OK. Got it! I removed the SQLResult and than cast the Objects to DataRow:
String sql = "SELECT a.author_id X, count(*) CNT FROM
`publication_authors` a WHERE a.`cid` != 0 and a.cid = 1234 group by
a.author_id ORDER BY a.`cid` ASC";
SQLTemplate query = new
SQLTemplate(PublicationAuthors.class, sql);
query.setFetchingDataRows(true);
List objects = context.performQuery(query);
for(Object o: objects){
DataRow dr = (DataRow) o;
System.out.println(dr.keySet() + "X:"+ dr.get("X") +"
CNT: "+dr.get("CNT"));
}
I thought it is necessary to use the SQLResult when the columns are
not exact as in the DB table. All the examples I found show it this
way. It was much easier than I though.
Thank you Andrus!
On 1 September 2011 15:05, Andrus Adamchik <[email protected]> wrote:
> Ah got it, the exception is in your code, not the Cayenne code.
>
> Your SQLResult defines the result as Object[], so this is what you are
> getting here. You can either keep casting to Map and remove the SQLResult
> code. Or keep using SQLResult and cast to Object[]
>
> Andrus
>
> On Sep 1, 2011, at 9:40 AM, Sylwia Bugla wrote:
>
>> The exception stack is nothing more then:
>> Exception in thread "main" java.lang.ClassCastException:
>> [Ljava.lang.Object; cannot be cast to java.util.Map
>> on the line:
>> Map dr = (Map) o;
>>
>> I thought that if the SQLTemplate is setted to a Persistent object
>> (PublicationAuthors.class in this case) than the result is going to be
>> a List of this Persistent objects. In this case it returns Object and
>> I can not cast it to anything else. After adding the two column
>> results (X and CNT) as a SQLResult it just doesn't work any more.
>> I don' t know now how can I get the results of the two extra columns X and
>> CNT?
>>
>> Thank you.
>>
>> On 1 September 2011 13:37, Andrus Adamchik <[email protected]> wrote:
>>> Could you please post the exception stack trace?
>>>
>>> On Sep 1, 2011, at 1:58 AM, Sylwia Bugla wrote:
>>>
>>>> Hello everyone.
>>>> I am getting desperate about this issue. I have a simple piece of code
>>>> whose purpose is to make some counts in the database. It goes like
>>>> this:
>>>>
>>>> String sql = "SELECT a.author_id X, count(*) CNT FROM
>>>> `publication_authors` a WHERE a.`cid` != 0 and a.cid = 1234 group by
>>>> a.author_id ORDER BY a.`cid` ASC";
>>>>
>>>> SQLTemplate query = new
>>>> SQLTemplate(PublicationAuthors.class, sql);
>>>> query.setFetchingDataRows(true);
>>>>
>>>> SQLResult resultDescriptor = new SQLResult();
>>>> resultDescriptor.addColumnResult("X");
>>>> resultDescriptor.addColumnResult("CNT");
>>>> query.setResult(resultDescriptor);
>>>>
>>>> List objects = context.performQuery(query);
>>>>
>>>> for(Object o: objects){
>>>> Map dr = (Map) o; //tried with PublicationAuthors,
>>>> DataMap => always getting an exeption here "ClassCastException"
>>>> System.out.println(dr.keySet());
>>>> }
>>>>
>>>> Could someone explain me what am I doing wrong in here?
>>>> Thanks
>>>> Sylwia
>>>>
>>>
>>>
>>
>
>
