org.apache.derby.impl.sql.execute

Class MatchingClauseConstantAction

java.lang.Object

org.apache.derby.impl.sql.execute.MatchingClauseConstantAction

All Implemented Interfaces:

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

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

Describes the execution machinery needed to evaluate a WHEN [ NOT ] MATCHING clause of a MERGE statement.

See Also:

Serialized Form

Field Summary

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
MatchingClauseConstantAction() 0-arg constructor needed by Formatable machinery
MatchingClauseConstantAction(int clauseType, java.lang.String matchRefinementName, ResultDescription thenColumnSignature, java.lang.String rowMakingMethodName, java.lang.String resultSetFieldName, java.lang.String actionMethodName, ConstantAction thenAction) Construct from thin air.

Method Summary

Modifier and Type	Method and Description
int	clauseType() Get the clause type: WHEN_NOT_MATCHED_THEN_INSERT, WHEN_MATCHED_THEN_UPDATE, WHEN_MATCHED_THEN_DELETE
void	executeConstantAction(Activation activation) Run the ConstantAction.
void	executeConstantAction(Activation activation, org.apache.derby.impl.sql.execute.TemporaryRowHolderImpl thenRows)
int	getTypeFormatId() Get the formatID which corresponds to this class.
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

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

Constructor Detail

MatchingClauseConstantAction

public MatchingClauseConstantAction()

0-arg constructor needed by Formatable machinery

MatchingClauseConstantAction

public MatchingClauseConstantAction(int clauseType,
                                    java.lang.String matchRefinementName,
                                    ResultDescription thenColumnSignature,
                                    java.lang.String rowMakingMethodName,
                                    java.lang.String resultSetFieldName,
                                    java.lang.String actionMethodName,
                                    ConstantAction thenAction)

Construct from thin air.

Parameters:

clauseType - WHEN_NOT_MATCHED_THEN_INSERT, WHEN_MATCHED_THEN_UPDATE, WHEN_MATCHED_THEN_DELETE

matchRefinementName - Name of the method which evaluates the boolean expression in the WHEN clause.

thenColumnSignature - The shape of the row which goes into the temporary table.

rowMakingMethodName - Name of the method which populates the "then" row with expressions from the driving left join.

resultSetFieldName - Name of the field which will be stuffed at runtime with the temporary table of relevant rows.

actionMethodName - Name of the method which invokes the INSERT/UPDATE/DELETE action.

thenAction - The ConstantAction describing the associated INSERT/UPDATE/DELETE action.

Method Detail

clauseType

public int clauseType()

Get the clause type: WHEN_NOT_MATCHED_THEN_INSERT, WHEN_MATCHED_THEN_UPDATE, WHEN_MATCHED_THEN_DELETE

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

executeConstantAction

public void executeConstantAction(Activation activation,
                                  org.apache.derby.impl.sql.execute.TemporaryRowHolderImpl thenRows)
                           throws StandardException

Throws:

StandardException

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