api/1.1.3/javax/persistence/MappedSuperclass.html - gerrit/www.eclipse.org/eclipselink - Git at Google

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 <H2>
 <FONT SIZE="-1">
 javax.persistence</FONT>
 <BR>
 Annotation Type MappedSuperclass</H2>
 <HR>
 <DL>
 <DT><PRE><FONT SIZE="-1">@Target(value=TYPE)
 @Retention(value=RUNTIME)
 </FONT>public @interface <B>MappedSuperclass</B></DL>
 </PRE>

 <P>
 Designates a class whose mapping information is applied
  to the entities that inherit from it. A mapped superclass
  has no separate table defined for it.

  <p> A class designated with the <code>MappedSuperclass</code>
  annotation can be mapped in the same way as an entity except that the
  mappings will apply only to its subclasses since no table
  exists for the mapped superclass itself. When applied to the
  subclasses the inherited mappings will apply in the context
  of the subclass tables. Mapping information may be overridden
  in such subclasses by using the <A HREF="../../javax/persistence/AttributeOverride.html" title="annotation in javax.persistence"><CODE>AttributeOverride</CODE></A> and
  <A HREF="../../javax/persistence/AssociationOverride.html" title="annotation in javax.persistence"><CODE>AssociationOverride</CODE></A> annotations or corresponding XML elements.

  <pre>
     Example: Concrete class as a mapped superclass

     &#064;MappedSuperclass
     public class Employee {

         &#064;Id protected Integer empId;
         &#064;Version protected Integer version;
         &#064;ManyToOne &#064;JoinColumn(name="ADDR")
         protected Address address;

         public Integer getEmpId() { ... }
         public void setEmpId(Integer id) { ... }
         public Address getAddress() { ... }
         public void setAddress(Address addr) { ... }
     }

     // Default table is FTEMPLOYEE table
     &#064;Entity
     public class FTEmployee extends Employee {

         // Inherited empId field mapped to FTEMPLOYEE.EMPID
         // Inherited version field mapped to FTEMPLOYEE.VERSION
         // Inherited address field mapped to FTEMPLOYEE.ADDR fk


     // Defaults to FTEMPLOYEE.SALARY

     protected Integer salary;


     public FTEmployee() {}


     public Integer getSalary() { ... }

     public void setSalary(Integer salary) { ... }
     }

     &#064;Entity &#064;Table(name="PT_EMP")
     &#064;AssociationOverride(name="address",


     joincolumns=&#064;JoinColumn(name="ADDR_ID"))
     public class PartTimeEmployee extends Employee {

         // Inherited empId field mapped to PT_EMP.EMPID
         // Inherited version field mapped to PT_EMP.VERSION
         // address field mapping overridden to PT_EMP.ADDR_ID fk
         &#064;Column(name="WAGE")
         protected Float hourlyWage;

         public PartTimeEmployee() {}

         public Float getHourlyWage() { ... }
         public void setHourlyWage(Float wage) { ... }
     }

     Example: Non-entity superclass

     public class Cart {

         // This state is transient
         Integer operationCount;

         public Cart() { operationCount = 0; }
         public Integer getOperationCount() { return operationCount; }
         public void incrementOperationCount() { operationCount++; }
     }

     &#064Entity
     public class ShoppingCart extends Cart {

         Collection<Item> items = new Vector<Item>();

         public ShoppingCart() { super(); }


     ...

         &#064OneToMany
         public Collection<Item> getItems() { return items; }
         public void addItem(Item item) {
             items.add(item);
             incrementOperationCount();
         }
     }
  </pre>
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 <P>
 <DL>
 <DT><B>Since:</B></DT>
   <DD>Java Persistence 1.0</DD>
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	<H2>
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	javax.persistence</FONT>
	<BR>
	Annotation Type MappedSuperclass</H2>
	<HR>
	<DL>
	<DT><PRE><FONT SIZE="-1">@Target(value=TYPE)
	@Retention(value=RUNTIME)
	</FONT>public @interface <B>MappedSuperclass</B></DL>
	</PRE>

	<P>
	Designates a class whose mapping information is applied
	to the entities that inherit from it. A mapped superclass
	has no separate table defined for it.

	<p> A class designated with the <code>MappedSuperclass</code>
	annotation can be mapped in the same way as an entity except that the
	mappings will apply only to its subclasses since no table
	exists for the mapped superclass itself. When applied to the
	subclasses the inherited mappings will apply in the context
	of the subclass tables. Mapping information may be overridden
	in such subclasses by using the <A HREF="../../javax/persistence/AttributeOverride.html" title="annotation in javax.persistence"><CODE>AttributeOverride</CODE></A> and
	<A HREF="../../javax/persistence/AssociationOverride.html" title="annotation in javax.persistence"><CODE>AssociationOverride</CODE></A> annotations or corresponding XML elements.

	<pre>
	Example: Concrete class as a mapped superclass

	@MappedSuperclass
	public class Employee {

	@Id protected Integer empId;
	@Version protected Integer version;
	@ManyToOne @JoinColumn(name="ADDR")
	protected Address address;

	public Integer getEmpId() { ... }
	public void setEmpId(Integer id) { ... }
	public Address getAddress() { ... }
	public void setAddress(Address addr) { ... }
	}

	// Default table is FTEMPLOYEE table
	@Entity
	public class FTEmployee extends Employee {

	// Inherited empId field mapped to FTEMPLOYEE.EMPID
	// Inherited version field mapped to FTEMPLOYEE.VERSION
	// Inherited address field mapped to FTEMPLOYEE.ADDR fk


	// Defaults to FTEMPLOYEE.SALARY

	protected Integer salary;


	public FTEmployee() {}


	public Integer getSalary() { ... }

	public void setSalary(Integer salary) { ... }
	}

	@Entity @Table(name="PT_EMP")
	@AssociationOverride(name="address",


	joincolumns=@JoinColumn(name="ADDR_ID"))
	public class PartTimeEmployee extends Employee {

	// Inherited empId field mapped to PT_EMP.EMPID
	// Inherited version field mapped to PT_EMP.VERSION
	// address field mapping overridden to PT_EMP.ADDR_ID fk
	@Column(name="WAGE")
	protected Float hourlyWage;

	public PartTimeEmployee() {}

	public Float getHourlyWage() { ... }
	public void setHourlyWage(Float wage) { ... }
	}

	Example: Non-entity superclass

	public class Cart {

	// This state is transient
	Integer operationCount;

	public Cart() { operationCount = 0; }
	public Integer getOperationCount() { return operationCount; }
	public void incrementOperationCount() { operationCount++; }
	}

	&#064Entity
	public class ShoppingCart extends Cart {

	Collection<Item> items = new Vector<Item>();

	public ShoppingCart() { super(); }


	...

	&#064OneToMany
	public Collection<Item> getItems() { return items; }
	public void addItem(Item item) {
	items.add(item);
	incrementOperationCount();
	}
	}
	</pre>
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	<P>
	<DL>
	<DT><B>Since:</B></DT>
	<DD>Java Persistence 1.0</DD>
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