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Re: many-to-many query question
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Re: many-to-many query question


On Oct 26, 2007, at 11:32 AM, James Cicenia wrote:

Well actually I didn't.. I just brought in the source and compiled it.

And you expected it to work? :-) See com.houdah.webobjects.eoaccess.PrincipalClass for why it does not.


By the way I also tried Lachlan's version and that didn't seem to generate a real IN or CONTAINS clause in the sql
so the it always returns 0 rows.

Here is the generated sql:

I would not be surprised to see that that in many (most?) cases QualifierOperatorContains does not generate correct SQL for complex queries for to-many relationships.

Chuck


FROM portfolio_project t0, portfolio_metric_list_portfolio_project T1
WHERE
(
(
(T1.portfolio_metric_id = ? OR T1.portfolio_metric_id = ?) AND (T1.portfolio_metric_id = ? OR T1.portfolio_metric_id = ?)
)
AND
(t0.lifecycle_state <> ? AND (t0.lifecycle_state <> ? AND t0.portfolio_id = ?))
)
AND
t0.row_id = T1.portfolio_project_id


That first AND will always evaluate as false.

Thanks
James








On Oct 26, 2007, at 12:28 PM, Chuck Hill wrote:

Without information on how you are using it and the model, you leave us guessing.

Well, as I am left guessing, I guess that the framework is not getting initialized correctly. Did you add the framework like a normal WO framework?


Chuck


On Oct 26, 2007, at 7:16 AM, James Cicenia wrote:

Ok -

I tried the ExistsInRelationshipQualifier but I get this error:

(class com.houdah.webobjects.eocontrol.ExistsInRelationshipQualifier (does not implement EOQualifierSQLGeneration
at com.webobjects.eoaccess.EOQualifierSQLGeneration $Support._schemaBasedQualifierWithRootEntity (EOQualifierSQLGeneration.java:163)
at com.webobjects.eoaccess.EOQualifierSQLGeneration $_AndQualifierSupport.schemaBasedQualifierWithRootEntity (EOQualifierSQLGeneration.java:502)
at com.webobjects.eoaccess.EOQualifierSQLGeneration $Support._schemaBasedQualifierWithRootEntity (EOQualifierSQLGeneration.java:165)

Thanks
James


On Oct 25, 2007, at 9:47 PM, Chuck Hill wrote:


On Oct 25, 2007, at 6:29 PM, Lachlan Deck wrote:

On 26/10/2007, at 10:40 AM, James Cicenia wrote:

I have a many-to-many relationship as such:

Portfolio --->>MetricGroups--->>MetricItems<---- project_item---->Project

How I can create a query where

project can have ( Items(a) OR Items(b) ) AND (Items(c)) 

Something like this...

NSMutableArray itemsAQuals = new NSMutableArray();
String keyPathToA = "blah.blah";
for ( Item a : itemsA ) {
itemsAQuals.addObject( new EOKeyValueQualifier( keyPathToA, EOQualifier.QualifierOperatorContains, a ) );
}

etc...

EOQualifier q = new EOAndQualifier( new NSArray( new Object[] {
	new EOOrQualifier(new NSArray(new Object[] {
		new EOAndQualifier( itemsAQuals ),
		new EOAndQualifier( itemsBQuals )
	} ) ),
	new EOAndQualifier( itemsCQuals )
} ) );

That will work in memory, but EOQualifier.QualifierOperatorContains won't generate correct SQL for most databases. Do you use one that this works on?

Chuck


--

Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects





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--

Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects





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Do not post admin requests to the list. They will be ignored.
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References: 


 >many-to-many query question (From: James Cicenia <email@hidden>)


 >Re: many-to-many query question (From: Lachlan Deck <email@hidden>)


 >Re: many-to-many query question (From: Chuck Hill <email@hidden>)


 >Re: many-to-many query question (From: James Cicenia <email@hidden>)


 >Re: many-to-many query question (From: Chuck Hill <email@hidden>)


 >Re: many-to-many query question (From: James Cicenia <email@hidden>)























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