Package org.h2.store

Class LobStorageFrontend

java.lang.Object

org.h2.store.LobStorageFrontend

All Implemented Interfaces:

LobStorageInterface

public class LobStorageFrontend
extends Object
implements LobStorageInterface

This factory creates in-memory objects and temporary files. It is used on the client side.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	TABLE_ID_SESSION_VARIABLE	The table id for session variables (LOBs not assigned to a table).
static final int	TABLE_RESULT	The table id for result sets.
static final int	TABLE_TEMP	The table id for temporary objects (not assigned to any object).

Constructor Summary

Constructors

Constructor	Description
LobStorageFrontend(SessionRemote handler)

Method Summary

Modifier and Type	Method	Description
ValueLob	copyLob(ValueLob old, int tableId)	Copy a lob.
ValueBlob	createBlob(InputStream in, long maxLength)	Create a BLOB object.
ValueClob	createClob(Reader reader, long maxLength)	Create a CLOB object.
InputStream	getInputStream(long lobId, int tableId, long byteCount)	Get the input stream for the given lob
InputStream	getInputStream(long lobId, long byteCount)	Get the input stream for the given lob, only called on server side of a TCP connection.
boolean	isReadOnly()	Whether the storage is read-only
void	removeAllForTable(int tableId)	Remove all LOBs for this table.
void	removeLob(ValueLob lob)	Delete a LOB (from the database, if it is stored there).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.h2.store.LobStorageInterface

close

Field Details

TABLE_ID_SESSION_VARIABLE

public static final int TABLE_ID_SESSION_VARIABLE

The table id for session variables (LOBs not assigned to a table).

See Also:

• Constant Field Values

TABLE_TEMP

public static final int TABLE_TEMP

The table id for temporary objects (not assigned to any object).

See Also:

• Constant Field Values

TABLE_RESULT

public static final int TABLE_RESULT

The table id for result sets.

See Also:

• Constant Field Values

Constructor Details

LobStorageFrontend

public LobStorageFrontend(SessionRemote handler)

Method Details

removeLob

public void removeLob(ValueLob lob)

Description copied from interface: LobStorageInterface

Delete a LOB (from the database, if it is stored there).

Specified by:

removeLob in interface LobStorageInterface

Parameters:

lob - the lob

getInputStream

public InputStream getInputStream(long lobId,
 long byteCount)
                           throws IOException

Description copied from interface: LobStorageInterface

Get the input stream for the given lob, only called on server side of a TCP connection.

Specified by:

getInputStream in interface LobStorageInterface

Parameters:

lobId - the lob id

byteCount - the number of bytes to read, or -1 if not known

Returns:

the stream

Throws:

IOException - on failure

getInputStream

public InputStream getInputStream(long lobId,
 int tableId,
 long byteCount)
                           throws IOException

Description copied from interface: LobStorageInterface

Get the input stream for the given lob

Specified by:

getInputStream in interface LobStorageInterface

Parameters:

lobId - the lob id

tableId - the able id

byteCount - the number of bytes to read, or -1 if not known

Returns:

the stream

Throws:

IOException - on failure

isReadOnly

public boolean isReadOnly()

Description copied from interface: LobStorageInterface

Whether the storage is read-only

Specified by:

isReadOnly in interface LobStorageInterface

Returns:

true if yes

copyLob

public ValueLob copyLob(ValueLob old,
 int tableId)

Description copied from interface: LobStorageInterface

Copy a lob.

Specified by:

copyLob in interface LobStorageInterface

Parameters:

old - the old lob

tableId - the new table id

Returns:

the new lob

removeAllForTable

public void removeAllForTable(int tableId)

Description copied from interface: LobStorageInterface

Remove all LOBs for this table.

Specified by:

removeAllForTable in interface LobStorageInterface

Parameters:

tableId - the table id

createBlob

public ValueBlob createBlob(InputStream in,
 long maxLength)

Description copied from interface: LobStorageInterface

Create a BLOB object.

Specified by:

createBlob in interface LobStorageInterface

Parameters:

in - the input stream

maxLength - the maximum length (-1 if not known)

Returns:

the LOB

createClob

public ValueClob createClob(Reader reader,
 long maxLength)

Create a CLOB object.

Specified by:

createClob in interface LobStorageInterface

Parameters:

reader - the reader

maxLength - the maximum length (-1 if not known)

Returns:

the LOB