Class UpdateFieldOperation
java.lang.Object
org.apache.derby.impl.store.raw.data.PageBasicOperation
org.apache.derby.impl.store.raw.data.LogicalPageOperation
org.apache.derby.impl.store.raw.data.UpdateFieldOperation
- All Implemented Interfaces:
Externalizable
,Serializable
,Formatable
,TypedFormat
,Loggable
,LogicalUndoable
,RePreparable
,Undoable
Represents the update of a particular field of a row on a page.
- See Also:
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Field Summary
FieldsFields inherited from class org.apache.derby.impl.store.raw.data.LogicalPageOperation
recordId, undo
Fields inherited from class org.apache.derby.impl.store.raw.data.PageBasicOperation
containerHdl, foundHere, page
Fields inherited from interface org.apache.derby.iapi.store.raw.Loggable
ABORT, BI_LOG, CHECKSUM, COMMIT, COMPENSATION, FILE_RESOURCE, FIRST, LAST, PREPARE, RAWSTORE, XA_NEEDLOCK
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Constructor Summary
ConstructorsConstructorDescriptionUpdateFieldOperation
(RawTransaction t, BasePage page, int slot, int recordId, int fieldId, Object column, LogicalUndo undo) -
Method Summary
Modifier and TypeMethodDescriptionvoid
doMe
(Transaction xact, LogInstant instant, LimitObjectInput in) Change the value of a field.the default for optional data is set to null.int
Return my format identifier.void
Read this invoid
restoreLoggedRow
(Object[] row, LimitObjectInput in) Restore the row stored in the optional data of the log record.void
restoreMe
(Transaction xact, BasePage undoPage, LogInstant CLRInstant, LimitObjectInput in) restore the before image of the pagetoString()
DEBUG: Print self.void
undoMe
(Transaction xact, BasePage undoPage, int undoRecordId, LogInstant CLRInstant, LimitObjectInput in) Restore field to its old value.void
private void
writeOptionalDataToBuffer
(RawTransaction t, Object column) Write the old column value and and new column value as optional data.Methods inherited from class org.apache.derby.impl.store.raw.data.LogicalPageOperation
generateUndo, getContainer, getRecordHandle, reclaimPrepareLocks, resetRecordHandle
Methods inherited from class org.apache.derby.impl.store.raw.data.PageBasicOperation
findpage, getPage, getPageForRedoRecovery, getPageId, getPageVersion, group, needsRedo, releaseResource, resetPageNumber
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface org.apache.derby.iapi.store.raw.Loggable
group, needsRedo, releaseResource
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Field Details
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doMeSlot
protected int doMeSlot -
fieldId
protected int fieldId -
preparedLog
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Constructor Details
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UpdateFieldOperation
UpdateFieldOperation(RawTransaction t, BasePage page, int slot, int recordId, int fieldId, Object column, LogicalUndo undo) throws StandardException - Throws:
StandardException
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UpdateFieldOperation
public UpdateFieldOperation()
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Method Details
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writeExternal
- Specified by:
writeExternal
in interfaceExternalizable
- Overrides:
writeExternal
in classLogicalPageOperation
- Throws:
IOException
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readExternal
Read this in- Specified by:
readExternal
in interfaceExternalizable
- Overrides:
readExternal
in classLogicalPageOperation
- Throws:
IOException
- error reading from log streamClassNotFoundException
- log stream corrupted
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getTypeFormatId
public int getTypeFormatId()Return my format identifier.- Returns:
- The identifier. (A UUID stuffed in an array of 16 bytes).
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doMe
public void doMe(Transaction xact, LogInstant instant, LimitObjectInput in) throws StandardException, IOException Change the value of a field.- Parameters:
xact
- the Transactioninstant
- the log instant of this operationin
- optional data- Throws:
IOException
- Can be thrown by any of the methods of ObjectInput.StandardException
- Standard Derby policy.- See Also:
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undoMe
public void undoMe(Transaction xact, BasePage undoPage, int undoRecordId, LogInstant CLRInstant, LimitObjectInput in) throws StandardException, IOException Restore field to its old value.- Specified by:
undoMe
in classLogicalPageOperation
- Parameters:
xact
- the Transaction doing the rollbackundoPage
- the page to rollback changes onundoRecordId
- the recordId to rollback changes onCLRInstant
- the log instant of this (PageUndo) operationin
- optional data for the rollback operation- Throws:
IOException
- Can be thrown by any of the methods of ObjectInput.StandardException
- Standard Derby policy.- See Also:
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restoreLoggedRow
public void restoreLoggedRow(Object[] row, LimitObjectInput in) throws StandardException, IOException Restore the row stored in the optional data of the log record.- Parameters:
row
- an IN/OUT parameter, caller passed in the row with the correct column number and type, the log operation will restore the row with the optional data stored in the log record.- Throws:
IOException
- error reading from log streamStandardException
- Standard Derby error policy- See Also:
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restoreMe
public void restoreMe(Transaction xact, BasePage undoPage, LogInstant CLRInstant, LimitObjectInput in) throws StandardException, IOException restore the before image of the page- Specified by:
restoreMe
in classPageBasicOperation
- Parameters:
xact
- the Transaction doing the rollbackundoPage
- the page to rollback changes onCLRInstant
- the log instant of this (PageUndo) operationin
- optional data for the rollback operation- Throws:
StandardException
- Standard Derby Error PolicyIOException
- problem reading the complete log record from the input stream
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getPreparedLog
Description copied from class:PageBasicOperation
the default for optional data is set to null. If an operation has optional data, the operation need to prepare the optional data for this method. WARNING: If a log operation extends this class, and the operation has optional data, it MUST overwrite this method to return a ByteArray that contains the optional data.- Specified by:
getPreparedLog
in interfaceLoggable
- Overrides:
getPreparedLog
in classPageBasicOperation
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writeOptionalDataToBuffer
private void writeOptionalDataToBuffer(RawTransaction t, Object column) throws StandardException, IOException Write the old column value and and new column value as optional data. If logical undo, writes out the entire row's before image.- Throws:
IOException
- Can be thrown by any of the methods of ObjectOutput.StandardException
- Standard Derby policy.
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toString
DEBUG: Print self.- Overrides:
toString
in classPageBasicOperation
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