Re: [JDBC] Out of memory error on huge resultset

This code work for me :
Connection db = DriverManager.getConnection(url,user,passwd);
PreparedStatement st = db.prepareStatement("begin;declare c1 cursor for
select * from a");
st.execute();
st = db.prepareStatement("fetch 100 in c1");
ResultSet rs = st.executeQuery();
//rs.setFetchSize(100);
while (rs.next() ) {
s = rs.getString(1);
System.out.println(s);
}
st = db.prepareStatement("commit");
st.execute();
st.close();
db.close();

regards
Haris Peco
On Wednesday 16 October 2002 01:55 pm, Dave Tenny wrote:
> > > > > To work
> > > > > around this you can use explicit cursors (see the DECLARE CURSOR,
> > > > > FETCH, and MOVE sql commands for postgres).
>
> I'm unable to get this to work using the default distribution JDBC driver.
> (7.2). Here's a code snippet
>
> conn.setAutoCommit(false) ;
> stmt.execute("BEGIN") ;
> stmt.execute("DECLARE mysursor CURSOR FOR SELECT icol FROM mtable") ;
> ResultSet rs = null ;
> if (stmt.execute("FETCH 10000 IN mycursor"))
> rs = stmt.getResultSet() ;
>
> The FETCH statement returns an update count of 1, but no ResultSet.
> If I try executeQuery, a "no rows found" exception is thrown.
>
> Equivalent code in the C library interface works just fine.
>
> I need a workaround, because default ResultSet processing in the JDBC
> driver (and also the jxDBCon driver) pretty much blow out the memory
> of the JVM.
>
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