dbBlob Class Reference

#include <blob.h>

Inheritance diagram for dbBlob:

List of all members.

Public Member Functions
void	create (dbDatabase &dbase, size_t size=dbDefaultFirstBlobSegmentSize)
size_t	getSize (dbDatabase &db)
dbBlobReadIterator	getReadIterator (dbDatabase &db)
dbBlobWriteIterator	getWriteIterator (dbDatabase &db, size_t maxExtent=dbDefaultBlobExtent)
dbBlob &	operator= (dbAnyReference const &ref)
void	free (dbDatabase &db)
oid_t	getOid () const
bool	isNull () const
dbFieldDescriptor *	dbDescribeComponents (dbFieldDescriptor *fd)
Protected Attributes
oid_t	oid
Friends
bool	isNull (dbAnyReference const &ref)

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Detailed Description

BLOB class. BLOB in GigaBASE is separate objects accessed by reference. So when record contains BLOB object, it contains reference to the object. As a result, the same BLOB can be referenced by multiple records, but if record is deleted, BLOB is not deleted. You should explicitely invoke dbBlob::free method

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Member Function Documentation

void dbBlob::create (  dbDatabase &  dbase, size_t  size = dbDefaultFirstBlobSegmentSize )

Create BLOB object Parameters: dbase  reference to the database size  size of the first BLOB segments. Other segments will be created on demand and size of new segment will be taken as doubled size of the last segment.

void dbBlob::free (  dbDatabase &  db  )

Free BLOB object. Programmer should explicitely invoke this method to deallcoate BLOB object. BLOB object will not be deallocated when record containing reference to it is deleted. Parameters: db  reference to the database

oid_t dbAnyReference::getOid (   )  const [inline, inherited]

Get object idetifier Returns: object identifier of referenced object

dbBlobReadIterator dbBlob::getReadIterator (  dbDatabase &  db  )

Get read iterator to access BLOB Parameters: db  reference to the database Returns: read iterator

size_t dbBlob::getSize (  dbDatabase &  db  )

Get size of the BLOB Parameters: db  reference to the database Returns: number of byte sin all BLOB segments

dbBlobWriteIterator dbBlob::getWriteIterator (  dbDatabase &  db, size_t  maxExtent = dbDefaultBlobExtent )

Get write iterator to access BLOB Parameters: db  reference to the database maxExtent  size of new segment when BLOB is extended. When BLOB has to be extended, size of last segment is doubled. If it is greater than maxExtent, then maxExtent will be used as size of new segment, otherwise doubled size of last segment will be used as size of new segment. Returns: write iterator

bool dbAnyReference::isNull (   )  const [inline, inherited]

Check whether reference is null

dbBlob& dbBlob::operator= (  dbAnyReference const &  ref  )  [inline]

Assignment operator for BLOB. This operator change reference to the BLOB but has no influence on BLOB object itself. Parameters: ref  assigned BLOB reference Returns: assigned reference Reimplemented from dbAnyReference.

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Friends And Related Function Documentation

bool isNull (  dbAnyReference const &  ref  )  [friend, inherited]

Check whether reference is null

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

• blob.h

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