?
Solved

Using Date type in an EJB Query Language

Posted on 2008-10-07
1
Medium Priority
?
1,839 Views
Last Modified: 2013-12-14
I am developing an application in NetBeans thats uses the built in database server (apache derby), i've used the IDE to generate entity classes refelecting tables in my database. The IDE has also created a persistance unit and an entity manager, i am trying to run an EJB Query on a table in the database but i am having some syntactical difficulties which i am having trouble resolving.

This is the EJB QL:

SELECT m FROM Measurement m WHERE m.measurementDateofbooking = '07.10.2008'

This is the Measurement Table Structure in the database:

MEASUREMENT                             Data Type
=====================================
measurement_id                           Auto Gen Int PK
measurement_customer_id          Int FK
measurement_dateofbooking       Date
measurement_timeofbooking       Time
measurement_completed             Char

This is a relevant snippet of the measurement Entity Class: (See Code Snippet)

This is the exception i recieve:

Exception Description: The object [07.10.2008], of class [class java.lang.String], from mapping [oracle.toplink.essentials.mappings.DirectToFieldMapping[measurementDateofbooking-->MEASUREMENT."measurement_dateofbooking"]] with descriptor [RelationalDescriptor(mk_carpets_alpha_entity_classes.Measurement --> [DatabaseTable(MEASUREMENT)])], could not be converted to [class java.sql.Date].

Exception in thread "AWT-EventQueue-0" Local Exception Stack:

Exception [TOPLINK-3002] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.ConversionException

Exception Description: The object [07.10.2008], of class [class java.lang.String], from mapping [oracle.toplink.essentials.mappings.DirectToFieldMapping[measurementDateofbooking-->MEASUREMENT."measurement_dateofbooking"]] with descriptor [RelationalDescriptor(mk_carpets_alpha_entity_classes.Measurement --> [DatabaseTable(MEASUREMENT)])], could not be converted to [class java.sql.Date].

        at oracle.toplink.essentials.exceptions.ConversionException.incorrectDateFormat(ConversionException.java:119)
        at oracle.toplink.essentials.internal.helper.Helper.dateFromString(Helper.java:747)


After looking at the exception i thought it might be the format of the date, but i tried the same date in the database sql command ('07.10.2008') and it retrieved the results fine. I even tried changing my EJB Q to this: SELECT m FROM Measurement m WHERE m.measurementDateofbooking = new Date(2008,10,7)
and it still didnt work.
package mk_carpets_alpha_entity_classes;
 
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Transient;
 
/**
 *
 * @author ______
 */
@Entity
@Table(name = "MEASUREMENT")
@NamedQueries({@NamedQuery(name = "Measurement.findByMeasurementId", query = "SELECT m FROM Measurement m WHERE m.measurementId = :measurementId"), @NamedQuery(name = "Measurement.findByMeasurementDateofbooking", query = "SELECT m FROM Measurement m WHERE m.measurementDateofbooking = :measurementDateofbooking"), @NamedQuery(name = "Measurement.findByMeasurementTimeofbooking", query = "SELECT m FROM Measurement m WHERE m.measurementTimeofbooking = :measurementTimeofbooking"), @NamedQuery(name = "Measurement.findByMeasurementCompleted", query = "SELECT m FROM Measurement m WHERE m.measurementCompleted = :measurementCompleted")})
public class Measurement implements Serializable {
    @Transient
    private PropertyChangeSupport changeSupport = new PropertyChangeSupport(this);
    private static final long serialVersionUID = 1L;
    @Id
    @Column(name = "\"measurement_id\"", nullable = false)
    private Integer measurementId;
    @Column(name = "\"measurement_dateofbooking\"", nullable = false)
    @Temporal(TemporalType.DATE)
    private Date measurementDateofbooking;
    @Column(name = "\"measurement_timeofbooking\"", nullable = false)
    @Temporal(TemporalType.TIME)
    private Date measurementTimeofbooking;
    @Column(name = "\"measurement_completed\"")
    private Character measurementCompleted;
    @JoinColumn(name = "\"measurement_customer_id\"", referencedColumnName = "\"customer_id\"")
    @ManyToOne
    private Customer measurementCustomerId;

Open in new window

0
Comment
Question by:awax187
1 Comment
 

Accepted Solution

by:
awax187 earned 0 total points
ID: 22663974
ok never mind ive solved the problem. The date in the EJB Query should have been in the format, 'yyyy-mm-dd' i was writing it in the wrong form. Hope somebody finds this useful.
0

Featured Post

Vote for the Most Valuable Expert

It’s time to recognize experts that go above and beyond with helpful solutions and engagement on site. Choose from the top experts in the Hall of Fame or on the right rail of your favorite topic page. Look for the blue “Nominate” button on their profile to vote.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Microsoft Access is a place to store data within tables and represent this stored data using multiple database objects such as in form of macros, forms, reports, etc. After a MS Access database is created there is need to improve the performance and…
Instead of error trapping or hard-coding for non-updateable fields when using QODBC, let VBA automatically disable them when forms open. This way, users can view but not change the data. Part 1 explained how to use schema tables to do this. Part 2 h…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …
Suggested Courses

862 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question