KDbVariableExpression
#include <KDbExpression.h>
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() [1/3]
| KDbVariableExpression::KDbVariableExpression | ( | ) |
Constructs a null variable expression.
- See also
- KDbExpression::isNull()
Definition at line 244 of file KDbVariableExpression.cpp.
◆ KDbVariableExpression() [2/3]
|
explicit |
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.
The documentation for this class was generated from the following files:
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