Update single field using spring data jpa
JavaSpringSpring DataUpdatesSpring Data-JpaJava Problem Overview
I'm using spring-data's repositories - very convenient thing but I faced an issue. I easily can update whole entity but I believe it's pointless when I need to update only a single field:
@Entity
@Table(schema = "processors", name = "ear_attachment")
public class EARAttachment {
private Long id;
private String originalName;
private String uniqueName;//yyyy-mm-dd-GUID-originalName
private long size;
private EARAttachmentStatus status;
to update I just call method save. In log I see the followwing:
batching 1 statements: 1: update processors.ear_attachment set message_id=100,
original_name='40022530424.dat',
size=506,
status=2,
unique_name='2014-12-16-8cf74a74-e7f3-40d8-a1fb-393c2a806847-40022530424.dat'
where id=1
I would like to see some thing like this:
batching 1 statements: 1: update processors.ear_attachment set status=2 where id=1
Spring's repositories have a lot of facilities to select something using name conventions, maybe there is something similar for update like updateForStatus(int status);
Java Solutions
Solution 1 - Java
You can try something like this on your repository interface:
@Modifying
@Query("update EARAttachment ear set ear.status = ?1 where ear.id = ?2")
int setStatusForEARAttachment(Integer status, Long id);
You can also use named params, like this:
@Modifying
@Query("update EARAttachment ear set ear.status = :status where ear.id = :id")
int setStatusForEARAttachment(@Param("status") Integer status, @Param("id") Long id);
The int return value is the number of rows that where updated. You may also use void
return.
See more in reference documentation.
Solution 2 - Java
Hibernate offers the @DynamicUpdate annotation. All we need to do is to add this annotation at the entity level:
@Entity(name = "EARAttachment ")
@Table(name = "EARAttachment ")
@DynamicUpdate
public class EARAttachment {
//Code omitted for brevity
}
Now, when you use EARAttachment.setStatus(value)
and executing "CrudRepository" save(S entity)
, it will update only the particular field. e.g. the following UPDATE statement is executed:
UPDATE EARAttachment
SET status = 12,
WHERE id = 1
Solution 3 - Java
You can update use databind to map @PathVariable T entity and @RequestBody Map
public static void applyChanges(Object entity, Map<String, Object> map, String[] ignoreFields) {
map.forEach((key, value) -> {
if(!Arrays.asList(ignoreFields).contains(key)) {
try {
Method getMethod = entity.getClass().getMethod(getMethodNameByPrefix("get", key));
Method setMethod = entity.getClass().getMethod(getMethodNameByPrefix("set", key), getMethod.getReturnType());
setMethod.invoke(entity, value);
} catch (IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
e.printStackTrace();
}
}
});
}