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From "Todd Wilkinson" ...@dealsqueal.com>
Subject RE: Problem iterating over a list of beans
Date Wed, 09 Jul 2008 13:56:11 GMT
Hi-
Thanks for the tip.  I tried that and it didn't work.
The only way I was able to get this to work was to wrap it in a class that
had a property that was a list.  Seems kind of kludgey - but it works
nonetheless.

> I'm certainly not an expert at this, but what if instead of passing the
> list
> right into the query, you created a map and put the list into the map with
> the key "conditions" (then pass the map into the query).
>
> Then, put something like this in the mapping:
>
> <iterate property="conditions" conjunction="and">
> 	$conditions[].condition$ $conditions[].operator$ #[].value#
> </iterate>
>
> That is usually how I iterate over stuff.  Not sure if I am understanding
> entirely what is going on with your situation, though...
>
> Chris
>
> -----Original Message-----
> From: Todd Wilkinson [mailto:lp@dealsqueal.com]
> Sent: Tuesday, July 08, 2008 3:53 PM
> To: user-java@ibatis.apache.org
> Subject: Problem iterating over a list of beans
>
>
> Hello-
> I'm new to iBATIS and I'm having trouble with the <iterate> element.
>
> I want to create a query for an entirely dynamic where clause.  I've
> constructed a Bean called QueryCondition with the following properties:
>
> String condition
> String operator
> String value
>
> (along with public accessors and mutators)
>
> I'm passing an ArrayList into the following mapping:
>
>   <select id="myObject.dynamicQuery" resultMap="myObject_resultmap"
> resultClass="java.util.List">
>     select id, name, data, notes
>     from objectTable
>     <dynamic prepend="where">
> 		<iterate conjunction="and">
> 			$[].condition$ $[].operator$ #[].value#
> 		</iterate>
> 	</dynamic>
>   </select>
>
> But it's not working.  In the logs, I see the following:
> Preparing Statement:      select id, name, source_code_location, context,
> notes     from objectTable where       my.package.QueryCondition@1f5b4d1
> my.package.QueryCondition@1f5b4d1 ?
>
> and then I get a logged exception:
> 0com.ibatis.common.jdbc.exception.NestedSQLException:
> --- The error occurred while applying a parameter map.
> --- Check the sites.dynamicQuery-InlineParameterMap.
> --- Check the parameter mapping for the '[0].value' property.
> --- Cause: java.lang.NullPointerException
> [full stack trace available if needed]
> The line 'check the parameter mapping...' will occur for whichever one of
> the properties a place in hashmarks, ie - #[].operator# will cause it
> also.
>
> I have verified that there is 1 QueryCondition object in this list which
> has its properties set.  Strange that the prepared statement resolves the
> first two properties to objects of type QueryCondition, instead of
> property string valyes.  I guess I'm not understanding how to properly
> access the objects in the list.  If I set a 'property' attribute in the
> <iterate> tag,  I get:
> --- The error occurred while preparing the mapped statement for execution.
> --- Check the myObject.dynamicQuery.
> --- Check the parameter map.
> --- Cause: com.ibatis.common.beans.ProbeException: Error getting ordinal
> list from JavaBean. Cause java.lang.StringIndexOutOfBoundsException:
> String index out of range: -1
>
> Thanks for any help!
>
> No virus found in this incoming message.
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> 6:33 AM
>
>



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