From: Jonathan de H. <deh...@au...> - 2004-04-25 19:29:31
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When you can a foreign-key, sqlpp adds all the primary-key fields to the linked table without altering the names. Now this approach does not work if you link "twice" the same table or you are doing a self-reference. In that case, you can use reference/@field-prefix to tag the name of the added fields. For example, field-prefix="Parent" will lead to field: ParentUserID and so on. In your case: <reference id="ref_myBoss" ref-table="users" field-prefix="Parent" nullable="true" /> At 14:41 24/04/2004 +0200, you wrote: >Hi! >Can I implement a reference from a foreign key to a primary key field >in the same table? >I try the something like this: ><table id="users" name="Users" field-prefix="User" qualifier="test_" >fixed="false" signed="false" suffix=""> > <field id="userid" name="ID" type="int" primary-key="true" /> > <!-- <field id="bossid" name="bossID" type="int" /> --> > <field id="username" name="Name" type="NVARCHAR(30)" > nullable="false" /> > <field id="userlastname" name="LastName" type="NVARCHAR(30)" > nullable="true" /> > <reference id="ref_myBoss" ref-table="users" field-prefix="" > nullable="false" match="userid" name="bossid" /> > <!-- <reference id="ref_myBoss" ref-table="users" > field-prefix="" nullable="false" name="bossid"/> --> ></table> >but I get error that a "duplicate field name while creating foreign keys" >was found. >Could you help me? > >What make the match and name attribute in reference-type tag exactly? > >Thank you! > > >------------------------------------------------------- >This SF.net email is sponsored by: The Robotic Monkeys at ThinkGeek >For a limited time only, get FREE Ground shipping on all orders of $35 >or more. Hurry up and shop folks, this offer expires April 30th! >http://www.thinkgeek.com/freeshipping/?cpg=12297 >_______________________________________________ >Sqlpp-devel mailing list >Sql...@li... >https://lists.sourceforge.net/lists/listinfo/sqlpp-devel ----------------------------------------------------------------------------------- Jonathan de Halleux, Research Assistant Center for Systems Engineering and Applied Mechanics (CESAME) Universite catholique de Louvain Batiment Euler , Av. Georges Lemaitre, 4 Tel : +32-10-47 2595 B-1348 Louvain-la-Neuve Belgium E-mail : deh...@au... ----------------------------------------------------------------------------------- |