QDjangoWhere Class Reference

The QDjangoWhere class expresses an SQL constraint. More...

#include <QDjangoWhere.h>

Public Types
enum	Operation {   None, Equals, NotEquals, GreaterThan,   LessThan, GreaterOrEquals, LessOrEquals, StartsWith,   EndsWith, Contains, IsIn, IsNull }

Public Member Functions
	QDjangoWhere ()
	QDjangoWhere (const QDjangoWhere &other)
	QDjangoWhere (const QString &key, QDjangoWhere::Operation operation, QVariant value)
	~QDjangoWhere ()
QDjangoWhere &	operator= (const QDjangoWhere &other)
QDjangoWhere	operator! () const
QDjangoWhere	operator&& (const QDjangoWhere &other) const
QDjangoWhere	operator|| (const QDjangoWhere &other) const
void	bindValues (QDjangoQuery &query) const
bool	isAll () const
bool	isNone () const
QString	sql (const QSqlDatabase &db) const

Friends
class	QDjangoCompiler

Detailed Description

The QDjangoWhere class expresses an SQL constraint.

The QDjangoWhere class is used to build SQL WHERE statements. In its simplest form a QDjangoWhere expresses a constraint on a column value.

QDjangoWhere instances can be negated using the "!" unary operator or combined using the "&&" and "||" boolean operators.

Member Enumeration Documentation

enum QDjangoWhere::Operation

A comparison operation on a database column value.

Enumerator:

None	No comparison, always returns true.
Equals	Returns true if the column value is equal to the given value.
NotEquals	Returns true if the column value is not equal to the given value.
GreaterThan	Returns true if the column value is greater than the given value.
LessThan	Returns true if the column value is less than the given value.
GreaterOrEquals	Returns true if the column value is greater or equal to the given value.
LessOrEquals	Returns true if the column value is less or equal to the given value.
StartsWith	Returns true if the column value starts with the given value (strings only).
EndsWith	Returns true if the column value ends with the given value (strings only).
Contains	Returns true if the column value contains the given value (strings only).
IsIn	Returns true if the column value is one of the given values.
IsNull	Returns true if the column value is null.

Constructor & Destructor Documentation

QDjangoWhere::QDjangoWhere

(

)

Constructs an empty QDjangoWhere, which expresses no constraint.

QDjangoWhere::QDjangoWhere

(

const QDjangoWhere &

other

)

Constructs a copy of other.

QDjangoWhere::QDjangoWhere	(	const QString &	key,
		QDjangoWhere::Operation	operation,
		QVariant	value
	)

Constructs a QDjangoWhere expressing a constraint on a database column.

Parameters

key
operation
value

QDjangoWhere::~QDjangoWhere

(

)

Destroys a QDjangoWhere.

Member Function Documentation

void QDjangoWhere::bindValues

(

QDjangoQuery &

query

)

const

Bind the values associated with this QDjangoWhere to the given query.

Parameters

query

bool QDjangoWhere::isAll

(

)

const

Returns true if the current QDjangoWhere does not express any constraint.

bool QDjangoWhere::isNone

(

)

const

Returns true if the current QDjangoWhere expressed an impossible constraint.

QDjangoWhere QDjangoWhere::operator!

(

)

const

Negates the current QDjangoWhere.

QDjangoWhere QDjangoWhere::operator&&

(

const QDjangoWhere &

other

)

const

Combines the current QDjangoWhere with the other QDjangoWhere using a logical AND.

Parameters

other

QDjangoWhere & QDjangoWhere::operator=

(

const QDjangoWhere &

other

)

Assigns other to this QDjangoWhere.

QDjangoWhere QDjangoWhere::operator||

(

const QDjangoWhere &

other

)

const

Combines the current QDjangoWhere with the other QDjangoWhere using a logical OR.

Parameters

other

QString QDjangoWhere::sql

(

const QSqlDatabase &

db

)

const

Returns the SQL code corresponding for the current QDjangoWhere.

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

• QDjangoWhere.h
• QDjangoWhere.cpp