SQL游标是否使用较少的内存？

Question

在此代码中：

public static void viewTable(Connection con, String dbName)
    throws SQLException {

    Statement stmt = null;
    String query =
        "select COF_NAME, SUP_ID, PRICE, " +
        "SALES, TOTAL " +
        "from " + dbName + ".COFFEES";

    try {
        stmt = con.createStatement();
        ResultSet rs = stmt.executeQuery(query);
        while (rs.next()) {
            String coffeeName = rs.getString("COF_NAME");
            int supplierID = rs.getInt("SUP_ID");
            float price = rs.getFloat("PRICE");
            int sales = rs.getInt("SALES");
            int total = rs.getInt("TOTAL");
            System.out.println(coffeeName + "\t" + supplierID +
                               "\t" + price + "\t" + sales +
                               "\t" + total);
        }
    } catch (SQLException e ) {
        JDBCTutorialUtilities.printSQLException(e);
    } finally {
        if (stmt != null) { stmt.close(); }
    }
}

特别是这段代码：

ResultSet rs = stmt.executeQuery(query);

此语句是否将所有行检索到ResultSet，或部分检索？我需要在Hibernate中加载一个包含500万行的表，并且有一个OutofMemory错误。它失败了：

List<Term> terms = em.createQuery(criteria).getResultList();

我需要在Mysql＆amp;中找到一种方法。 Hibernate加载此表时出现内存问题。感谢。