org.apache.derby.impl.sql.execute

Class MergeConstantAction

java.lang.Object

org.apache.derby.impl.sql.execute.MergeConstantAction

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, Formatable, TypedFormat, ConstantAction

public class MergeConstantAction
extends java.lang.Object
implements ConstantAction, Formatable

Describes the execution machinery needed to evaluate a MERGE statement.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private MatchingClauseConstantAction[]	_matchingClauses
private static int	FIRST_VERSION Serial version produced by the serialver utility.

Fields inherited from interface org.apache.derby.iapi.sql.execute.ConstantAction

WHEN_MATCHED_THEN_DELETE, WHEN_MATCHED_THEN_UPDATE, WHEN_NOT_MATCHED_THEN_INSERT

Constructor Summary

Constructors

Constructor and Description
MergeConstantAction() 0-arg constructor needed by Formatable machinery
MergeConstantAction(ConstantAction[] matchingClauses) Construct from thin air.

Method Summary

Modifier and Type	Method and Description
void	executeConstantAction(Activation activation) Run the ConstantAction.
MatchingClauseConstantAction	getMatchingClause(int idx) Get the ith (0-based) matching clause
int	getTypeFormatId() Get the formatID which corresponds to this class.
int	matchingClauseCount() Get the number of matching clauses
void	readExternal(java.io.ObjectInput in) Read this object from a stream of stored objects.
void	writeExternal(java.io.ObjectOutput out) Write this object to a stream of stored objects.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

FIRST_VERSION

private static final int FIRST_VERSION

Serial version produced by the serialver utility. Needed in order to make serialization work reliably across different compilers.

See Also:

Constant Field Values

_matchingClauses

private MatchingClauseConstantAction[] _matchingClauses

Constructor Detail

MergeConstantAction

public MergeConstantAction()

0-arg constructor needed by Formatable machinery

MergeConstantAction

public MergeConstantAction(ConstantAction[] matchingClauses)

Construct from thin air.

Parameters:

matchingClauses - Constant actions for WHEN [ NOT ] MATCHED clauses.

Method Detail

matchingClauseCount

public int matchingClauseCount()

Get the number of matching clauses

getMatchingClause

public MatchingClauseConstantAction getMatchingClause(int idx)

Get the ith (0-based) matching clause

executeConstantAction

public void executeConstantAction(Activation activation)
                           throws StandardException

Description copied from interface: ConstantAction

Run the ConstantAction.

Specified by:

executeConstantAction in interface ConstantAction

Parameters:

activation - The execution environment for this constant action.

Throws:

StandardException - Thrown on failure

readExternal

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

Read this object from a stream of stored objects.

Specified by:

readExternal in interface java.io.Externalizable

Parameters:

in - read this.

Throws:

java.io.IOException - thrown on error

java.lang.ClassNotFoundException - thrown on error

writeExternal

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

Write this object to a stream of stored objects.

Specified by:

writeExternal in interface java.io.Externalizable

Parameters:

out - write bytes here.

Throws:

java.io.IOException - thrown on error

getTypeFormatId

public int getTypeFormatId()

Get the formatID which corresponds to this class.

Specified by:

getTypeFormatId in interface TypedFormat

Returns:

the formatID of this class