oracle jdbc fetchsize取值对性能的影响

package com.gg.test;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class FetchSize {
    static final String driver_class  = "oracle.jdbc.driver.OracleDriver";
    static final String connectionURL = "jdbc:oracle:thin:@10.10.29.150:1522:ordb10";
    static final String userID        = "test";
    static final String userPassword  = "test";
    public void runTest(int fetchSize) {
        Connection  con = null;
        Statement   stmt = null;
        ResultSet   rset = null;
        long startTime =System.currentTimeMillis();
        String  query_string = "SELECT * FROM test";//test有5万条记录
        try {
            Class.forName (driver_class).newInstance();
            con = DriverManager.getConnection(connectionURL, userID, userPassword);
            stmt = con.createStatement();
            stmt.setFetchSize(fetchSize);
            rset = stmt.executeQuery (query_string);
            while (rset.next ()) {
                 rset.getString(1);
                 rset.getString(2);
                 rset.getString(3);
            }
            rset.close();
            stmt.close();
            long endTime =System.currentTimeMillis();
            System.out.println("fetchsize为"+fetchSize+"---消耗的时间:"+(endTime-startTime));
        }  catch (SQLException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        FetchSize fetchSize = new FetchSize();
        fetchSize.runTest(10);
        fetchSize.runTest(50);
        fetchSize.runTest(100);
        fetchSize.runTest(200);
        fetchSize.runTest(500);
        fetchSize.runTest(1000);
    }
}