Relation

public class Relation,
implements Serializable

Relation describes an SQL relation, that is determined with name and the arity, and in addition it can contain primary key definition.

private long id;
private java.lang.String name;
private int arity;
private int primaryKey; 
private java.lang.String description;
private java.util.ArrayList<java.lang.String> attributeNames;

public Relation (java.lang.String name, 
                 int arity, 
                 int primaryKey, 
                 java.lang.String description)

Constructor for relation with well known arity. Attributes are load inside the function by calling readAttributesNamesInDescritpion

Called by:

• it.unibz.inf.magik.additional.InvolvedVariablesDetector
• it.unibz.inf.magik.db.DatabaseConnector
• it.unibz.inf.magik.test.CycleDetectionTest
• it.unibz.inf.magik.test.TestFK
• it.unibz.inf.magik.test.TestFK2
• it.unibz.inf.magik.test.TestHardCaseFDCandFK
• it.unibz.inf.magik.test.TestTCQCReasonerBlackWhiteExample
• it.unibz.inf.magik.test.TestTCQCReasonerPlainCompanyEx
• it.unibz.inf.magik.test.TestValQueryProblem
• it.unibz.inf.magik.test.TestTCQCReasonerUnderFDC
• it.unibz.inf.magik.test.TestQueryClass
• it.unibz.inf.magik.test.TestQueryGeneralization
• it.unibz.inf.magik.test.TestQueryToSQL
• it.unibz.inf.magik.test.TestTCQCReasonerFKandFD
• it.unibz.inf.magik.test.TestTCQCReasonerPlainSchoolEx
• it.unibz.inf.magik.test.TestTCQCReasonerTCSuggestions
• it.unibz.inf.magik.test.TestPrimaryVioation

Parameters:

• name - name of the relation
• arity - arity of the relation
• primaryKey - determined with first place in the relation
• description - string of the attributes of the relation, separated by comma

public Relation (java.lang.String name, 
                 int primaryKey, 
                 java.lang.String description)

Constructor for relation without knowning arity. Attributes are load inside the function by calling readAttributesNamesInDescritpion

Called by:

• it.unibz.inf.magik.web.SessionControl
• it.unibz.inf.magik.test.TestSimpleComparison

Parameters:

• name - name of the relation
• primaryKey - determined with first place in the relation
• description - string of the attributes of the relation, separated by comma

public static java.util.ArrayList<java.lang.String> readAttributesNamesInDescription(java.lang.String description)

Parse the attribute name of a relation from the description field

Parameters:

• description - string with attributes separated by comma

Returns:

• list of the attribute parsed

public int getAttributePosition (java.lang.String attributeName)

Get attribute position in the relation

Parameters:

• attributeName - attribute to search

Returns:

• position in the relation, -1 if not in the relation

public java.util.ArrayList<java.lang.String> getAttributeNames()
public void setAttributeNames(java.util.ArrayList<java.lang.String> attributeNames) 
 
public java.lang.String getName() 
public void setName(java.lang.String name) 
 
public int getArity() 
public void setArity(int arity) 
 
public int getPrimaryKey()
public void setPrimaryKey(int primaryKey) 
 
public long getId()
public void setId(long id)

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