storages::postgres::Field Class Reference

#include <userver/storages/postgres/result_set.hpp>

Detailed Description

Accessor to a single field in a result set's row.

Definition at line 293 of file result_set.hpp.

Inheritance diagram for storages::postgres::Field:

Public Types
using	size_type = std::size_t

Public Member Functions
size_type	RowIndex () const
size_type	FieldIndex () const
Field metadata
std::string_view	Name () const
	Field name as named in query.
FieldDescription	Description () const
Oid	GetTypeOid () const

Data access
class	Row
bool	IsNull () const
template<typename T >
size_type	To (T &&val) const
template<typename T >
void	Coalesce (T &val, const T &default_val) const
template<typename T >
std::decay< T >::type	As () const
template<typename T >
std::decay< T >::type	Coalesce (const T &default_val) const
const io::TypeBufferCategory &	GetTypeBufferCategories () const
	Field (detail::ResultWrapperPtr res, size_type row, size_type col)

Iteration support
bool	IsValid () const
int	Compare (const Field &rhs) const
std::ptrdiff_t	Distance (const Field &rhs) const
Field &	Advance (std::ptrdiff_t)

Member Typedef Documentation

size_type

using storages::postgres::Field::size_type = std::size_t

Definition at line 295 of file result_set.hpp.

Constructor & Destructor Documentation

Field()

storages::postgres::Field::Field ( detail::ResultWrapperPtr res, size_type row, size_type col )

inlineprotected

Definition at line 356 of file result_set.hpp.

Member Function Documentation

As()

template<typename T >

std::decay< T >::type storages::postgres::Field::As ( ) const

inline

Convert the field's buffer into a C++ type.

Exceptions

FieldValueIsNull

If the field is null and the C++ type is not nullable.

Definition at line 335 of file result_set.hpp.

Coalesce() [1/2]

template<typename T >

std::decay< T >::type storages::postgres::Field::Coalesce ( const T & default_val ) const

inline

Convert the field's buffer into a C++ type. If the field is null, return default value.

Definition at line 344 of file result_set.hpp.

Coalesce() [2/2]

template<typename T >

void storages::postgres::Field::Coalesce ( T & val, const T & default_val ) const

inline

Read the field's buffer into user-provided variable. If the field is null, set the variable to the default value.

Definition at line 324 of file result_set.hpp.

FieldIndex()

size_type storages::postgres::Field::FieldIndex ( ) const

inline

Definition at line 298 of file result_set.hpp.

RowIndex()

size_type storages::postgres::Field::RowIndex ( ) const

inline

Definition at line 297 of file result_set.hpp.

To()

template<typename T >

size_type storages::postgres::Field::To ( T && val ) const

inline

Read the field's buffer into user-provided variable.

Exceptions

FieldValueIsNull

If the field is null and the C++ type is not nullable.

Definition at line 317 of file result_set.hpp.

Friends And Related Symbol Documentation

Row

friend class Row

friend

Definition at line 352 of file result_set.hpp.

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

• userver/storages/postgres/result_set.hpp