结果集是仅前进的。如果要导航回第一条记录，则需要创建 。
// Create a scrollable result set
Statement stmt = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
ResultSet resultSet = stmt.executeQuery("SELECT * FROM my_table");
// Move cursor forward
while (resultSet.next()) {
// Get data at cursor
String s = resultSet.getString(1);
}
// Move cursor backward
while (resultSet.prevIoUs()) {
// Get data at cursor
String s = resultSet.getString(1);
}
// Move cursor before first record
resultSet.beforeFirst(); //required statement in this case
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