Extension SDK 9.0.5

oracle.jdeveloper.cm.ds.db
Class UniqueConstraint

java.lang.Object
  extended byoracle.jdeveloper.cm.ds.db.AbstractDBObject
      extended byoracle.jdeveloper.cm.ds.db.Constraint
          extended byoracle.jdeveloper.cm.ds.db.ColumnConstraint
              extended byoracle.jdeveloper.cm.ds.db.UniqueConstraint
All Implemented Interfaces:
Copyable, DBObject, Subject
Direct Known Subclasses:
PKConstraint

public class UniqueConstraint
extends ColumnConstraint

A UniqueConstraint prohibits multiple rows from having the same value in the same column or combination of columns but allows some values to be null.

The list of columns constrained by the UniqueConstraint is stored by column name.


Field Summary
static java.lang.String CONSTRAINT_TYPE
           
 
Fields inherited from class oracle.jdeveloper.cm.ds.db.Constraint
TYPE
 
Fields inherited from interface oracle.jdeveloper.cm.ds.db.DBObject
COMMENT
 
Fields inherited from interface oracle.ide.addin.Subject
OBJECT_MODIFIED
 
Constructor Summary
UniqueConstraint()
          Creates a new Constraint.
UniqueConstraint(java.lang.String name, Relation relation)
          Creates a new Constraint of the specified name on the specified relation.
 
Method Summary
 java.lang.Object copyTo(java.lang.Object target)
          Copies the state of this DBObject to another instance.
 boolean equals(java.lang.Object target)
           
 java.lang.String getConstraintType()
          Retrieves the type of constraint represented by this instance.
 
Methods inherited from class oracle.jdeveloper.cm.ds.db.ColumnConstraint
addColumn, copyToImpl, equalsImpl, getColumns, removeColumn, setColumns, setRelation
 
Methods inherited from class oracle.jdeveloper.cm.ds.db.Constraint
copyToImpl, equalsImpl, getRelation, getType, isEnabled, setEnabled
 
Methods inherited from class oracle.jdeveloper.cm.ds.db.AbstractDBObject
attach, compareToImpl, copyToImpl, detach, equalsImpl, getID, getName, getProperties, getProperty, hashCode, notifyObservers, setID, setName, setProperties, setProperty, toString
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

CONSTRAINT_TYPE

public static final java.lang.String CONSTRAINT_TYPE
See Also:
Constant Field Values
Constructor Detail

UniqueConstraint

public UniqueConstraint()
Creates a new Constraint.


UniqueConstraint

public UniqueConstraint(java.lang.String name,
                        Relation relation)
Creates a new Constraint of the specified name on the specified relation.

Parameters:
name - a string containing the name of the constraint
relation - the Relation being constrained
Method Detail

copyTo

public java.lang.Object copyTo(java.lang.Object target)
Description copied from interface: DBObject
Copies the state of this DBObject to another instance. If null is specified for the target, a new instance will be created.

The entire state of the object will be copied, with a few exceptions. In particular, any observers registered will NOT be copied. In cases where this instance contains child DBObjects, new instances of those children will be created, and the state copied to them. The copy will thus contain its own unique state; after making the copy, changing one instance will not cause any changes to occur to the copy. The properties will be copied; however, copies will not be made of the values referenced by the properties - thus, the copy will refer to the same instance as the original. Child objects that are copied will still point to the original parent; it is the responsibility of a copied parent to update the parent of copies of its children point to the copy of itself.

The ID associated with this object will not be copied. If the copy is intended to be a temporary copy of this object (to be used in a dialog editing the object for example), then the caller should explicitly set the ID of the copy to be the same as on this object. However, if the new object is intended to exist separately from this object, the caller should ensure that the new object have a different ID from this object.

Parameters:
target - The object to copy to. If target is null, a new instance will be created, and the state will be copied to that object.
Returns:
the copy.

equals

public boolean equals(java.lang.Object target)
Overrides:
equals in class AbstractDBObject

getConstraintType

public java.lang.String getConstraintType()
Description copied from class: Constraint
Retrieves the type of constraint represented by this instance. Valid constraint types can vary depending on the database. Examples of constraint types include primary key constraints, foreign key constraints, and check constraints.

Specified by:
getConstraintType in class Constraint
Returns:
a string value indicating the type of constraint.

Extension SDK

 

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