CoGaDB::RowValueColumn< T > Class Template Reference

Interface for column based access to the early materialized table RowTable. More...

#include <row_value_column.hpp>

Inheritance diagram for CoGaDB::RowValueColumn< T >:

Collaboration diagram for CoGaDB::RowValueColumn< T >:

List of all members.

Public Member Functions
	RowValueColumn (RowTablePtr, string &, const AttributeType &)
virtual	~RowValueColumn ()
bool	isCompressed () const throw ()
	use this method to determine whether the column is materialized or a Lookup Column
bool	update (PositionListPtr tid, const boost::any &new_value)
	updates the values specified by the position list with a value new_Value
bool	remove (PositionListPtr tid)
	deletes the values defined in the position list
bool	insert (const boost::any &new_Value)
	Not implemented -
bool	update (TID tid, const boost::any &new_Value)
	Not implemented -
bool	remove (TID tid)
	Not implemented -
virtual const boost::any	get (TID tid)
	generic function for fetching a value form a column (slow)
virtual void	print () const throw ()
	prints the content of a column
size_t	size () const throw ()
	Not implemented -
unsigned int	getSizeinBytes () const throw ()
	Not implemented -
const ColumnPtr	copy () const
	Not implemented -
bool	store (const string &path)
	Not implemented -
bool	load (const string &path)
	Not implemented -
bool	isMaterialized () const throw ()
	Always false.
const type_info &	type () const throw ()
	returns type information of internal values
T &	operator[] (const int index)
	Index-based access. Use for accessing values in column.
ColumnPtr	toColumn ()
template<>
int &	operator[] (const int index)
	defines operator[] for this class, which enables the user to thread all typed columns as arrays.
template<>
string &	operator[] (const int index)
	defines operator[] for this class, which enables the user to thread all typed columns as arrays.
template<>
bool &	operator[] (const int index)
	defines operator[] for this class, which enables the user to thread all typed columns as arrays.
template<>
float &	operator[] (const int index)
	defines operator[] for this class, which enables the user to thread all typed columns as arrays.
Private Member Functions
char *	getValue (const int index, unsigned short &stringLength) const
	Gets a value at a specific row (index) as bytes (char*)
Private Attributes
RowTablePtr	_row_table_ptr
	Pointer to RowTable (early materialized table) to which this Column depents.
unsigned int	_column_index
	Column Index of the RowTable.
AttributeType	_type
	Type of this column.

---

Detailed Description

template<typename T>
class CoGaDB::RowValueColumn< T >

Interface for column based access to the early materialized table RowTable.

---

Constructor & Destructor Documentation

template<typename T >

CoGaDB::RowValueColumn< T >::RowValueColumn	(	RowTablePtr	row_table_ptr,
		string &	name,
		const AttributeType &	type
	)

template<typename T >

CoGaDB::RowValueColumn< T >::~RowValueColumn

(

)

[virtual]

---

Member Function Documentation

template<typename T >

const ColumnPtr CoGaDB::RowValueColumn< T >::copy

(

)

const [virtual]

• Not implemented -

Implements CoGaDB::ColumnBaseTyped< T >.

template<typename T >

const boost::any CoGaDB::RowValueColumn< T >::get

(

TID

tid

)

[virtual]

generic function for fetching a value form a column (slow)

check whether the object is valid (e.g., when a tid is not valid, then the returned object is invalid as well)

Returns:

object of type boost::any containing the value on position tid

Implements CoGaDB::ColumnBaseTyped< T >.

References CoGaDB::BOOLEAN, CoGaDB::FLOAT, CoGaDB::INT, and CoGaDB::VARCHAR.

template<typename T >

unsigned int CoGaDB::RowValueColumn< T >::getSizeinBytes

(

)

const throw () [virtual]

• Not implemented -

Implements CoGaDB::ColumnBaseTyped< T >.

template<typename T >

char * CoGaDB::RowValueColumn< T >::getValue	(	const int	index,
		unsigned short &	stringLength
	)		const [private]

Gets a value at a specific row (index) as bytes (char*)

template<typename T >

bool CoGaDB::RowValueColumn< T >::insert

(

const boost::any &

new_Value

)

[virtual]

• Not implemented -

Implements CoGaDB::ColumnBaseTyped< T >.

template<typename T >

bool CoGaDB::RowValueColumn< T >::isCompressed

(

)

const throw () [virtual]

use this method to determine whether the column is materialized or a Lookup Column

Returns:

true in case the column is storing the compressed values and false otherwise.

Implements CoGaDB::ColumnBaseTyped< T >.

template<typename T >

bool CoGaDB::RowValueColumn< T >::isMaterialized

(

)

const throw () [virtual]

Always false.

