null.h File Reference

Declares classes that implement SQL "null" semantics within C++'s type system. More...

#include "exceptions.h"
#include <iostream>
#include <string>

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Classes
class	mysqlpp::null_type
	The type of the global mysqlpp::null object. More...
struct	mysqlpp::NullIsNull
	Class for objects that define SQL null in terms of MySQL++'s null_type. More...
struct	mysqlpp::NullIsZero
	Class for objects that define SQL null as 0. More...
struct	mysqlpp::NullIsBlank
	Class for objects that define SQL null as a blank C string. More...
class	mysqlpp::Null< Type, Behavior >
	Class for holding data from a SQL column with the NULL attribute. More...

Functions
template<class Type , class Behavior >
std::ostream &	mysqlpp::operator<< (std::ostream &o, const Null< Type, Behavior > &n)
	Inserts null-able data into a C++ stream if it is not actually null. Otherwise, insert something appropriate for null data.

Variables
const std::string	mysqlpp::null_str
	"NULL" string constant
const null_type	mysqlpp::null = null_type()
	Global 'null' instance. Use wherever you need a SQL null. More...

Detailed Description

Declares classes that implement SQL "null" semantics within C++'s type system.

This is required because C++'s own NULL type is not semantically the same as SQL nulls.