Hmmm... I didn't know PostgreSQL had a facility for query logging and debugging of parameters to a logfile. Thought I had to execute a describe or something like that. Thanks, I'll try it to see what's happening!
2017-02-10 16:57 GMT-05:00 Adrian Klaver <adrian.klaver@xxxxxxxxxxx>:
On 02/10/2017 01:51 PM, Roberto Balarezo wrote:
Hi,
The parameter defaultDueDate is a java.sql.Date object, an actual Date.
When I run the query with the value in it, it works:
```sql
db=> select COALESCE(duedate, date '2017-02-01' + 1) from invoices order
by duedate desc;
coalesce
---------------------
2017-02-02 00:00:00
2017-02-02 00:00:00
2016-11-14 00:00:00
2017-02-10 00:00:00
2017-02-02 00:00:00
2017-02-13 00:00:00
2017-02-02 00:00:00
2017-02-02 00:00:00
```
But when I send it as a parameter, it ignores it and seems to think the
_expression_ is of type interger.
Which would indicate to me that is what is being passed in the parameter. If I would guess, from information here:
https://docs.oracle.com/javase/7/docs/api/java/sql/Date.html
milliseconds since January 1, 1970 00:00:00.000 GMT.
Turn on/up logging in Postgres and run a query with that java.sql.Date object. I am betting that what you will see in the logs is an integer.
2017-02-10 16:32 GMT-05:00 Adrian Klaver <adrian.klaver@xxxxxxxxxxx
<mailto:adrian.klaver@aklaver.com >>:adrian.klaver@xxxxxxxxxxx <mailto:adrian.klaver@aklaver.
On 02/10/2017 07:17 AM, Roberto Balarezo wrote:
Hi, I would like to know why this is happening and some advice
if there
is a way to solve this problem:
I have a query like this:
|select COALESCE(duedate, ? + 1) from invoices order by duedate desc
limit 10; |
What is the 1 in ? + 1 supposed to represent?
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 |
So what is the actual value of defaultDueDate?
Looks like it is an integer from the ERROR message.
Might want to look in the Postgres logs to see if they show anything
that might help.
Why is it inferring that the type is integer, when I send it as
Date??
I don't use Java, but I did find the below, don't know if it helps?:
https://jdbc.postgresql.org/documentation/94/escapes-datetim e.html
<https://jdbc.postgresql.org/documentation/94/escapes-dateti >me.html
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!
--
Adrian Klavercom >
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
