Re: Put SQL statement into a method

From:
 ram00540@gmail.com
Newsgroups:
comp.lang.java.programmer
Date:
Mon, 15 Oct 2007 11:33:32 -0000
Message-ID:
<1192448012.829725.108240@t8g2000prg.googlegroups.com>
On Oct 12, 5:12 am, Lew <l...@lewscanon.com> wrote:

Arne Vajh=F8j wrote:

tes...@hotmail.com wrote:

I have a repeated resultset object that I use alot to execute a
statement that fetches max id from a table.

I was wondering if I can put it in a method and call the method each
time I need the max id?

The repeated part is:
Resultset rs = statement.executeQuery("select max(id) from
TableMain");
rs.next();


I know I have mentioned repeatedly in answer to this question as you have
reposted it, and others have too, that you absolutely must check the retu=

rn

value of rs.next().

If you don't value our advice, why do you request it?

--
Lew


hi you can create the function is as below.
public static int getMax(String column, String table) {
        PreparedStatement st = null;
        ResultSet rs = null;
        Connection con = null;

        int maxid = 0;
        try {
            con = DatabaseUtil.getConnection();
            String query = "select max(" + column + ") from " + table + ";";
            st = con.prepareStatement(query);
            rs = st.executeQuery();
            while (rs != null && rs.next()) {
                maxid = rs.getInt(1);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (rs != null)
                    rs.close();

                if (st != null)
                    st.close();
                if (con != null)
                    con.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return maxid;
    }

}
and call every time you have required.

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