c# create and print barcode The complete Hibernate mapping catalog in Java

Creation Quick Response Code in Java The complete Hibernate mapping catalog

APPENDIX
QR Code 2d Barcode Printer In Java
Using Barcode drawer for Java Control to generate, create QR Code ISO/IEC18004 image in Java applications.
www.OnBarcode.com
Decode QR Code JIS X 0510 In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
The complete Hibernate mapping catalog
Barcode Maker In Java
Using Barcode creation for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
GTIN - 13 Drawer In Java
Using Barcode creation for Java Control to generate, create UPC - 13 image in Java applications.
www.OnBarcode.com
} } public class Room implements Serializable { private Long id; public boolean equals(Object o) { if (this == o) return true; if (!(o instanceof Room)) return false; final Room room = (Room) o; if (id != null !id.equals(room.id) : room.id != null) { return false; } return true; } public int hashCode() { return (id != null id.hashCode() : 0); } }
Print Code128 In Java
Using Barcode generator for Java Control to generate, create Code 128A image in Java applications.
www.OnBarcode.com
Printing Code 128B In Java
Using Barcode encoder for Java Control to generate, create Code 128C image in Java applications.
www.OnBarcode.com
Here you ve implemented the two necessary methods on Room so that you can use it as a key in your map. In addition, to specify a Room object as a key, you ve used a new tag, @hibernate.index-many-to-many. Notice that it breaks somewhat with the XDoclet naming convention; it should have probably been called @hibernate-collection-indexmany-to-many, but that s a mouthful. The resulting Event.hbm.xml file looks like this:
QR Code Creator In Java
Using Barcode maker for Java Control to generate, create QR Code 2d barcode image in Java applications.
www.OnBarcode.com
Painting ISSN In Java
Using Barcode drawer for Java Control to generate, create International Standard Serial Number image in Java applications.
www.OnBarcode.com
<class name="com.manning.hq.apdxA.Event" table="events"> <map name="speakersByRoom" table="as_event_to_speakers_by_room"> <key column="event_id"/> <index-many-to-many class="com.manning.hq.apdxA.Room" column="room_id" /> <many-to-many class="com.manning.hq.apdxA.Speaker" column="speaker_id" /> </map> </class>
Denso QR Bar Code Printer In C#.NET
Using Barcode creation for VS .NET Control to generate, create QR Code image in VS .NET applications.
www.OnBarcode.com
Create QR Code JIS X 0510 In None
Using Barcode maker for Font Control to generate, create QR image in Font applications.
www.OnBarcode.com
That s how you define this relationship, which is a pretty complicated one. You might never need a relationship this rich in your object
UPCA Creator In VB.NET
Using Barcode maker for .NET framework Control to generate, create UPC-A Supplement 2 image in .NET framework applications.
www.OnBarcode.com
Barcode Creator In None
Using Barcode creator for Software Control to generate, create Barcode image in Software applications.
www.OnBarcode.com
Maps
Code 128C Recognizer In Visual Basic .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
PDF-417 2d Barcode Printer In .NET Framework
Using Barcode printer for .NET Control to generate, create PDF417 image in .NET applications.
www.OnBarcode.com
model, but it s nice to know it can be done, should you require it. To illustrate how you might populate it, here s a short code sample to show it in action:
Draw Barcode In Objective-C
Using Barcode maker for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Read EAN-13 Supplement 5 In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Event event = new Event(); Room room1 = new Room(); Room room2 = new Room(); Speaker speaker1 = new Speaker(); Speaker speaker2 = new Speaker(); session.save(event); session.save(room1); session.save(room2); session.save(speaker1); session.save(speaker2); event.getSpeakersByRoom().put(room1, speaker1); event.getSpeakersByRoom().put(room2, speaker2); session1.flush();
Printing Universal Product Code Version A In None
Using Barcode encoder for Online Control to generate, create Universal Product Code version A image in Online applications.
www.OnBarcode.com
Barcode Reader In .NET Framework
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
You ve created an event, a few rooms, and a few speakers. Then save all of them, which is important especially for the Room objects, so they won t have null ids. Next you put the speakers into the map using the Rooms as keys.
Code 39 Full ASCII Reader In C#.NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Barcode Creator In None
Using Barcode maker for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Table schema
This fairly complicated relationship has three entity tables, with an association table that links the three together. The room is actually the unique map key for the collections of speakers.
as_event_to_speakers_by_room event_id speaker_id room_id rooms id
events id
speakers id
APPENDIX
The complete Hibernate mapping catalog
A.8.5 Other maps
Maps offer the most variety of association possibilities, not all of which we can cover here. As long as you know they are possible, it should be fairly easy to mix and match the collection tags/elements you ve seen so far to build the association you want. Here s a list of other relationships that are possible but that we don t have space to cover:
Maps with component keys and entity values (one-to-many or many-to-many) Maps with entity keys and component values Maps with entity keys and simple values Maps with simple keys and simple values
A.9 Arrays
Hibernate supports the use of arrays to store entities, components, and simple values. The two elements that it uses are <array> and <primitive-array>, the latter used only if non-object simple values are being stored (like int, long, or boolean).
A.9.1 Entity arrays
Suppose your Event had several speakers, featured as part of a roundtable discussion panel. You might store them as an Array on the Event class, in a one-to-many relationship, as shown in figure A.10.
Event
Speaker
Figure A.10 One-to-many array: Event to Speaker
The Event class looks like this:
public class Event implements Serializable { private Speaker[] featuredSpeakers = new Speaker[0];
Arrays
/** * @hibernate.array * @hibernate.collection-key column="event_id_featured" * @hibernate.collection-index column="featured_speaker_order" * @hibernate.collection-one-to-many * class="com.manning.hq.apdxA.Speaker" */ public Speaker[] getFeaturedSpeakers() { return featuredSpeakers; } public void setFeaturedSpeakers(Speaker[] featuredSpeakers) { this.featuredSpeakers = featuredSpeakers; } }
Unfortunately you still need to specify the class on the @hibernate.collection-one-to-many tag, because XDoclet doesn t attempt to guess (even though it probably could from the return type):
<class name="com.manning.hq.apdxA.Event" table="events"> <array name="featuredSpeakers"> <key column="event_id_featured"/> <index column="featured_speaker_order" /> <one-to-many class="com.manning.hq.apdxA.Speaker" /> </array> </class>
Table schema
Arrays of entities and lists of entities are pretty much identical in usage and database schemas. There is a foreign key back to the parent table and a column that maintains the order.
Copyright © OnBarcode.com . All rights reserved.