Well, it's trying to convert your returned sequence result into an
EdiProfile object. Is that compatible? It might make more sense to
read the sequence as a data row -- setFetchingDataRows(true);
Here's code I used to fetch a sequence number (from an old Cayenne 2.0
project, so some things may be a little different now):
private Integer fetchDocumentNumberAutoIncrement() {
String defaultSql = "SELECT #result('max(DOCUMENT_NUMBER)+1'
'long' 'ID') FROM ENG_WORK_MGMT.AUTHORIZATION_DOCUMENT";
String oracleSql = "SELECT
#result('SEQ_AuthDocDocumentNumber.NextVal' 'long' 'ID') FROM DUAL";
SQLTemplate rawSelect = new SQLTemplate(getClass(), defaultSql);
rawSelect.setTemplate(OracleAdapter.class.getName(), oracleSql);
rawSelect.setTemplate(Oracle11Adapter.class.getName(), oracleSql);
rawSelect.setFetchingDataRows(true);
List list = getDataContext().performQuery(rawSelect);
Map row = (Map)list.get(0);
Number autoincrementID = (Number)row.get("ID");
return new Integer(autoincrementID.intValue());
}
On Wed, Jan 8, 2014 at 2:45 PM, Rick Bonnett <[email protected]> wrote:
> I’m trying to directly fetch the nextval form a postgres sequence using
> Cayenne, and am baffled but why I am getting nothing back.
>
> I’m using SqlTemplate to build my query, since the modeler does;t seem to let
> me model a sequence DB object directly.
>
> Code snippets:
>
> 1) using performQuery
> SQLTemplate query = new SQLTemplate(EdiProfile.class,"select
> nextval('live.edi_control_number_sequence') as seqNum");
> List response = ORMContext.performQuery(query);
>
> 2) using performGenericQuery
>
> SQLTemplate query = new SQLTemplate(EdiProfile.class,"select
> nextval('live.edi_control_number_sequence') as seqNum");
> QueryResponse response = ORMContext.performGenericQuery(query);
>
> In both cases I am getting back null from the query.
>
> Here’s what the log shows:
>
> INFO: Detected and installed adapter:
> org.apache.cayenne.dba.postgres.PostgresAdapter
> INFO: --- transaction started.
> INFO: select nextval('live.edi_control_number_sequence') as seqNum
> INFO: === returned 1 row. - took 10 ms.
> INFO: +++ transaction committed.
>
>
> And in fact if I go out and look in the postgres database, the sequence is
> getting hit and incremented.
>
> Is this something that just won;t work with Cayenne (in which case I suppose
> I’ll have to fall back to using JDBC directly).
>
> Thanks
>
