storages::clickhouse::io::columns::ClickhouseColumn< ColumnType > Class Template Reference

Table of Contents

• Public Types
• Public Member Functions
• Detailed Description
• Member Typedef Documentation
• iterator
• Constructor & Destructor Documentation
• ClickhouseColumn()
• Member Function Documentation
• begin()
• end()
• Size()

Base class for every typed ClickHouse column. To add new columns one should derive from this class, define types aliases: More...

#include <userver/storages/clickhouse/io/columns/base_column.hpp>

Public Types
using	iterator = ColumnIterator< ColumnType >

Public Member Functions
	ClickhouseColumn (ColumnRef column)
iterator	begin () const
iterator	end () const
size_t	Size () const

Detailed Description

template<typename ColumnType>
class storages::clickhouse::io::columns::ClickhouseColumn< ColumnType >

Base class for every typed ClickHouse column. To add new columns one should derive from this class, define types aliases:

• cpp_type - to what C++ types are column values mapped,
• container_type (being std::vector<cpp_type>)

and implement 3 methods:

• ctor(ColumnRef) - column constructor,
• static ColumnRef Serialize(const container_type&) - constructs a column from C++ container,
• cpp_type ColumnIterator<YourColumnType>::DataHolder::Get()

see implementation of any of the existing columns for better understanding.

Definition at line 28 of file base_column.hpp.

Member Typedef Documentation

iterator

template<typename ColumnType >

using storages::clickhouse::io::columns::ClickhouseColumn< ColumnType >::iterator = ColumnIterator<ColumnType>

Definition at line 30 of file base_column.hpp.

Constructor & Destructor Documentation

ClickhouseColumn()

template<typename ColumnType >

storages::clickhouse::io::columns::ClickhouseColumn< ColumnType >::ClickhouseColumn ( ColumnRef  column )

inline

Definition at line 32 of file base_column.hpp.

Member Function Documentation

begin()

template<typename ColumnType >

iterator storages::clickhouse::io::columns::ClickhouseColumn< ColumnType >::begin ( ) const

inline

Definition at line 34 of file base_column.hpp.

end()

template<typename ColumnType >

iterator storages::clickhouse::io::columns::ClickhouseColumn< ColumnType >::end ( ) const

inline

Definition at line 36 of file base_column.hpp.

Size()

template<typename ColumnType >

size_t storages::clickhouse::io::columns::ClickhouseColumn< ColumnType >::Size ( ) const

inline

Definition at line 38 of file base_column.hpp.

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

• userver/storages/clickhouse/io/columns/base_column.hpp