FW: [Springframework-developer] JdbcTemplate.doWithResultSetFromS taticQuery cleanups

[Kopylenko, D. <dko...@ac...>]

To the list...

-----Original Message-----
From: Levkovitch, Lidia 
Sent: Wednesday, August 13, 2003 1:12 PM
To: Kopylenko, Dmitry
Subject: RE: [Springframework-developer] JdbcTemplate.doWithResultSetFromS
taticQuery cleanups


Well, IMHO, one can't rely on that. I believe I've seen instances when a
connection was closed, leaving behind open cursors (i.e. result sets).

I would add rs.close() and s.close() to the finally block, and put each of
them into try {} catch (everything) {//do nothing...}

Lidia

-----Original Message-----
From: Kopylenko, Dmitry [mailto:dko...@ac...] 
Sent: Wednesday, August 13, 2003 12:51 PM
To: 'Justinus Menzel'; 'springframework-developer'
Subject: RE: [Springframework-developer] JdbcTemplate.doWithResultSetFromS
taticQuery cleanups

Would closing connection automatically take care of closing Statement and
ResultSet? I guess it all depends on the JDBC driver.

Dmitriy.

-----Original Message-----
From: Justinus Menzel [mailto:jus...@lb...] 
Sent: Wednesday, August 13, 2003 12:09 PM
To: springframework-developer
Subject: [Springframework-developer]
JdbcTemplate.doWithResultSetFromStaticQuery cleanups


Hi,

first let me tell you that Spring is great, you guys rock!

Now to the question: if you look into 
JdbcTemplate.doWithResultSetFromStaticQuery():
...
        try {
            con = DataSourceUtils.getConnection(this.dataSource);
            s = con.createStatement();
            rs = s.executeQuery(sql);

            if (logger.isInfoEnabled())
                logger.info("Executing static SQL query '" + sql + "' 
using a java.sql.Statement");

            rse.extractData(rs);

            SQLWarning warning = s.getWarnings();
            rs.close();
            s.close();

            throwExceptionOnWarningIfNotIgnoringWarnings(warning);
        }
        catch (SQLException ex) {
            throw 
getExceptionTranslater().translate("JdbcTemplate.query(sql)", sql, ex);
        }
        finally {
            DataSourceUtils.closeConnectionIfNecessary(con, 
this.dataSource);
        }
...

it seems like rs.close() and s.close() will be executed only if there 
was no exception thrown from
rse.extractData(). s.close will only be executed if  rs = 
s.executeQuery(sql); did OK.
So my question is: why don't both close() go into the finally block? The
reason why I'm asking this is that we had a few problems with 
running out of cursors
in our application server and we also had a few
examples of queries not working correctly with certain input parameters.

any comments are much appreciated
thanks

Justinus



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