RWDBAssignment Class Reference

Represents the result of applying the RWDBColumn::assign() method to an RWDBExpr. More...

#include <rw/db/expr.h>

Inheritance diagram for RWDBAssignment:

Public Member Functions
	RWDBAssignment (void)
	RWDBAssignment (const RWDBColumn &c, const RWDBExpr &e)
	RWDBAssignment (const RWDBColumn &c, const RWDBValue &v)
RWDBColumn	column () const
RWDBExpr	expression () const
RWDBValue	value () const
Public Member Functions inherited from RWDBExpr
	RWDBExpr ()
	RWDBExpr (const RWDBExpr &expr)
	RWDBExpr (char value)
	RWDBExpr (unsigned char value)
	RWDBExpr (short value)
	RWDBExpr (unsigned short value)
	RWDBExpr (int value)
	RWDBExpr (unsigned int value)
	RWDBExpr (long int value)
	RWDBExpr (unsigned long int value)
	RWDBExpr (long long value)
	RWDBExpr (unsigned long long value)
	RWDBExpr (float value)
	RWDBExpr (double value)
	RWDBExpr (long double value)
	RWDBExpr (const char *value)
	RWDBExpr (const wchar_t *value)
	RWDBExpr (const RWCString &value)
	RWDBExpr (const RWDecimalPortable &value)
	RWDBExpr (const RWDateTime &value)
	RWDBExpr (const RWDBDateTime &value)
	RWDBExpr (const RWDBDuration &value)
	RWDBExpr (const RWDate &value)
	RWDBExpr (const RWTime &value)
	RWDBExpr (const RWDBBlob &value)
	RWDBExpr (const RWBasicUString &value)
	RWDBExpr (const RWDBMBString &value)
	RWDBExpr (const RWWString &value)
	RWDBExpr (const RWDBValue &value, bool usePhraseBook=true)
	RWDBExpr (const RWDBColumn &column)
	RWDBExpr (const RWDBSelectorBase &subSelect)
	RWDBExpr (RWDBValueManip manip)
	RWDBExpr (const RWCollection &collection)
	RWDBExpr (const RWDBTable &)
	RWDBExpr (const RWDBColumn &left, const RWDBExpr &right)
	RWDBExpr (const RWDBColumn &left, const RWDBValue &right)
RWCString	asString (const RWDBPhraseBook &phraseBook, AsStringControlFlag control=normal) const
RWDBCriterion	between (const RWDBExpr &expression1, const RWDBExpr &expression2) const
RWDBCriterion	in (const RWDBExpr &expression1) const
RWDBCriterion	isNull (void) const
bool	isValid (void) const
RWDBCriterion	leftOuterJoin (const RWDBExpr &expression) const
RWDBCriterion	like (const RWDBExpr &expression1) const
RWDBCriterion	matchUnique (const RWDBExpr &expression1) const
RWDBExpr &	operator= (const RWDBExpr &expr)
RWDBCriterion	rightOuterJoin (const RWDBExpr &expression) const
Public Member Functions inherited from RWCollectable
virtual	~RWCollectable ()
virtual RWspace	binaryStoreSize () const
virtual int	compareTo (const RWCollectable *) const
virtual RWCollectable *	copy () const
virtual unsigned	hash () const
virtual RWClassID	isA () const
virtual bool	isEqual (const RWCollectable *t) const
virtual RWCollectable *	newSpecies () const
RWspace	recursiveStoreSize () const
virtual void	restoreGuts (RWFile &)
virtual void	restoreGuts (RWvistream &)
virtual void	saveGuts (RWFile &) const
virtual void	saveGuts (RWvostream &) const
RWStringID	stringID () const

