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| <H2> |
| <FONT SIZE="-1"> |
| javax.persistence</FONT> |
| <BR> |
| Annotation Type MapKey</H2> |
| <HR> |
| <DL> |
| <DT><PRE><FONT SIZE="-1">@Target(value={METHOD,FIELD}) |
| @Retention(value=RUNTIME) |
| </FONT>public @interface <B>MapKey</B></DL> |
| </PRE> |
| |
| <P> |
| Is used to specify the map key for associations of type |
| <CODE>Map</CODE>. |
| |
| <p> If a persistent field or property other than the primary |
| key is used as a map key then it is expected to have a |
| uniqueness constraint associated with it. |
| |
| <pre> |
| |
| Example 1: |
| |
| @Entity |
| public class Department { |
| ... |
| @OneToMany(mappedBy="department") |
| @MapKey(name="empId") |
| public Map<Integer, Employee> getEmployees() {... } |
| ... |
| } |
| |
| @Entity |
| public class Employee { |
| ... |
| @Id Integer getEmpid() { ... } |
| @ManyToOne |
| @JoinColumn(name="dept_id") |
| public Department getDepartment() { ... } |
| ... |
| } |
| |
| Example 2: |
| |
| @Entity |
| public class Department { |
| ... |
| @OneToMany(mappedBy="department") |
| @MapKey(name="empPK") |
| public Map<EmployeePK, Employee> getEmployees() {... } |
| ... |
| } |
| |
| @Entity |
| public class Employee { |
| @EmbeddedId public EmployeePK getEmpPK() { ... } |
| ... |
| @ManyToOne |
| @JoinColumn(name="dept_id") |
| public Department getDepartment() { ... } |
| ... |
| } |
| |
| @Embeddable |
| public class EmployeePK { |
| String name; |
| Date bday; |
| } |
| </pre> |
| <P> |
| |
| <P> |
| <DL> |
| <DT><B>Since:</B></DT> |
| <DD>Java Persistence 1.0</DD> |
| </DL> |
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| <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
| <B>Optional Element Summary</B></FONT></TH> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> java.lang.String</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/persistence/MapKey.html#name()">name</A></B></CODE> |
| |
| <BR> |
| The name of the persistent field or property of the |
| associated entity that is used as the map key.</TD> |
| </TR> |
| </TABLE> |
| |
| <P> |
| <A NAME="name()"><!-- --></A><H3> |
| name</H3> |
| <PRE> |
| public abstract java.lang.String <B>name</B></PRE> |
| <DL> |
| <DD>The name of the persistent field or property of the |
| associated entity that is used as the map key. If the |
| name element is not specified, the primary key of the |
| associated entity is used as the map key. If the |
| primary key is a composite primary key and is mapped |
| as <A HREF="../../javax/persistence/IdClass.html" title="annotation in javax.persistence"><CODE>IdClass</CODE></A>, an instance of the primary key |
| class is used as the key. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| <DL> |
| <DT><B>Default:</B><DD>""</DD> |
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