 2 | .GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence ... ;
public class ObjectDbRemoveTest {
@Entity
public static class ParentEntity {
@Id
@GeneratedValue
private long id;
@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy |
2 | ());
}
@Entity
public static class MyEntity {
@Id @GeneratedValue(strategy = GenerationType.AUTO)
private long id;
String myname = "Roger";
java.sql.Time mytime ...
public String toString() {
return "MyEntity{" + "id=" + id + ", myname=" + myname |
2 | javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne ...
public static class ParentEntity {
@Id
@GeneratedValue
private long id;
@OneToMany(fetch ... );
}
public long getId() {
return id;
}
public void setId(long id) {
this.id |
2 | how we detect the existing EntityB instances they must be converted to the new Entity. With the same ID, because it's possible that many other entities have just a ID based reference with a simple 'int' field to this element. And we thought that also the real references are based on the ID. This step |
2 | Chart implements Serializable {
private TimePeriod id;
private List points ... TimePeriod getId() {
return id;
}
public void setId(TimePeriod id) {
this.id = id;
}
@OneToMany(cascade=javax.persistence.CascadeType.ALL,fetch=javax |
2 | understand that making a query just on entity.id.field1 is efficient. Of course, making a query ... is: what about making a query just on entity.id.field2? I suppose it will not be an efficient query, because all database entries have to be checked. My assumption is based on the fact that entity.id |
2 | :
@Entity
public class Request
{
public Request() { }
@Id @GeneratedValue(strategy=GenerationType.IDENTITY)
private Long id;
@Unique
@Persistent(nullValue=NullValue.EXCEPTION)
private String username;
public Long getId() { return id; }
public void setId(Long id) { this.id |
2 | with such a simple query:
select prod from Product prod order by prod.id ASC Right now I have 55541 ... .createQuery("select prod from Product prod order by prod.id ASC", Product.class);
prodList = icQuery ... Product prod order by prod.id ASC]
2011-11-15 19:30:59.578 [http-bio-8080-exec-3] DEBUG pl.hplxtool.dao |
2 | , <id>) much faster than an equivalent query. To optimize the Performance we define a special Entity (A) with additional data that use an existing ID of another Entity (B) from another class ... (B) we check if an Entity (A) with the ID of Entity (B) exist. If it exist we put the date |
2 | owningCompany;
}
@Entity()
public class Company{
.
.
.
@Id
private Long id ... ) {
mLogger.info("Fetching type: {} with id {} with company: {}", new Object[]{managedClass, primaryKey ... .equal(p.get("id"), primaryKey),
qb.and(qb.equal(p.get("owningCompany"), company |
