iron_query::Condition Class Reference

A boolean-valued SQL predicate, e.g. the result of a comparison, LIKE/IN/BETWEEN/IS [NOT] NULL, EXISTS, or a logical combination of these. Kept distinct from Expr so that predicate-only positions (WHERE, HAVING, ON, WHEN) cannot silently accept a non-boolean expression, e.g. Where(age) or Where(age + 1). More...

#include <condition.hpp>

Public Member Functions
Condition	operator&& (const Condition &other) const
	this AND other.
Condition	operator|| (const Condition &other) const
	this OR other.
Condition	operator! () const
	NOT this.
std::string	Extract (OperatorPrecedence precedence) const
	Renders the condition as SQL text, parenthesizing it if its top-level operator does not bind at least as tightly as precedence.
std::string	ToString () const
	Renders the condition as a standalone, unparenthesized SQL fragment.
	operator Expr () &&
	Converts this predicate into a value expression, e.g. for embedding it where a boolean-valued Expr is expected. Only available on rvalues.

Static Public Member Functions
static Condition	FromRaw (std::string s)
	Wraps a trusted, developer-written SQL predicate verbatim. Never pass untrusted/dynamic data here.

Friends
class	Expr
Condition	operator< (const Expr &a, const Expr &b)
	a < b.
Condition	operator<= (const Expr &a, const Expr &b)
	a <= b.
Condition	operator> (const Expr &a, const Expr &b)
	a > b.
Condition	operator>= (const Expr &a, const Expr &b)
	a >= b.
Condition	operator== (const Expr &a, const Expr &b)
	a = b.
Condition	operator!= (const Expr &a, const Expr &b)
	a != b.

Detailed Description

A boolean-valued SQL predicate, e.g. the result of a comparison, LIKE/IN/BETWEEN/IS [NOT] NULL, EXISTS, or a logical combination of these. Kept distinct from Expr so that predicate-only positions (WHERE, HAVING, ON, WHEN) cannot silently accept a non-boolean expression, e.g. Where(age) or Where(age + 1).

A boolean-valued column or raw expression can be turned into a Condition explicitly via Expr::IsTrue / Expr::IsFalse / Expr::IsNotNull, or via Condition::FromRaw for a trusted raw fragment.

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

• include/iron_query/condition.hpp