SequoiaDB.DBLob Class Reference

Database operation interfaces of large object. More...

Public Member Functions
void	Close ()
	Close the lob.
int	Read (byte[] b)
	Reads up to b.length bytes of data from this lob into an array of bytes.
int	Read (byte[] b, int off, int len)
	Reads up to.
void	Write (byte[] b)
	Writes b.length bytes from the specified byte array to this lob.
void	Write (byte[] b, int off, int len)
	Writes len bytes from the specified byte array to this lob.
void	Seek (long size, int seekType)
	Change the read/write position of the lob. The new position is obtained by adding.
void	Lock (long offset, long length)
	Lock LOB section for writing.
void	LockAndSeek (long offset, long length)
	Lock LOB section for writing and seek to the offset position.
bool	IsClosed ()
	Test whether lob has been closed or not.
ObjectId	GetID ()
	Get the lob's id.
long	GetSize ()
	Get the size of lob.
long	GetCreateTime ()
	get the create time of lob
long	GetModificationTime ()
	get the last modification time of lob
bool	IsEof ()
	Check whether current offset has reached to the max size of current lob.

Public Attributes
const int	SDB_LOB_SEEK_SET = 0
	Change the position from the beginning of lob.
const int	SDB_LOB_SEEK_CUR = 1
	Change the position from the current position of lob.
const int	SDB_LOB_SEEK_END = 2
	Change the position from the end of lob.
const int	SDB_LOB_READ = 0x00000004
	LOB open mode for reading.
const int	SDB_LOB_WRITE = 0x00000008
	LOB open mode for writing.

Detailed Description

Database operation interfaces of large object.

Member Function Documentation

SequoiaDB.DBLob.Close ( )

inline

Close the lob.

Returns

void

Exceptions

SequoiaDB.BaseException
System.Exception

long SequoiaDB.DBLob.GetCreateTime ( )

inline

get the create time of lob

Returns

The lob's create time

Exceptions

SequoiaDB.BaseException
System.Exception

ObjectId SequoiaDB.DBLob.GetID ( )

inline

Get the lob's id.

Returns

the lob's id

long SequoiaDB.DBLob.GetModificationTime ( )

inline

get the last modification time of lob

Returns

The lob's last modification time

Exceptions

SequoiaDB.BaseException
System.Exception

long SequoiaDB.DBLob.GetSize ( )

inline

Get the size of lob.

Returns

the lob's size

bool SequoiaDB.DBLob.IsClosed ( )

inline

Test whether lob has been closed or not.

Returns

true for lob has been closed, false for not

bool SequoiaDB.DBLob.IsEof ( )

inline

Check whether current offset has reached to the max size of current lob.

Returns

Return true if yes while false for not.

void SequoiaDB.DBLob.Lock ( long  offset, long  length  )

inline

Lock LOB section for writing.

Parameters

offset	Lock start position.
length	Lock length, -1 means lock to the end of lob.

Returns

void

Exceptions

SequoiaDB.BaseException
System.Exception

void SequoiaDB.DBLob.LockAndSeek ( long  offset, long  length  )

inline

Lock LOB section for writing and seek to the offset position.

Parameters

offset	Lock start position.
length	Lock length, -1 means lock to the end of lob.

Returns

void

Exceptions

SequoiaDB.BaseException
System.Exception

SequoiaDB.DBLob.Read ( byte[]  b )

inline

Reads up to b.length bytes of data from this lob into an array of bytes.

Parameters

b	the buffer into which the data is read.

Returns

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the file has been reached, or 0 if b.length is Zero.

Exceptions

SequoiaDB.BaseException
System.Exception

SequoiaDB.DBLob.Read ( byte[]  b, int  off, int  len  )

inline

Reads up to.

len bytes of data from this lob into an array of bytes.

Parameters

b	the buffer into which the data is read.
off	the start offset in the destination array b.
len	the maximum number of bytes read.

Returns

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the file has been reached, or 0 if b.length is Zero.

Exceptions

SequoiaDB.BaseException
System.Exception

void SequoiaDB.DBLob.Seek ( long  size, int  seekType  )

inline

Change the read/write position of the lob. The new position is obtained by adding.

size to the position specified by seekType. If seekType is set to SDB_LOB_SEEK_SET, SDB_LOB_SEEK_CUR, or SDB_LOB_SEEK_END, the offset is relative to the start of the lob, the current position of lob, or the end of lob.

Parameters

size	the adding size.
seekType	SDB_LOB_SEEK_SET/SDB_LOB_SEEK_CUR/SDB_LOB_SEEK_END

Returns

void

Exceptions

SequoiaDB.BaseException
System.Exception

SequoiaDB.DBLob.Write ( byte[]  b )

inline

Writes b.length bytes from the specified byte array to this lob.

Parameters

b

The data.

Exceptions

SequoiaDB.BaseException
System.Exception

SequoiaDB.DBLob.Write ( byte[]  b, int  off, int  len  )

inline

Writes len bytes from the specified byte array to this lob.

Parameters

b	The data.
off	The offset of the data buffer.
len	The lenght to write.

Exceptions

SequoiaDB.BaseException
System.Exception

Member Data Documentation

const int SDB_LOB_READ = 0x00000004

LOB open mode for reading.

0x00000004

const int SDB_LOB_SEEK_CUR = 1

Change the position from the current position of lob.

1

const int SDB_LOB_SEEK_END = 2

Change the position from the end of lob.

2

const int SDB_LOB_SEEK_SET = 0

Change the position from the beginning of lob.

0

const int SDB_LOB_WRITE = 0x00000008

LOB open mode for writing.

0x00000008

---

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

• DBLob.cs