to_last ( )

inlineoverridevirtual

Positions the iterator at the last key-value pair in the source.

实现了 oceanbase::ObLsmIterator.

valid()

bool oceanbase::TrxIterator::valid ( ) const

inlineoverridevirtual

Checks if the iterator is currently positioned at a valid key-value pair.

返回

true if the iterator is valid, false otherwise.

实现了 oceanbase::ObLsmIterator.

value()

string_view oceanbase::TrxIterator::value ( ) const

inlineoverridevirtual

Returns the value of the current entry the iterator is positioned at.

This method retrieves the value corresponding to the key-value pair at the current position of the iterator.

返回

A string_view containing the value of the current entry.

实现了 oceanbase::ObLsmIterator.

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该类的文档由以下文件生成:

• src/oblsm/ob_lsm_transaction.cpp