be.SIRAPRISE.client
Class ServerUpdateCommand

java.lang.Object
  be.SIRAPRISE.client.ServerCommand
      be.SIRAPRISE.client.ServerAssignmentCommand
          be.SIRAPRISE.client.ServerSingleAssignmentCommand
              be.SIRAPRISE.client.ServerUpdateCommand

public final class ServerUpdateCommand
extends ServerSingleAssignmentCommand

A ServerUpdateCommand consists of three portions :

• The target relvar name
• The relational expression defining which tuples in the target relvar will be affected (=deleted) by the update
• The specification of the changes that have to be applied to all affected tuples, i.e. the specification of how to compute, for each affected tuple, what the replacing tuple will be.

Author:

Erwin

Constructor Summary

ServerUpdateCommand(java.lang.String targetRelvarName, java.lang.String deleteRelationExpressionText, java.lang.String changes)
Creates the ExecUpdateCommand

Method Summary

java.lang.String	getChanges() Gets The textual representation of the RA formula defining how to compute the replacing tuples.
java.lang.String	getCommandParametersText() Gets the full textual representation of the command's parameters
java.lang.String	getDeleteRelationExpressionText() Gets The textual representation of the RA formula defining the relation to be deleted from the target
java.lang.String	getFullCommandText() Gets the full textual representation of the command
void	writeAssignmentTypeSpecificToStream(java.io.DataOutputStream outputStream)

Methods inherited from class be.SIRAPRISE.client.ServerSingleAssignmentCommand

getTargetRelvarName, writeToStream

Methods inherited from class be.SIRAPRISE.client.ServerCommand

getCommandObjectFor, getCommandObjectFrom, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ServerUpdateCommand

public ServerUpdateCommand(java.lang.String targetRelvarName,
                           java.lang.String deleteRelationExpressionText,
                           java.lang.String changes)

Creates the ExecUpdateCommand

Parameters:

targetRelvarName - The target relvar Name

deleteRelationExpressionText - The textual representation of the RA formula defining the relation to be deleted from the target

changes - The textual representation of the RA formula defining how to compute the replacing tuples. May not be enclosed in '(' and ')'.

Method Detail

getChanges

public final java.lang.String getChanges()

Gets The textual representation of the RA formula defining how to compute the replacing tuples. Is not be enclosed in '(' and ')'.

Returns:

The textual representation of the RA formula defining how to compute the replacing tuples. Is not be enclosed in '(' and ')'.

getCommandParametersText

public java.lang.String getCommandParametersText()

Description copied from class: ServerCommand

Gets the full textual representation of the command's parameters

Specified by:

getCommandParametersText in class ServerCommand

Returns:

the full textual representation of the command's parameters

getDeleteRelationExpressionText

public final java.lang.String getDeleteRelationExpressionText()

Gets The textual representation of the RA formula defining the relation to be deleted from the target

Returns:

The textual representation of the RA formula defining the relation to be deleted from the target

getFullCommandText

public java.lang.String getFullCommandText()

Description copied from class: ServerCommand

Gets the full textual representation of the command

Specified by:

getFullCommandText in class ServerCommand

Returns:

the full textual representation of the command

writeAssignmentTypeSpecificToStream

public void writeAssignmentTypeSpecificToStream(java.io.DataOutputStream outputStream)
                                         throws java.io.IOException

Throws:

java.io.IOException