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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.iapi.store.raw

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Class Diagram

Java Document (Java Doc)

org.apache.derby.iapi.store.raw .RecordHandle

All known Subclasses:   org.apache.derby.impl.store.raw.data .RecordId,
RecordHandle
public interface RecordHandle extends Lockable(Code)
A handle to a record within a container. This interface does not provide an information about the data of the record, it is only used to perform updates, deletes and allow ordered record manipulation. MT - immutable
See Also:   Page

Field Summary
final public static int DEALLOCATE_PROTECTION_HANDLE
     A lock with this recordHandle protects this deallocated page from being freed and reallocated.
final public static int FIRST_RECORD_ID
     First recordId that is used to identify a record.
final public static int INVALID_RECORD_HANDLE

final public static int PREVIOUS_KEY_HANDLE
     A lock with this recordHandle is used to lock the range of keys between the first key in a btree and keys previous to it.
final public static int RECORD_ID_PROTECTION_HANDLE
     A lock with this recordHandle protects all the recordIds in the page. No recordId can disappear while this lock is held.
final public static int RESERVED4_RECORD_HANDLE

final public static int RESERVED5_RECORD_HANDLE


Method Summary
public ContainerKey getContainerId()
     Return the identity of my container.
public int getId()
     Obtain the page-unique identifier for this record.
public Object getPageId()
     Return the identity of my Page.
public long getPageNumber()
     Obtain the page number this record lives on.
public int getSlotNumberHint()
     What slot number might the record be at?
The raw store guarantees that the record handle of a record will not change, but it's slot number may.

Field Detail
DEALLOCATE_PROTECTION_HANDLE
final public static int DEALLOCATE_PROTECTION_HANDLE(Code)
A lock with this recordHandle protects this deallocated page from being freed and reallocated. This lock is released when the transaction that deallocated the page terminates, at which point the page can be freed if the transaction committed.

FIRST_RECORD_ID
final public static int FIRST_RECORD_ID(Code)
First recordId that is used to identify a record.

INVALID_RECORD_HANDLE
final public static int INVALID_RECORD_HANDLE(Code)
An invalid record handle

PREVIOUS_KEY_HANDLE
final public static int PREVIOUS_KEY_HANDLE(Code)
A lock with this recordHandle is used to lock the range of keys between the first key in a btree and keys previous to it.

RECORD_ID_PROTECTION_HANDLE
final public static int RECORD_ID_PROTECTION_HANDLE(Code)
A lock with this recordHandle protects all the recordIds in the page. No recordId can disappear while this lock is held. New recordIds may appear while this lock is held.

RESERVED4_RECORD_HANDLE
final public static int RESERVED4_RECORD_HANDLE(Code)
Reserve for future use - name it and define it when you have a need to use one

RESERVED5_RECORD_HANDLE
final public static int RESERVED5_RECORD_HANDLE(Code)

Method Detail
getContainerId
public ContainerKey getContainerId()(Code)
Return the identity of my container.

getId
public int getId()(Code)
Obtain the page-unique identifier for this record. This id combined with a page number is guaranteed to be unique within a container.

getPageId
public Object getPageId()(Code)
Return the identity of my Page.

getPageNumber
public long getPageNumber()(Code)
Obtain the page number this record lives on.

getSlotNumberHint
public int getSlotNumberHint()(Code)
What slot number might the record be at?
The raw store guarantees that the record handle of a record will not change, but it's slot number may. An implementation of a record handle may provide a hint of the slot number, which may help routines like Page.getSlotNumber() perform better.
If an implementation does not track slot numbers at all the implementation should just always return Page.FIRST_SLOT_NUMBER. The slot number the record handle may be at.

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