Re: DatabaseMetaData and Transactions - Mailing list pgsql-jdbc

From Tom Lane
Subject Re: DatabaseMetaData and Transactions
Date
Msg-id 26296.1118199561@sss.pgh.pa.us
Whole thread Raw
In response to Re: DatabaseMetaData and Transactions  (Oliver Jowett <oliver@opencloud.com>)
Responses Re: DatabaseMetaData and Transactions
List pgsql-jdbc
Oliver Jowett <oliver@opencloud.com> writes:
> You're going to have to pass metadata down, or change your queries to
> explicitly cast the parameters in the SQL itself. The driver has exactly
> the same problem as your code does -- with the v3 protocol it needs to
> provide a type for the parameter, but if it's just provided as a string
> the only type it can assume is text..

Is there any chance of a win in passing the type across to the backend
as "unknown", and seeing if the backend can infer something reasonable?
For example given
    WHERE int4col = ?
it'd be reasonable to infer the type of the ? symbol as int4, and that
logic has been built into the backend since forever.

            regards, tom lane

pgsql-jdbc by date:

Previous
From: Oliver Jowett
Date:
Subject: Re: ResultSet.getObject return type for smallint
Next
From: Oliver Jowett
Date:
Subject: Re: DatabaseMetaData and Transactions