org.h2.store

接口 LobStorageInterface

所有已知实现类:

LobStorageFrontend, LobStorageMap

public interface LobStorageInterface

A mechanism to store and retrieve lob data.

方法概要

限定符和类型	方法和说明
default void	close() Close LobStorage and release all resources
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).

方法详细资料

createClob

ValueClob createClob(Reader reader,
                     long maxLength)

Create a CLOB object.

参数:

reader - the reader

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

返回:

the LOB

createBlob

ValueBlob createBlob(InputStream in,
                     long maxLength)

Create a BLOB object.

参数:

in - the input stream

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

返回:

the LOB

copyLob

ValueLob copyLob(ValueLob old,
                 int tableId)

Copy a lob.

参数:

old - the old lob

tableId - the new table id

返回:

the new lob

getInputStream

InputStream getInputStream(long lobId,
                           long byteCount)
                    throws IOException

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

参数:

lobId - the lob id

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

返回:

the stream

抛出:

IOException - on failure

getInputStream

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

Get the input stream for the given lob

参数:

lobId - the lob id

tableId - the able id

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

返回:

the stream

抛出:

IOException - on failure

removeLob

void removeLob(ValueLob lob)

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

参数:

lob - the lob

removeAllForTable

void removeAllForTable(int tableId)

Remove all LOBs for this table.

参数:

tableId - the table id

isReadOnly

boolean isReadOnly()

Whether the storage is read-only

返回:

true if yes

close

default void close()

Close LobStorage and release all resources