DbStorage.manager
Class LobManager
java.lang.Object
DbStorage.manager.LobManager
- public final class LobManager
- extends java.lang.Object
This class implements the metods to storage LOB objects.
Method Summary |
static int |
read(DbStorageManager dbsm,
long transactionNumber,
PhysicalID id,
long from,
int maxLength,
byte[] b,
int off)
Reads from a LOB datum and stores the readed in a byte array. |
static void |
setSize(DbStorageManager dbsm,
long transactionNumber,
PhysicalID id,
long newSize)
Changes the size of the LOB datum. |
static int |
write(DbStorageManager dbsm,
long transactionNumber,
PhysicalID id,
long from,
int maxLength,
byte[] b,
int off)
Writes a byte array into a LOB datum. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
MAX_LOB_SIZE
public static final long MAX_LOB_SIZE
- See Also:
- Constant Field Values
LobManager
public LobManager()
setSize
public static void setSize(DbStorageManager dbsm,
long transactionNumber,
PhysicalID id,
long newSize)
throws storage.StorageException,
java.io.IOException,
OutOfLOBException
- Changes the size of the LOB datum.
- Parameters:
dbsm
- The data base storage manager where the operation will be performed.transactionNumber
- The number of transaction.id
- The identifier of the datum to resize.newSize
- The new size of the datum.
- Throws:
storage.StorageException
java.io.IOException
OutOfLOBException
write
public static int write(DbStorageManager dbsm,
long transactionNumber,
PhysicalID id,
long from,
int maxLength,
byte[] b,
int off)
throws storage.StorageException,
java.io.IOException,
OutOfLOBException
- Writes a byte array into a LOB datum.
- Parameters:
dbsm
- The data base storage manager where the operation will be performed.transactionNumber
- The number of transaction.id
- The identifier of the datum to wrote.from
- The position of the LOB from which the witting starts.maxLength
- The maximum number of bytes to write.b
- The array contains the bytes to write.off
- The offset of b
from which the bytes are retrieved.
- Returns:
- The number of written bytes.
- Throws:
storage.StorageException
java.io.IOException
OutOfLOBException
read
public static int read(DbStorageManager dbsm,
long transactionNumber,
PhysicalID id,
long from,
int maxLength,
byte[] b,
int off)
throws storage.StorageException,
java.io.IOException,
OutOfLOBException
- Reads from a LOB datum and stores the readed in a byte array.
- Parameters:
dbsm
- The data base storage manager where the operation will be performed.transactionNumber
- The number of transaction.id
- The identifier of the datum to read.from
- The position of the LOB from which the reading starts.maxLength
- The maximum number of bytes to read.b
- The array where the readed bytes will be stored.off
- The offset of b
from which the readed bytes are stored.
- Returns:
- The number of readed bytes.
- Throws:
storage.StorageException
java.io.IOException
OutOfLOBException