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KDbVariableExpression Class Reference

#include <KDbExpression.h>

Inheritance diagram for KDbVariableExpression:

Public Member Functions

 KDbVariableExpression ()
 KDbVariableExpression (const KDbVariableExpression &expr)
 KDbVariableExpression (const QString &name)
KDbFieldfield () const
QString name () const
KDbTableSchematableForQueryAsterisk () 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< ExplicitlySharedExpressionDataPointerchildren () 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() [1/3]

KDbVariableExpression::KDbVariableExpression ( )

Constructs a null variable expression.

See also

Definition at line 244 of file KDbVariableExpression.cpp.

◆ KDbVariableExpression() [2/3]

KDbVariableExpression::KDbVariableExpression ( const QString name)

Constructs variable expression with name name.

Definition at line 250 of file KDbVariableExpression.cpp.

◆ KDbVariableExpression() [3/3]

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.

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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