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Difference between revisions of "EclipseLink/Examples/JPA/PessimisticLocking"
< EclipseLink | Examples | JPA
(→Via XML) |
(→Via XML) |
||
| Line 25: | Line 25: | ||
... | ... | ||
<named-query name="findAllEmployeesByFirstName"> | <named-query name="findAllEmployeesByFirstName"> | ||
| − | <query>SELECT OBJECT(employee) FROM Employee employee WHERE employee. | + | <query>SELECT OBJECT(employee) FROM Employee employee WHERE employee.id = :id</query> |
<hint name="eclipselink.pessimistic-lock" value="eclipselink.pessimistic-lock"> | <hint name="eclipselink.pessimistic-lock" value="eclipselink.pessimistic-lock"> | ||
</named-query> | </named-query> | ||
Revision as of 16:06, 15 October 2007
EclipseLink allows users the option of using pessimistic locking on their queries. This is done through the use of a query hint.
Via Annotations
@Entity
@Table(name="JPA_EMPLOYEE")
@NamedQuery(
name="findEmployeeByPK",
query="SELECT OBJECT(employee) FROM Employee employee WHERE employee.id = :id"),
hints={
@QueryHint(
name=EclipseLinkQueryHints.PESSIMISTIC_LOCK,
value=EclipseLinkQueryHints.PESSIMISTIC_LOCK)
}
)
public class Employee implements Serializable {
...
}
Via XML
<entity name="Employee" class="org.eclipse.testing.Employee" access="PROPERTY">
...
<named-query name="findAllEmployeesByFirstName">
<query>SELECT OBJECT(employee) FROM Employee employee WHERE employee.id = :id</query>
<hint name="eclipselink.pessimistic-lock" value="eclipselink.pessimistic-lock">
</named-query>
...
</entity>