Additional Inherited Members
Public Types inherited from RWDBExpr
enum	AsStringControlFlag { normal, suppressTagsOnColumns, noPlaceHolder, placeHolderNotRecommended }
Static Public Member Functions inherited from RWCollectable
static RWClassID	classID (const RWStringID &name)
static RWClassID	classIsA ()
static bool	isAtom (RWClassID id)
static RWspace	nilStoreSize ()
Related Functions inherited from RWDBExpr
RWDBCriterion	operator! (const RWDBCriterion &)
RWDBCriterion	operator!= (const RWDBExpr &, const RWDBExpr &)
RWDBExpr	operator% (const RWDBExpr &, const RWDBExpr &)
RWDBCriterion	operator&& (const RWDBCriterion &, const RWDBCriterion &)
RWDBExpr	operator* (const RWDBExpr &, const RWDBExpr &)
RWDBExpr	operator+ (const RWDBExpr &, const RWDBExpr &)
RWDBExpr	operator+ (const RWDBExpr &)
RWDBExpr	operator- (const RWDBExpr &, const RWDBExpr &)
RWDBExpr	operator- (const RWDBExpr &)
RWDBExpr	operator/ (const RWDBExpr &, const RWDBExpr &)
RWDBCriterion	operator< (const RWDBExpr &, const RWDBExpr &)
RWDBCriterion	operator<= (const RWDBExpr &, const RWDBExpr &)
RWDBCriterion	operator== (const RWDBExpr &, const RWDBExpr &)
RWDBCriterion	operator> (const RWDBExpr &, const RWDBExpr &)
RWDBCriterion	operator>= (const RWDBExpr &, const RWDBExpr &)
RWDBCriterion	operator|| (const RWDBCriterion &, const RWDBCriterion &)
RWDBExpr	rwdbAvg (const RWDBExpr &expr)
RWDBExpr	rwdbCast (const RWDBExpr &expr, const RWDBValue &type)
RWDBExpr	rwdbCast (const RWDBExpr &expr, const RWDBValue &typeName, const RWDBExpr &formatString)
RWDBExpr	rwdbCast (const RWDBExpr &expr, const RWDBValue &typeName, const RWDBExpr &formatString, const RWDBExpr &secondaryFormat)
RWDBExpr	rwdbCharLength (const RWDBExpr &expr)
RWDBExpr	rwdbCount (const RWDBExpr &expr)
RWDBExpr	rwdbCount ()
RWDBExpr	rwdbCountDistinct (const RWDBExpr &expr)
RWDBExpr	rwdbCurrentUser ()
RWDBCriterion	rwdbExists (const RWDBSelectorBase &select)
RWDBExpr	rwdbLower (const RWDBExpr &expr)
RWDBExpr	rwdbMax (const RWDBExpr &expr)
RWDBExpr	rwdbMin (const RWDBExpr &expr)
RWDBExpr	rwdbName (const RWCString &name, const RWDBExpr &expr)
RWDBExpr	rwdbPosition (const RWDBExpr &expr1, const RWDBExpr &expr2)
RWDBExpr	rwdbSessionUser ()
RWDBExpr	rwdbSubString (const RWDBExpr &expr1, const RWDBExpr &expr2)
RWDBExpr	rwdbSubString (const RWDBExpr &expr1, const RWDBExpr &expr2, const RWDBExpr &expr3)
RWDBExpr	rwdbSum (const RWDBExpr &expr)
RWDBExpr	rwdbSystemDateTime ()
RWDBExpr	rwdbSystemUser ()
RWDBExpr	rwdbTrimBoth (const RWDBExpr &expr1, const RWDBExpr &expr2)
RWDBExpr	rwdbTrimLeading (const RWDBExpr &expr1, const RWDBExpr &expr2)
RWDBExpr	rwdbTrimTrailing (const RWDBExpr &expr1, const RWDBExpr &expr2)
RWDBExpr	rwdbUpper (const RWDBExpr &expr)

Detailed Description

RWDBAssignment is the result of applying the RWDBColumn::assign() method to an RWDBExpr. The result is an encapsulation of the SQL SET column = expression phrase, where column refers to the RWDBColumn instance whose assign() method produced the RWDBAssignment, and expression refers to its parameter. RWDBAssignment is used only to build instances of RWDBUpdater.

Synopsis

#include <rw/db/expr.h>

See also

RWDBAssignment is a special case of RWDBExpr. See RWDBExpr for details.

RWDBAssignment instances are produced only by the assign() method of RWDBColumn.

Example

This example adds the phrase SET name = 'Joe' to an RWDBUpdater for the Names table. To do this, an RWDBAssignment instance is created anonymously:

RWDBTable Names = myDbase.table("Names");
RWDBUpdater update = Names.updater();
update << Names["name"].assign("Joe");

Constructor & Destructor Documentation

RWDBAssignment::RWDBAssignment

(

void

)

Constructs a default RWDBAssignment. Provided for convenience only.

RWDBAssignment::RWDBAssignment	(	const RWDBColumn &	c,
		const RWDBExpr &	e
	)

Constructs an RWDBAssignment from an RWDBColumn and an RWDBExpr. Self then emulates the SQL construct SET c = e.

RWDBAssignment::RWDBAssignment	(	const RWDBColumn &	c,
		const RWDBValue &	v
	)

Constructs an RWDBAssignment from an RWDBColumn and an RWDBValue. Self then emulates the SQL construct SET c = v.

Member Function Documentation

RWDBColumn RWDBAssignment::column

(

)

const

Returns the RWDBColumn associated with self.

RWDBExpr RWDBAssignment::expression

(

)

const

Returns the RWDBExpr associated with self.

RWDBValue RWDBAssignment::value

(

)

const

Returns the RWDBValue associated with self.