If this is the case, then can I do it in such a way that the second object does not load a collection of the first by default? There's no need to load all the cars and fruits a specific color is associated if all I want to do is load that color. (referring to my last example)
-Ron -----Original Message----- From: Werner Guttmann [mailto:[EMAIL PROTECTED] Sent: Monday, May 02, 2005 8:33 AM To: [email protected] Subject: AW: [castor-dev] many-to-many mapping.. Ronald, Castor unfortunately will require you to define the reverse leg of the many-to-many relation as well, even if you don't need from within your application. Without both legs, this will not work. And that's exactly the reason why you are seeing the keys not being set. Regards Werner wg> -----Urspr�ngliche Nachricht----- wg> Von: Ronald Rudy [mailto:[EMAIL PROTECTED] wg> Gesendet: Montag, 02. Mai 2005 14:23 wg> An: [email protected] wg> Betreff: RE: [castor-dev] many-to-many mapping.. wg> wg> wg> Here is my mapping: wg> wg> <class name="com.xyz.ObjectOne" identity="oneId" wg> key-generator="SEQUENCE"> wg> <description>"First of Many-to-Many Object"</description> wg> <map-to table="object_one"/> wg> <cache-type type="none"/> wg> <field name="oneId" type="integer"> wg> <sql name="object_one_id" type="integer"/> wg> </field> wg> wg> ... wg> wg> <field name="objectTwo" type="com.xyz.ObjectTwo" wg> collection="arraylist"> wg> <sql name="object_two_id" wg> many-table="objectone_objecttwo_map" wg> many-key="object_one_id" key-generator="SEQUENCE" /> wg> </field> wg> </class> wg> wg> wg> <class name="com.xyz.ObjectTwo" identity="twoId" wg> key-generator="SEQUENCE"> wg> <description>"Second of Many-to-Many Object"</description> wg> <map-to table="object_two"/> wg> <cache-type type="none"/> wg> <field name="twoId" type="integer"> wg> <sql name="object_two_id" type="integer"/> wg> </field> wg> wg> ... wg> wg> </class> wg> wg> wg> I didn't include a reverse mapping from the ObjectTwo -> wg> ObjectOne because I wg> don't have/need a property on the com.xyz.ObjectTwo class wg> to get back to wg> ObjectOne. wg> wg> The mapping table objectone_objecttwo_map has three relevant fields: wg> wg> primary key of the mapping table itself wg> foreign key of 'object_one' record this is associated with wg> foreign key of 'object_two' record this is associated with wg> wg> -Ron wg> wg> -----Original Message----- wg> From: Werner Guttmann [mailto:[EMAIL PROTECTED] wg> Sent: Monday, May 02, 2005 8:12 AM wg> To: [email protected] wg> Subject: AW: [castor-dev] many-to-many mapping.. wg> wg> wg> Ronald, wg> wg> there's no need to define a mapping object, as your wg> many-to-may relation wg> will be handled automatically by Castor. And this should by wg> definition wg> include the handling of the keys in the mapping table. It wg> looks like you wg> have got the mapping slightly wrong, so can you please post wg> the relevant wg> mapping section, the DDL used to create the tables in wg> question and some wg> information about the classes engaging in such mapping ? wg> wg> Werner wg> wg> -----Urspr�ngliche Nachricht----- wg> Von: Ronald Rudy [mailto:[EMAIL PROTECTED] wg> Gesendet: Montag, 02. Mai 2005 14:08 wg> An: [email protected] wg> Betreff: [castor-dev] many-to-many mapping.. wg> wg> wg> I have configured Castor to support a many-to-many wg> relationship between two wg> types of objects, but I'm getting an error. This is wg> because the mapping wg> table itself (in Oracle) contains a primary key of its own, wg> and this is not wg> automatically assigned by Castor. So when a new wg> relationship is created, wg> this primary key is null and the database throws an error. wg> wg> I don't have control over the database schema - is there any way to wg> configure Castor to recognize that the configured wg> many-table has a primary wg> key and the key can be created using the sequence key wg> generator? (the wg> sequence key generator works fine for everything else) Or wg> am I going to be wg> forced to create a "map" object that handles the wg> relationship 'manually'? wg> wg> -Ron wg> wg>
