Field Detail

• doMeSlot

  protected int doMeSlot

• fieldId

  protected int fieldId

• preparedLog

  protected transient ByteArray preparedLog

Constructor Detail

• UpdateFieldOperation

  UpdateFieldOperation​(RawTransaction t,
                       BasePage page,
                       int slot,
                       int recordId,
                       int fieldId,
                       java.lang.Object column,
                       LogicalUndo undo)
                throws StandardException

  Throws:

  StandardException

• UpdateFieldOperation

  public UpdateFieldOperation()

Method Detail

• writeExternal

  public void writeExternal​(java.io.ObjectOutput out)
                     throws java.io.IOException

  Specified by:

  writeExternal in interface java.io.Externalizable

  Overrides:

  writeExternal in class LogicalPageOperation

  Throws:

  java.io.IOException

• readExternal

  public void readExternal​(java.io.ObjectInput in)
                    throws java.io.IOException,
                           java.lang.ClassNotFoundException

  Read this in

  Specified by:

  readExternal in interface java.io.Externalizable

  Overrides:

  readExternal in class LogicalPageOperation

  Throws:

  java.io.IOException - error reading from log stream

  java.lang.ClassNotFoundException - log stream corrupted

• getTypeFormatId

  public int getTypeFormatId()

  Return my format identifier.

  Returns:

  The identifier. (A UUID stuffed in an array of 16 bytes).

• doMe

  public void doMe​(Transaction xact,
                   LogInstant instant,
                   LimitObjectInput in)
            throws StandardException,
                   java.io.IOException

  Change the value of a field.

  Parameters:

  xact - the Transaction

  instant - the log instant of this operation

  in - optional data

  Throws:

  java.io.IOException - Can be thrown by any of the methods of ObjectInput.

  StandardException - Standard Derby policy.

  See Also:

  Loggable.doMe(org.apache.derby.iapi.store.raw.Transaction, org.apache.derby.iapi.store.raw.log.LogInstant, org.apache.derby.iapi.services.io.LimitObjectInput)

• undoMe

  public void undoMe​(Transaction xact,
                     BasePage undoPage,
                     int undoRecordId,
                     LogInstant CLRInstant,
                     LimitObjectInput in)
              throws StandardException,
                     java.io.IOException

  Restore field to its old value.

  Specified by:

  undoMe in class LogicalPageOperation

  Parameters:

  xact - the Transaction doing the rollback

  undoPage - the page to rollback changes on

  undoRecordId - the recordId to rollback changes on

  CLRInstant - the log instant of this (PageUndo) operation

  in - optional data for the rollback operation

  Throws:

  java.io.IOException - Can be thrown by any of the methods of ObjectInput.

  StandardException - Standard Derby policy.

  See Also:

  LogicalPageOperation.undoMe(org.apache.derby.iapi.store.raw.Transaction, org.apache.derby.impl.store.raw.data.BasePage, int, org.apache.derby.iapi.store.raw.log.LogInstant, org.apache.derby.iapi.services.io.LimitObjectInput)

• restoreLoggedRow

  public void restoreLoggedRow​(java.lang.Object[] row,
                               LimitObjectInput in)
                        throws StandardException,
                               java.io.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:

  java.io.IOException - error reading from log stream

  StandardException - Standard Derby error policy

  See Also:

  LogicalUndo

• restoreMe

  public void restoreMe​(Transaction xact,
                        BasePage undoPage,
                        LogInstant CLRInstant,
                        LimitObjectInput in)
                 throws StandardException,
                        java.io.IOException

  restore the before image of the page

  Specified by:

  restoreMe in class PageBasicOperation

  Parameters:

  xact - the Transaction doing the rollback

  undoPage - the page to rollback changes on

  CLRInstant - the log instant of this (PageUndo) operation

  in - optional data for the rollback operation

  Throws:

  StandardException - Standard Derby Error Policy

  java.io.IOException - problem reading the complete log record from the input stream

• getPreparedLog

  public ByteArray 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 interface Loggable

  Overrides:

  getPreparedLog in class PageBasicOperation

• writeOptionalDataToBuffer

  private void writeOptionalDataToBuffer​(RawTransaction t,
                                         java.lang.Object column)
                                  throws StandardException,
                                         java.io.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:

  java.io.IOException - Can be thrown by any of the methods of ObjectOutput.

  StandardException - Standard Derby policy.

• toString

  public java.lang.String toString()

  DEBUG: Print self.

  Overrides:

  toString in class PageBasicOperation