database_interface::DBFieldData< T > Class Template Reference

A DBFieldBase that also contains data and perform implicit conversion to and from string. More...

#include <db_field.h>

Inheritance diagram for database_interface::DBFieldData< T >:

Public Member Functions
T &	data ()
const T &	data () const
	DBFieldData (Type type, DBClass *owner, std::string name, std::string table_name, bool write_permission)
virtual bool	fromBinary (const char *, size_t)
	Sets the value of this field from a binary chunk of data.
virtual bool	fromString (const std::string &str)
	Sets the value of this field from a text string.
T &	get ()
const T &	get () const
virtual bool	toBinary (const char *&, size_t &) const
	Gets a pointer to the value of this field as a binary chunk of data.
virtual bool	toString (std::string &str) const
	Gets the value of this field as a text string.
Protected Member Functions
void	copy (const DBFieldData< T > *other)
	DBFieldData (DBClass owner, const DBFieldData other)
	Copy constructor also copies the data itself.
Protected Attributes
T	data_

Detailed Description

template<class T>
class database_interface::DBFieldData< T >

A DBFieldBase that also contains data and perform implicit conversion to and from string.

Default conversion to and from string is through the stream operators >> and <<. Any data type that defines those operators can be used inside this class. Works well for most basic data types (int, double, etc).

Default behavior for conversion to / from binary is to always fail. This will be overidden only in the specialized DBField< std::vector<char> >

Definition at line 277 of file db_field.h.

Constructor & Destructor Documentation

template<class T>

database_interface::DBFieldData< T >::DBFieldData	(	DBClass *	owner,
		const DBFieldData< T > *	other
	)			`[inline, protected]`

Copy constructor also copies the data itself.

Data is copied through a string or a binary chunk. This implies an additional copy (extra work and memory) but adds no constraints on the type T, which we already know can be converted either to string or to binary.

Definition at line 287 of file db_field.h.

template<class T>

database_interface::DBFieldData< T >::DBFieldData	(	Type	type,
		DBClass *	owner,
		std::string	name,
		std::string	table_name,
		bool	write_permission
	)			`[inline]`