Re: one-to-many problem

From: Andrus Adamchik (andru..bjectstyle.org)
Date: Fri May 16 2008 - 11:33:05 EDT

  • Next message: Scott Anderson: "RE: one-to-many problem"

    Sorry I didn't have a chance to investigate this more deeply. I think
    you can also tag both columns as a compound PK.

    Andrus

    On May 16, 2008, at 11:28 AM, Scott Anderson wrote:

    > I was able to work around this by removing command.id from the model
    > and
    > changing command.name to the PK. This seems to work transparently,
    > since
    > the id column is auto-generated by the DB in the existing schema.
    >
    > In any case, it sounds like a bug to me. I definitely can't think of
    > any
    > reason why the way I had it shouldn't work.
    >
    > -----Original Message-----
    > From: Scott Anderson [mailto:sanderso..irvana.com]
    > Sent: Monday, May 12, 2008 6:25 PM
    > To: use..ayenne.apache.org
    > Subject: one-to-many problem
    >
    > I've got a table `command which has:
    > `id` int PK
    > `name` varchar(32) UNIQUE
    >
    > and a table `command_alias` which has
    > `alias` varchar(32) PK
    > `name` varchar(32) FK REF `command`.`name`
    >
    > Take special note how `command_alias`.`name` is a FK to
    > `command`.`name`
    > (unique field) and not `command`.`id` (the PK)
    >
    > The following code chokes:
    > public static CommandAlias create(Command command, String alias)
    > {
    > CommandAlias ca =
    > DatabaseContext.getContext().newObject(CommandAlias.class);
    > ca.setAlias(alias);
    > ca.setToCommand(command);
    > command.addToAliases(ca);
    > try {
    > ca.updateRow();
    > return ca;
    > } catch(Exception e) {
    > Out.exception(e);
    > return null;
    > }
    > }
    >
    > With the error:
    >
    > May 12, 2008 6:15:55 PM org.apache.cayenne.access.QueryLogger logQuery
    > INFO: INSERT INTO command_alias (alias, name) VALUES (?, ?)
    > INFO: [batch bind: 1->alias:'aa', 2->name:NULL]
    > May 12, 2008 6:15:55 PM org.apache.cayenne.access.QueryLogger
    > logQueryError
    > INFO: *** error.
    > java.sql.SQLIntegrityConstraintViolationException: Column 'NAME'
    > cannot
    > accept a NULL value.
    >
    >
    > I am 100% sure that I am not sending a null Command object. I believe
    > this stems from the fact that the relationship is not a FK-PK
    > relationship, but a FK-UNIQUE relationship, as evidenced by the fact
    > that if I make the `command_alias`.`name` field visible in the code,
    > and
    > set do ca.setName(command.getName()) then this error does not occur.
    >
    > I am using a 3.0 snapshot from March.
    >
    >
    > And here's the relevant sections of my mapping file (I removed some
    > unrelated fields from command):
    >
    > <db-entity name="command">
    > <db-attribute name="id" type="INTEGER"
    > isPrimaryKey="true" isGenerated="true" isMandatory="true"
    > length="11"/>
    > <db-attribute name="name" type="VARCHAR"
    > isMandatory="true" length="32"/>
    > </db-entity>
    > <db-entity name="command_alias">
    > <db-attribute name="alias" type="VARCHAR"
    > isPrimaryKey="true" isMandatory="true" length="32"/>
    > <db-attribute name="name" type="VARCHAR" length="32"/>
    > </db-entity>
    > <obj-entity name="Command" className="net.bnubot.db.Command"
    > dbEntityName="command"
    > superClassName="net.bnubot.db.CustomDataObject">
    > <obj-attribute name="name" type="java.lang.String"
    > db-attribute-path="name"/>
    > </obj-entity>
    > <obj-entity name="CommandAlias"
    > className="net.bnubot.db.CommandAlias" dbEntityName="command_alias"
    > superClassName="net.bnubot.db.CustomDataObject">
    > <obj-attribute name="alias" type="java.lang.String"
    > db-attribute-path="alias"/>
    > </obj-entity>
    > <db-relationship name="commandAliasArray" source="command"
    > target="command_alias" toMany="true">
    > <db-attribute-pair source="name" target="name"/>
    > </db-relationship>
    > <db-relationship name="toCommand" source="command_alias"
    > target="command" toMany="false">
    > <db-attribute-pair source="name" target="name"/>
    > </db-relationship>
    > <obj-relationship name="aliases" source="Command"
    > target="CommandAlias" deleteRule="Deny"
    > db-relationship-path="commandAliasArray"/>
    > <obj-relationship name="toCommand" source="CommandAlias"
    > target="Command" db-relationship-path="toCommand"/>
    >



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