import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;public class TestTbl {    public static void main(String[] args) throws Exception {        Connection tXdConn = Conn.getTXdConn();        String sql1 = "select * from tbl ";                PreparedStatement statement = tXdConn.prepareStatement(sql1);        ResultSet resultSet = statement.executeQuery();        while(resultSet.next()){            String content1 = resultSet.getString("content1");            if(content1.equals("b")){                String sql2 = "update tbl set content1 = ‘c‘";                PreparedStatement statement2 = tXdConn.prepareStatement(sql2);                statement2.executeUpdate();                statement2.close();                String string = resultSet.getString("content1");                                System.out.println("update:" + string);            }            System.out.println(content1);        }        resultSet.close();        statement.close();        tXdConn.close();    }}