Represents a MySQL decimal number, type J_DECIMAL. More...

#include <json_dom.h>

Inheritance diagram for Json_decimal:

Public Member Functions
	Json_decimal (const my_decimal &value)

int	binary_size () const
	Get the number of bytes needed to store this decimal in a Json_opaque. More...

bool	get_binary (char *dest) const
	Get the binary representation of the wrapped my_decimal, so that this value can be stored inside of a Json_opaque. More...

enum_json_type	json_type () const override

const my_decimal *	value () const
	Get a pointer to the MySQL decimal held by this object. More...

Json_dom_ptr	clone () const override
	Make a deep clone. More...

Public Member Functions inherited from Json_number
bool	is_number () const final

Public Member Functions inherited from Json_scalar
uint32	depth () const final
	Compute the depth of a document. More...

bool	is_scalar () const final

Public Member Functions inherited from Json_dom
virtual	~Json_dom ()=default

void *	operator new (size_t size, const std::nothrow_t &) noexcept
	Allocate space on the heap for a Json_dom object. More...

void	operator delete (void *ptr) noexcept
	Deallocate the space used by a Json_dom object. More...

void	operator delete (void *ptr, const std::nothrow_t &) noexcept
	Nothrow delete. More...

Json_container *	parent () const
	Get the parent dom to which this dom is attached. More...

Json_path	get_location () const
	Get the path location of this dom, measured from the outermost document it nests inside. More...

bool	seek (const Json_seekable_path &path, size_t legs, Json_dom_vector *hits, bool auto_wrap, bool only_need_one)
	Finds all of the json sub-documents which match the path expression. More...

Static Public Member Functions
static bool	convert_from_binary (const char bin, size_t len, my_decimal dec)
	Convert a binary value produced by get_binary() back to a my_decimal. More...

static const char *	get_encoded_binary (const char *bin)
	Returns stored DECIMAL binary. More...

static size_t	get_encoded_binary_len (size_t length)
	Returns length of stored DECIMAL binary. More...

Static Public Member Functions inherited from Json_dom
static Json_dom_ptr	parse (const char *text, size_t length, const JsonParseErrorHandler &error_handler, const JsonErrorHandler &depth_handler)
	Parse Json text to DOM (using rapidjson). More...

static Json_dom_ptr	parse (const json_binary::Value &v)
	Construct a DOM object based on a binary JSON value. More...

Static Public Attributes
static const int	MAX_BINARY_SIZE = DECIMAL_MAX_FIELD_SIZE + 2

Private Attributes
my_decimal	m_dec
	holds the decimal number More...

Detailed Description

Represents a MySQL decimal number, type J_DECIMAL.

Constructor & Destructor Documentation

◆ Json_decimal()

Json_decimal::Json_decimal ( const my_decimal & value )

explicit

Member Function Documentation

◆ binary_size()

int Json_decimal::binary_size ( ) const

Get the number of bytes needed to store this decimal in a Json_opaque.

Returns: the number of bytes.

◆ clone()

Json_dom_ptr Json_decimal::clone ( ) const

inlineoverridevirtual

Make a deep clone.

The ownership of the returned object is henceforth with the caller.

Returns: a cloned Json_dom object.

Implements Json_dom.

◆ convert_from_binary()

bool Json_decimal::convert_from_binary	(	const char *	bin,
		size_t	len,
		my_decimal *	dec
	)

static

Convert a binary value produced by get_binary() back to a my_decimal.

This and two next functions help storage engine to deal with decimal value in a serialized JSON document. This function converts serialized value to my_decimal. The later two functions extract the decimal value from serialized JSON, so SE can index it in multi-valued index.

Parameters

[in]	bin	decimal value in binary format
[in]	len	length of the binary value
[out]	dec	my_decimal object to store the value to

Returns: false on success, true on failure

◆ get_binary()

bool Json_decimal::get_binary ( char * dest ) const

Get the binary representation of the wrapped my_decimal, so that this value can be stored inside of a Json_opaque.

Parameters

dest	the destination buffer to which the binary representation is written

Returns: false on success, true on error

◆ get_encoded_binary()

static const char * Json_decimal::get_encoded_binary ( const char * bin )

inlinestatic

Returns stored DECIMAL binary.

Parameters

bin	serialized Json_decimal object

Returns: pointer to the binary decimal value

See also: convert_from_binary

◆ get_encoded_binary_len()

static size_t Json_decimal::get_encoded_binary_len ( size_t length )

inlinestatic

Returns length of stored DECIMAL binary.

Parameters

length length of serialized Json_decimal object

Returns: length of the binary decimal value

See also: convert_from_binary

◆ json_type()

enum_json_type Json_decimal::json_type ( ) const

inlineoverridevirtual

Returns: the type corresponding to the actual Json_dom subclass

Implements Json_dom.

◆ value()

const my_decimal * Json_decimal::value ( ) const

inline

Get a pointer to the MySQL decimal held by this object.

Ownership is not transferred.

Returns: the decimal

Member Data Documentation

◆ m_dec

my_decimal Json_decimal::m_dec

private

holds the decimal number

◆ MAX_BINARY_SIZE

const int Json_decimal::MAX_BINARY_SIZE = DECIMAL_MAX_FIELD_SIZE + 2

static

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

sql-common/json_dom.h
sql-common/json_dom.cc

Public Member Functions

Static Public Member Functions

Static Public Attributes

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ Json_decimal()

Member Function Documentation

◆ binary_size()

◆ clone()

◆ convert_from_binary()

◆ get_binary()

◆ get_encoded_binary()

◆ get_encoded_binary_len()

◆ json_type()

◆ value()

Member Data Documentation

◆ m_dec

◆ MAX_BINARY_SIZE