I have a query like this:
select COALESCE(duedate, ? + 1) from invoices order by duedate desc limit 10;
where ? is a query parameter. I’m using JDBC to connect to the database, and sending parameters like this:
query.setDate(1, defaultDueDate);
Where defaultDueDate is a java.sql.Date object. However, when I try to execute the query, I get this error:
org.postgresql.util.PSQLException: ERROR: COALESCE types timestamp without time zone and integer cannot be matched
Why is it inferring that the type is integer, when I send it as Date??
When I force the type using a cast, like this:
select COALESCE(duedate, CAST(? AS DATE) + 1) from invoices order by duedate desc limit 10;
I get this error:
org.postgresql.util.PSQLException: ERROR: could not determine data type of parameter $1
If I’m telling PostgreSQL that the parameter is going to be a Date, and send through the driver a Date, why it is having trouble determining the datatype of the parameter??
What can I do to make it work?
For reference, I’m using PostgreSQL 9.2.15 and JDBC driver 9.4.1207.jre6.
Thanks for your advice!