Implements CoGaDB::ColumnBaseTyped< T >.

template<typename T >

bool CoGaDB::RowValueColumn< T >::load

(

const string &

path

)

[virtual]

• Not implemented -

Implements CoGaDB::ColumnBaseTyped< T >.

template<typename T >

T& CoGaDB::RowValueColumn< T >::operator[]

(

const int

index

)

[virtual]

Index-based access. Use for accessing values in column.

Implements CoGaDB::ColumnBaseTyped< T >.

template<>

int & CoGaDB::RowValueColumn< int >::operator[]

(

const int

index

)

[inline, virtual]

defines operator[] for this class, which enables the user to thread all typed columns as arrays.

Note that this method is pure virtual, so it has to be defined in a derived class.

Returns:

a reference to the value at position index

Implements CoGaDB::ColumnBaseTyped< T >.

template<>

string & CoGaDB::RowValueColumn< string >::operator[]

(

const int

index

)

[inline, virtual]

defines operator[] for this class, which enables the user to thread all typed columns as arrays.

Note that this method is pure virtual, so it has to be defined in a derived class.

Returns:

a reference to the value at position index

Implements CoGaDB::ColumnBaseTyped< T >.

template<>

bool & CoGaDB::RowValueColumn< bool >::operator[]

(

const int

index

)

[inline, virtual]

defines operator[] for this class, which enables the user to thread all typed columns as arrays.

Note that this method is pure virtual, so it has to be defined in a derived class.

Returns:

a reference to the value at position index

Implements CoGaDB::ColumnBaseTyped< T >.

template<>

float & CoGaDB::RowValueColumn< float >::operator[]

(

const int

index

)

[inline, virtual]

defines operator[] for this class, which enables the user to thread all typed columns as arrays.

Note that this method is pure virtual, so it has to be defined in a derived class.

Returns:

a reference to the value at position index

Implements CoGaDB::ColumnBaseTyped< T >.

template<typename T >

void CoGaDB::RowValueColumn< T >::print

(

)

const throw () [virtual]

prints the content of a column

Implements CoGaDB::ColumnBaseTyped< T >.

References CoGaDB::BOOLEAN, CoGaDB::FLOAT, CoGaDB::INT, and CoGaDB::VARCHAR.

template<typename T >

bool CoGaDB::RowValueColumn< T >::remove

(

PositionListPtr

tid

)

[virtual]

deletes the values defined in the position list

assumes tid list is sorted ascending

Returns:

true for sucess and false in case an error occured

Implements CoGaDB::ColumnBaseTyped< T >.

template<typename T >

bool CoGaDB::RowValueColumn< T >::remove

(

TID

tid

)

[virtual]

• Not implemented -

Implements CoGaDB::ColumnBaseTyped< T >.

template<typename T >

size_t CoGaDB::RowValueColumn< T >::size

(

)

const throw () [virtual]

• Not implemented -

Implements CoGaDB::ColumnBaseTyped< T >.

template<typename T >

bool CoGaDB::RowValueColumn< T >::store

(

const string &

path

)

[virtual]

• Not implemented -

Implements CoGaDB::ColumnBaseTyped< T >.

template<typename T >

ColumnPtr CoGaDB::RowValueColumn< T >::toColumn

(

)

References CoGaDB::createColumn(), and CoGaDB::util::getName().

Here is the call graph for this function:

template<typename T >

const std::type_info & CoGaDB::RowValueColumn< T >::type

(

)

const throw () [virtual]

returns type information of internal values

Reimplemented from CoGaDB::ColumnBaseTyped< T >.

template<typename T >

bool CoGaDB::RowValueColumn< T >::update	(	PositionListPtr	tids,
		const boost::any &	new_value
	)		[virtual]

updates the values specified by the position list with a value new_Value

Returns:

true for sucess and false in case an error occured

Implements CoGaDB::ColumnBaseTyped< T >.

template<typename T >

bool CoGaDB::RowValueColumn< T >::update	(	TID	tid,
		const boost::any &	new_Value
	)		[virtual]

• Not implemented -

Implements CoGaDB::ColumnBaseTyped< T >.

---

Member Data Documentation

template<typename T >

unsigned int CoGaDB::RowValueColumn< T >::_column_index [private]

Column Index of the RowTable.

template<typename T >

RowTablePtr CoGaDB::RowValueColumn< T >::_row_table_ptr [private]

Pointer to RowTable (early materialized table) to which this Column depents.

template<typename T >

AttributeType CoGaDB::RowValueColumn< T >::_type [private]

Type of this column.

---

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

• /home/sebastian/gpudbms/trunk/cogadb/include/core/row_value_column.hpp