KDbExpression Class Reference

#include <KDbExpression.h>

Inheritance diagram for KDbExpression:

Public Member Functions
	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)

Static Public Member Functions
static KDb::ExpressionClass	classForToken (KDbToken token)

Protected Member Functions
	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)

Protected Attributes
ExplicitlySharedExpressionDataPointer	d

Detailed Description

The KDbExpression class represents a base class for all expressions.

Definition at line 51 of file KDbExpression.h.

Constructor & Destructor Documentation

KDbExpression()

KDbExpression::KDbExpression

(

)

Constructs a null expression.

See also

KDbExpression::isNull()

Definition at line 263 of file KDbExpression.cpp.

Member Function Documentation

children()

QList< ExplicitlySharedExpressionDataPointer > KDbExpression::children ( ) const

protected

Returns

the list of children expressions.

Definition at line 370 of file KDbExpression.cpp.

classForToken()

KDb::ExpressionClass KDbExpression::classForToken ( KDbToken  token )

static

Returns

expression class for token token.

Todo:

support more tokens

Definition at line 596 of file KDbExpression.cpp.

clone()

KDbExpression KDbExpression::clone

(

)

const

Creates a deep (not shallow) copy of the KDbExpression.

Definition at line 300 of file KDbExpression.cpp.

expressionClass()

KDb::ExpressionClass KDbExpression::expressionClass

(

)

const

Returns

class identifier of this expression. Default expressionClass is KDb::UnknownExpression.

Definition at line 315 of file KDbExpression.cpp.

getQueryParameters()

void KDbExpression::getQueryParameters

(

QList< KDbQuerySchemaParameter > *

params

)

Collects query parameters (messages and types) recursively and saves them to params. The leaf nodes are objects of QueryParameterExpr class.

Note

params must not be 0.

Definition at line 478 of file KDbExpression.cpp.

insertEmptyChild()

void KDbExpression::insertEmptyChild ( int  i )

protected

Used for inserting placeholders, e.g. in KDbBinaryExpression::KDbBinaryExpression()

Definition at line 398 of file KDbExpression.cpp.

isDateTimeType()

bool KDbExpression::isDateTimeType

(

)

const

Returns

true if type of this object belong to a group of time, date and date/time types.

A covenience method.

See also

type()

Definition at line 360 of file KDbExpression.cpp.

isFPNumericType()

bool KDbExpression::isFPNumericType

(

)

const

Returns

true if type of this object belong to a group of floating-point numeric types.

A covenience method.

See also

type()

Definition at line 355 of file KDbExpression.cpp.

isIntegerType()

bool KDbExpression::isIntegerType

(

)

const

Returns

true if type of this object belong to a group of integer types.

A covenience method.

See also

type()

Definition at line 345 of file KDbExpression.cpp.

isNull()

bool KDbExpression::isNull

(

)

const

Returns

true if this expression is null. Equivalent of expressionClass() == KDb::UnknownExpression.

Note

Returns false for expressions of type KDbField::Null (SQL's NULL).

Definition at line 295 of file KDbExpression.cpp.

isNumericType()

bool KDbExpression::isNumericType

(

)

const

Returns

true if type of this object belong to a group of numeric types.

A covenience method.

See also

type()

Definition at line 350 of file KDbExpression.cpp.

isTextType()

bool KDbExpression::isTextType

(

)

const

Returns

true if type of this object belong to a group of text types.

A covenience method.

See also

type()

Definition at line 340 of file KDbExpression.cpp.

isValid()

bool KDbExpression::isValid

(

)

const

Returns

true if type of this object is not KDbField::InvalidType.

A covenience method.

See also

type()

Definition at line 335 of file KDbExpression.cpp.

parent()

KDbExpression KDbExpression::parent

(

)

const

Returns

the parent expression.

Definition at line 365 of file KDbExpression.cpp.

setExpressionClass()

void KDbExpression::setExpressionClass

(

KDb::ExpressionClass

aClass

)

Sets expression class aClass for this expression.

Definition at line 320 of file KDbExpression.cpp.

setLeftOrRight()

void KDbExpression::setLeftOrRight ( const KDbExpression &  right, int  index  )

protected

Only for KDbBinaryExpression::setLeft() and KDbBinaryExpression::setRight()

Definition at line 574 of file KDbExpression.cpp.

setToken()

void KDbExpression::setToken

(

KDbToken

token

)

Sets token token for this expression.

Definition at line 310 of file KDbExpression.cpp.

token()

KDbToken KDbExpression::token

(

)

const

Returns

the token for this expression. Tokens are characters (e.g. '+', '-') or identifiers (e.g. SQL_NULL) of elements used by the KDbSQL parser. By default token is 0.

Definition at line 305 of file KDbExpression.cpp.

toNArg()

KDbNArgExpression KDbExpression::toNArg

(

)

const

Convenience type casts.

Definition at line 539 of file KDbExpression.cpp.

toString()

KDbEscapedString KDbExpression::toString	(	const KDbDriver *	driver,
		KDbQuerySchemaParameterValueListIterator *	params = nullptr,
		KDb::ExpressionCallStack *	callStack = nullptr
	)		const

Returns

string as a representation of this expression element by running recursive calls. param, if not 0, points to a list item containing value of a query parameter (used in QueryParameterExpr). The result may depend on the optional driver parameter. If driver is 0, representation for portable KDbSQL dialect is returned.

Definition at line 469 of file KDbExpression.cpp.

type()

KDbField::Type KDbExpression::type

(

)

const

Returns

type of this expression, based on effect of its evaluation. Default type is KDbField::InvalidType.

See also

isValid()

Definition at line 330 of file KDbExpression.cpp.

validate()

bool KDbExpression::validate

(

KDbParseInfo *

parseInfo

)

Returns

true if evaluation of this expression succeeded.

Definition at line 325 of file KDbExpression.cpp.

Member Data Documentation

d

ExplicitlySharedExpressionDataPointer KDbExpression::d

protected

Definition at line 200 of file KDbExpression.h.

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

• KDbExpression.h
• KDbExpression.cpp