KDbVariableExpression Class Reference

#include <KDbExpression.h>

Inheritance diagram for KDbVariableExpression:

Public Member Functions
	KDbVariableExpression ()
	KDbVariableExpression (const KDbVariableExpression &expr)
	KDbVariableExpression (const QString &name)
KDbField *	field () const
QString	name () const
KDbTableSchema *	tableForQueryAsterisk () const
int	tablePositionForField () const
Public Member Functions inherited from KDbExpression
	KDbExpression ()
KDbExpression	clone () const
QDebug	debug (QDebug dbg, KDb::ExpressionCallStack *callStack) const
KDb::ExpressionClass	expressionClass () const
void	getQueryParameters (QList< KDbQuerySchemaParameter > *params)
bool	isBinary () const
bool	isConst () const
bool	isDateTimeType () const
bool	isFPNumericType () const
bool	isFunction () const
bool	isIntegerType () const
bool	isNArg () const
bool	isNull () const
bool	isNumericType () const
bool	isQueryParameter () const
bool	isTextType () const
bool	isUnary () const
bool	isValid () const
bool	isVariable () const
bool	operator!= (const KDbExpression &e) const
bool	operator== (const KDbExpression &e) const
KDbExpression	parent () const
void	setExpressionClass (KDb::ExpressionClass aClass)
void	setToken (KDbToken token)
KDbBinaryExpression	toBinary () const
KDbConstExpression	toConst () const
KDbFunctionExpression	toFunction () const
KDbToken	token () const
KDbNArgExpression	toNArg () const
KDbQueryParameterExpression	toQueryParameter () const
KDbEscapedString	toString (const KDbDriver *driver, KDbQuerySchemaParameterValueListIterator *params=nullptr, KDb::ExpressionCallStack *callStack=nullptr) const
KDbUnaryExpression	toUnary () const
KDbVariableExpression	toVariable () const
KDbField::Type	type () const
bool	validate (KDbParseInfo *parseInfo)

Protected Member Functions
	KDbVariableExpression (const ExplicitlySharedExpressionDataPointer &ptr)
	KDbVariableExpression (KDbExpressionData *data)
Protected Member Functions inherited from KDbExpression
	KDbExpression (const ExplicitlySharedExpressionDataPointer &ptr)
	KDbExpression (KDbExpressionData *data)
	KDbExpression (KDbExpressionData *data, KDb::ExpressionClass aClass, KDbToken token)
void	appendChild (const ExplicitlySharedExpressionDataPointer &child)
void	appendChild (const KDbExpression &child)
bool	checkBeforeInsert (const ExplicitlySharedExpressionDataPointer &child)
QList< ExplicitlySharedExpressionDataPointer >	children () const
int	indexOfChild (const KDbExpression &child, int from=0) const
void	insertChild (int i, const KDbExpression &child)
void	insertEmptyChild (int i)
int	lastIndexOfChild (const KDbExpression &child, int from=-1) const
void	prependChild (const KDbExpression &child)
bool	removeChild (const KDbExpression &child)
void	removeChild (int i)
void	setLeftOrRight (const KDbExpression &right, int index)
KDbExpression	takeChild (int i)

Additional Inherited Members
Static Public Member Functions inherited from KDbExpression
static KDb::ExpressionClass	classForToken (KDbToken token)
Protected Attributes inherited from KDbExpression
ExplicitlySharedExpressionDataPointer	d

Detailed Description

The KDbVariableExpression class represents variables such as fieldname or tablename.fieldname

Definition at line 452 of file KDbExpression.h.

Constructor & Destructor Documentation

KDbVariableExpression() [1/5]

KDbVariableExpression::KDbVariableExpression

(

)

Constructs a null variable expression.

See also

KDbExpression::isNull()

Definition at line 244 of file KDbVariableExpression.cpp.

KDbVariableExpression() [2/5]

KDbVariableExpression::KDbVariableExpression ( const QString & name )

explicit

Constructs variable expression with name name.

Definition at line 250 of file KDbVariableExpression.cpp.

KDbVariableExpression() [3/5]

KDbVariableExpression::KDbVariableExpression

(

const KDbVariableExpression &

expr

)

Constructs a copy of other variable expression expr. Resulting object is not a deep copy but rather a reference to the object expr.

Definition at line 256 of file KDbVariableExpression.cpp.

~KDbVariableExpression()

KDbVariableExpression::~KDbVariableExpression ( )

override

Definition at line 272 of file KDbVariableExpression.cpp.

KDbVariableExpression() [4/5]

KDbVariableExpression::KDbVariableExpression ( KDbExpressionData * data )

explicitprotected

Definition at line 261 of file KDbVariableExpression.cpp.

KDbVariableExpression() [5/5]

KDbVariableExpression::KDbVariableExpression ( const ExplicitlySharedExpressionDataPointer & ptr )

explicitprotected

Definition at line 267 of file KDbVariableExpression.cpp.

Member Function Documentation

field()

KDbField * KDbVariableExpression::field

(

)

const

0 by default. After successful validate() it returns a field, if the variable is of a form "tablename.fieldname" or "fieldname", otherwise (eg. for asterisks) still 0. Only meaningful for column expressions within a query.

Definition at line 281 of file KDbVariableExpression.cpp.

name()

QString KDbVariableExpression::name

(

)

const

Verbatim name as returned by scanner.

Definition at line 276 of file KDbVariableExpression.cpp.

tableForQueryAsterisk()

KDbTableSchema * KDbVariableExpression::tableForQueryAsterisk

(

)

const

nullptr by default. After successful validate() it returns table that is referenced by asterisk, i.e. "*.tablename". It is nullptr if this variable is not an asterisk of that form.

Definition at line 291 of file KDbVariableExpression.cpp.

tablePositionForField()

int KDbVariableExpression::tablePositionForField

(

)

const

-1 by default. After successful validate() it returns a position of a table within query that needs to be bound to the field. This value can be either be -1 if no binding is needed. This value is used in the Parser to call KDbQuerySchema::addField(KDbField* field, int bindToTable); Only meaningful for column expressions within a query.

Definition at line 286 of file KDbVariableExpression.cpp.

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

• KDbExpression.h
• KDbVariableExpression.cpp