简单连接数据库的重要语句

 private static final String driver = "oracle.jdbc.driver.OracleDriver";
 private static final String url = "jdbc:oracle:thin:@10.10.12.92:1521:orcl";
 private static final String userName = "ubas";
 private static final String password = "ubas";
 Connection conn = null;
  PreparedStatement pstmt = null;
  ResultSet rs = null;
  String sql = "select * from ...";
        try{
  conn = getConn();
  pstmt = conn.prepareStatement(sql);
  rs = pstmt.executeQuery();
  while (rs.next()) {
   id = rs.getString("id"); 
   start = rs.getString("req_start_date");
     
  }
  
  String updatesql = "update uba_user_behavior set req_end_date=to_date('"
    + end_date
    + "','yyyy-mm-dd hh24:mi:ss'),time_length='"
    + jg_date
    + "' where id='" + id + "'";
  System.out.println(updatesql);
  pstmt = conn.prepareStatement(updatesql);
  }
        }catch(Exception e){
         e.printStackTrace();
        }finally{
         closeAll(conn,pstmt,rs);
        }