Re: Regression: Problems with Timestamp arguments

Hi,

if you try this: prepare foo as select $1 is null;
in psql you will get
ERROR: could not determine data type of parameter $1

Why it works with integers I don't know yet, but thought I would pass that
along

Dave Cramer

dave.cramer(at)credativ(dot)ca
http://www.credativ.ca

On Tue, Sep 10, 2013 at 5:17 AM, Lachezar Dobrev <l(dot)dobrev(at)gmail(dot)com> wrote:

> Hello colleagues,
>
> There seems to be a problem with the latest driver and Timestamp
> arguments uses in IS NULL comparisons:
> QUERY: SELECT ? IS NULL
> ARGUMENTS: statement.setTimestamp(1, new
> Timestamp(System.currentTimeMillis()))
>
> Result:
> Exception in thread "main" org.postgresql.util.PSQLException: ERROR:
> could not determine data type of parameter $1
> at
> org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2157)
> at
> org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1886)
> at
> org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
> at
> org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:555)
> at
> org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:417)
> at
> org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:302)
>
> The problem arises on:
> protocolVersion=3, or not specifying protocol version
> argument type: Timestamp
>
> The problem does not arise on other types (tested on BigDecimal and
> String)
> The problem does not arise when using protocolVersion=2
> The problem does not arise if the expression is not ? IS NULL
>
> List of work-around methods:
> - Degrade the protocol:
> jdbc:postgresql://host:port/database?protocolVersion=2
> * does not work with PgPool-2
>
> - Explicitly cast the argument
> SELECT ?::timestamp IS NULL
> SELECT CAST(? AS timestamp) IS NULL
> * requires rewriting of currently working code
>
> I believe this to be a bug.
>
>
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