edu.udo.cs.miningmart.operator
Class CreatePrimaryKey

java.lang.Object
  edu.udo.cs.miningmart.operator.ExecutableOperator
      edu.udo.cs.miningmart.operator.ConceptOperator
          edu.udo.cs.miningmart.operator.SingleCSOperator
              edu.udo.cs.miningmart.operator.CreatePrimaryKey

public class CreatePrimaryKey
extends SingleCSOperator

This operator is able to convert a view with no key and maybe multiple occurences of tuples into a view with a single primary key attribute. Elimination of multiple tuple occurences can be selected as a parameter.

Version:

$Id: CreatePrimaryKey.java,v 1.7 2006/09/29 17:20:01 euler Exp $

Author:

Martin Scholz

Field Summary

Fields inherited from class edu.udo.cs.miningmart.operator.ConceptOperator

suffixForIntermediateViews

Fields inherited from class edu.udo.cs.miningmart.operator.ExecutableOperator

generatedSQLDefinitions

Constructor Summary

CreatePrimaryKey()

Method Summary

protected java.lang.String	generateColumns(Columnset csForOutputConcept) The super method is enhanced by creating a new Column for the key.
java.lang.String	generateSQLDefinition(java.lang.String selectPart) This method must return the SQL definition of the newly created ColumnSet.
boolean	getAllowDuplicates() Getter for the parameter "AllowDuplicates"
BaseAttribute	getPrimaryKey() Getter for the parameter "PrimaryKey"
java.lang.String	getTypeOfNewColumnSet() This method must return the entry String for the M4 table "Columnset_t", indicating whether the new Columnset is a view or a table.
protected boolean	mustCopyFeature(java.lang.String nameOfFeature) This method is for operators that do not copy all Features of the input concept to the output concept.

Methods inherited from class edu.udo.cs.miningmart.operator.SingleCSOperator

generateColumnSetsForOp, generateSQLDefinition, getNewCSName, getTypeOfNewColumnSet, handleExtraOutputFeature

Methods inherited from class edu.udo.cs.miningmart.operator.ConceptOperator

compileStatement, createMetadata, createMetadataForOneBA, createSingleColumnSet, createStatement, getInputConcept, getNewCSName, getOutputConcept, getStringForSelection, setNewCSMultiStepBranch

Methods inherited from class edu.udo.cs.miningmart.operator.ExecutableOperator

autoPrint, checkConditions, doPrint, doPrint, execute, executeBusinessSingleValueSqlRead, executeBusinessSingleValueSqlReadL, executeBusinessSqlRead, executeBusinessSqlWrite, executeM4SingleValueSqlRead, executeM4SingleValueSqlReadL, executeM4SqlRead, executeM4SqlWrite, getArtificalColumnName, getBusinessDbms, getHighestLoopNr, getM4Db, getM4Dbms, getM4ObjectFromCache, getName, getNextM4SequenceValue, getNumberOfLoops, getOperator, getOpParamsIterator, getParameter, getParameter, getParameterObjectsOfAllLoops, getSingleParameter, getSingleParameter, getStep, giveWarningForChangedInputData, handleAssertions, isDeselectedParameter, isLoopable, isManual, isStepable, load, print, putM4ObjectToCache, showCreateStatement, storedProceduresAvailable

Methods inherited from class java.lang.Object

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

Constructor Detail

CreatePrimaryKey

public CreatePrimaryKey()

Method Detail

getTypeOfNewColumnSet

public java.lang.String getTypeOfNewColumnSet()

Description copied from class: SingleCSOperator

This method must return the entry String for the M4 table "Columnset_t", indicating whether the new Columnset is a view or a table.

Specified by:

getTypeOfNewColumnSet in class SingleCSOperator

Returns:

The type of the new Columnset, either "V" or "T".

See Also:

SingleCSOperator.getTypeOfNewColumnSet()

generateColumns

protected java.lang.String generateColumns(Columnset csForOutputConcept)
                                    throws M4CompilerError

The super method is enhanced by creating a new Column for the key. The key is realized as a virtual Column, so the return value of the super method is not changed.

Overrides:

generateColumns in class ConceptOperator

Parameters:

csForOutputConcept - The ColumnSet for which Columns are to be produced.

Returns:

A String for the "SELECT"-part of the view definition for the given ColumnSet.

Throws:

M4CompilerError

See Also:

miningmart.operator.ConceptOperator#generateColumns(Columnset)

generateSQLDefinition

public java.lang.String generateSQLDefinition(java.lang.String selectPart)
                                       throws M4CompilerError

Description copied from class: SingleCSOperator

This method must return the SQL definition of the newly created ColumnSet.

Specified by:

generateSQLDefinition in class SingleCSOperator

Parameters:

selectPart - The SQL string between "SELECT" and "FROM" for the SQL definition to be returned.

Returns:

The SQL definition for the new ColumnSet.

Throws:

M4CompilerError

See Also:

SingleCSOperator.generateSQLDefinition(String)

mustCopyFeature

protected boolean mustCopyFeature(java.lang.String nameOfFeature)
                           throws M4CompilerError

Description copied from class: ConceptOperator

This method is for operators that do not copy all Features of the input concept to the output concept.

Specified by:

mustCopyFeature in class ConceptOperator

Parameters:

nameOfFeature - Name of the feature in question.

Returns:

TRUE if this feature should be copied to the output concept, FALSE if not.

Throws:

M4CompilerError

See Also:

ConceptOperator.mustCopyFeature(String)

getAllowDuplicates

public boolean getAllowDuplicates()
                           throws M4CompilerError

Getter for the parameter "AllowDuplicates"

Returns:

a boolean, true means that duplicates are allowed, the default is false.

Throws:

M4CompilerError

getPrimaryKey

public BaseAttribute getPrimaryKey()
                            throws M4CompilerError

Getter for the parameter "PrimaryKey"

Returns:

a BaseAttribute

Throws:

M4CompilerError