value Class Reference

Dynamically Typed Value Object. More...

Inheritance diagram for value:

Public Member Functions
	~value () noexcept
	Equivalent to sqlite3_value_free.
template<class T >
T	get () const noexcept
	Obtain value's content.
template<class T >
T	get (const char *type=nullptr) const noexcept
	Obtain a pointer stored in the value.
int	type () const noexcept
	Default datatype of the value.
unsigned	subtype () const noexcept
	Subtype of the value.
int	numeric_type () const noexcept
	Best numeric datatype of the value.
bool	nochange () const noexcept
	Whether the column is unchanged in an UPDATE against a virtual table.
bool	frombind () const noexcept
	Whether if value originated from a bound parameter
value *	in_first () const
	Get first element on the right-hand side of an IN constraint.
value *	in_next () const
	Get next element on the right-hand side of an IN constraint.
void	operator delete (void *) noexcept
	Operator delete for a fake pointer is no-op.
sqlite3_value *	c_ptr () const noexcept
	Access the real underlying SQLite type.

Static Public Member Functions
static std::unique_ptr< value >	dup (const value *src)
	Creates a new value by copying an original one.
static std::unique_ptr< value >	dup (const std::unique_ptr< value > &src)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
static value *	from (sqlite3_value *obj) noexcept
	Create fake pointer from the underlying SQLite one.

Detailed Description

Dynamically Typed Value Object.

This is a fake wrapper class for sqlite3_value.

#include <thinsqlitepp/value.hpp>

Constructor & Destructor Documentation

~value()

~value ( )

inlinenoexcept

Equivalent to sqlite3_value_free.

Since

SQLite 3.18

Member Function Documentation

dup()

static std::unique_ptr< value > dup ( const value * src )

inlinestatic

Creates a new value by copying an original one.

Equivalent to sqlite3_value_dup

Since

SQLite 3.18

Parameters

src	Original value. Can be nullptr

Returns

A new value object which is a copy of the original or nullptr if the original is nullptr

get() [1/2]

template<class T >

T get ( ) const

noexcept

Obtain value's content.

Wraps sqlite3_value_ function family. Unlike the C API you specify the desired type via T template parameter

Template Parameters

T	Desired output type. Must be one of: int int64_t double std::string_view std::u8string_view (if char8_t is supported by your compiler/library) blob_view

get() [2/2]

template<class T >

T get ( const char * type = nullptr ) const

inlinenoexcept

Obtain a pointer stored in the value.

Wraps sqlite3_value_pointer function.

Parameters

type	the "type name" of the stored pointer. If nullptr the result of typeid(T).name() is used.

See also

• statement::bind(int, T * , const char * , void( * )(T * ))
• statement::bind(int, std::unique_ptr<T>)
• context::result(T * , const char * , void( * )(T * ))
• context::result(std::unique_ptr<T>)

Since

SQLite 3.20

type()

int type ( ) const

inlinenoexcept

Default datatype of the value.

Equivalent to sqlite3_value_type

Returns

One of the SQLite datatype constants

subtype()

unsigned subtype ( ) const

inlinenoexcept

Subtype of the value.

Equivalent to sqlite3_value_subtype

Since

SQLite 3.9

numeric_type()

int numeric_type ( ) const

inlinenoexcept

Best numeric datatype of the value.

Equivalent to sqlite3_value_numeric_type

Returns

One of the SQLite datatype constants

nochange()

bool nochange ( ) const

inlinenoexcept

Whether the column is unchanged in an UPDATE against a virtual table.

Equivalent to sqlite3_value_nochange

Since

SQLite 3.22

frombind()

bool frombind ( ) const

inlinenoexcept

Whether if value originated from a bound parameter

Equivalent to sqlite3_value_frombind

Since

SQLite 3.28

in_first()

value * in_first ( ) const

inline

Get first element on the right-hand side of an IN constraint.

Equivalent to sqlite3_vtab_in_first

in_next()

value * in_next ( ) const

inline

Get next element on the right-hand side of an IN constraint.

Equivalent to sqlite3_vtab_in_next