org.h2.store

类 LobStorageFrontend

java.lang.Object

org.h2.store.LobStorageFrontend

所有已实现的接口:

LobStorageInterface

public class LobStorageFrontend
extends Object
implements LobStorageInterface

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

字段概要

字段

限定符和类型	字段和说明
static int	TABLE_ID_SESSION_VARIABLE The table id for session variables (LOBs not assigned to a table).
static int	TABLE_RESULT The table id for result sets.
static int	TABLE_TEMP The table id for temporary objects (not assigned to any object).

构造器概要

构造器

构造器和说明
LobStorageFrontend(DataHandler handler)

方法概要

限定符和类型	方法和说明
ValueLobDb	copyLob(ValueLobDb old, int tableId, long length) Copy a lob.
Value	createBlob(InputStream in, long maxLength) Create a BLOB object.
Value	createClob(Reader reader, long maxLength) Create a CLOB object.
InputStream	getInputStream(ValueLobDb lob, byte[] hmac, long byteCount) Get the input stream for the given lob.
void	init() Initialize the lob storage.
boolean	isReadOnly() Whether the storage is read-only
void	removeAllForTable(int tableId) Remove all LOBs for this table.
void	removeLob(ValueLobDb lob) Delete a LOB (from the database, if it is stored there).
void	setTable(ValueLobDb lob, int tableIdSessionVariable) Set the table reference of this lob.

从类继承的方法 java.lang.Object

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

字段详细资料

TABLE_ID_SESSION_VARIABLE

public static final int TABLE_ID_SESSION_VARIABLE

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

另请参阅:

常量字段值

TABLE_TEMP

public static final int TABLE_TEMP

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

另请参阅:

常量字段值

TABLE_RESULT

public static final int TABLE_RESULT

The table id for result sets.

另请参阅:

常量字段值

构造器详细资料

LobStorageFrontend

public LobStorageFrontend(DataHandler handler)

方法详细资料

removeLob

public void removeLob(ValueLobDb lob)

从接口复制的说明: LobStorageInterface

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

指定者:

removeLob 在接口中 LobStorageInterface

参数:

lob - the lob

getInputStream

public InputStream getInputStream(ValueLobDb lob,
                                  byte[] hmac,
                                  long byteCount)
                           throws IOException

Get the input stream for the given lob.

指定者:

getInputStream 在接口中 LobStorageInterface

参数:

lob - the lob

hmac - the message authentication code (for remote input streams)

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

返回:

the stream

抛出:

IOException

isReadOnly

public boolean isReadOnly()

从接口复制的说明: LobStorageInterface

Whether the storage is read-only

指定者:

isReadOnly 在接口中 LobStorageInterface

返回:

true if yes

copyLob

public ValueLobDb copyLob(ValueLobDb old,
                          int tableId,
                          long length)

从接口复制的说明: LobStorageInterface

Copy a lob.

指定者:

copyLob 在接口中 LobStorageInterface

参数:

old - the old lob

tableId - the new table id

length - the length

返回:

the new lob

setTable

public void setTable(ValueLobDb lob,
                     int tableIdSessionVariable)

从接口复制的说明: LobStorageInterface

Set the table reference of this lob.

指定者:

setTable 在接口中 LobStorageInterface

参数:

lob - the lob

tableIdSessionVariable - the table

removeAllForTable

public void removeAllForTable(int tableId)

从接口复制的说明: LobStorageInterface

Remove all LOBs for this table.

指定者:

removeAllForTable 在接口中 LobStorageInterface

参数:

tableId - the table id

createBlob

public Value createBlob(InputStream in,
                        long maxLength)

从接口复制的说明: LobStorageInterface

Create a BLOB object.

指定者:

createBlob 在接口中 LobStorageInterface

参数:

in - the input stream

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

返回:

the LOB

createClob

public Value createClob(Reader reader,
                        long maxLength)

Create a CLOB object.

指定者:

createClob 在接口中 LobStorageInterface

参数:

reader - the reader

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

返回:

the LOB

init

public void init()

从接口复制的说明: LobStorageInterface

Initialize the lob storage.

指定者:

init 在接口中 LobStorageInterface